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SubjectRe: 2.6.9-rc2-mm4 ps hang ?
Andrew Morton wrote:
> Badari Pulavarty <pbadari@us.ibm.com> wrote:
>
>>Here is the full sysrq-t output.
>
>
> What's this guy up to?
>
> db2fmcd D 0000000000000000 0 11032 1 1373 11031 (NOTLB)
> 00000101b9b9bef8 0000000000000002 0000003700000037 00000101c13608a0
> 000000010000009f 0000010199649250 0000010199649588 0000000000000000
> 0000000000000206 ffffffff801353db
> Call Trace:<ffffffff801353db>{try_to_wake_up+971} <ffffffff80445570>{__down_write+128}
> <ffffffff80125e7f>{sys32_mmap+143} <ffffffff80124b01>{ia32_sysret+0}
>
>
> Something is seriously screwed up if it's stuck in try_to_wake_up(). Tried
> generating a few extra traces?
>
> Then again, maybe we're missing an up_read() somewhere. hrm, I'll check.

It's highly^64 unlikely BUT a possible reason for a task getting stuck
in try_to_wakeup() is the function adjust_sched_timestamp() which is
part of the ZAPHOD patch. This could be tested by removing the if-while
statement from that function and seeing if that fixes things. Or you
could just remove the call from try_to_wake_up().

I'll use a more sensible (bounded) mechanism in the next version of ZAPHOD.

Peter
--
Peter Williams pwil3058@bigpond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
-- Ambrose Bierce
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