[WARN 6.16-rc3] warning in bdev_count_inflight()

[WARN 6.16-rc3] warning in bdev_count_inflight()

[Dave Chinner]

Hi Jens,

I had this warning fire on 6.16-rc3 whilst running fstests. I don't
know what test caused it - I run 64 tests in parallel over a couple
of hundred loop devices, so there's lots of stuff going on all the
time.

This warning fired when xfs_repair was running on some kind of DM
device:

[ 7339.374977] ------------[ cut here ]------------
[ 7339.378576] WARNING: CPU: 49 PID: 2034647 at block/genhd.c:144 bdev_count_inflight+0x7c/0x90
[ 7339.382933] Modules linked in:
[ 7339.385169] CPU: 49 UID: 0 PID: 2034647 Comm: xfs_repair Not tainted 6.16.0-rc3-dgc+ #342 PREEMPT(full)
[ 7339.390668] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 7339.396211] RIP: 0010:bdev_count_inflight+0x7c/0x90
[ 7339.399196] Code: ff 48 8b 94 16 90 00 00 00 01 d3 48 ff c0 eb bc 45 85 ff 78 15 85 db 78 1a 44 01 fb 89 d8 5b 41 5e 41 5f 5d c3 cc cc cc cc cc <0f> 0b 45 31 ff 85 db 79 e6 0f 0b 31 db eb e0 0f 1f 44 00 00 90 90
[ 7339.409039] RSP: 0018:ffffc900100bf978 EFLAGS: 00010286
[ 7339.412126] RAX: 0000000000000040 RBX: 0000000000000000 RCX: 0000000000000040
[ 7339.417910] RDX: 0000000000000040 RSI: 0000000000000040 RDI: ffffffff82f911c8
[ 7339.421923] RBP: ffffc900100bf990 R08: 0000000000000c00 R09: ffff889878c81400
[ 7339.425940] R10: 0000000000000000 R11: ffffffff823dc150 R12: 00000001006b668c
[ 7339.433641] R13: ffff889849c98600 R14: ffff889849c98600 R15: 00000000ffffffff
[ 7339.437308] FS:  00007f383ad55680(0000) GS:ffff88a09a4b1000(0000) knlGS:0000000000000000
[ 7339.441577] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 7339.444716] CR2: 00007f3820000020 CR3: 0000001886ec6000 CR4: 0000000000350ef0
[ 7339.447851] Call Trace:
[ 7339.449436]  <TASK>
[ 7339.450683]  bdev_start_io_acct+0x58/0xc0
[ 7339.452661]  dm_io_acct+0x60/0x100
[ 7339.454471]  dm_submit_bio_remap+0x4f/0x100
[ 7339.456592]  __map_bio+0x125/0x260
[ 7339.458423]  dm_submit_bio+0x562/0xd70
[ 7339.459996]  ? kmem_cache_alloc_noprof+0x188/0x320
[ 7339.462501]  ? __blk_flush_plug+0xe6/0x140
[ 7339.464613]  __submit_bio+0x12c/0x210
[ 7339.467010]  submit_bio_noacct_nocheck+0x12e/0x2a0
[ 7339.469166]  ? iov_iter_extract_pages+0x152/0x220
[ 7339.476238]  submit_bio_noacct+0x2fd/0x380
[ 7339.478354]  submit_bio+0xe5/0xf0
[ 7339.480182]  submit_bio_wait+0x54/0xc0
[ 7339.481722]  blkdev_direct_IO+0x415/0x480
[ 7339.483977]  ? __pfx_submit_bio_wait_endio+0x10/0x10
[ 7339.487079]  blkdev_read_iter+0x9d/0x170
[ 7339.494123]  vfs_read+0x269/0x2f0
[ 7339.494131]  __x64_sys_pread64+0x71/0xc0
[ 7339.494134]  x64_sys_call+0x28ca/0x2f60
[ 7339.498789]  do_syscall_64+0x6b/0x1f0
[ 7339.498794]  ? exc_page_fault+0x70/0xa0
[ 7339.498798]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 7339.505840] RIP: 0033:0x7f383dd039ee
[ 7339.505845] Code: 08 0f 85 f5 4b ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
[ 7339.505848] RSP: 002b:00007f383ad548e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
[ 7339.505851] RAX: ffffffffffffffda RBX: 00007f383ad55680 RCX: 00007f383dd039ee
[ 7339.505854] RDX: 0000000000000200 RSI: 000055f7bb191400 RDI: 0000000000000004
[ 7339.538888] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
[ 7339.541277] RBP: 0000000000000200 R08: 0000000000000000 R09: 0000000000000000
[ 7339.541282] R10: 000000001c200000 R11: 0000000000000246 R12: 00000000000e1000
[ 7339.544844]  49-....
[ 7339.548428] R13: 0000000000000001 R14: 00007f383ad54a60 R15: 000055f7bb186ae0
[ 7339.548433]  </TASK>

