EXT4: kernel BUG at fs/jbd2/commit.c:533!

While executing fsstress against ext4 with 2.6.31-rc8 on a powerpc box, ran into the following Bug.

------------[ cut here ]------------
cpu 0x0: Vector: 700 (Program Check) at [c0000000f3ae3970]
   pc: c000000000280f28: .jbd2_journal_commit_transaction+0x8ac/0x1bfc
   lr: c000000000280e58: .jbd2_journal_commit_transaction+0x7dc/0x1bfc
   sp: c0000000f3ae3bf0
  msr: 8000000000029032
 current = 0xc0000000f315c7d0
 paca    = 0xc000000000b62600
   pid   = 23139, comm = kjournald2

kernel BUG at fs/jbd2/commit.c:533!
enter ? for help
[c0000000f3ae3dd0] c000000000289c60 .kjournald2+0x198/0x46c [c0000000f3ae3ed0] c0000000000a86a0 .kthread+0xac/0xb8 [c0000000f3ae3f90] c00000000002ab3c .kernel_thread+0x54/0x70 0:mon>

Ext4 FS was created and mounted using :

/usr/local/e2fsprogs/sbin/mkfs.ext4 -b 4096 /dev/sda4 mount -t ext4 -o errors=panic,data=journal /dev/sda4 /mnt/tmp/

Register information from xmon debugger :
0:mon> r

R00 = 0000000000000001   R16 = c0000000334e0160
R01 = c0000000f3ae3bf0   R17 = 0000000000000000
R02 = c000000000a6f1e8   R18 = 0000000000000000
R03 = c0000000e87c9024   R19 = 0000000000000001
R04 = c0000000334e0100   R20 = 0000000000000001
R05 = 0000000000000409   R21 = 0000000000000409
R06 = 0000000000000000   R22 = c0000000f3ae3c78
R07 = c0000000f315c7d0   R23 = 0000000000000000
R08 = c000000000b62600   R24 = c0000000e87c9000
R09 = 00000000000000a0   R25 = c0000000334e0170
R10 = c0000000f3ae0080   R26 = c0000000334e0100
R11 = 0000000100051657   R27 = c0000000334e0150
R12 = 0000000024000088   R28 = c0000000f3ae3c78
R13 = c000000000b62600   R29 = c0000000f315c7d0
R14 = c0000000008325c8   R30 = c0000000009ec158
R15 = c0000000e87c939c   R31 = 0000000000000000

pc = c000000000280f28 .jbd2_journal_commit_transaction+0x8ac/0x1bfc lr = c000000000280e58 .jbd2_journal_commit_transaction+0x7dc/0x1bfc
msr = 8000000000029032 cr = 24000084
ctr = 0000000000000000 xer = 0000000020000001 trap = 700
0:mon>

e2fsprog utility version is :

# /usr/local/e2fsprogs/sbin/mkfs.ext4 -V
mke2fs 1.41.6 (30-May-2009)
       Using EXT2FS Library version 1.41.6

Let me know if i can provide any other information.

Thanks
-Sachin

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------

Hmm, that's this ASSERT:

     J_ASSERT(commit_transaction->t_nr_buffers <=
              commit_transaction->t_outstanding_credits);

in jbd2_journal_commit_transaction(). That's not something I've ever seen before, nor have we made any changes in the jbd2 logic in quite some time that would could be related to that code.

Is it possible to extract out the contents of the commit_transaction structure? In particular, the t_nr_buffers and t_outstanding_credits value?

Also, how big was /dev/sda4?

At this point, I can't rule out a wild pointer corrupting the data structure, however improbable that sounds...

- Ted

Given the nature of the test being run (fsstress) it seems entirely possible that there is some transaction which doesn't reserve enough credits for the operation in some rare corner case?

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

That's possible, although we're running fsstress in the XFSQA tests.

Sanchin, what are the parameters used when you ran fsstress, and how big is the partition in question? How many CPU's are in the PowerPC system in question?

