kernel BUG in find_lock_entries

kernel BUG in find_lock_entries

[Dae R. Jeong]

Hi,

We observed an issue "kernel BUG in find_lock_entries". This was
observed a few months ago.

Unfortunately, we have not found a reproducer for the crash yet. We
will inform you if we have any update on this crash.

Detailed crash information is attached below.

Best regards,
Dae R. Jeong

-----
- Kernel version:
6.0-rc7

- Crash report:
------------[ cut here ]------------
kernel BUG at mm/filemap.c:2112!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 18497 Comm: syz-executor.0 Not tainted 6.0.0-rc7-00167-g92162e4a9862 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:find_lock_entries+0xa93/0xaa0 mm/filemap.c:2111
Code: 4c 89 ef 48 c7 c6 c0 2a bc 8b e8 b8 ce 0e 00 0f 0b e8 71 99 a8 09 e8 4c 04 d3 ff 4c 89 ef 48 c7 c6 a0 1e bc 8b e8 9d ce 0e 00 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 55 48 89 e5 41 57 41 56 41
RSP: 0018:ffffc90009e0f9c0 EFLAGS: 00010246
RAX: 9de53b58cea03600 RBX: ffffea0000664dc0 RCX: 0000000000040000
RDX: ffffc90011e81000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffc90009e0faf0 R08: ffffffff81e3af0a R09: ffffed1026b84f14
R10: ffffed1026b84f14 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffea0000664dc0 R14: 00fff00000020015 R15: ffffc90009e0fa40
FS:  00007fa68d5be700(0000) GS:ffff888135c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056481d8d7317 CR3: 0000000018571000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 truncate_inode_pages_range+0x195/0x1120 mm/truncate.c:364
 kill_bdev block/bdev.c:75 [inline]
 set_blocksize+0x348/0x3c0 block/bdev.c:151
 blkdev_bszset+0x202/0x2a0 block/ioctl.c:459
 blkdev_ioctl+0x225/0x810 block/ioctl.c:597
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0x110/0x180 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4e/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x4725fd
Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa68d5bdbe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000057bf80 RCX: 00000000004725fd
RDX: 0000000020000080 RSI: 0000000040081271 RDI: 0000000000000005
RBP: 00000000f477909a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000057cbd8
R13: 000000000057bf8c R14: 00007ffddba46f90 R15: 00007fa68d5bdd80
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:find_lock_entries+0xa93/0xaa0 mm/filemap.c:2111
Code: 4c 89 ef 48 c7 c6 c0 2a bc 8b e8 b8 ce 0e 00 0f 0b e8 71 99 a8 09 e8 4c 04 d3 ff 4c 89 ef 48 c7 c6 a0 1e bc 8b e8 9d ce 0e 00 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 55 48 89 e5 41 57 41 56 41
RSP: 0018:ffffc90009e0f9c0 EFLAGS: 00010246
RAX: 9de53b58cea03600 RBX: ffffea0000664dc0 RCX: 0000000000040000
RDX: ffffc90011e81000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffc90009e0faf0 R08: ffffffff81e3af0a R09: ffffed1026b84f14
R10: ffffed1026b84f14 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffea0000664dc0 R14: 00fff00000020015 R15: ffffc90009e0fa40
FS:  00007fa68d5be700(0000) GS:ffff888135c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056481d8d7317 CR3: 0000000018571000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Re: kernel BUG in find_lock_entries

[Jens Axboe]

On 4/5/23 4:52 AM, Dae R. Jeong wrote:
> Hi,
> 
> We observed an issue "kernel BUG in find_lock_entries". This was
> observed a few months ago.
> 
> Unfortunately, we have not found a reproducer for the crash yet. We
> will inform you if we have any update on this crash.
> 
> Detailed crash information is attached below.
> 
> Best regards,
> Dae R. Jeong
> 
> -----
> - Kernel version:
> 6.0-rc7

This is pretty old. Does it trigger on a current kernel?

-- 
Jens Axboe

Re: kernel BUG in find_lock_entries

[Dae R. Jeong]

On Thu, Apr 6, 2023 at 1:46 AM Jens Axboe <axboe@kernel.dk> wrote:
>
> On 4/5/23 4:52 AM, Dae R. Jeong wrote:
> > Hi,
> >
> > We observed an issue "kernel BUG in find_lock_entries". This was
> > observed a few months ago.
> >
> > Unfortunately, we have not found a reproducer for the crash yet. We
> > will inform you if we have any update on this crash.
> >
> > Detailed crash information is attached below.
> >
> > Best regards,
> > Dae R. Jeong
> >
> > -----
> > - Kernel version:
> > 6.0-rc7
>
> This is pretty old. Does it trigger on a current kernel?

I'm not sure, but I don't think I've seen it recently.
I will let you know if I observe it again.
I'm sorry for wasting your time.

> --
> Jens Axboe
>
>

Best regards,
Dae R. Jeong.