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

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

--- Comment #14 from Pedram Fard (pedram.fard@xxxxxxxxxx) ---
Here is the result of echo t > /proc/sysrq-trigger:

1 I root       578     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfsalloc]
1 I root       579     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs_mru_cache]
1 I root      1251     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-buf/nvme0n1]
1 I root      1252     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-conv/nvme0n]
1 I root      1253     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-cil/nvme0n1]
1 I root      1254     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-reclaim/nvm]
1 I root      1255     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-eofblocks/n]
1 I root      1256     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-log/nvme0n1]
1 S root      1257     2  0  80   0 -     0 -      Oct20 ?        00:02:06
[xfsaild/nvme0n1]
1 I root      1990     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-buf/dm-0]
1 I root      1991     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-conv/dm-0]
1 I root      1992     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-cil/dm-0]
1 I root      1993     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-reclaim/dm-]
1 I root      1994     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-eofblocks/d]
1 I root      1995     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-log/dm-0]
1 S root      1996     2  0  80   0 -     0 -      Oct20 ?        00:00:00
[xfsaild/dm-0]
1 I root      1999     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-buf/dm-1]
1 I root      2000     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-conv/dm-1]
1 I root      2001     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-cil/dm-1]
1 I root      2002     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-reclaim/dm-]
1 I root      2003     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-eofblocks/d]
1 I root      2004     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-log/dm-1]
1 S root      2005     2  0  80   0 -     0 -      Oct20 ?        00:01:53
[xfsaild/dm-1]
1 I root      2008     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-buf/dm-2]
1 I root      2009     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-conv/dm-2]
1 I root      2010     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-cil/dm-2]
1 I root      2011     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-reclaim/dm-]
1 I root      2012     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-eofblocks/d]
1 I root      2013     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-log/dm-2]
1 S root      2014     2  0  80   0 -     0 -      Oct20 ?        00:00:00
[xfsaild/dm-2]
0 S root      2226  1942  0  80   0 - 30496 -      17:41 ?        00:00:00
/bin/sh -f /usr/sbin/xfs_freeze -u /usr/local/appian
4 D root      2230  2226  0  80   0 - 29825 -      17:41 ?        00:00:00
/usr/sbin/xfs_io -F -r -p xfs_freeze -x -c thaw /usr/local/appian
1 I root      4068     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-buf/dm-3]
1 I root      4069     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-conv/dm-3]
1 I root      4070     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-cil/dm-3]
1 I root      4071     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-reclaim/dm-]
1 I root      4072     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-eofblocks/d]
1 I root      4073     2  0  60 -20 -     0 -      Oct20 ?        00:00:00
[xfs-log/dm-3]
1 S root      4074     2  0  80   0 -     0 -      Oct20 ?        00:02:01
[xfsaild/dm-3]
0 S root     10903 13809  0  80   0 - 29855 -      17:57 pts/0    00:00:00 grep
--color=auto xfs
1 I root     11221     2  0  80   0 -     0 -      17:44 ?        00:00:00
[kworker/1:4-xfs]
4 D root     22209     1  0  80   0 - 29825 -      16:08 ?        00:00:00
/usr/sbin/xfs_io -F -r -p xfs_freeze -x -c thaw /usr/local/appian
1 I root     23187     2  0  80   0 -     0 -      17:37 ?        00:00:00
[kworker/1:3-xfs]
1 I root     30083     2  0  80   0 -     0 -      17:29 ?        00:00:00
[kworker/1:1-xfs]

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