Slab corruption in floppy driver module

Hello,

Got a spew of slab corruption messages during boot on 3.2 vanilla kernel with DEBUG_SLAB enabled.

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[    9.643858] pciehp: PCI Express Hot Plug Controller Driver version: 0.4
[   10.792691] Slab corruption: blkdev_queue start=ffff88042407e088, len=2104
[   10.799280] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
[   10.805825] Last user: [<ffffffff812c6580>](kobject_cleanup+0x80/0x1d0)
[   10.812404] 4e0: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
jkkkkkkkkkkkkkkk
[   10.818984] Single bit error detected. Probably bad RAM.
[   10.825554] Run memtest86+ or a similar memory test tool.
[   10.832125] Next obj: start=ffff88042407e8d8, len=2104
[   10.838656] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
[   10.845168] Last user: [<          (null)>](0x0)
[   10.851646] 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
[   10.858222] 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
[   10.865320] loop: module loaded
[   10.896232] kjournald starting.  Commit interval 5 seconds
[   10.896368] EXT3-fs (sda5): using internal journal
[   10.896373] EXT3-fs (sda5): mounted filesystem with ordered data mode
[   10.915290] kjournald starting.  Commit interval 5 seconds
[   10.915385] EXT3-fs (sda3): using internal journal
[   10.915388] EXT3-fs (sda3): mounted filesystem with ordered data mode
[   12.361444] fuse init (API version 7.17)
[   15.776067] Slab corruption: blkdev_queue start=ffff880424d72148, len=2104
[   15.776074] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
[   15.776076] Last user: [<ffffffff812c6580>](kobject_cleanup+0x80/0x1d0)
[   15.776087] 4e0: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
jkkkkkkkkkkkkkkk
[   15.776092] Single bit error detected. Probably bad RAM.
[   15.776095] Run memtest86+ or a similar memory test tool.
[   15.776100] Next obj: start=ffff880424d72998, len=2104
[   15.776103] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
[   15.776106] Last user: [<ffffffff812c6580>](kobject_cleanup+0x80/0x1d0)
[   15.776111] 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
[   15.776116] 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
[   15.776122] Slab corruption: blkdev_queue start=ffff880424d72998, len=2104
[   15.776126] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
[   15.776128] Last user: [<ffffffff812c6580>](kobject_cleanup+0x80/0x1d0)
[   15.776133] 4e0: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
jkkkkkkkkkkkkkkk
[   15.776137] Single bit error detected. Probably bad RAM.
[   15.776139] Run memtest86+ or a similar memory test tool.
[   15.776144] Prev obj: start=ffff880424d72148, len=2104
[   15.776146] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
[   15.776150] Last user: [<ffffffff812c6580>](kobject_cleanup+0x80/0x1d0)
[   15.776155] 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
[   15.776159] 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
[   15.776164] Next obj: start=ffff880424d731e8, len=2104
[   15.776168] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
[   15.776170] Last user: [<ffffffff812c6580>](kobject_cleanup+0x80/0x1d0)
[   15.776175] 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
[   15.776178] 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
[   15.776185] Slab corruption: blkdev_queue start=ffff880424d731e8, len=2104
[   15.776188] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
[   15.776190] Last user: [<ffffffff812c6580>](kobject_cleanup+0x80/0x1d0)
[   15.776195] 4e0: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
jkkkkkkkkkkkkkkk
[   15.776199] Single bit error detected. Probably bad RAM.
[   15.776202] Run memtest86+ or a similar memory test tool.
[   15.776206] Prev obj: start=ffff880424d72998, len=2104

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After enabling DEBUG_PAGEALLOC the box oopsed and I was able to see the problem.

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[   33.228029] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
[   33.228029] CPU 5
[   33.228029] Modules linked in: dcdbas i5k_amb bnx2 i5000_edac vhost_net

iTCO_wdt edac_core macvtap macvlan tun ses enclosure kvm_intel iTCO_vendor_support shpchp kvm pci_hotplug sg serio_raw sr_mod cdrom button rtc_cmos pcspkr floppy(+) usbhid hid radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core uhci_hcd ehci_hcd usbcore usb_common sd_mod crc_t10dif processor thermal_sys hwmon ext3 mbcache jbd ata_generic ata_piix libata megaraid_sas scsi_mod

