[Bug 277389] Reproduceable low memory freeze on 14.0-RELEASE-p5

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277389

--- Comment #5 from pascal.guitierrez@gmail.com ---
(In reply to Vladimir Druzenko from comment #4)

cat /boot/loader.conf.local 
vfs.zfs.arc_max=2147483648

sysctl vfs.zfs.arc_max
vfs.zfs.arc_max: 2147483648

run iozone -i 1 -l 512 -r 4k -s 1g


and after about 10 minutes results in (see system uptime below from top):

last pid: 86521;  load averages:  0.39,  3.97,  4.10                           
                                     up 0+00:11:32  08:38:00
544 processes: 1 running, 542 sleeping, 1 waiting
CPU:  0.2% user,  0.0% nice,  4.4% system,  0.0% interrupt, 95.4% idle
Mem: 2316K Active, 4096B Inact, 15G Wired, 41M Free
ARC: 14G Total, 152M MFU, 14G MRU, 38M Header, 2147K Other
     14G Compressed, 14G Uncompressed, 1.01:1 Ratio

system has frozen due to OOM

interestingly for the first part of the iozone test, the ARC does seem to
honour the arc_max, hovering around the 2GB value for some time, then suddenly
the memory usage exceeds arc_max and is on the path to OOM.

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