Thanks,

- Ted

Hi Ted,

So i have not been able to recreate this again in my last attempt. I will try couple of time to see if i can recreate this.

The box under test is a 4 way POWER6. The disk partition (/dev/sda4) in question is about 19GB.

fsstress was invoked with -p 50 -n 1000 -c -f dwrite=0

Thanks
-Sachin

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------

I have a script (thanks to Aneesh) which executes a series of test(like fsstress, fsx-linux and resize) with various ext4 mount options (data=journal, data=ordered, data=ordered,nodelalloc with 1024/4096 as size). While executing the above script for the first time i ran into this bug.

After the initial run i have rerun the tests 4 time now, but have not been able to recreate the same issue. [Although 4th time i ran into another issue. Will start a separate thread for that.]

As for this issue not sure how to proceed further. I probably will continue to execute the tests few more times. Maybe will try on a different box.

thanks
-Sachin

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------

After increasing nproc value from 50 to 150 (-p 150) i was able to recreate this bug again.

------------[ cut here ]------------
cpu 0x0: Vector: 700 (Program Check) at [c0000000fedeb970]
   pc: c000000000280f74: .jbd2_journal_commit_transaction+0x91c/0x1c6c
   lr: c000000000280f5c: .jbd2_journal_commit_transaction+0x904/0x1c6c
   sp: c0000000fedebbf0
  msr: 8000000000029032
 current = 0xc00000005e550c20
 paca    = 0xc000000000b62600
   pid   = 13149, comm = kjournald2

kernel BUG at fs/jbd2/commit.c:542!
enter ? for help
[c0000000fedebdd0] c000000000289cac .kjournald2+0x198/0x46c [c0000000fedebed0] c0000000000a86a0 .kthread+0xac/0xb8 [c0000000fedebf90] c00000000002ab3c .kernel_thread+0x54/0x70 0:mon> dl

The change in line number for commit.c (533 to 542) is because of some debug printk's i added in that file. Here are some of the last few statements from dmesg buffer.

<6>EXT4-fs: mballoc enabled
<6>EXT4-fs (sda4): mounted filesystem with journalled data mode
<4>JBD: Spotted dirty metadata buffer (dev = sda4, blocknr = 1089515). There's a risk of filesystem corruption in case of system crash. <4>JBD: Spotted dirty metadata buffer (dev = sda4, blocknr = 1089516). There's a risk of filesystem corruption in case of system crash. <4>JBD: Spotted dirty metadata buffer (dev = sda4, blocknr = 1089517). There's a risk of filesystem corruption in case of system crash. <4>JBD: Spotted dirty metadata buffer (dev = sda4, blocknr = 1089518). There's a risk of filesystem corruption in case of system crash. <1>nr_buffers = 1560
<1>outstanding_credits = 1557
<1>state = 4
<1>state = 4
<1>start = 4300814543
<1>updates = 0
<0>------------[ cut here ]------------
<2>kernel BUG at fs/jbd2/commit.c:542!

The nr_buffers value was 1560 while that of t_outstanding_credits was 1557.

Let me know if i can provide any other information to debug this issue. Have attached dmesg log.

Thanks
-Sachin

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------

------------[ cut here ]------------
cpu 0x0: Vector: 700 (Program Check) at [c0000000fedeb970]
    pc: c000000000280f74: .jbd2_journal_commit_transaction+0x91c/0x1c6c
    lr: c000000000280f5c: .jbd2_journal_commit_transaction+0x904/0x1c6c
    sp: c0000000fedebbf0
   msr: 8000000000029032
  current = 0xc00000005e550c20
  paca    = 0xc000000000b62600
    pid   = 13149, comm = kjournald2