[   33.228029] Supported: Yes
[   33.228029]
[   33.228029] Pid: 1161, comm: modprobe Tainted: G           N  3.2.0-1-debug
#2 Dell Inc. PowerEdge 2950/0H603H
[   33.228029] RIP: 0010:[<ffffffff81275371>]  [<ffffffff81275371>]
kobject_put+0x11/0x60
[   33.228029] RSP: 0018:ffff88041dd9bda8  EFLAGS: 00010286
[   33.228029] RAX: 0000000000000000 RBX: ffff88041d986c60 RCX:
ffff88043fd40000
[   33.228029] RDX: 000000000000e1ac RSI: 0000000000000286 RDI:
ffff88041d986c60
[   33.228029] RBP: ffff88041dd9bdb8 R08: 0000000000000000 R09:
0000000000000009
[   33.228029] R10: 0000000000000028 R11: 0000000000000000 R12:
ffff88041da9bc58
[   33.228029] R13: 0000000000000000 R14: 0000000000000008 R15:
00000000ffffffed
[   33.228029] FS:  00007f86dd2ba700(0000) GS:ffff88043fd40000(0000)
knlGS:0000000000000000
[   33.228029] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   33.228029] CR2: ffff88041d986c9c CR3: 0000000424796000 CR4:
00000000000006e0
[   33.228029] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[   33.228029] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[   33.228029] Process modprobe (pid: 1161, threadinfo ffff88041dd9a000, task
ffff88041d998680)
[   33.228029] Stack:
[   33.228029]  ffff88041da9bbf0 ffff88041da9bbf0 ffff88041dd9bdc8
ffffffff81243a15
[   33.372026]  ffff88041dd9bde8 ffffffff8124d4ff 0000000000000000
ffffffff81a794e0
[   33.372026]  ffff88041dd9be08 ffffffff8134f517 ffff88041dd9be28
ffff88041da9bc68
[   33.372026] Call Trace:
[   33.372026]  [<ffffffff81243a15>] blk_put_queue+0x15/0x20
[   33.372026]  [<ffffffff8124d4ff>] disk_release+0x8f/0xd0
[   33.372026]  [<ffffffff8134f517>] device_release+0x27/0xa0
[   33.372026]  [<ffffffff812754fd>] kobject_cleanup+0x6d/0x1b0
[   33.372026]  [<ffffffff8127564d>] kobject_release+0xd/0x10
[   33.372026]  [<ffffffff81276b17>] kref_put+0x37/0x70
[   33.372026]  [<ffffffff81275387>] kobject_put+0x27/0x60
[   33.372026]  [<ffffffff8124dbf7>] put_disk+0x17/0x20
[   33.372026]  [<ffffffffa00fa92c>] floppy_init+0x1c1/0x675 [floppy]
[   33.372026]  [<ffffffffa00fae37>] floppy_module_init+0x57/0x220 [floppy]
[   33.372026]  [<ffffffff810001d3>] do_one_initcall+0x43/0x180
[   33.372026]  [<ffffffff810a526d>] sys_init_module+0xcd/0x240
[   33.372026]  [<ffffffff8148d4c2>] system_call_fastpath+0x16/0x1b
[   33.372026]  [<00007f86dce3406a>] 0x7f86dce34069
[   33.372026] Code: eb cc 48 89 fe 31 c0 48 c7 c7 60 aa 7a 81 e8 26 c4 20 00
e8 92 c1 20 00 eb 8e 55 48 89 e5 53 48 89 fb 48 83 ec 08 48 85 ff 74 16 <f6> 47
3c 01 74 19 48 8d 7b 38 48 c7 c6 40 56 27 81 e8 59 17 00
[   33.372026] RIP  [<ffffffff81275371>] kobject_put+0x11/0x60
[   33.372026]  RSP <ffff88041dd9bda8>
[   33.372026] CR2: ffff88041d986c9c
[   33.372026] ---[ end trace f624c17dc6e4672a ]---

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What seems to be happening is after commit f992ae80, add_disk takes a extra reference to the queue which is supposed to be put in disk_release(). In floppy_init() when there were "no floppy controllers found" the control goes to out_flush_work. Note that add_disk() is not being called at all and so extra reference not taken. We try to put_disk() and the call sequence is
put_disk()
kobject_put()
kref_put()
kobject_release()
kobject_cleanup()
device_release()
disk_release()
blk_put_queue() <-- put without a get
kobject_put()

Reverting f992ae80 makes the oops and the slab corruption messages disappear. The "no floppy controllers found" message was found in the dmesg.

Thanks
Suresh

On Tue, Jan 24, 2012 at 06:49:37PM +0530, Suresh Jayaraman wrote:

[..]

I am wondering if extra queue reference for gendisk should be taken by driver and not by add_disk(). Why? Because disk->queue association is setup by driver and not by add_disk(). That way even if we don't call, add_disk(), we should be fine.

Thanks
Vivek

I also noticed this problem about two weeks ago
(https://lkml.org/lkml/2012/1/10/177) -- the mentioned commit 523e1d399c seems to be identical to f992ae80.

