Re: stop using buffer heads in xfs and iomap

On Wed, May 09, 2018 at 09:47:57AM +0200, Christoph Hellwig wrote:

Hi all,

this series adds support for reading blocks from disk using the iomap
interface, and then gradually switched the buffered I/O path to not
require buffer heads.  It has survived xfstests for 1k and 4k block
size.

There are various small changes to the core VFS, block and readahead
code to make this happen.


A git tree is available at:

    git://git.infradead.org/users/hch/xfs.git xfs-remove-bufferheads

Gitweb:

    http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/xfs-remove-bufferheads

I ran xfstests on this for fun last night but hung in g/095:

FSTYP         -- xfs (debug)
PLATFORM      -- Linux/x86_64 submarine-djwong-mtr01 4.17.0-rc4-djw
MKFS_OPTIONS  -- -f -m reflink=1,rmapbt=1, -i sparse=1, -b size=1024, /dev/sdf
MOUNT_OPTIONS -- /dev/sdf /opt

FWIW the stock v4 and the 'v5 with everything and 4k blocks' vms
passed, so I guess there's a bug somewhere in the sub-page block size
code paths...

--D

[ 2586.943205] run fstests generic/095 at 2018-05-09 23:28:01
[ 2587.252740] XFS (sdf): Unmounting Filesystem
[ 2587.908441] XFS (sdf): Mounting V5 Filesystem
[ 2587.914685] XFS (sdf): Ending clean mount
[ 2702.258764] INFO: task kworker/u10:3:11834 blocked for more than 60 seconds.
[ 2702.261734]       Tainted: G        W         4.17.0-rc4-djw #2
[ 2702.263607] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 2702.265600] kworker/u10:3   D11984 11834      2 0x80000000
[ 2702.273445] Workqueue: writeback wb_workfn (flush-8:80)
[ 2702.274751] Call Trace:
[ 2702.275339]  ? __schedule+0x3e4/0xa70
[ 2702.276112]  ? blk_flush_plug_list+0xe4/0x280
[ 2702.277086]  schedule+0x40/0x90
[ 2702.277967]  io_schedule+0x16/0x40
[ 2702.278774]  __lock_page+0x12d/0x160
[ 2702.279680]  ? page_cache_tree_insert+0x100/0x100
[ 2702.280712]  write_cache_pages+0x32c/0x530
[ 2702.281820]  ? xfs_add_to_ioend+0x350/0x350 [xfs]
[ 2702.292350]  xfs_vm_writepages+0x57/0x80 [xfs]
[ 2702.294048]  do_writepages+0x1a/0x70
[ 2702.295068]  __writeback_single_inode+0x59/0x800
[ 2702.296118]  writeback_sb_inodes+0x282/0x550
[ 2702.297039]  __writeback_inodes_wb+0x87/0xb0
[ 2702.298173]  wb_writeback+0x430/0x5d0
[ 2702.299332]  ? wb_workfn+0x448/0x740
[ 2702.300578]  wb_workfn+0x448/0x740
[ 2702.301434]  ? lock_acquire+0xab/0x200
[ 2702.305413]  process_one_work+0x1ef/0x650
[ 2702.306687]  worker_thread+0x4d/0x3e0
[ 2702.307671]  kthread+0x106/0x140
[ 2702.308473]  ? rescuer_thread+0x340/0x340
[ 2702.309442]  ? kthread_delayed_work_timer_fn+0x90/0x90
[ 2702.310995]  ret_from_fork+0x3a/0x50
[ 2702.312088] INFO: task fio:2618 blocked for more than 60 seconds.
[ 2702.313395]       Tainted: G        W         4.17.0-rc4-djw #2
[ 2702.315139] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 2702.316820] fio             D14224  2618   2612 0x00000000
[ 2702.318050] Call Trace:
[ 2702.318757]  ? __schedule+0x3e4/0xa70
[ 2702.319639]  ? rwsem_down_read_failed+0x7f/0x170
[ 2702.320798]  schedule+0x40/0x90