kernel BUG at fs/jbd2/commit.c:542!
enter ? for help
[c0000000fedebdd0] c000000000289cac .kjournald2+0x198/0x46c [c0000000fedebed0] c0000000000a86a0 .kthread+0xac/0xb8 [c0000000fedebf90] c00000000002ab3c .kernel_thread+0x54/0x70 0:mon> dl
<4>Crash kernel location must be 0x2000000
<6>Reserving 256MB of memory at 32MB for crashkernel (System RAM: 4096MB) <6>Phyp-dump disabled at boot time
<6>Using pSeries machine description
<7>Page orders: linear mapping = 24, virtual = 16, io = 12, vmemmap = 24 <6>Using 1TB segments
<4>Found initrd at 0xc0000000034d0000:0xc000000003c92a47 <6>console [udbg0] enabled
<6>Partition configured for 4 cpus.
<6>CPU maps initialized for 2 threads per core
<7> (thread shift is 1)
<4>Starting Linux PPC64 #5 SMP Thu Sep 3 17:40:05 IST 2009 <4>-----------------------------------------------------

<4>ppc64_pft_size                = 0x1a
<4>physicalMemorySize            = 0x100000000
<4>htab_hash_mask                = 0x7ffff

<4>-----------------------------------------------------
<6>Initializing cgroup subsys cpuset
<6>Initializing cgroup subsys cpu
<5>Linux version 2.6.31-rc8-ext4 (root@llm62) (gcc version 4.3.2 [gcc-4_3-branch revision 141291] (SUSE Linux) ) #5 SMP Thu Sep 3 17:40:05 IST 2009 <4>[boot]0012 Setup Arch
<7>Node 0 Memory:
<7>Node 1 Memory: 0x0-0x100000000
<4>EEH: No capable adapters found
<6>PPC64 nvram contains 15360 bytes
<7>Using shared processor idle loop
<4>Zone PFN ranges:

<4>  DMA      0x00000000 -> 0x00010000
<4>  Normal   0x00010000 -> 0x00010000

<4>Movable zone start PFN for each node
<4>early_node_map[1] active PFN ranges
<4> 1: 0x00000000 -> 0x00010000
<4>Could not find start_pfn for node 0
<7>On node 0 totalpages: 0
<7>On node 1 totalpages: 65536

<7>  DMA zone: 56 pages used for memmap
<7>  DMA zone: 0 pages reserved
<7>  DMA zone: 65480 pages, LIFO batch:1