Perhaps, it is helpful to notice that I also played with this on a machine that _has_ a floppy controler and if the floppy driver is loaded as a module on boot, then unloaded and reloaded it also outputs error messages, i.e. re-loading the module also causes problems.

Thanks,

Dirk

For completeness, here are the messages produced by a module re-load.

Dirk

=============================================================================
BUG blkdev_queue (Tainted: P O): Poison overwritten
-----------------------------------------------------------------------------

INFO: 0xffff880075d99498-0xffff880075d99498. First byte 0x6a instead of 0x6b
INFO: Allocated in blk_alloc_queue_node+0x1e/0x1a2 age=39161720 cpu=1 pid=1671

	set_track+0x5e/0xd9
	alloc_debug_processing+0xbd/0x15e
	__slab_alloc+0x324/0x376
	blk_alloc_queue_node+0x1e/0x1a2
	prio_tree_insert+0x187/0x239
	blk_alloc_queue_node+0x1e/0x1a2
	kmem_cache_alloc_node+0x6b/0x132
	blk_alloc_queue_node+0x1e/0x1a2
	0xffffffffa001b25f
	blk_init_queue_node+0x1a/0x52
	alloc_disk_node+0xba/0xdd
	floppy_module_init+0x215/0xdc0 [floppy]
	tracepoint_module_notify+0xcd/0x15d
	notifier_call_chain+0x2e/0x5b
	floppy_module_init+0x0/0xdc0 [floppy]
	do_one_initcall+0x78/0x12b
INFO: Freed in kobject_release+0x48/0x5e age=3353 cpu=0 pid=24844
	set_track+0x5e/0xd9
	free_debug_processing+0x155/0x1ed
	__slab_free+0x2b/0x291
	prio_tree_remove+0xc0/0xd4
	kobject_release+0x48/0x5e
	kobject_release+0x48/0x5e
	kmem_cache_free+0x9b/0xd9
	kobject_release+0x48/0x5e
	0xffffffffa001d1de
	sys_delete_module+0x1cf/0x22c
	do_munmap+0x2cc/0x2e5
	system_call_fastpath+0x16/0x1b

INFO: Slab 0xffffea0001d76600 objects=15 used=15 fp=0x (null) flags=0x100000000004080
INFO: Object 0xffff880075d99070 @offset=4208 fp=0xffff880075d9ead8

Bytes b4 ffff880075d99060: b7 69 54 02 01 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a .iT.....ZZZZZZZZ Object ffff880075d99070: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99080: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99090: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d990a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d990b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d990c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d990d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d990e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d990f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99100: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99110: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99120: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99130: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99140: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99150: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99160: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99170: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99180: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99190: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d991a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d991b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d991c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d991d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d991e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d991f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99200: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99210: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99220: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99230: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99240: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99250: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99260: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99270: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99280: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99290: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d992a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d992b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d992c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d992d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d992e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d992f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99300: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99310: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99320: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99330: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99340: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99350: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99360: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99370: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99380: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99390: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d993a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d993b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d993c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d993d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d993e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d993f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99400: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99410: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99420: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99430: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99440: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99450: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99460: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99470: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99480: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99490: 6b 6b 6b 6b 6b 6b 6b 6b 6a 6b 6b 6b 6b 6b 6b 6b kkkkkkkkjkkkkkkk Object ffff880075d994a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d994b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d994c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d994d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d994e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d994f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99500: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99510: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99520: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99530: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99540: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99550: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99560: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99570: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99580: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99590: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d995a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d995b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d995c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d995d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d995e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d995f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99600: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99610: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99620: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99630: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99640: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99650: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99660: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99670: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99680: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99690: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d996a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d996b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d996c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d996d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d996e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d996f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99700: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99710: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99720: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99730: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99740: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880075d99750: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk.
Redzone ffff880075d99760: bb bb bb bb bb bb bb bb ........
Padding ffff880075d998a0: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
Pid: 24851, comm: modprobe Tainted: P O 3.2.0-07682-g211e53b #27

