Andrew Morton wrote:
Badari Pulavarty <[email protected]> wrote:
On Mon, 2005-11-14 at 16:17 -0800, Andrew Morton wrote:
Badari Pulavarty <[email protected]> wrote:
My 2-cpu EM64T machine started showing this problem again on 2.6.14.
On some reboots, X seems to spin in the kernel forever.
sysrq-t output shows nothing.
X R running task 0 3607 3589 3903
(L-TLB)
top shows:
3607 root 25 0 0 0 0 R 99.1 0.0 262:04.69 X
So, I wrote a module to do smp_call_function() on all CPUs
to show stacks on them. CPU0 seems to be spinning in exit_mmap().
I did this multiple times to collect stacks few times.
Is this a known issue ?
Nope. Maybe your vma list has a loop in it, in remove_vma()? slab
debugging would detect that, due to the repeated
kmem_cache_free(vm_area_cachep, vma);
I compiled the kernel with slab debug and rebooted the machine.
X seems to be spinning again. But this time, it shows completely
different routines (and seems to be switching CPUs) :(
Something weird is happening on my machine..
top:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3600 root 25 0 0 0 0 R 99.9 0.0 8:29.18 X
...
Then I tried killing it and ran into..
CPU0:
ffffffff8053c750 0000000000000000 00000000000018ff ffff81011c9a4230
ffff81011c9a4000 ffffffff8053c788 ffffffff8026de8f
ffffffff8053c7a8
ffffffff80119591 ffffffff8053c7a8
Call Trace: <IRQ> <ffffffff8026de8f>{showacpu+47}
<ffffffff80119591>{smp_call_function_interrupt+81}
<ffffffff8010e968>{call_function_interrupt+132} <EOI>
<ffffffff880fa225>{:radeon:radeon_do_wait_for_idle+117}
<ffffffff880fa236>{:radeon:radeon_do_wait_for_idle+134}
<ffffffff880fa590>{:radeon:radeon_do_cp_idle+336}
<ffffffff880fc215>{:radeon:radeon_do_release+85}
<ffffffff88104369>{:radeon:radeon_driver_pretakedown+9}
<ffffffff802783aa>{drm_takedown+74}
ah-hah. We've had machines stuck in radeon_do_wait_for_idle() before. In
fact, my workstation was doing it a year or two back.
Are you able to identify the most recent kernel which didn't do this?
I got this machine recently. 2.6.14-rc kernels are the first ones I
tried on this box and they have been failing :(
Only known good kernel I had so far was RHEL4 (2.6.9 base).
Thanks,
Badari
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