[ 2702.321630]  rwsem_down_read_failed+0x128/0x170
[ 2702.322752]  ? current_time+0x18/0x70
[ 2702.323857]  ? xfs_file_dio_aio_read+0x6d/0x1c0 [xfs]
[ 2702.325162]  ? call_rwsem_down_read_failed+0x14/0x30
[ 2702.326423]  call_rwsem_down_read_failed+0x14/0x30
[ 2702.328393]  ? xfs_ilock+0x28f/0x330 [xfs]
[ 2702.329539]  down_read_nested+0x9d/0xa0
[ 2702.330452]  xfs_ilock+0x28f/0x330 [xfs]
[ 2702.331427]  xfs_file_dio_aio_read+0x6d/0x1c0 [xfs]
[ 2702.332590]  xfs_file_read_iter+0x9a/0xb0 [xfs]
[ 2702.333992]  __vfs_read+0x136/0x1a0
[ 2702.335133]  vfs_read+0xa3/0x150
[ 2702.336129]  ksys_read+0x45/0xa0
[ 2702.337085]  do_syscall_64+0x56/0x180
[ 2702.337985]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 2702.339537] RIP: 0033:0x7ff4c152751d
[ 2702.340623] RSP: 002b:00007fffa13c93b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000000
[ 2702.342774] RAX: ffffffffffffffda RBX: 0000000000a0a2c0 RCX: 00007ff4c152751d
[ 2702.344269] RDX: 0000000000000400 RSI: 0000000000a17c00 RDI: 0000000000000005
[ 2702.345801] RBP: 00007ff4a6f57000 R08: 0800000000002000 R09: 0000000000000004
[ 2702.347342] R10: 0000000000000001 R11: 0000000000000293 R12: 0000000000000000
[ 2702.348861] R13: 0000000000000400 R14: 0000000000a0a2e8 R15: 00007ff4a6f57000
[ 2702.351298] INFO: task fio:2619 blocked for more than 60 seconds.
[ 2702.353158]       Tainted: G        W         4.17.0-rc4-djw #2
[ 2702.355103] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 2702.357586] fio             D14224  2619   2612 0x00000000
[ 2702.359181] Call Trace:
[ 2702.359815]  ? __schedule+0x3e4/0xa70
[ 2702.360708]  ? rwsem_down_read_failed+0x7f/0x170
[ 2702.361880]  schedule+0x40/0x90
[ 2702.362727]  rwsem_down_read_failed+0x128/0x170
[ 2702.363811]  ? current_time+0x18/0x70
[ 2702.364775]  ? xfs_file_dio_aio_read+0x6d/0x1c0 [xfs]
[ 2702.365994]  ? call_rwsem_down_read_failed+0x14/0x30
[ 2702.367217]  call_rwsem_down_read_failed+0x14/0x30
[ 2702.368411]  ? xfs_ilock+0x28f/0x330 [xfs]
[ 2702.369445]  down_read_nested+0x9d/0xa0
[ 2702.370420]  xfs_ilock+0x28f/0x330 [xfs]
[ 2702.371454]  xfs_file_dio_aio_read+0x6d/0x1c0 [xfs]
[ 2702.372665]  xfs_file_read_iter+0x9a/0xb0 [xfs]
[ 2702.373780]  __vfs_read+0x136/0x1a0
[ 2702.374708]  vfs_read+0xa3/0x150
[ 2702.375521]  ksys_read+0x45/0xa0
[ 2702.376318]  do_syscall_64+0x56/0x180
[ 2702.377207]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 2702.378839] RIP: 0033:0x7ff4c152751d
[ 2702.379625] RSP: 002b:00007fffa13c93b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000000
[ 2702.381190] RAX: ffffffffffffffda RBX: 0000000000a0a2c0 RCX: 00007ff4c152751d
[ 2702.382720] RDX: 0000000000000400 RSI: 0000000000a17c00 RDI: 0000000000000005
[ 2702.384575] RBP: 00007ff4a6f66b48 R08: 1000000000020000 R09: 0000000000000004
[ 2702.386233] R10: 0000000000000001 R11: 0000000000000293 R12: 0000000000000000
[ 2702.387928] R13: 0000000000000400 R14: 0000000000a0a2e8 R15: 00007ff4a6f66b48
[ 2702.389643] INFO: task fio:2620 blocked for more than 60 seconds.
[ 2702.391114]       Tainted: G        W         4.17.0-rc4-djw #2