Call Trace:
 [<ffffffff810fcd49>] ? check_bytes_and_report+0xad/0xe6
 [<ffffffff810fce3d>] ? check_object+0xbb/0x1f7
 [<ffffffff812ba29b>] ? blk_alloc_queue_node+0x1e/0x1a2
 [<ffffffff810fe340>] ? alloc_debug_processing+0xa3/0x15e
 [<ffffffff810ff4aa>] ? __slab_alloc+0x324/0x376
 [<ffffffff812ba29b>] ? blk_alloc_queue_node+0x1e/0x1a2
 [<ffffffff812cccea>] ? prio_tree_insert+0x187/0x239
 [<ffffffff812ba29b>] ? blk_alloc_queue_node+0x1e/0x1a2
 [<ffffffff810ff85b>] ? kmem_cache_alloc_node+0x6b/0x132
 [<ffffffff812ba29b>] ? blk_alloc_queue_node+0x1e/0x1a2
 [<ffffffffa0c4f25f>] ? lock_fdc.clone.8+0xfd/0xfd [floppy]
 [<ffffffff812bb3ab>] ? blk_init_queue_node+0x1a/0x52
 [<ffffffff812c1a07>] ? alloc_disk_node+0xba/0xdd
 [<ffffffffa0026341>] ? floppy_module_init+0x215/0xdc0 [floppy]
 [<ffffffff810ad669>] ? tracepoint_module_notify+0xcd/0x15d
 [<ffffffff8154e9d7>] ? notifier_call_chain+0x2e/0x5b
 [<ffffffffa002612c>] ? daring+0x67/0x67 [floppy]
 [<ffffffff810002e5>] ? do_one_initcall+0x78/0x12b
 [<ffffffff8109228e>] ? sys_init_module+0x15e0/0x17c3
 [<ffffffff81551d62>] ? system_call_fastpath+0x16/0x1b

FIX blkdev_queue: Restoring 0xffff880075d99498-0xffff880075d99498=0x6b

FIX blkdev_queue: Marking all objects used
=============================================================================
BUG blkdev_queue (Tainted: P O): Poison overwritten
-----------------------------------------------------------------------------

INFO: 0xffff8800795b3db0-0xffff8800795b3db0. First byte 0x6a instead of 0x6b
INFO: Allocated in blk_alloc_queue_node+0x1e/0x1a2 age=39161721 cpu=1 pid=1671

	set_track+0x5e/0xd9
	alloc_debug_processing+0xbd/0x15e
	__slab_alloc+0x324/0x376
	blk_alloc_queue_node+0x1e/0x1a2
	prio_tree_insert+0x143/0x239
	blk_alloc_queue_node+0x1e/0x1a2
	kmem_cache_alloc_node+0x6b/0x132
	blk_alloc_queue_node+0x1e/0x1a2
	0xffffffffa001b25f
	blk_init_queue_node+0x1a/0x52
	alloc_disk_node+0xba/0xdd
	floppy_module_init+0x215/0xdc0 [floppy]
	tracepoint_module_notify+0xcd/0x15d
	notifier_call_chain+0x2e/0x5b
	floppy_module_init+0x0/0xdc0 [floppy]
	do_one_initcall+0x78/0x12b
INFO: Freed in kobject_release+0x48/0x5e age=3353 cpu=0 pid=24844
	set_track+0x5e/0xd9
	free_debug_processing+0x155/0x1ed
	__slab_free+0x2b/0x291
	prio_tree_remove+0xc0/0xd4
	kobject_release+0x48/0x5e
	kobject_release+0x48/0x5e
	kmem_cache_free+0x9b/0xd9
	kobject_release+0x48/0x5e
	0xffffffffa001d1de
	sys_delete_module+0x1cf/0x22c
	do_munmap+0x2cc/0x2e5
	system_call_fastpath+0x16/0x1b

INFO: Slab 0xffffea0001e56c00 objects=15 used=15 fp=0x (null) flags=0x100000000004080
INFO: Object 0xffff8800795b3988 @offset=14728 fp=0xffff8800795b41c0

Bytes b4 ffff8800795b3978: b7 69 54 02 01 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a .iT.....ZZZZZZZZ Object ffff8800795b3988: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3998: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b39a8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b39b8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b39c8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b39d8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b39e8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b39f8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3a08: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3a18: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3a28: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3a38: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3a48: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3a58: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3a68: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3a78: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3a88: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3a98: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3aa8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3ab8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3ac8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3ad8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3ae8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3af8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3b08: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3b18: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3b28: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3b38: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3b48: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3b58: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3b68: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3b78: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3b88: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3b98: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3ba8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3bb8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3bc8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3bd8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3be8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3bf8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3c08: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3c18: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3c28: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3c38: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3c48: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3c58: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3c68: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3c78: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3c88: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3c98: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3ca8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3cb8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3cc8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3cd8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3ce8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3cf8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3d08: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3d18: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3d28: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3d38: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3d48: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3d58: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3d68: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3d78: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3d88: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3d98: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3da8: 6b 6b 6b 6b 6b 6b 6b 6b 6a 6b 6b 6b 6b 6b 6b 6b kkkkkkkkjkkkkkkk Object ffff8800795b3db8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3dc8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3dd8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3de8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3df8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3e08: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3e18: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3e28: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3e38: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3e48: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3e58: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3e68: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3e78: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3e88: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3e98: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3ea8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3eb8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3ec8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3ed8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3ee8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3ef8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3f08: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3f18: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3f28: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3f38: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3f48: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3f58: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3f68: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3f78: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3f88: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3f98: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3fa8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3fb8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3fc8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3fd8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3fe8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b3ff8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b4008: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b4018: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b4028: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b4038: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b4048: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b4058: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8800795b4068: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk.
Redzone ffff8800795b4078: bb bb bb bb bb bb bb bb ........
Padding ffff8800795b41b8: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
Pid: 24851, comm: modprobe Tainted: P O 3.2.0-07682-g211e53b #27

