[Bug 277671] 14-RELEASE/14-STABLE crash with heavy disk IO on AMD Asus x670e motherboard and Intel i225 (igc) breakage NIC non-functioning

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277671

--- Comment #6 from Vasyl S. <vasyl.samoilov@gmail.com> ---
I have this bug reproducing itself on at least two servers consistently. Right
now I'm had consistent reproduction of bug during make buildworld -j1  or -j2,
given that I have 4 non-multithreaded cores (intel n100 and pentium j5005). I
was able to rebuild world  with -j4 and downgrade to 13-stable, problem is
gone. 12-stable was working on same hardware without any problems for years.

The only common element seems to be 14-stable, zfs (zmirror) and really chaotic
i/o with significant amount of writes to busy zfs.

transmission during torrent download is writing a lot of (relatively large)
block, but in non-sequental manner. syncthing I am using for syncing a lot of
git repositories, which are periodically  re-scanned which generates a lot of
i/o (mostly read, but it makes hdd devices busy). building world in a single
thread also generates a significant amount of writes.

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