I have no idea if it is reproducable - this is the first time I've
hit it. I've cc'd the DM list so they are aware of this, too.

-Dave.

-- 
Dave Chinner
david@fromorbit.com

Re: [WARN 6.16-rc3] warning in bdev_count_inflight()

[Dave Chinner]

On Wed, Jun 25, 2025 at 06:26:14PM +1000, Dave Chinner wrote:
> Hi Jens,
> 
> I had this warning fire on 6.16-rc3 whilst running fstests. I don't
> know what test caused it - I run 64 tests in parallel over a couple
> of hundred loop devices, so there's lots of stuff going on all the
> time.
> 
> This warning fired when xfs_repair was running on some kind of DM
> device:
> 
> [ 7339.374977] ------------[ cut here ]------------
> [ 7339.378576] WARNING: CPU: 49 PID: 2034647 at block/genhd.c:144 bdev_count_inflight+0x7c/0x90
> [ 7339.382933] Modules linked in:
> [ 7339.385169] CPU: 49 UID: 0 PID: 2034647 Comm: xfs_repair Not tainted 6.16.0-rc3-dgc+ #342 PREEMPT(full)
> [ 7339.390668] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
> [ 7339.396211] RIP: 0010:bdev_count_inflight+0x7c/0x90
> [ 7339.399196] Code: ff 48 8b 94 16 90 00 00 00 01 d3 48 ff c0 eb bc 45 85 ff 78 15 85 db 78 1a 44 01 fb 89 d8 5b 41 5e 41 5f 5d c3 cc cc cc cc cc <0f> 0b 45 31 ff 85 db 79 e6 0f 0b 31 db eb e0 0f 1f 44 00 00 90 90
> [ 7339.409039] RSP: 0018:ffffc900100bf978 EFLAGS: 00010286
> [ 7339.412126] RAX: 0000000000000040 RBX: 0000000000000000 RCX: 0000000000000040
> [ 7339.417910] RDX: 0000000000000040 RSI: 0000000000000040 RDI: ffffffff82f911c8
> [ 7339.421923] RBP: ffffc900100bf990 R08: 0000000000000c00 R09: ffff889878c81400
> [ 7339.425940] R10: 0000000000000000 R11: ffffffff823dc150 R12: 00000001006b668c
> [ 7339.433641] R13: ffff889849c98600 R14: ffff889849c98600 R15: 00000000ffffffff
> [ 7339.437308] FS:  00007f383ad55680(0000) GS:ffff88a09a4b1000(0000) knlGS:0000000000000000
> [ 7339.441577] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 7339.444716] CR2: 00007f3820000020 CR3: 0000001886ec6000 CR4: 0000000000350ef0
> [ 7339.447851] Call Trace:
> [ 7339.449436]  <TASK>
> [ 7339.450683]  bdev_start_io_acct+0x58/0xc0
> [ 7339.452661]  dm_io_acct+0x60/0x100
> [ 7339.454471]  dm_submit_bio_remap+0x4f/0x100
> [ 7339.456592]  __map_bio+0x125/0x260
> [ 7339.458423]  dm_submit_bio+0x562/0xd70
> [ 7339.459996]  ? kmem_cache_alloc_noprof+0x188/0x320
> [ 7339.462501]  ? __blk_flush_plug+0xe6/0x140
> [ 7339.464613]  __submit_bio+0x12c/0x210
> [ 7339.467010]  submit_bio_noacct_nocheck+0x12e/0x2a0
> [ 7339.469166]  ? iov_iter_extract_pages+0x152/0x220
> [ 7339.476238]  submit_bio_noacct+0x2fd/0x380
> [ 7339.478354]  submit_bio+0xe5/0xf0
> [ 7339.480182]  submit_bio_wait+0x54/0xc0
> [ 7339.481722]  blkdev_direct_IO+0x415/0x480
> [ 7339.483977]  ? __pfx_submit_bio_wait_endio+0x10/0x10
> [ 7339.487079]  blkdev_read_iter+0x9d/0x170
> [ 7339.494123]  vfs_read+0x269/0x2f0
> [ 7339.494131]  __x64_sys_pread64+0x71/0xc0
> [ 7339.494134]  x64_sys_call+0x28ca/0x2f60
> [ 7339.498789]  do_syscall_64+0x6b/0x1f0
> [ 7339.498794]  ? exc_page_fault+0x70/0xa0
> [ 7339.498798]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
> [ 7339.505840] RIP: 0033:0x7f383dd039ee
> [ 7339.505845] Code: 08 0f 85 f5 4b ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
> [ 7339.505848] RSP: 002b:00007f383ad548e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
> [ 7339.505851] RAX: ffffffffffffffda RBX: 00007f383ad55680 RCX: 00007f383dd039ee
> [ 7339.505854] RDX: 0000000000000200 RSI: 000055f7bb191400 RDI: 0000000000000004
> [ 7339.538888] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
> [ 7339.541277] RBP: 0000000000000200 R08: 0000000000000000 R09: 0000000000000000
> [ 7339.541282] R10: 000000001c200000 R11: 0000000000000246 R12: 00000000000e1000
> [ 7339.544844]  49-....
> [ 7339.548428] R13: 0000000000000001 R14: 00007f383ad54a60 R15: 000055f7bb186ae0
> [ 7339.548433]  </TASK>
> 

