Invalid wait context in umount

Invalid wait context in umount

[Shyam Prasad N]

I saw this during testing on the buildbot VM. Is someone here able to
make sense of it?

[Thu Mar 10 04:53:54 2022] =============================
[Thu Mar 10 04:53:54 2022] [ BUG: Invalid wait context ]
[Thu Mar 10 04:53:54 2022] 5.17.0-rc7 #1 Not tainted
[Thu Mar 10 04:53:54 2022] -----------------------------
[Thu Mar 10 04:53:54 2022] umount/1363 is trying to lock:
[Thu Mar 10 04:53:54 2022] ffff9239c3ac77d8
(&ret_buf->crfid.fid_mutex){+.+.}-{3:3}, at: cifs_kill_sb+0x66/0xc0
[cifs]
[Thu Mar 10 04:53:54 2022] other info that might help us debug this:
[Thu Mar 10 04:53:54 2022] context-{4:4}
[Thu Mar 10 04:53:54 2022] 2 locks held by umount/1363:
[Thu Mar 10 04:53:54 2022]  #0: ffff9239c3ac20e0
(&type->s_umount_key#55){+.+.}-{3:3}, at: deactivate_super+0x33/0x50
[Thu Mar 10 04:53:54 2022]  #1: ffff9239c33bee20
(&cifs_sb->tlink_tree_lock){+.+.}-{2:2}, at: cifs_kill_sb+0x41/0xc0
[cifs]
[Thu Mar 10 04:53:54 2022] stack backtrace:
[Thu Mar 10 04:53:54 2022] CPU: 5 PID: 1363 Comm: umount Not tainted
5.17.0-rc7 #1
[Thu Mar 10 04:53:54 2022] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[Thu Mar 10 04:53:54 2022] Call Trace:
[Thu Mar 10 04:53:54 2022]  <TASK>
[Thu Mar 10 04:53:54 2022]  dump_stack_lvl+0x58/0x71
[Thu Mar 10 04:53:54 2022]  __lock_acquire+0x6c9/0x18d0
[Thu Mar 10 04:53:54 2022]  ? lock_is_held_type+0xec/0x140
[Thu Mar 10 04:53:54 2022]  lock_acquire+0x267/0x330
[Thu Mar 10 04:53:54 2022]  ? cifs_kill_sb+0x66/0xc0 [cifs]
[Thu Mar 10 04:53:54 2022]  ? cifs_kill_sb+0x66/0xc0 [cifs]
[Thu Mar 10 04:53:54 2022]  __mutex_lock+0x80/0x900
[Thu Mar 10 04:53:54 2022]  ? cifs_kill_sb+0x66/0xc0 [cifs]
[Thu Mar 10 04:53:54 2022]  ? cifs_kill_sb+0x66/0xc0 [cifs]
[Thu Mar 10 04:53:54 2022]  cifs_kill_sb+0x66/0xc0 [cifs]
[Thu Mar 10 04:53:54 2022]  deactivate_locked_super+0x3a/0x70
[Thu Mar 10 04:53:54 2022]  cleanup_mnt+0xb8/0x150
[Thu Mar 10 04:53:54 2022]  task_work_run+0x6a/0xa0
[Thu Mar 10 04:53:54 2022]  exit_to_user_mode_prepare+0x2a2/0x2b0
[Thu Mar 10 04:53:54 2022]  syscall_exit_to_user_mode+0x2c/0x60
[Thu Mar 10 04:53:54 2022]  do_syscall_64+0x46/0x80
[Thu Mar 10 04:53:54 2022]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[Thu Mar 10 04:53:54 2022] RIP: 0033:0x7f6cb771a54b
[Thu Mar 10 04:53:54 2022] Code: 29 0c 00 f7 d8 64 89 01 48 83 c8 ff
c3 66 90 f3 0f 1e fa 31 f6 e9 05 00 00 00 0f 1f 44 00 00 f3 0f 1e fa
b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 0d 29 0c 00
f7 d8 64 89 01 48
[Thu Mar 10 04:53:54 2022] RSP: 002b:00007ffd96646e68 EFLAGS: 00000246
ORIG_RAX: 00000000000000a6
[Thu Mar 10 04:53:54 2022] RAX: 0000000000000000 RBX: 000056294dd2f970
RCX: 00007f6cb771a54b
[Thu Mar 10 04:53:54 2022] RDX: 0000000000000001 RSI: 0000000000000000
RDI: 000056294dd37780
[Thu Mar 10 04:53:54 2022] RBP: 0000000000000000 R08: 0000000000000000
R09: 0000000000000002
[Thu Mar 10 04:53:54 2022] R10: 000056294dd2f010 R11: 0000000000000246
R12: 000056294dd37780
[Thu Mar 10 04:53:54 2022] R13: 00007f6cb78d11a4 R14: 000056294dd2fb50
R15: 00007ffd966470d8
[Thu Mar 10 04:53:54 2022]  </TASK>


-- 
Regards,
Shyam