https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220184
--- Comment #18 from Chris Collins ---
Ok a further update.
After a reboot, the i5 750 machine started getting segfaults again, a few
reboots later I have discovered the behaviour is fairly consistent, where a
rolld o the dice occurs on a reboot, usually if the first buildworld has no
problem I can probably do 3+ in a row with no segfault, but if the first has a
segfault then I will struggle to get just one successful buildworld.
I discovered the LAPIC timer on my laptop is broken, aided by a warning on the
console, when I switched it to i8254 the problem stopped. I then fresh
installed 11.0 again and discovered on 11.0 it uses i8254 by default but on
11-STABLE it uses LAPIC, when LAPIC is used I see some other odd behaviours
e.g. systat -v 1 will update really slowly.
I then checked on my i5 750 on 11.0 it uses LAPIC by default and seems to work
ok, on 11-STABLE LAPIC has the same issues as the laptop and it defaults to
HPET. At the time of this post I havent tried a buildworld using a non default
timer, but I am running buildworld now using i8254 on the i5 750 to see what
results I get, I will run many times over multiple reboots.
The VMWare hypervisor has no segfault problems and uses LAPIC by default
working fine on 11.0 and 11-STABLE.
All the current tests are with empty src.conf aside from
'LOADER_ZFS_SUPPORT=YES'' and no CPUTYPE defined to try and simplify the
diagnosis.
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