Call Trace:
 [<ffffffff810fcd49>] ? check_bytes_and_report+0xad/0xe6
 [<ffffffff810fce3d>] ? check_object+0xbb/0x1f7
 [<ffffffff812ba29b>] ? blk_alloc_queue_node+0x1e/0x1a2
 [<ffffffff810fe340>] ? alloc_debug_processing+0xa3/0x15e
 [<ffffffff810ff4aa>] ? __slab_alloc+0x324/0x376
 [<ffffffff812ba29b>] ? blk_alloc_queue_node+0x1e/0x1a2
 [<ffffffff812cccea>] ? prio_tree_insert+0x187/0x239
 [<ffffffff812ba29b>] ? blk_alloc_queue_node+0x1e/0x1a2
 [<ffffffff810ff85b>] ? kmem_cache_alloc_node+0x6b/0x132
 [<ffffffff812ba29b>] ? blk_alloc_queue_node+0x1e/0x1a2
 [<ffffffffa0c4f25f>] ? lock_fdc.clone.8+0xfd/0xfd [floppy]
 [<ffffffff812bb3ab>] ? blk_init_queue_node+0x1a/0x52
 [<ffffffff812c1a07>] ? alloc_disk_node+0xba/0xdd
 [<ffffffffa0026341>] ? floppy_module_init+0x215/0xdc0 [floppy]
 [<ffffffff810ad669>] ? tracepoint_module_notify+0xcd/0x15d
 [<ffffffff8154e9d7>] ? notifier_call_chain+0x2e/0x5b
 [<ffffffffa002612c>] ? daring+0x67/0x67 [floppy]
 [<ffffffff810002e5>] ? do_one_initcall+0x78/0x12b
 [<ffffffff8109228e>] ? sys_init_module+0x15e0/0x17c3
 [<ffffffff81551d62>] ? system_call_fastpath+0x16/0x1b

FIX blkdev_queue: Restoring 0xffff8800795b3db0-0xffff8800795b3db0=0x6b

FIX blkdev_queue: Marking all objects used
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077

On Tue, Jan 24, 2012 at 05:31:53PM -0500, Vivek Goyal wrote:

[..]

Well, changing above assumption will require lots of drivers to be changed. So probably an easier fix would be to clear disk->queue before calling put_disk() if we never called add_disk().

Suresh, does following patch help?

Thanks
Vivek

floppy: Cleanup disk->queue before caling put_disk() if add_disk() was never called

add_disk() takes gendisk reference on request queue. If driver failed during initialization and never called add_disk() then that extra reference is not taken. That reference is put in put_disk(). floppy driver allocates the disk, allocates queue, sets disk->queue and then relizes that floppy controller is not present. It tries to tear down everything and tries to put a reference down in put_disk() which was never taken.

In such error cases cleanup disk->queue before calling put_disk() so that we never try to put down a reference which was never taken in first place.

---
 drivers/block/floppy.c |   15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/block/floppy.c
===================================================================
@@ -4368,8 +4368,21 @@ out_unreg_blkdev:
 out_put_disk:
 	while (dr--) {
 		del_timer_sync(&motor_off_timer[dr]);
-		if (disks[dr]->queue)
+		if (disks[dr]->queue) {
 			blk_cleanup_queue(disks[dr]->queue);
+			/*
+			 * The request queue reference we took at device
+			 * creation time has been put by above
+			 * blk_cleanup_queue(). We have not called add_disk()
+			 * yet and due to failure calling put_disk(). Put disk
+			 * will try to put a reference to disk->queue which is
+			 * taken in add_disk(). As we have not taken that
+			 * extra reference, putting extra reference down
+			 * will try to access already freed queue. Clear
+			 * disk->queue before calling put_disk().
+			 */
+			disks[dr]->queue = NULL;
+		}
 		put_disk(disks[dr]);
 	}
 	return err;

Hello,

tejun

I tested the patch on my machine without a floppy controller and it no longer produces traces, just "floppy0: no floppy controllers found"

Dirk

Sure. Toned down the comment as suggested. Here is the new patch.

floppy: Cleanup disk->queue before caling put_disk() if add_disk() was never called

add_disk() takes gendisk reference on request queue. If driver failed during initialization and never called add_disk() then that extra reference is not taken. That reference is put in put_disk(). floppy driver allocates the disk, allocates queue, sets disk->queue and then relizes that floppy controller is not present. It tries to tear down everything and tries to put a reference down in put_disk() which was never taken.

