witness_lock_list_get: witness exhausted

First shame on me as I obviously missed the reply to my former report and did not
report back on a proposed patch.

https://lists.freebsd.org/pipermail/freebsd-current/2018-January/068136.html

I am still running current – the guest has 160GB Ram and 64 vCPU’s assigned under ESXi
which mainly runs poudriere for amd64+arm builds and I again noticed
"witness_lock_list_get: witness exhausted" on the console (which I don't pay much attention to).

UNAME: FreeBSD poudriere.gopai.com 14.0-CURRENT FreeBSD 14.0-CURRENT #0 main-n259872-f948cb717f50: Wed Dec 28 13:13:43 EST 2022     mikej@poudriere.gopai.com:/usr/obj/usr/src/amd64.amd64/sys/GENERIC amd64

It seems that LOCK_NCHILDREN and LOCK_CHILDCOUNT never got incremented due to my lack of reporting in
/usr/src/sys/kern/subr_witness.c

If it's just a matter of incrementing LOCK_CHIDCOUNT 4096 and LOCK_NCHILDREN 20 without adding the
sysctl knobs I do that also - I am not kernel savvy.

I will make sure and test an updated patch should one be made available or advise whether to increment these values
or ignore the warnings.

Regards,

Michael Jung





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