Re: 2.5.40-mm2

Dave Hansen
2002-10-06T20:42:36Z

Andrew Morton wrote:
> Ingo said that his 2.4-based per-cpu-pages patch was beneficial to
> specweb, but nobody has tested these patches with specweb. Hint.

cc'ing Ingo, because I think this might be related to the timer bh
removal.

2.5.40 doesn't last very long under Specweb. It always dies out with
one of these oopses after a little while:

CPU: 3
EIP: 0060:[<801204a9>] Not tainted
EFLAGS: 00010006
EIP is at run_timer_tasklet+0xcd/0x13c
eax: 00000000 ebx: 802657a8 ecx: e3c640a0 edx: 00000000
esi: e3c642c0 edi: 8039cae0 ebp: 00000246 esp: 8c3d9f20
ds: 0068 es: 0068 ss: 0068
Process swapper (pid: 0, threadinfo=8c3d8000 task=8c3dc760)
Stack: 8c093188 00000000 8c3d8000 00000001 8011d2e5 00000000 00000001
80399960
fffffffe 00000060 8037e324 8037e324 8011cfea 80399960 0000000c
00000003
00000000 00000000 00000046 801111dd 8c3d8000 80105334 00000000
80107a8a
Call Trace:
[<8011d2e5>] tasklet_hi_action+0x85/0xe0
[<8011cfea>] do_softirq+0x5a/0xac
[<801111dd>] smp_apic_timer_interrupt+0x111/0x118
[<80105334>] poll_idle+0x0/0x48
[<80107a8a>] apic_timer_interrupt+0x1a/0x20
[<80105334>] poll_idle+0x0/0x48
[<8010535d>] poll_idle+0x29/0x48
[<801053b3>] cpu_idle+0x37/0x48
[<801183ad>] printk+0x125/0x140

Code: 89 50 04 89 02 c7 06 00 00 00 00 c7 46 04 00 00 00 00 c7 46

I'll get a properly decoded one later. I think I just wrote over my
old vmlinux. But, it looks to me like this is somewhere inside
__run_timers() at kernel/timer.c :329, which looks something like this:
list_del(&timer->entry);
timer->base = NULL;
#if CONFIG_SMP
base->running_timer = timer;
#endif

kgdb kills this machine when kjournald is starting up. Time to try
kdb. I _really_ hate this POS hardware.

--
Dave Hansen
haveblue@us.ibm.com