Not a one-off. Just hit it again from fsx doing RWF_DONTCACHE IO,
and given that I've never seen this until 6.16-rc3, it's probably a
recent regression.

 ------------[ cut here ]------------
 WARNING: CPU: 11 PID: 1137920 at block/genhd.c:146 bdev_count_inflight+0x85/0x90
 Modules linked in:
 CPU: 11 UID: 0 PID: 1137920 Comm: fsx Tainted: G        W           6.16.0-rc3-dgc+ #342 PREEMPT(full)
 Tainted: [W]=WARN
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
 RIP: 0010:bdev_count_inflight+0x85/0x90
 Code: 01 d3 48 ff c0 eb bc 45 85 ff 78 15 85 db 78 1a 44 01 fb 89 d8 5b 41 5e 41 5f 5d c3 cc cc cc cc cc 0f 0b 45 31 ff 85 db 79 e6 <0f> 0b 31 db eb e0 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90
 XFS (loop357): Mounting V5 Filesystem 8c4f5c6c-3a2b-402d-96ed-19ccc1845e50
 RSP: 0018:ffffc9000d727700 EFLAGS: 00010286
 RAX: 0000000000000040 RBX: 00000000ffffffff RCX: 0000000000000040
 RDX: 0000000000000040 RSI: 0000000000000040 RDI: ffffffff82f911c8
 RBP: ffffc9000d727718 R08: 00000000000003f0 R09: 000018795ca45f1b
 R10: 0000000000000000 R11: ffffffff81328110 R12: 00000001015980ee
 R13: 0000000000000000 R14: ffff88884400b000 R15: 0000000000000000
 FS:  00007f5978c75740(0000) GS:ffff88889a731000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 000055c7311d1918 CR3: 00000009ac6b6000 CR4: 0000000000350ef0
 Call Trace:
  <TASK>
  update_io_ticks+0x47/0x80
  blk_account_io_start+0xd4/0x190
  blk_mq_submit_bio+0x259/0x700
  __submit_bio+0x99/0x210
  submit_bio_noacct_nocheck+0xad/0x2a0
  submit_bio_noacct+0x2fd/0x380
  submit_bio+0xe5/0xf0
  xfs_submit_ioend+0x9b/0xb0
  iomap_writepages+0xaab/0xb40
  xfs_vm_writepages+0x1b2/0x1e0
  do_writepages+0xbf/0x1d0
  filemap_fdatawrite_range_kick+0x84/0xb0
  xfs_file_buffered_write+0x22d/0x290
  xfs_file_write_iter+0x137/0x270
  do_iter_readv_writev+0x190/0x1f0
  vfs_writev+0x11a/0x350
  __se_sys_pwritev2+0x6b/0xf0
  __x64_sys_pwritev2+0x25/0x30
  x64_sys_call+0x1d0c/0x2f60
  do_syscall_64+0x6b/0x1f0