In such error cases cleanup disk->queue before calling put_disk() so that we never try to put down a reference which was never taken in first place.

---
 drivers/block/floppy.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/block/floppy.c
===================================================================
@@ -4368,8 +4368,14 @@ out_unreg_blkdev:
 out_put_disk:
 	while (dr--) {
 		del_timer_sync(&motor_off_timer[dr]);
-		if (disks[dr]->queue)
+		if (disks[dr]->queue) {
 			blk_cleanup_queue(disks[dr]->queue);
+			/*
+			 * put_disk() is not paired with add_disk() and
+			 * will put queue reference one extra time. fix it.
+			 */
+			disks[dr]->queue = NULL;
+		}
 		put_disk(disks[dr]);
 	}
 	return err;

Ok. Thanks for the update. I had assumed that it solved both the issues. So, module load/unload seems to be a different problem. We should still take this patch as it solves atleast the case of floppy controller not being present.

Jens, do you want me to post the patch in a separate mail thread?

Thanks
Vivek

Yeah, this seems like a different problem. Could you please try enabling CONFIG_DEBUG_PAGEALLOC and see whether is it pointing to the problem code while loading/unloading the module?

Suresh

[snipped many lines]

I enabled the option and it produces just one message during boot but nothing else while unloading/loading the floppy module.

Dirk

(This time tested with a VM)
------------------------------------------------------------------------
=============================================================================
BUG blkdev_queue (Not tainted): Poison overwritten
-----------------------------------------------------------------------------

INFO: 0xffff880036c414d0-0xffff880036c414d0. First byte 0x6a instead of 0x6b
INFO: Allocated in blk_alloc_queue_node+0x1e/0x1ed age=17519 cpu=0 pid=1560

	set_track+0x5e/0xd9
	alloc_debug_processing+0xbd/0x15e
	__slab_alloc+0x248/0x297
	blk_alloc_queue_node+0x1e/0x1ed
	prio_tree_insert+0xd4/0x184
	kmem_cache_alloc_node+0x77/0x153
	blk_alloc_queue_node+0x1e/0x1ed
	rand_initialize_disk+0x1f/0x34
	blk_alloc_queue_node+0x1e/0x1ed
	0xffffffffa006cfa8
	blk_init_queue_node+0x1a/0x52
	alloc_disk_node+0xba/0xdd
	0xffffffffa00786c7
	notifier_call_chain+0x2e/0x5b
	0xffffffffa0078c16
	do_one_initcall+0x78/0x12b
INFO: Freed in kobject_release+0x48/0x5e age=2743 cpu=1 pid=2415
	set_track+0x5e/0xd9
	free_debug_processing+0x155/0x1ed
	__slab_free+0x2b/0x291
	kobject_release+0x48/0x5e
	kobject_release+0x48/0x5e
	kmem_cache_free+0x9b/0xd9
	kobject_release+0x48/0x5e
	0xffffffffa006e5a2
	sys_delete_module+0x1cf/0x22c
	do_munmap+0x2cc/0x2e5
	system_call_fastpath+0x16/0x1b

INFO: Slab 0xffffea0000db1000 objects=15 used=15 fp=0x (null) flags=0x100000000004080
INFO: Object 0xffff880036c410a0 @offset=4256 fp=0xffff880036c46c10