<4>[boot]0015 Setup Done
<4>Built 2 zonelists in Node order, mobility grouping on. Total pages: 65480
<4>Policy zone: DMA
<5>Kernel command line: root=/dev/sda5 sysrq=1 insmod=sym53c8xx insmod=ipr crashkernel=512M-:256M
<4>PID hash table entries: 4096 (order: 12, 32768 bytes)
<4>freeing bootmem node 1
<6>Memory: 3898432k/4194304k available (8640k kernel code, 295872k reserved, 2048k data, 4267k bss, 512k init) <6>SLUB: Genslabs=18, HWalign=128, Order=0-3, MinObjects=0, CPUs=4, Nodes=16
<6>Hierarchical RCU implementation.
<6>NR_IRQS:512
<4>[boot]0020 XICS Init
<4>[boot]0021 XICS Done
<7>pic: no ISA interrupt controller
<7>time_init: decrementer frequency = 512.000000 MHz
<7>time_init: processor frequency = 4704.000000 MHz
<6>clocksource: timebase mult[7d0000] shift[22] registered
<7>clockevent: decrementer mult[83126e97] shift[32] cpu[0]
<4>Console: colour dummy device 80x25
<6>console handover: boot [udbg0] -> real [hvc0]
<6>allocated 2621440 bytes of page_cgroup
<6>please try 'cgroup_disable=memory' option if you don't want memory cgroups
<6>Security Framework initialized
<6>SELinux: Disabled at boot.
<6>Dentry cache hash table entries: 524288 (order: 6, 4194304 bytes)
<6>Inode-cache hash table entries: 262144 (order: 5, 2097152 bytes)
<4>Mount-cache hash table entries: 4096
<6>Initializing cgroup subsys ns
<6>Initializing cgroup subsys cpuacct
<6>Initializing cgroup subsys memory
<6>Initializing cgroup subsys devices
<6>Initializing cgroup subsys freezer
<7>irq: irq 2 on host null mapped to virtual irq 16
<7>clockevent: decrementer mult[83126e97] shift[32] cpu[1]
<4>Processor 1 found.
<7>clockevent: decrementer mult[83126e97] shift[32] cpu[2]
<4>Processor 2 found.
<7>clockevent: decrementer mult[83126e97] shift[32] cpu[3]
<4>Processor 3 found.
<6>Brought up 4 CPUs
<7>Node 0 CPUs: 0-3
<7>Node 1 CPUs:
<7>CPU0 attaching sched-domain:
<7> domain 0: span 0-1 level SIBLING
<7> groups: 0 1
<7> domain 1: span 0-3 level CPU
<7> groups: 0-1 2-3
<7> domain 2: span 0-3 level NODE
<7> groups: 0-3 (__cpu_power = 2048)
<7>CPU1 attaching sched-domain:
<7> domain 0: span 0-1 level SIBLING
<7> groups: 1 0
<7> domain 1: span 0-3 level CPU
<7> groups: 0-1 2-3
<7> domain 2: span 0-3 level NODE
<7> groups: 0-3 (__cpu_power = 2048)
<7>CPU2 attaching sched-domain:
<7> domain 0: span 2-3 level SIBLING
<7> groups: 2 3
<7> domain 1: span 0-3 level CPU
<7> groups: 2-3 0-1
<7> domain 2: span 0-3 level NODE
<7> groups: 0-3 (__cpu_power = 2048)
<7>CPU3 attaching sched-domain:
<7> domain 0: span 2-3 level SIBLING
<7> groups: 3 2
<7> domain 1: span 0-3 level CPU
<7> groups: 2-3 0-1
<7> domain 2: span 0-3 level NODE
<7> groups: 0-3 (__cpu_power = 2048)
<6>NET: Registered protocol family 16
<6>IBM eBus Device Driver
<6>POWER6 performance monitor hardware support registered
<6>PCI: Probing PCI hardware
<7>PCI: Probing PCI hardware done
<4>bio: create slab <bio-0> at 0
<6>usbcore: registered new interface driver usbfs
<6>usbcore: registered new interface driver hub
<6>usbcore: registered new device driver usb
<6>NET: Registered protocol family 2
<6>IP route cache hash table entries: 32768 (order: 2, 262144 bytes)
<6>TCP established hash table entries: 131072 (order: 5, 2097152 bytes)
<6>TCP bind hash table entries: 65536 (order: 4, 1048576 bytes)
<6>TCP: Hash tables configured (established 131072 bind 65536)
<6>TCP reno registered
<6>NET: Registered protocol family 1
<6>Unpacking initramfs...
<7>Switched to high resolution mode on CPU 0
<7>Switched to high resolution mode on CPU 1
<7>Switched to high resolution mode on CPU 2
<7>Switched to high resolution mode on CPU 3
<7>irq: irq 655360 on host null mapped to virtual irq 17