> I have no idea if it is reproducable - this is the first time I've
> hit it. I've cc'd the DM list so they are aware of this, too.

Latest hit indicates that it has nothing to do with DM at all.

-Dave.
-- 
Dave Chinner
david@fromorbit.com

Re: [WARN 6.16-rc3] warning in bdev_count_inflight()

[Christoph Hellwig]

There's a test patch for this on the list:

https://lore.kernel.org/linux-block/aFtUXy-lct0WxY2w@mozart.vkv.me/T/#t

Re: [WARN 6.16-rc3] warning in bdev_count_inflight()

[Dave Chinner]

On Wed, Jun 25, 2025 at 04:28:06AM -0700, Christoph Hellwig wrote:
> There's a test patch for this on the list:
> 
> https://lore.kernel.org/linux-block/aFtUXy-lct0WxY2w@mozart.vkv.me/T/#t

Ok, so when is this planned to be fixed? I've hit this at least a
dozen times in the past hour with check-parallel - it's causing
significant problems because random tests see this trace in dmesg
output and fail, even though the tests themselves have passed....

-Dave.
-- 
Dave Chinner
david@fromorbit.com

Re: [WARN 6.16-rc3] warning in bdev_count_inflight()

[Christoph Hellwig]

On Wed, Jun 25, 2025 at 10:12:25PM +1000, Dave Chinner wrote:
> On Wed, Jun 25, 2025 at 04:28:06AM -0700, Christoph Hellwig wrote:
> > There's a test patch for this on the list:
> > 
> > https://lore.kernel.org/linux-block/aFtUXy-lct0WxY2w@mozart.vkv.me/T/#t
> 
> Ok, so when is this planned to be fixed? I've hit this at least a
> dozen times in the past hour with check-parallel - it's causing
> significant problems because random tests see this trace in dmesg
> output and fail, even though the tests themselves have passed....

From reading the thread I'd expect a patch to be submitted ASAP,
but that's as far as my crystal ball reaches.

Re: [WARN 6.16-rc3] warning in bdev_count_inflight()

[Damien Le Moal]

On 6/25/25 18:00, Dave Chinner wrote:
> On Wed, Jun 25, 2025 at 06:26:14PM +1000, Dave Chinner wrote:
>> Hi Jens,
>>
>> I had this warning fire on 6.16-rc3 whilst running fstests. I don't
>> know what test caused it - I run 64 tests in parallel over a couple
>> of hundred loop devices, so there's lots of stuff going on all the
>> time.
>>
>> This warning fired when xfs_repair was running on some kind of DM
>> device:

You are not alone seeing this one. Shin'ichiro saw it with blktests runs and
other peoples have mentioned seeing it with various hardware as well. We have no
reliable reproducer yet, and because it randomly shows up. So it is hard to
debug. This is since 6.16-rc1 I think.