[ 2702.393061] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 2702.395659] fio             D14224  2620   2612 0x00000000
[ 2702.397589] Call Trace:
[ 2702.398474]  ? __schedule+0x3e4/0xa70
[ 2702.399445]  ? rwsem_down_read_failed+0x7f/0x170
[ 2702.400590]  schedule+0x40/0x90
[ 2702.401753]  rwsem_down_read_failed+0x128/0x170
[ 2702.402902]  ? current_time+0x18/0x70
[ 2702.403874]  ? xfs_file_dio_aio_read+0x6d/0x1c0 [xfs]
[ 2702.405080]  ? call_rwsem_down_read_failed+0x14/0x30
[ 2702.406597]  call_rwsem_down_read_failed+0x14/0x30
[ 2702.407918]  ? xfs_ilock+0x28f/0x330 [xfs]
[ 2702.409035]  down_read_nested+0x9d/0xa0
[ 2702.410284]  xfs_ilock+0x28f/0x330 [xfs]
[ 2702.411697]  xfs_file_dio_aio_read+0x6d/0x1c0 [xfs]
[ 2702.413413]  xfs_file_read_iter+0x9a/0xb0 [xfs]
[ 2702.414658]  __vfs_read+0x136/0x1a0
[ 2702.415855]  vfs_read+0xa3/0x150
[ 2702.416789]  ksys_read+0x45/0xa0
[ 2702.417956]  do_syscall_64+0x56/0x180
[ 2702.419108]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 2702.420636] RIP: 0033:0x7ff4c152751d
[ 2702.421861] RSP: 002b:00007fffa13c93b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000000
[ 2702.424332] RAX: ffffffffffffffda RBX: 0000000000a0a2c0 RCX: 00007ff4c152751d
[ 2702.426572] RDX: 0000000000000400 RSI: 0000000000a17c00 RDI: 0000000000000005
[ 2702.428719] RBP: 00007ff4a6f76690 R08: 0001000000000000 R09: 0000000000000004
[ 2702.430587] R10: 0000000000000001 R11: 0000000000000293 R12: 0000000000000000
[ 2702.432113] R13: 0000000000000400 R14: 0000000000a0a2e8 R15: 00007ff4a6f76690
[ 2702.433608] INFO: task fio:2621 blocked for more than 60 seconds.
[ 2702.434932]       Tainted: G        W         4.17.0-rc4-djw #2
[ 2702.436202] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 2702.437846] fio             D14272  2621   2612 0x00000000
[ 2702.439057] Call Trace:
[ 2702.439633]  ? __schedule+0x3e4/0xa70
[ 2702.440438]  ? rwsem_down_read_failed+0x7f/0x170
[ 2702.441443]  schedule+0x40/0x90
[ 2702.442149]  rwsem_down_read_failed+0x128/0x170
[ 2702.443199]  ? xfs_file_dio_aio_read+0x6d/0x1c0 [xfs]
[ 2702.444275]  ? call_rwsem_down_read_failed+0x14/0x30
[ 2702.445315]  call_rwsem_down_read_failed+0x14/0x30
[ 2702.446370]  ? xfs_ilock+0x28f/0x330 [xfs]
[ 2702.447300]  down_read_nested+0x9d/0xa0
[ 2702.448172]  xfs_ilock+0x28f/0x330 [xfs]
[ 2702.449059]  xfs_file_dio_aio_read+0x6d/0x1c0 [xfs]
[ 2702.450166]  xfs_file_read_iter+0x9a/0xb0 [xfs]
[ 2702.451204]  __vfs_read+0x136/0x1a0
[ 2702.451991]  vfs_read+0xa3/0x150
[ 2702.452715]  ksys_read+0x45/0xa0
[ 2702.453462]  do_syscall_64+0x56/0x180
[ 2702.454277]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 2702.455406] RIP: 0033:0x7ff4c152751d
[ 2702.456206] RSP: 002b:00007fffa13c93b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000000
[ 2702.457820] RAX: ffffffffffffffda RBX: 0000000000a0a2c0 RCX: 00007ff4c152751d
[ 2702.459361] RDX: 0000000000000400 RSI: 0000000000a17c00 RDI: 0000000000000005
[ 2702.460871] RBP: 00007ff4a6f861d8 R08: 0000000000800000 R09: 0000000000000004
[ 2702.462366] R10: 0000000000000001 R11: 0000000000000293 R12: 0000000000000000
