Re: CURRENT (after commit b1f72dd2a9a5e69a310b9e76b55f16cff433b8da): silently crashing when make -jXX buildworld

On Sat, Mar 21, 2026 at 11:58:39AM +0100, Herbert J. Skuhra wrote:
> On Sat, 21 Mar 2026, at 09:30, A FreeBSD User wrote:
> > Hello,
> >
> > after upgrading sources and recompiling averything from scratch after 
> > make cleanworld, host is
> > silently rebooting (not trace of a crash or anything suitable to 
> > present).
> ...
> I guess this is caused by e90950627327de9226b052851b36f341bc72b746.
> /var/log/messages shows:
> Mar 21 11:38:08 srv03 kernel: Fatal trap 9: general protection fault while in kernel mode
> Mar 21 11:38:08 srv03 kernel: 
> Mar 21 11:38:08 srv03 syslogd: last message repeated 4 times
> Mar 21 11:38:08 srv03 kernel: cpuid = 5; apic id = 05
> Mar 21 11:38:08 srv03 kernel: 
> Mar 21 11:38:08 srv03 kernel: Fatal trap 9: general protection fault while in kernel mode
> Mar 21 11:38:08 srv03 syslogd: last message repeated 1 times
> ....

What I find (after the update to main-n284608-b1f72dd2a9a5, rebooting, &
crashing) in messages appears to be a little different:

...
Mar 21 11:27:02 freebeast kernel: Security policy loaded: MAC/ntpd (mac_ntpd)
Mar 21 11:27:02 freebeast kernel: GEOM_ELI: Device ada0s4b.eli created.
Mar 21 11:27:02 freebeast kernel: GEOM_ELI: Encryption: AES-XTS 128
Mar 21 11:27:02 freebeast kernel: GEOM_ELI:     Crypto: accelerated software
Mar 21 11:27:35 freebeast kernel: Kernel page fault with the following non-sleepable locks held:
Mar 21 11:27:35 freebeast kernel: exclusive sleep mutex sigacts (sigacts) r = 0 (0xfffff8209f0a3ca8) locked @ /usr/src/sys/kern/kern_sig.c:311
Mar 21 11:27:35 freebeast kernel: exclusive sleep mutex process lock (process lock) r = 0 (0xfffffe04de855138) locked @ /usr/src/sys/kern/kern_sig.c:308
Mar 21 11:27:35 freebeast kernel: stack backtrace:
Mar 21 11:27:35 freebeast kernel: #0 0xffffffff80c4407c at witness_debugger+0x6c
Mar 21 11:27:35 freebeast kernel: #1 0xffffffff80c45989 at witness_warn+0x4c9
Mar 21 11:27:35 freebeast kernel: #2 0xffffffff8112acec at trap_pfault+0x8c
Mar 21 11:27:35 freebeast kernel: #3 0xffffffff810f9ae8 at calltrap+0x8
Mar 21 11:31:19 freebeast syslogd: kernel boot file is /boot/kernel.old/kernel
Mar 21 11:31:19 freebeast kernel: ---<<BOOT>>---
....

The machine did reboot without my intervention (and as may be seen
above, I chose kernel.old so I could poke around).  Unfortunately,
there was no crash dump, and (as far as I could tell on the serial
console), there was no drop to ddb.

Peace,
david
-- 
David H. Wolfskill                              [email protected]

See https://www.catwhisker.org/~david/publickey.gpg for my public key.

-----BEGIN PGP SIGNATURE-----

iNUEARYKAH0WIQRCec5RsK7Enudh3yGB9MJ9AwUELQUCab6D9l8UgAAAAAAuAChp
c3N1ZXItZnByQG5vdGF0aW9ucy5vcGVucGdwLmZpZnRoaG9yc2VtYW4ubmV0NDI3
OUNFNTFCMEFFQzQ5RUU3NjFERjIxODFGNEMyN0QwMzA1MDQyRAAKCRCB9MJ9AwUE
LRjGAQCcY11BKJvwjXgKJnphXfHvIf57tig/5wWNkoxkHAJNzAEAxoXjjbSLeTcg
BPTnNw846f2Kvusn6izhrVR5Up/+EA0=
=o3iX
-----END PGP SIGNATURE-----