New: BUG: using smp_processor_id() in preemptible, caller is ext4_mb_new_blocks
https://bugzilla.kernel.org/show_bug.cgi?id=208173
Bug ID: 208173
Summary: BUG: using smp_processor_id() in preemptible, caller
is ext4_mb_new_blocks
Product: File System
Version: 2.5
Kernel Version: 5.8.0-rc1
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
Assignee: [email protected]
Reporter: [email protected]
Regression: NoCreated attachment 289655
--> https://bugzilla.kernel.org/attachment.cgi?id=289655&action=edit
dmesg
Immediately after booting 5.8.0-rc1 and logging in, dmesg is filled with BUG backtraces like:
[ 10.823091] BUG: using smp_processor_id() in preemptible [00000000] code: auditd/788 [ 10.823095] caller is ext4_mb_new_blocks+0x285/0xd50 [ 10.823096] CPU: 2 PID: 788 Comm: auditd Not tainted 5.8.0-rc1 #15 [ 10.823097] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Z77 Extreme4, BIOS P2.90 07/11/2013 [ 10.823097] Call Trace: [ 10.823104] dump_stack+0x57/0x70 [ 10.823107] check_preemption_disabled+0xab/0xc0 [ 10.823109] ext4_mb_new_blocks+0x285/0xd50 [ 10.823112] ? __kmalloc+0x1ac/0x280 [ 10.823114] ? ext4_find_extent+0x2a1/0x370 [ 10.823116] ? ext4_find_extent+0x163/0x370 [ 10.823118] ? release_pages+0x3b1/0x470 [ 10.823120] ext4_ext_map_blocks+0x84d/0xcc0 [ 10.823122] ext4_map_blocks+0xef/0x560 [ 10.823124] ? kmem_cache_alloc+0x181/0x220 [ 10.823126] ext4_writepages+0x856/0xe00 [ 10.823130] ? futex_wait+0x11d/0x210 [ 10.823132] ? do_writepages+0x41/0xd0 [ 10.823134] ? __ext4_mark_inode_dirty+0x250/0x250 [ 10.823134] do_writepages+0x41/0xd0 [ 10.823137] ? wbc_attach_and_unlock_inode+0xd6/0x140 [ 10.823139] __filemap_fdatawrite_range+0xcb/0x100 [ 10.823141] file_write_and_wait_range+0x5e/0xb0 [ 10.823143] ext4_sync_file+0x10c/0x3a0 [ 10.823144] do_fsync+0x38/0x70 [ 10.823146] __x64_sys_fsync+0x10/0x20 [ 10.823147] do_syscall_64+0x47/0x80 [ 10.823150] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 10.823152] RIP: 0033:0x7fb904384f1b [ 10.823152] Code: Bad RIP value. [ 10.823153] RSP: 002b:00007fb903d4cd00 EFLAGS: 00000293 ORIG_RAX: 000000000000004a [ 10.823154] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb904384f1b [ 10.823155] RDX: 0000000000000001 RSI: 0000000000000081 RDI: 0000000000000005 [ 10.823155] RBP: 000055c4f63e82c0 R08: 0000000000000000 R09: 00007fb903d4d700 [ 10.823156] R10: 0000000000000000 R11: 0000000000000293 R12: 00007ffd56550cce [ 10.823156] R13: 00007ffd56550ccf R14: 00007ffd56550cd0 R15:
00007fb903d4d700
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[Bug 208173] BUG: using smp_processor_id() in preemptible, caller is ext4_mb_new_blocks
https://bugzilla.kernel.org/show_bug.cgi?id=208173
--- Comment #1 from Tom Seewald ([email protected]) --- Created attachment 289657
--> https://bugzilla.kernel.org/attachment.cgi?id=289657&action=edit
kernel config
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[Bug 208173] BUG: using smp_processor_id() in preemptible, caller is ext4_mb_new_blocks
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=208173
Theodore Tso ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |[email protected]
Resolution|--- |CODE_FIX--- Comment #2 from Theodore Tso ([email protected]) --- Fixed in [1]
Which unfortunately just missed getting included in 5.8-rc1.
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[Bug 208173] BUG: using smp_processor_id() in preemptible, caller is ext4_mb_new_blocks
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=208173
--- Comment #3 from Tom Seewald ([email protected]) ---
After looking around, syzkaller already found this bug [1], and a fix was already posted [2] but Linus didn't pull it before tagging the rc1 release.
I manually applied commit 811985365378df01386c3cfb7ff716e74ca376d5 ("ext4:
mballoc: Use this_cpu_read instead of this_cpu_ptr") from
https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git, and I can confirm that this fixes the problem. Hopefully this makes it in by rc2.
I'll close this report once Linus pulls the fix.
[1]
https://syzkaller.appspot.com/bug?id=b7f459091a40a67a13f27d2281281ffd0ed8e5e1
[2] https://lore.kernel.org/lkml/[email protected]/T/
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