[ 2702.463863] R13: 0000000000000400 R14: 0000000000a0a2e8 R15: 00007ff4a6f861d8
[ 2702.465332] INFO: task fio:2622 blocked for more than 60 seconds.
[ 2702.466634]       Tainted: G        W         4.17.0-rc4-djw #2
[ 2702.467880] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 2702.469534] fio             D14296  2622   2612 0x00000000
[ 2702.470742] Call Trace:
[ 2702.471312]  ? __schedule+0x3e4/0xa70
[ 2702.472116]  ? rwsem_down_read_failed+0x7f/0x170
[ 2702.473115]  schedule+0x40/0x90
[ 2702.473831]  rwsem_down_read_failed+0x128/0x170
[ 2702.474911]  ? xfs_file_dio_aio_read+0x6d/0x1c0 [xfs]
[ 2702.476014]  ? call_rwsem_down_read_failed+0x14/0x30
[ 2702.477085]  call_rwsem_down_read_failed+0x14/0x30
[ 2702.478171]  ? xfs_ilock+0x28f/0x330 [xfs]
[ 2702.479114]  down_read_nested+0x9d/0xa0
[ 2702.479999]  xfs_ilock+0x28f/0x330 [xfs]
[ 2702.481052]  xfs_file_dio_aio_read+0x6d/0x1c0 [xfs]
[ 2702.482155]  xfs_file_read_iter+0x9a/0xb0 [xfs]
[ 2702.483461]  __vfs_read+0x136/0x1a0
[ 2702.484542]  vfs_read+0xa3/0x150
[ 2702.485512]  ksys_read+0x45/0xa0
[ 2702.486458]  do_syscall_64+0x56/0x180
[ 2702.487597]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 2702.489099] RIP: 0033:0x7ff4c152751d
[ 2702.490149] RSP: 002b:00007fffa13c93b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000000
[ 2702.492324] RAX: ffffffffffffffda RBX: 0000000000a0a2c0 RCX: 00007ff4c152751d
[ 2702.494580] RDX: 0000000000000400 RSI: 0000000000a17c00 RDI: 0000000000000005
[ 2702.496814] RBP: 00007ff4a6f95d20 R08: 0400000000000000 R09: 0000000000000004
[ 2702.498931] R10: 0000000000000001 R11: 0000000000000293 R12: 0000000000000000
[ 2702.501035] R13: 0000000000000400 R14: 0000000000a0a2e8 R15: 00007ff4a6f95d20
[ 2702.503181] INFO: task fio:2623 blocked for more than 60 seconds.
[ 2702.504980]       Tainted: G        W         4.17.0-rc4-djw #2
[ 2702.506658] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 2702.508464] fio             D14240  2623   2612 0x00000000
[ 2702.509927] Call Trace:
[ 2702.510802]  ? __schedule+0x3e4/0xa70
[ 2702.511832]  ? blk_flush_plug_list+0xe4/0x280
[ 2702.512872]  schedule+0x40/0x90
[ 2702.513782]  rwsem_down_read_failed+0x128/0x170
[ 2702.515267]  ? xfs_file_dio_aio_write+0xa8/0x470 [xfs]
[ 2702.516814]  ? call_rwsem_down_read_failed+0x14/0x30
[ 2702.518340]  call_rwsem_down_read_failed+0x14/0x30
[ 2702.520179]  ? xfs_ilock+0x28f/0x330 [xfs]
[ 2702.521639]  down_read_nested+0x9d/0xa0
[ 2702.522945]  xfs_ilock+0x28f/0x330 [xfs]
[ 2702.524196]  xfs_file_dio_aio_write+0xa8/0x470 [xfs]
[ 2702.525682]  xfs_file_write_iter+0x7b/0xb0 [xfs]
[ 2702.527109]  aio_write+0x133/0x1c0
[ 2702.528170]  ? lock_acquire+0xab/0x200
[ 2702.529282]  ? __might_fault+0x36/0x80
[ 2702.530421]  ? do_io_submit+0x41b/0x8d0
[ 2702.531617]  do_io_submit+0x41b/0x8d0
[ 2702.532758]  ? do_syscall_64+0x56/0x180
[ 2702.533950]  ? do_io_submit+0x8d0/0x8d0
[ 2702.535053]  do_syscall_64+0x56/0x180
[ 2702.536048]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 2702.537236] RIP: 0033:0x7ff4c1c57697