<7>irq: irq 655362 on host null mapped to virtual irq 18
<6>IOMMU table initialized, virtual merging enabled
<7>irq: irq 589825 on host null mapped to virtual irq 19
<7>RTAS daemon started
<7>RTAS: event: 62, Type: Platform Error, Severity: 2
<6>audit: initializing netlink socket (disabled)
<5>type=2000 audit(1251980114.240:1): initialized
<6>HugeTLB registered 16 MB page size, pre-allocated 0 pages
<6>HugeTLB registered 16 GB page size, pre-allocated 0 pages
<5>VFS: Disk quotas dquot_6.5.2
<4>Dquot-cache hash table entries: 8192 (order 0, 65536 bytes)
<6>msgmni has been set to 7612
<6>alg: No test for stdrng (krng)
<6>Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
<6>io scheduler noop registered
<6>io scheduler anticipatory registered
<6>io scheduler deadline registered
<6>io scheduler cfq registered (default)
<6>pci_hotplug: PCI Hot Plug PCI Core version: 0.5
<6>rpaphp: RPA HOT Plug PCI Controller Driver version: 0.1
<7>vio_register_driver: driver hvc_console registering
<7>HVSI: registered 0 devices
<6>Generic RTC Driver v1.07
<6>Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
<6>pmac_zilog: 0.6 (Benjamin Herrenschmidt <[email protected]>)
<6>input: Macintosh mouse button emulation as /devices/virtual/input/input0
<6>Uniform Multi-Platform E-IDE driver
<6>ide-gd driver 1.18
<6>IBM eHEA ethernet device driver (Release EHEA_0102)
<7>irq: irq 590080 on host null mapped to virtual irq 256
<6>ehea: eth0: Jumbo frames are disabled
<6>ehea: eth0 -> logical port id #2
<6>ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
<6>ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
<6>mice: PS/2 mouse device common for all mice
<6>EDAC MC: Ver: 2.1.0 Aug 31 2009
<6>usbcore: registered new interface driver hiddev
<6>usbcore: registered new interface driver usbhid
<6>usbhid: v2.6:USB HID core driver
<6>TCP cubic registered
<6>NET: Registered protocol family 15
<4>registered taskstats version 1
<4>Freeing unused kernel memory: 512k freed
<6>SysRq : Changing Loglevel
<4>Loglevel set to 1
<5>SCSI subsystem initialized
<7>vio_register_driver: driver ibmvscsi registering
<6>ibmvscsi 30000002: SRP_VERSION: 16.a
<6>scsi0 : IBM POWER Virtual SCSI Adapter 1.5.8
<6>ibmvscsi 30000002: partner initialization complete
<6>ibmvscsi 30000002: host srp version: 16.a, host partition VIO (1), OS 3, max io 1048576
<3>ibmvscsi 30000002: fast_fail not supported in server
<6>ibmvscsi 30000002: Client reserve enabled
<6>ibmvscsi 30000002: sent SRP login
<6>ibmvscsi 30000002: SRP_LOGIN succeeded
<5>scsi 0:0:1:0: Direct-Access AIX VDASD 0001 PQ: 0 ANSI: 3
<6>udevd version 128 started
<5>sd 0:0:1:0: [sda] 167772160 512-byte logical blocks: (85.8 GB/80.0 GiB)
<5>sd 0:0:1:0: [sda] Write Protect is off
<7>sd 0:0:1:0: [sda] Mode Sense: 17 00 00 08
<5>sd 0:0:1:0: [sda] Cache data unavailable
<3>sd 0:0:1:0: [sda] Assuming drive cache: write through
<5>sd 0:0:1:0: [sda] Cache data unavailable
<3>sd 0:0:1:0: [sda] Assuming drive cache: write through
<6> sda: sda1 sda2 < sda5 > sda3 sda4
<5>sd 0:0:1:0: [sda] Cache data unavailable
<3>sd 0:0:1:0: [sda] Assuming drive cache: write through
<5>sd 0:0:1:0: [sda] Attached SCSI disk
<6>kjournald starting. Commit interval 5 seconds
<6>EXT3 FS on sda5, internal journal
<6>EXT3-fs: mounted filesystem with writeback data mode.
<6>udevd version 128 started
<5>sd 0:0:1:0: Attached scsi generic sg0 type 0
<6>Adding 1044096k swap on /dev/sda3. Priority:-1 extents:1 across:1044096k
<6>device-mapper: uevent: version 1.0.3
<6>device-mapper: ioctl: 4.15.0-ioctl (2009-04-01) initialised: [email protected]
<6>loop: module loaded
<6>fuse init (API version 7.12)
<7>irq: irq 780 on host null mapped to virtual irq 268
