> Hi Andrea.
>
> I applied your patch, and while it helped for some processes, it failed
> on others. I wound up with 60 something tasks in the D state (all on
> "wait_on_sup..." according to WCHAN), but only got 2 OOPS.
> alt-sysrq-T generated another couple of OOPSes.
Could you apply this my patch against clean 2.2.0:
ftp://e-mind.com/pub/linux/arca-tree/2.2.0_arca-4.gz
and tell me if you still can reproduce the process stuck in D state?
There was a big race in 2.2.0. I know at least some of the report of
process in D state are been automagically fixed fixing the mmput/get race,
but maybe there are some other things to fix...
> >>EIP: c0110cdb <__down+ab/fc>
> Trace: c0110c10 <generate_oops+0/20>
> Trace: c01b12dc <__down_failed+8/c>
> Trace: c012af58 <real_lookup+24/7c>
> Trace: c012b13e <lookup_dentry+10a/1b8>
> Trace: c012b2b5 <open_namei+6d/370>
> Trace: c01097c4 <system_call+34/38>
This doesn't look like the mmget/mmput race but maybe...
Thanks for having applyed my semaphore deadlock detector and given me
back a very useful report.
Andrea Arcangeli
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