[ 2702.538382] RSP: 002b:00007fffa13c9348 EFLAGS: 00000212 ORIG_RAX: 00000000000000d1
[ 2702.540538] RAX: ffffffffffffffda RBX: 0000000000a0a440 RCX: 00007ff4c1c57697
[ 2702.553411] RDX: 0000000000a08320 RSI: 0000000000000008 RDI: 00007ff4a4ef7000
[ 2702.556112] RBP: 0000000000000000 R08: 0000000000000008 R09: 0000000000a097e0
[ 2702.559331] R10: 00000000000001f0 R11: 0000000000000212 R12: 00007ff4a6fa5868
[ 2702.562872] R13: 0000000000a0a480 R14: 0000000000000000 R15: 00007ff4a6fa5870
[ 2702.566224] INFO: task fio:2624 blocked for more than 60 seconds.
[ 2702.568916]       Tainted: G        W         4.17.0-rc4-djw #2
[ 2702.571389] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 2702.574938] fio             D14112  2624   2612 0x00000000
[ 2702.577412] Call Trace:
[ 2702.578442]  ? __schedule+0x3e4/0xa70
[ 2702.579995]  ? blk_flush_plug_list+0xe4/0x280
[ 2702.581662]  schedule+0x40/0x90
[ 2702.582905]  rwsem_down_read_failed+0x128/0x170
[ 2702.584628]  ? iomap_apply+0xd5/0x110
[ 2702.586113]  ? xfs_file_dio_aio_write+0xa8/0x470 [xfs]
[ 2702.588344]  ? call_rwsem_down_read_failed+0x14/0x30
[ 2702.590381]  call_rwsem_down_read_failed+0x14/0x30
[ 2702.592192]  ? xfs_ilock+0x28f/0x330 [xfs]
[ 2702.593850]  down_read_nested+0x9d/0xa0
[ 2702.595522]  xfs_ilock+0x28f/0x330 [xfs]
[ 2702.596803]  xfs_file_dio_aio_write+0xa8/0x470 [xfs]
[ 2702.598362]  xfs_file_write_iter+0x7b/0xb0 [xfs]
[ 2702.599758]  aio_write+0x133/0x1c0
[ 2702.600699]  ? lock_acquire+0xab/0x200
[ 2702.601902]  ? __might_fault+0x36/0x80
[ 2702.603056]  ? do_io_submit+0x41b/0x8d0
[ 2702.604191]  do_io_submit+0x41b/0x8d0
[ 2702.605368]  ? do_syscall_64+0x56/0x180
[ 2702.606499]  ? do_io_submit+0x8d0/0x8d0
[ 2702.607643]  do_syscall_64+0x56/0x180
[ 2702.608721]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 2702.610164] RIP: 0033:0x7ff4c1c57697
[ 2702.611202] RSP: 002b:00007fffa13c9348 EFLAGS: 00000212 ORIG_RAX: 00000000000000d1
[ 2702.613435] RAX: ffffffffffffffda RBX: 0000000000a0a440 RCX: 00007ff4c1c57697
[ 2702.615344] RDX: 0000000000a08320 RSI: 0000000000000008 RDI: 00007ff4a4ef6000
[ 2702.617378] RBP: 0000000000000000 R08: 0000000000000008 R09: 0000000000a097e0
[ 2702.619156] R10: 00000000000001f0 R11: 0000000000000212 R12: 00007ff4a6fb53b0
[ 2702.620699] R13: 0000000000a0a480 R14: 0000000000000000 R15: 00007ff4a6fb53b8
[ 2702.622672] INFO: task fio:2625 blocked for more than 60 seconds.
[ 2702.624119]       Tainted: G        W         4.17.0-rc4-djw #2
[ 2702.625533] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 2702.627422] fio             D14072  2625   2612 0x00000000
[ 2702.628745] Call Trace:
[ 2702.629393]  ? __schedule+0x3e4/0xa70
[ 2702.630308]  ? blk_flush_plug_list+0xe4/0x280
[ 2702.631402]  schedule+0x40/0x90
[ 2702.632191]  rwsem_down_read_failed+0x128/0x170
[ 2702.633428]  ? iomap_apply+0xd5/0x110
[ 2702.634418]  ? xfs_file_dio_aio_write+0xa8/0x470 [xfs]
[ 2702.635707]  ? call_rwsem_down_read_failed+0x14/0x30
[ 2702.636899]  call_rwsem_down_read_failed+0x14/0x30
[ 2702.638269]  ? xfs_ilock+0x28f/0x330 [xfs]
