Hour-long sleeps in the ZFS write throttle: fix for 13.1 ?

Reply: Warner Losh : "Re: Hour-long sleeps in the ZFS write throttle: fix for 13.1 ?"
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From: Alan Somers <asomers_at_freebsd.org>
Date: Tue, 05 Apr 2022 21:05:25 UTC

All year long I've occasionally seen my ZFS processes get blocked in
dmu_tx_wait.  They stay blocked for more than an hour but eventually
recover.  I finally found the cause: an integer overflow bug in
ustosbt.  The fix is simple enough, but my question is: should we try
to commit this in time for 13.1-RELEASE?  It's a very disruptive bug,
but also very hard to trigger.  It takes a pretty highly congested ZFS
system to trigger it.  In theory the bug could affect other
subsystems, too.

https://github.com/openzfs/zfs/issues/13289
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263073