>>
>> [ 7339.374977] ------------[ cut here ]------------
>> [ 7339.378576] WARNING: CPU: 49 PID: 2034647 at block/genhd.c:144 bdev_count_inflight+0x7c/0x90
>> [ 7339.382933] Modules linked in:
>> [ 7339.385169] CPU: 49 UID: 0 PID: 2034647 Comm: xfs_repair Not tainted 6.16.0-rc3-dgc+ #342 PREEMPT(full)
>> [ 7339.390668] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
>> [ 7339.396211] RIP: 0010:bdev_count_inflight+0x7c/0x90
>> [ 7339.399196] Code: ff 48 8b 94 16 90 00 00 00 01 d3 48 ff c0 eb bc 45 85 ff 78 15 85 db 78 1a 44 01 fb 89 d8 5b 41 5e 41 5f 5d c3 cc cc cc cc cc <0f> 0b 45 31 ff 85 db 79 e6 0f 0b 31 db eb e0 0f 1f 44 00 00 90 90
>> [ 7339.409039] RSP: 0018:ffffc900100bf978 EFLAGS: 00010286
>> [ 7339.412126] RAX: 0000000000000040 RBX: 0000000000000000 RCX: 0000000000000040
>> [ 7339.417910] RDX: 0000000000000040 RSI: 0000000000000040 RDI: ffffffff82f911c8
>> [ 7339.421923] RBP: ffffc900100bf990 R08: 0000000000000c00 R09: ffff889878c81400
>> [ 7339.425940] R10: 0000000000000000 R11: ffffffff823dc150 R12: 00000001006b668c
>> [ 7339.433641] R13: ffff889849c98600 R14: ffff889849c98600 R15: 00000000ffffffff
>> [ 7339.437308] FS:  00007f383ad55680(0000) GS:ffff88a09a4b1000(0000) knlGS:0000000000000000
>> [ 7339.441577] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 7339.444716] CR2: 00007f3820000020 CR3: 0000001886ec6000 CR4: 0000000000350ef0
>> [ 7339.447851] Call Trace:
>> [ 7339.449436]  <TASK>
>> [ 7339.450683]  bdev_start_io_acct+0x58/0xc0
>> [ 7339.452661]  dm_io_acct+0x60/0x100
>> [ 7339.454471]  dm_submit_bio_remap+0x4f/0x100
>> [ 7339.456592]  __map_bio+0x125/0x260
>> [ 7339.458423]  dm_submit_bio+0x562/0xd70
>> [ 7339.459996]  ? kmem_cache_alloc_noprof+0x188/0x320
>> [ 7339.462501]  ? __blk_flush_plug+0xe6/0x140
>> [ 7339.464613]  __submit_bio+0x12c/0x210
>> [ 7339.467010]  submit_bio_noacct_nocheck+0x12e/0x2a0
>> [ 7339.469166]  ? iov_iter_extract_pages+0x152/0x220
>> [ 7339.476238]  submit_bio_noacct+0x2fd/0x380
>> [ 7339.478354]  submit_bio+0xe5/0xf0
>> [ 7339.480182]  submit_bio_wait+0x54/0xc0
>> [ 7339.481722]  blkdev_direct_IO+0x415/0x480
>> [ 7339.483977]  ? __pfx_submit_bio_wait_endio+0x10/0x10
>> [ 7339.487079]  blkdev_read_iter+0x9d/0x170
>> [ 7339.494123]  vfs_read+0x269/0x2f0
>> [ 7339.494131]  __x64_sys_pread64+0x71/0xc0
>> [ 7339.494134]  x64_sys_call+0x28ca/0x2f60
>> [ 7339.498789]  do_syscall_64+0x6b/0x1f0
>> [ 7339.498794]  ? exc_page_fault+0x70/0xa0
>> [ 7339.498798]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
>> [ 7339.505840] RIP: 0033:0x7f383dd039ee
>> [ 7339.505845] Code: 08 0f 85 f5 4b ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
>> [ 7339.505848] RSP: 002b:00007f383ad548e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
>> [ 7339.505851] RAX: ffffffffffffffda RBX: 00007f383ad55680 RCX: 00007f383dd039ee
>> [ 7339.505854] RDX: 0000000000000200 RSI: 000055f7bb191400 RDI: 0000000000000004
>> [ 7339.538888] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
>> [ 7339.541277] RBP: 0000000000000200 R08: 0000000000000000 R09: 0000000000000000
>> [ 7339.541282] R10: 000000001c200000 R11: 0000000000000246 R12: 00000000000e1000
>> [ 7339.544844]  49-....
>> [ 7339.548428] R13: 0000000000000001 R14: 00007f383ad54a60 R15: 000055f7bb186ae0
>> [ 7339.548433]  </TASK>
>>
> 
