Re: TASK_UNINTERRUPTIBLE kernel client threads

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On Mon, Sep 2, 2019 at 5:39 PM Toby Darling <toby@xxxxxxxxxxxxxxxxx> wrote:
>
> Hi
>
> We have a couple of RHEL 7.6 (3.10.0-957.21.3.el7.x86_64) clients that
> have a number of uninterruptible threads and I'm wondering if we're
> looking at the issue fixed by
> https://www.spinics.net/lists/ceph-devel/msg45467.html (the fix hasn't
> made it into RHEL 7.7 3.10.0-1062).
>
> Stack traces of the hung threads are at http://p.ip.fi/9pQA
>
> There are a number of entries listed in
> /sys/kernel/debug/ceph/*/{osdc,mdsc} at http://p.ip.fi/VVzx
>
> Unfortunately, the issue isn't consistently reproducible

Hi Toby,

Looks very similar.

If you see it happen again, dump all sleeping tasks with
"echo w > /proc/sysrq-trigger".  The "iput" task in that email goes
to sleep voluntarily, so it is not considered hung by the watchdog.

Thanks,

                Ilya
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