[Bug 214767] xfs seems to hang due to race condition? maybe related to (gratuitous) thaw.

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214767

--- Comment #2 from Christian Theune (ct@flyingcircus.io) ---
Here's another excerpt that I dug out from a different VM with the same issue.
No thawing happening AFAICT around this time:

[848865.353541] INFO: task nix-daemon:1855245 blocked for more than 122
seconds.
[848865.355625]       Not tainted 5.10.70 #1-NixOS
[848865.356912] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[848865.359117] task:nix-daemon      state:D stack:    0 pid:1855245 ppid: 
2165 flags:0x00000000
[848865.360999] Call Trace:
[848865.361480]  __schedule+0x271/0x860
[848865.362069]  schedule+0x46/0xb0
[848865.362657]  xfs_log_commit_cil+0x6a4/0x800 [xfs]
[848865.363436]  ? wake_up_q+0xa0/0xa0
[848865.364026]  __xfs_trans_commit+0x9d/0x310 [xfs]
[848865.364818]  xfs_create+0x472/0x560 [xfs]
[848865.365517]  xfs_generic_create+0x247/0x320 [xfs]
[848865.366310]  ? xfs_lookup+0x55/0x100 [xfs]
[848865.366984]  path_openat+0xdd7/0x1070
[848865.367617]  do_filp_open+0x88/0x130
[848865.368199]  ? getname_flags.part.0+0x29/0x1a0
[848865.368925]  do_sys_openat2+0x97/0x150
[848865.369557]  __x64_sys_openat+0x54/0x90
[848865.370176]  do_syscall_64+0x33/0x40
[848865.370787]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[848865.371619] RIP: 0033:0x7f48b24c0ea8
[848865.372196] RSP: 002b:00007ffed91cee30 EFLAGS: 00000293 ORIG_RAX:
0000000000000101
[848865.373398] RAX: ffffffffffffffda RBX: 00000000000800c1 RCX:
00007f48b24c0ea8
[848865.374530] RDX: 00000000000800c1 RSI: 00000000015c4750 RDI:
00000000ffffff9c
[848865.375661] RBP: 00000000015c4750 R08: 0000000000000000 R09:
0000000000000003
[848865.376790] R10: 00000000000001b6 R11: 0000000000000293 R12:
00007ffed91cf220
[848865.377920] R13: 00007ffed91ceee0 R14: 00007ffed91ceed0 R15:
00007ffed91d0c50

and I can see it not making any progress:

[848988.235884] INFO: task nix-daemon:1855245 blocked for more than 245
seconds.
[848988.238567]       Not tainted 5.10.70 #1-NixOS
[848988.240254] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[848988.242358] task:nix-daemon      state:D stack:    0 pid:1855245 ppid: 
2165 flags:0x00000000
[848988.243756] Call Trace:
[848988.244183]  __schedule+0x271/0x860
[848988.244780]  schedule+0x46/0xb0
[848988.245366]  xfs_log_commit_cil+0x6a4/0x800 [xfs]
[848988.246153]  ? wake_up_q+0xa0/0xa0
[848988.246775]  __xfs_trans_commit+0x9d/0x310 [xfs]
[848988.247572]  xfs_create+0x472/0x560 [xfs]
[848988.248269]  xfs_generic_create+0x247/0x320 [xfs]
[848988.249084]  ? xfs_lookup+0x55/0x100 [xfs]
[848988.249781]  path_openat+0xdd7/0x1070
[848988.250388]  do_filp_open+0x88/0x130
[848988.251000]  ? getname_flags.part.0+0x29/0x1a0
[848988.251746]  do_sys_openat2+0x97/0x150
[848988.252366]  __x64_sys_openat+0x54/0x90
[848988.253015]  do_syscall_64+0x33/0x40
[848988.253610]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[848988.254445] RIP: 0033:0x7f48b24c0ea8
[848988.255071] RSP: 002b:00007ffed91cee30 EFLAGS: 00000293 ORIG_RAX:
0000000000000101
[848988.256292] RAX: ffffffffffffffda RBX: 00000000000800c1 RCX:
00007f48b24c0ea8
[848988.257460] RDX: 00000000000800c1 RSI: 00000000015c4750 RDI:
00000000ffffff9c
[848988.258622] RBP: 00000000015c4750 R08: 0000000000000000 R09:
0000000000000003
[848988.259777] R10: 00000000000001b6 R11: 0000000000000293 R12:
00007ffed91cf220
[848988.260933] R13: 00007ffed91ceee0 R14: 00007ffed91ceed0 R15:
00007ffed91d0c50

Both stack traces are identical in every regard so that might be useful info.

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