<6>ehea: eth0: Physical port up
<6>ehea: External switch port is backup port
<7>irq: irq 781 on host null mapped to virtual irq 269
<6>NET: Registered protocol family 10
<6>lo: Disabled Privacy Extensions
<7>eth0: no IPv6 routers present
<6>EXT4-fs (sda4): barriers enabled
<6>kjournald2 starting: pid 2470, dev sda4:8, commit interval 5 seconds
<6>EXT4-fs (sda4): internal journal on sda4:8
<6>EXT4-fs (sda4): delayed allocation enabled
<6>EXT4-fs: file extents enabled
<6>EXT4-fs: mballoc enabled
<6>EXT4-fs (sda4): mounted filesystem with ordered data mode
<6>EXT4-fs: mballoc: 0 blocks 0 reqs (0 success)
<6>EXT4-fs: mballoc: 0 extents scanned, 0 goal hits, 0 2^N hits, 0 breaks, 0 lost
<6>EXT4-fs: mballoc: 0 generated and it took 0
<6>EXT4-fs: mballoc: 0 preallocated, 0 discarded
<6>EXT4-fs (sda4): barriers enabled
<6>kjournald2 starting: pid 2496, dev sda4:8, commit interval 5 seconds
<6>EXT4-fs (sda4): internal journal on sda4:8
<6>EXT4-fs (sda4): delayed allocation enabled
<6>EXT4-fs: file extents enabled
<6>EXT4-fs: mballoc enabled
<6>EXT4-fs (sda4): mounted filesystem with ordered data mode
<6>EXT4-fs: mballoc: 6316218 blocks 10869 reqs (2718 success)
<6>EXT4-fs: mballoc: 27518 extents scanned, 2341 goal hits, 4450 2^N hits, 0 breaks, 0 lost
<6>EXT4-fs: mballoc: 896 generated and it took 148897
<6>EXT4-fs: mballoc: 6538210 preallocated, 6274779 discarded
<6>EXT4-fs (sda4): barriers enabled
<6>kjournald2 starting: pid 2577, dev sda4:8, commit interval 5 seconds
<6>EXT4-fs (sda4): internal journal on sda4:8
<6>EXT4-fs (sda4): delayed allocation enabled
<6>EXT4-fs: file extents enabled
<6>EXT4-fs: mballoc enabled
<6>EXT4-fs (sda4): mounted filesystem with ordered data mode
<6>EXT4-fs: mballoc: 19076715 blocks 456774 reqs (317263 success)
<6>EXT4-fs: mballoc: 18713654 extents scanned, 2719 goal hits, 105504 2^N hits, 92395 breaks, 5 lost
<6>EXT4-fs: mballoc: 2920 generated and it took 1307140
<6>EXT4-fs: mballoc: 6234268 preallocated, 4510097 discarded
<6>EXT4-fs (sda4): barriers enabled
<6>kjournald2 starting: pid 2644, dev sda4:8, commit interval 5 seconds
<6>EXT4-fs (sda4): internal journal on sda4:8
<6>EXT4-fs (sda4): delayed allocation enabled
<6>EXT4-fs: file extents enabled
<6>EXT4-fs: mballoc enabled
<6>EXT4-fs (sda4): mounted filesystem with ordered data mode
<6>EXT4-fs: mballoc: 6220451 blocks 7639 reqs (5005 success)
<6>EXT4-fs: mballoc: 155191 extents scanned, 2611 goal hits, 3143 2^N hits, 702 breaks, 35 lost
<6>EXT4-fs: mballoc: 5198 generated and it took 1487446
<6>EXT4-fs: mballoc: 3712797 preallocated, 255769 discarded
<6>EXT4-fs (sda4): barriers enabled
<6>kjournald2 starting: pid 22997, dev sda4:8, commit interval 5 seconds
<6>EXT4-fs (sda4): internal journal on sda4:8
<4>EXT4-fs (sda4): Ignoring delalloc option - requested data journaling mode
<6>EXT4-fs: file extents enabled
<6>EXT4-fs: mballoc enabled
<6>EXT4-fs (sda4): mounted filesystem with journalled data mode
<6>EXT4-fs: mballoc: 0 blocks 0 reqs (0 success)
<6>EXT4-fs: mballoc: 0 extents scanned, 0 goal hits, 0 2^N hits, 0 breaks, 0 lost
<6>EXT4-fs: mballoc: 0 generated and it took 0
<6>EXT4-fs: mballoc: 0 preallocated, 0 discarded
<6>EXT4-fs (sda4): barriers enabled
<6>kjournald2 starting: pid 23022, dev sda4:8, commit interval 5 seconds
<6>EXT4-fs (sda4): internal journal on sda4:8
<4>EXT4-fs (sda4): Ignoring delalloc option - requested data journaling mode
<6>EXT4-fs: file extents enabled
<6>EXT4-fs: mballoc enabled
<6>EXT4-fs (sda4): mounted filesystem with journalled data mode
<6>EXT4-fs: mballoc: 614411 blocks 14001 reqs (1591 success)
<6>EXT4-fs: mballoc: 84926 extents scanned, 2606 goal hits, 7016 2^N hits, 0 breaks, 0 lost