[ 2702.639300]  down_read_nested+0x9d/0xa0
[ 2702.640190]  xfs_ilock+0x28f/0x330 [xfs]
[ 2702.641091]  xfs_file_dio_aio_write+0xa8/0x470 [xfs]
[ 2702.642385]  xfs_file_write_iter+0x7b/0xb0 [xfs]
[ 2702.643624]  aio_write+0x133/0x1c0
[ 2702.644550]  ? lock_acquire+0xab/0x200
[ 2702.645443]  ? __might_fault+0x36/0x80
[ 2702.646404]  ? do_io_submit+0x41b/0x8d0
[ 2702.647924]  do_io_submit+0x41b/0x8d0
[ 2702.649437]  ? do_syscall_64+0x56/0x180
[ 2702.651040]  ? do_io_submit+0x8d0/0x8d0
[ 2702.652597]  do_syscall_64+0x56/0x180
[ 2702.654063]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 2702.655804] RIP: 0033:0x7ff4c1c57697
[ 2702.657254] RSP: 002b:00007fffa13c9348 EFLAGS: 00000212 ORIG_RAX: 00000000000000d1
[ 2702.660132] RAX: ffffffffffffffda RBX: 0000000000a12600 RCX: 00007ff4c1c57697
[ 2702.662115] RDX: 0000000000a08320 RSI: 0000000000000008 RDI: 00007ff4a4ef5000
[ 2702.663694] RBP: 0000000000000000 R08: 0000000000000008 R09: 0000000000a097e0
[ 2702.665239] R10: 00000000000001f0 R11: 0000000000000212 R12: 00007ff4a6fc4ef8
[ 2702.666850] R13: 0000000000a0a440 R14: 0000000000000000 R15: 00007ff4a6fc4f00
[ 2702.668419] INFO: task fio:2626 blocked for more than 60 seconds.
[ 2702.669747]       Tainted: G        W         4.17.0-rc4-djw #2
[ 2702.671300] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 2702.673099] fio             D13752  2626   2612 0x00000000
[ 2702.674841] Call Trace:
[ 2702.675719]  ? __schedule+0x3e4/0xa70
[ 2702.676960]  ? blk_flush_plug_list+0xe4/0x280
[ 2702.678387]  schedule+0x40/0x90
[ 2702.679383]  rwsem_down_read_failed+0x128/0x170
[ 2702.680667]  ? iomap_apply+0xd5/0x110
[ 2702.681779]  ? xfs_file_dio_aio_write+0xa8/0x470 [xfs]
[ 2702.683244]  ? call_rwsem_down_read_failed+0x14/0x30
[ 2702.684683]  call_rwsem_down_read_failed+0x14/0x30
[ 2702.686049]  ? xfs_ilock+0x28f/0x330 [xfs]
[ 2702.687279]  down_read_nested+0x9d/0xa0
[ 2702.688431]  xfs_ilock+0x28f/0x330 [xfs]
[ 2702.689521]  xfs_file_dio_aio_write+0xa8/0x470 [xfs]
[ 2702.690735]  xfs_file_write_iter+0x7b/0xb0 [xfs]
[ 2702.691848]  aio_write+0x133/0x1c0
[ 2702.692679]  ? lock_acquire+0xab/0x200
[ 2702.693565]  ? __might_fault+0x36/0x80
[ 2702.694557]  ? do_io_submit+0x41b/0x8d0
[ 2702.695626]  do_io_submit+0x41b/0x8d0
[ 2702.696461]  ? do_syscall_64+0x56/0x180
[ 2702.697327]  ? do_io_submit+0x8d0/0x8d0
[ 2702.698228]  do_syscall_64+0x56/0x180
[ 2702.699109]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 2702.700224] RIP: 0033:0x7ff4c1c57697
[ 2702.701060] RSP: 002b:00007fffa13c9348 EFLAGS: 00000212 ORIG_RAX: 00000000000000d1
[ 2702.703147] RAX: ffffffffffffffda RBX: 0000000000a0a440 RCX: 00007ff4c1c57697
[ 2702.704913] RDX: 0000000000a08320 RSI: 0000000000000008 RDI: 00007ff4a4ef4000
[ 2702.706747] RBP: 0000000000000000 R08: 0000000000000008 R09: 0000000000a097e0
[ 2702.708506] R10: 00000000000001f0 R11: 0000000000000212 R12: 00007ff4a6fd4a40
[ 2702.710047] R13: 0000000000a0a480 R14: 0000000000000000 R15: 00007ff4a6fd4a48
[ 2702.711685] INFO: lockdep is turned off.

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