Bytes b4 ffff880036c41090: 07 20 ff ff 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a . ......ZZZZZZZZ Object ffff880036c410a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c410b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c410c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c410d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c410e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c410f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41100: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41110: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41120: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41130: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41140: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41150: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41160: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41170: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41180: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41190: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c411a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c411b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c411c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c411d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c411e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c411f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41200: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41210: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41220: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41230: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41240: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41250: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41260: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41270: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41280: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41290: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c412a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c412b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c412c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c412d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c412e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c412f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41300: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41310: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41320: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41330: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41340: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41350: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41360: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41370: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41380: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41390: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c413a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c413b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c413c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c413d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c413e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c413f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41400: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41410: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41420: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41430: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41440: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41450: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41460: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41470: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41480: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41490: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c414a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c414b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c414c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c414d0: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b jkkkkkkkkkkkkkkk Object ffff880036c414e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c414f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41500: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41510: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41520: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41530: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41540: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41550: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41560: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41570: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41580: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41590: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c415a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c415b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c415c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c415d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c415e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c415f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41600: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41610: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41620: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41630: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41640: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41650: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41660: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41670: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41680: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41690: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c416a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c416b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c416c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c416d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c416e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c416f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41700: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41710: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41720: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41730: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41740: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41750: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41760: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41770: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41780: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880036c41790: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880036c417a0: 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkk.
Redzone ffff880036c417a8: bb bb bb bb bb bb bb bb ........
Padding ffff880036c418e8: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
Pid: 2417, comm: modprobe Not tainted 3.3.0-rc1-00060-gc1aab02-dirty #26

Call Trace:
 [<ffffffff810ffe05>] ? check_bytes_and_report+0xad/0xe6
 [<ffffffff810ffef9>] ? check_object+0xbb/0x1f7
 [<ffffffff812bfc5f>] ? blk_alloc_queue_node+0x1e/0x1ed
 [<ffffffff81101753>] ? alloc_debug_processing+0xa3/0x15e
 [<ffffffff811027a4>] ? __slab_alloc+0x248/0x297
 [<ffffffff812bfc5f>] ? blk_alloc_queue_node+0x1e/0x1ed
 [<ffffffff812d2db1>] ? prio_tree_insert+0xd4/0x184
 [<ffffffff81102b95>] ? kmem_cache_alloc_node+0x77/0x153
 [<ffffffff812bfc5f>] ? blk_alloc_queue_node+0x1e/0x1ed
 [<ffffffff8134d9e6>] ? rand_initialize_disk+0x1f/0x34
 [<ffffffff812bfc5f>] ? blk_alloc_queue_node+0x1e/0x1ed
 [<ffffffffa0082fa8>] ? lock_fdc.clone.8+0xfd/0xfd [floppy]
 [<ffffffff812c0f97>] ? blk_init_queue_node+0x1a/0x52
 [<ffffffff812c7cd2>] ? alloc_disk_node+0xba/0xdd
 [<ffffffffa008e6c7>] ? floppy_init+0x78/0x5c7 [floppy]
 [<ffffffff8155ac85>] ? notifier_call_chain+0x2e/0x5b
 [<ffffffffa008ec16>] ? floppy_init+0x5c7/0x5c7 [floppy]
 [<ffffffff810002e5>] ? do_one_initcall+0x78/0x12b
 [<ffffffff8109a8b7>] ? sys_init_module+0x80/0x1c5
 [<ffffffff8155e222>] ? system_call_fastpath+0x16/0x1b

FIX blkdev_queue: Restoring 0xffff880036c414d0-0xffff880036c414d0=0x6b

FIX blkdev_queue: Marking all objects used
=============================================================================
BUG blkdev_queue (Not tainted): Poison overwritten
-----------------------------------------------------------------------------

INFO: 0xffff88003ae7be60-0xffff88003ae7be60. First byte 0x6a instead of 0x6b
INFO: Allocated in blk_alloc_queue_node+0x1e/0x1ed age=17519 cpu=0 pid=1560

	set_track+0x5e/0xd9
	alloc_debug_processing+0xbd/0x15e
	__slab_alloc+0x248/0x297
	blk_alloc_queue_node+0x1e/0x1ed
	prio_tree_insert+0x90/0x184
	kmem_cache_alloc_node+0x77/0x153
	blk_alloc_queue_node+0x1e/0x1ed
	rand_initialize_disk+0x1f/0x34
	blk_alloc_queue_node+0x1e/0x1ed
	0xffffffffa006cfa8
	blk_init_queue_node+0x1a/0x52
	alloc_disk_node+0xba/0xdd
	0xffffffffa00786c7
	notifier_call_chain+0x2e/0x5b
	0xffffffffa0078c16
	do_one_initcall+0x78/0x12b
INFO: Freed in kobject_release+0x48/0x5e age=2744 cpu=1 pid=2415
	set_track+0x5e/0xd9
	free_debug_processing+0x155/0x1ed
	__slab_free+0x2b/0x291
	prio_tree_remove+0xc0/0xd4
	kobject_release+0x48/0x5e
	kobject_release+0x48/0x5e
	kmem_cache_free+0x9b/0xd9
	kobject_release+0x48/0x5e
	0xffffffffa006e5a2
	sys_delete_module+0x1cf/0x22c
	do_munmap+0x2cc/0x2e5
	system_call_fastpath+0x16/0x1b

