7.1-PRERELEASE freezes

[Christian Laursen]

Hello,

I decided to give 7.1-PRERELEASE a try on one of my machines to find
out if there might be any problems I should be aware of.

I quickly ran into problems. After a while the system freezes
completely. It seems to be somehow related to the load of the machine
as it doesn't seem to happen when it is idle. I built a kernel with
software watchdog enabled and enabled watchdog which had the nice
effect of turning the freeze into a panic. Hopefully that will be of
some help.

I first encountered the problem using SCHED_ULE and then tried if
SCHED_4BSD made any difference. But the freeze happens with either
scheduler.

I have disabled xorg and the nvidia driver but that doesn't help
either. I can cut down on various other stuff too, but first I hope
that someone here have a more educated guess about what could be the
cause of the freezes.

I have placed the backtraces from the most recent crashes as well as
the demsg output from the most recent boot at this URL:
http://borderworlds.dk/~xi/7.1-PRERELEASE.freeze.txt

My kernel config is also included.

As far as I can tell the two backtraces are identical and look like
this:

#0  doadump () at pcpu.h:196
#1  0xc05abd03 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:418
#2  0xc05abeff in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:572
#3  0xc0570d18 in hardclock (usermode=0, pc=3231434181) at /usr/src/sys/kern/kern_clock.c:642
#4  0xc07d194f in clkintr (frame=0xe38e1c68) at /usr/src/sys/i386/isa/clock.c:164
#5  0xc07c0465 in intr_execute_handlers (isrc=0xc0866700, frame=0xe38e1c68) at /usr/src/sys/i386/i386/intr_machdep.c:366
#6  0xc07d0fa8 in atpic_handle_intr (vector=0, frame=0xe38e1c68) at /usr/src/sys/i386/isa/atpic.c:596
#7  0xc07bbf41 in Xatpic_intr0 () at atpic_vector.s:62
#8  0xc09bc5c5 in acpi_cpu_c1 () at /usr/src/sys/modules/acpi/acpi/../../../i386/acpica/acpi_machdep.c:550
#9  0xc09b54f4 in acpi_cpu_idle () at /usr/src/sys/modules/acpi/acpi/../../../dev/acpica/acpi_cpu.c:945
#10 0xc07c35b6 in cpu_idle () at /usr/src/sys/i386/i386/machdep.c:1183
#11 0xc05c9275 in sched_idletd (dummy=0x0) at /usr/src/sys/kern/sched_4bsd.c:1429
#12 0xc05895d6 in fork_exit (callout=0xc05c9260 <sched_idletd>, arg=0x0, frame=0xe38e1d38) at /usr/src/sys/kern/kern_fork.c:804
#13 0xc07bbf10 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:264

I can provide more information as needed.

Any help will be greatly appreciated.

Thanks.

-- 
Christian Laursen