<6>EXT4-fs: mballoc: 56 generated and it took 24655
<6>EXT4-fs: mballoc: 3030592 preallocated, 1996613 discarded
<6>EXT4-fs (sda4): barriers enabled
<6>kjournald2 starting: pid 23097, dev sda4:8, commit interval 5 seconds
<6>EXT4-fs (sda4): internal journal on sda4:8
<4>EXT4-fs (sda4): Ignoring delalloc option - requested data journaling mode
<6>EXT4-fs: file extents enabled
<6>EXT4-fs: mballoc enabled
<6>EXT4-fs (sda4): mounted filesystem with journalled data mode
<6>EXT4-fs: mballoc: 83691 blocks 83691 reqs (0 success)
<6>EXT4-fs: mballoc: 4557305 extents scanned, 28226 goal hits, 32220 2^N hits, 22231 breaks, 0 lost
<6>EXT4-fs: mballoc: 183 generated and it took 169061
<6>EXT4-fs: mballoc: 5727024 preallocated, 1058154 discarded
<6>EXT4-fs (sda4): barriers enabled
<6>kjournald2 starting: pid 23164, dev sda4:8, commit interval 5 seconds
<6>EXT4-fs (sda4): internal journal on sda4:8
<4>EXT4-fs (sda4): Ignoring delalloc option - requested data journaling mode
<6>EXT4-fs: file extents enabled
<6>EXT4-fs: mballoc enabled
<6>EXT4-fs (sda4): mounted filesystem with journalled data mode
<6>EXT4-fs: mballoc: 846 blocks 846 reqs (0 success)
<6>EXT4-fs: mballoc: 846 extents scanned, 69 goal hits, 777 2^N hits, 0 breaks, 0 lost
<6>EXT4-fs: mballoc: 40 generated and it took 20887
<6>EXT4-fs: mballoc: 1171942 preallocated, 42496 discarded
<6>EXT4-fs (sda4): barriers enabled
<6>kjournald2 starting: pid 24964, dev sda4:8, commit interval 5 seconds
<6>EXT4-fs (sda4): internal journal on sda4:8
<6>EXT4-fs (sda4): delayed allocation enabled
<6>EXT4-fs: file extents enabled
<6>EXT4-fs: mballoc enabled
<6>EXT4-fs (sda4): mounted filesystem with ordered data mode
<6>EXT4-fs: mballoc: 18741536 blocks 32464 reqs (8049 success)
<6>EXT4-fs: mballoc: 299662 extents scanned, 6400 goal hits, 12567 2^N hits, 1020 breaks, 0 lost
<6>EXT4-fs: mballoc: 2408 generated and it took 399674
<6>EXT4-fs: mballoc: 18770332 preallocated, 17992765 discarded
<6>EXT4-fs (sda4): barriers enabled
<6>kjournald2 starting: pid 25162, dev sda4:8, commit interval 5 seconds
<6>EXT4-fs (sda4): internal journal on sda4:8
<6>EXT4-fs (sda4): delayed allocation enabled
<6>EXT4-fs: file extents enabled
<6>EXT4-fs: mballoc enabled
<6>EXT4-fs (sda4): mounted filesystem with ordered data mode
<6>EXT4-fs: mballoc: 6530971 blocks 8232 reqs (5365 success)
<6>EXT4-fs: mballoc: 167871 extents scanned, 2905 goal hits, 3279 2^N hits, 765 breaks, 56 lost
<6>EXT4-fs: mballoc: 5704 generated and it took 1692089
<6>EXT4-fs: mballoc: 3997891 preallocated, 254614 discarded
<6>EXT4-fs (sda4): barriers enabled
<6>kjournald2 starting: pid 13149, dev sda4:8, commit interval 5 seconds
<6>EXT4-fs (sda4): internal journal on sda4:8
<4>EXT4-fs (sda4): Ignoring delalloc option - requested data journaling mode
<6>EXT4-fs: file extents enabled
<6>EXT4-fs: mballoc enabled
<6>EXT4-fs (sda4): mounted filesystem with journalled data mode
<4>JBD: Spotted dirty metadata buffer (dev = sda4, blocknr = 1089515). There's a risk of filesystem corruption in case of system crash. <4>JBD: Spotted dirty metadata buffer (dev = sda4, blocknr = 1089516). There's a risk of filesystem corruption in case of system crash. <4>JBD: Spotted dirty metadata buffer (dev = sda4, blocknr = 1089517). There's a risk of filesystem corruption in case of system crash. <4>JBD: Spotted dirty metadata buffer (dev = sda4, blocknr = 1089518). There's a risk of filesystem corruption in case of system crash. <1>nr_buffers = 1560
<1>outstanding_credits = 1557
<1>state = 4
<1>state = 4
<1>start = 4300814543
<1>updates = 0
<0>------------[ cut here ]------------
<2>kernel BUG at fs/jbd2/commit.c:542!
0:mon>
0:mon> r

