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SubjectRe: [BUG] linux 2.6.0-test8 reaim tests fail to exit


Dave Olien wrote:

>I've observed in the last two days, linux 2.6.0-test8 and I think
>linux 2.6.0-test8-mm1. The reaim test workload fails to exit.
>All of the reaim tasks are blocked in sys_wait4(). But non of
>them seem to have any obvious child processes.
>
>There are also lots of sync() processes. Many of those seem to be
>blocked somewhere scheduling IO. These kernels were all with the
>as-isoched IO scheduler. I may retry with deadline scheduler, just
>to rule out IO scheduler. Is there any link between the sync()
>processes and the reaim waiting for children?
>
>Could there be a problem with IO not completing for the sync()
>tasks that causes the reaim tasks to not complete?
>
>Attached is a console output from a system hung in this state.
>Included (towards the bottom) is a sysrq t output.
>
>I'm hoping to investigate this more closely over the week end.
>

Looks like IO scheduler. Testing deadline would be good. Thanks.

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