> Not a one-off. Just hit it again from fsx doing RWF_DONTCACHE IO,
> and given that I've never seen this until 6.16-rc3, it's probably a
> recent regression.
> 
>  ------------[ cut here ]------------
>  WARNING: CPU: 11 PID: 1137920 at block/genhd.c:146 bdev_count_inflight+0x85/0x90
>  Modules linked in:
>  CPU: 11 UID: 0 PID: 1137920 Comm: fsx Tainted: G        W           6.16.0-rc3-dgc+ #342 PREEMPT(full)
>  Tainted: [W]=WARN
>  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
>  RIP: 0010:bdev_count_inflight+0x85/0x90
>  Code: 01 d3 48 ff c0 eb bc 45 85 ff 78 15 85 db 78 1a 44 01 fb 89 d8 5b 41 5e 41 5f 5d c3 cc cc cc cc cc 0f 0b 45 31 ff 85 db 79 e6 <0f> 0b 31 db eb e0 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90
>  XFS (loop357): Mounting V5 Filesystem 8c4f5c6c-3a2b-402d-96ed-19ccc1845e50
>  RSP: 0018:ffffc9000d727700 EFLAGS: 00010286
>  RAX: 0000000000000040 RBX: 00000000ffffffff RCX: 0000000000000040
>  RDX: 0000000000000040 RSI: 0000000000000040 RDI: ffffffff82f911c8
>  RBP: ffffc9000d727718 R08: 00000000000003f0 R09: 000018795ca45f1b
>  R10: 0000000000000000 R11: ffffffff81328110 R12: 00000001015980ee
>  R13: 0000000000000000 R14: ffff88884400b000 R15: 0000000000000000
>  FS:  00007f5978c75740(0000) GS:ffff88889a731000(0000) knlGS:0000000000000000
>  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>  CR2: 000055c7311d1918 CR3: 00000009ac6b6000 CR4: 0000000000350ef0
>  Call Trace:
>   <TASK>
>   update_io_ticks+0x47/0x80
>   blk_account_io_start+0xd4/0x190
>   blk_mq_submit_bio+0x259/0x700
>   __submit_bio+0x99/0x210
>   submit_bio_noacct_nocheck+0xad/0x2a0
>   submit_bio_noacct+0x2fd/0x380
>   submit_bio+0xe5/0xf0
>   xfs_submit_ioend+0x9b/0xb0
>   iomap_writepages+0xaab/0xb40
>   xfs_vm_writepages+0x1b2/0x1e0
>   do_writepages+0xbf/0x1d0
>   filemap_fdatawrite_range_kick+0x84/0xb0
>   xfs_file_buffered_write+0x22d/0x290
>   xfs_file_write_iter+0x137/0x270
>   do_iter_readv_writev+0x190/0x1f0
>   vfs_writev+0x11a/0x350
>   __se_sys_pwritev2+0x6b/0xf0
>   __x64_sys_pwritev2+0x25/0x30
>   x64_sys_call+0x1d0c/0x2f60
>   do_syscall_64+0x6b/0x1f0
> 
>> I have no idea if it is reproducable - this is the first time I've
>> hit it. I've cc'd the DM list so they are aware of this, too.
> 
> Latest hit indicates that it has nothing to do with DM at all.
> 
> -Dave.


-- 
Damien Le Moal
Western Digital Research

Re: [WARN 6.16-rc3] warning in bdev_count_inflight()

[Damien Le Moal]

On 6/25/25 23:48, Damien Le Moal wrote:
> On 6/25/25 18:00, Dave Chinner wrote:
>> On Wed, Jun 25, 2025 at 06:26:14PM +1000, Dave Chinner wrote:
>>> Hi Jens,
>>>
>>> I had this warning fire on 6.16-rc3 whilst running fstests. I don't
>>> know what test caused it - I run 64 tests in parallel over a couple
>>> of hundred loop devices, so there's lots of stuff going on all the
>>> time.
>>>
>>> This warning fired when xfs_repair was running on some kind of DM
>>> device:
> 
> You are not alone seeing this one. Shin'ichiro saw it with blktests runs and
> other peoples have mentioned seeing it with various hardware as well. We have no
> reliable reproducer yet, and because it randomly shows up. So it is hard to
> debug. This is since 6.16-rc1 I think.

Ignore... I was not aware of the fix candidate :)

-- 
Damien Le Moal
Western Digital Research