INFO: Slab 0xffffea0000eb9e00 objects=15 used=15 fp=0x (null) flags=0x100000000004080
INFO: Object 0xffff88003ae7ba30 @offset=14896 fp=0xffff88003ae7c280

Bytes b4 ffff88003ae7ba20: 07 20 ff ff 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a . ......ZZZZZZZZ Object ffff88003ae7ba30: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7ba40: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7ba50: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7ba60: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7ba70: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7ba80: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7ba90: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7baa0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7bab0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7bac0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7bad0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7bae0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7baf0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7bb00: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7bb10: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7bb20: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7bb30: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7bb40: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7bb50: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7bb60: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff88003ae7bb70: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object 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Object ffff88003ae7c130: 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkk.
Redzone ffff88003ae7c138: bb bb bb bb bb bb bb bb ........
Padding ffff88003ae7c278: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
Pid: 2417, comm: modprobe Not tainted 3.3.0-rc1-00060-gc1aab02-dirty #26

Call Trace:
 [<ffffffff810ffe05>] ? check_bytes_and_report+0xad/0xe6
 [<ffffffff810ffef9>] ? check_object+0xbb/0x1f7
 [<ffffffff812bfc5f>] ? blk_alloc_queue_node+0x1e/0x1ed
 [<ffffffff81101753>] ? alloc_debug_processing+0xa3/0x15e
 [<ffffffff811027a4>] ? __slab_alloc+0x248/0x297
 [<ffffffff812bfc5f>] ? blk_alloc_queue_node+0x1e/0x1ed
 [<ffffffff812d2db1>] ? prio_tree_insert+0xd4/0x184
 [<ffffffff81102b95>] ? kmem_cache_alloc_node+0x77/0x153
 [<ffffffff812bfc5f>] ? blk_alloc_queue_node+0x1e/0x1ed
 [<ffffffff8134d9e6>] ? rand_initialize_disk+0x1f/0x34
 [<ffffffff812bfc5f>] ? blk_alloc_queue_node+0x1e/0x1ed
 [<ffffffffa0082fa8>] ? lock_fdc.clone.8+0xfd/0xfd [floppy]
 [<ffffffff812c0f97>] ? blk_init_queue_node+0x1a/0x52
 [<ffffffff812c7cd2>] ? alloc_disk_node+0xba/0xdd
 [<ffffffffa008e6c7>] ? floppy_init+0x78/0x5c7 [floppy]
 [<ffffffff8155ac85>] ? notifier_call_chain+0x2e/0x5b
 [<ffffffffa008ec16>] ? floppy_init+0x5c7/0x5c7 [floppy]
 [<ffffffff810002e5>] ? do_one_initcall+0x78/0x12b
 [<ffffffff8109a8b7>] ? sys_init_module+0x80/0x1c5
 [<ffffffff8155e222>] ? system_call_fastpath+0x16/0x1b

FIX blkdev_queue: Restoring 0xffff88003ae7be60-0xffff88003ae7be60=0x6b

FIX blkdev_queue: Marking all objects used
FDC 0 is a S82078B

Can you please try following patch and see if it fixes the issue. I could reproduce the issue with my virtual machine. The issue seems to be that we do not call add_disk() for all the drives/disks but we try to do put_disk() on all the disks. Hence running into the issue of putting extra reference during module removal.

floppy: Fix a crash during rmmmod

floppy driver does not call add_disk() on all the drives hence we don't take gendisk reference on request queue for these drives. Don't call put_disk() with disk->queue set, otherwise we try to put the reference we never took.

---
 drivers/block/floppy.c |    9 +++++++++
 1 file changed, 9 insertions(+)

Index: linux-2.6/drivers/block/floppy.c
===================================================================
@@ -4584,6 +4584,15 @@ static void __exit floppy_module_exit(vo
 			platform_device_unregister(&floppy_device[drive]);
 		}
 		blk_cleanup_queue(disks[drive]->queue);
+
+		/*
+		 * These disks have not called add_disk().  Don't put down
+		 * queue reference in put_disk().
+		 */
+		if (!(allowed_drive_mask & (1 << drive)) ||
+		    fdc_state[FDC(drive)].version == FDC_NONE)
+			disks[drive]->queue = NULL;
+
 		put_disk(disks[drive]);
 	}
 

I tested your patch and it works fine.

There is just a little typo:

floppy: Fix a crash during rmmod

Thanks,

Dirk

Ugh... floppy init is ugly. Thanks for fixing this.

Jens, this one and the previous one are regression fixes and need to be routed through v3.3-fixes.

tejun

Looks like it needs to be marked for -stable as well as the commit f992ae8 which exposed these problems was originally marked for -stable?

Suresh