R00 = 0000000000000001   R16 = c00000005e6dc560
R01 = c0000000fedebbf0   R17 = 0000000000000000
R02 = c000000000a6f1f8   R18 = 0000000000000000
R03 = 0000000000000012   R19 = 0000000000000409
R04 = 0000000000000000   R20 = 0000000000000001
R05 = ffffffffffffffff   R21 = 0000000000000001
R06 = 0000000000000002   R22 = c0000000fedebc78
R07 = c000000000779d51   R23 = 0000000000000000
R08 = c000000000c07248   R24 = c0000000f3e1b800
R09 = 0000000000000618   R25 = c00000005e6dc570
R10 = c000000000c07750   R26 = c00000005e6dc500
R11 = 0000000000000001   R27 = c00000005e6dc550
R12 = 0000000028000082   R28 = c0000000fedebc78
R13 = c000000000b62600   R29 = c000000000779d23
R14 = c0000000008325c8   R30 = c0000000009ec158
R15 = c0000000f3e1bb9c   R31 = 0000000000000000

pc = c000000000280f74 .jbd2_journal_commit_transaction+0x91c/0x1c6c lr = c000000000280f5c .jbd2_journal_commit_transaction+0x904/0x1c6c
msr = 8000000000029032 cr = 28000084
ctr = 0000000000000001 xer = 0000000020000001 trap = 700
0:mon>

Can you find the below info

a) blocksize with which the file system was created
b) I guess the file system was in data=journal mode (looking at the dmesg output)

-aneesh

/usr/local/e2fsprogs/sbin/mkfs.ext4 -b 4096 /dev/sda4

Yes.
mount -t ext4 -o errors=panic,data=journal /dev/sda4 /mnt/tmp/

Thanks
-Sachin

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------

Let me know if there is any thing i could try to help find a solution for this problem. After increasing the nproc value, i am able to consistently recreate this issue.

Thanks
-Sachin

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------

Can you confirm that you are able to reproduce it only on powerpc and not on x86/x86-64 ?

-aneesh

Till date i have seen this problem on powerpc only. Have not been able to recreate this on x86/x86_64.

Thanks
-Sachin

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------

I still have this bug with 2.6.31. Is there a solution available for this ?

Let me know if i can help debug this in any way ?

Thanks
-Sachin

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------