Re: 2.3.12 processes reading proc stuck in D state

Richard Lyons (rick@powerup.com.au)
Fri, 13 Aug 1999 09:37:27 +1000 (EST)

I have seen this too, after a few hours of high load burn-in on an SMP
box. Two processes that are part of a two different pipe commands (the
use of pipes is the only common factor I have been able to establish)
block in a D state, and top/ps hang when they open /proc/<pid>/stat of the
blocked processes. As you note, normal I/O is not affected. I'll try .13
this afternoon and see if it makes a difference.

On Wed, 11 Aug 1999 craig@zen.co.za wrote:

> Hi
>
> Anyone else seen this? When running ps, top etc. the process would hang
> (unkillably) and the load average would go up a notch. Kernel 2.3.12 on
> a (single) Pentium II 350, 64M RAM and a mostly Redhat 5.2 with bits of
> RH 6 distribution.
>
> Scroll-lock tricks revealed that the processes trying to read proc were
> all stuck in the D state. I could quite happily start other processes
> though eg. xterms.
>
> I haven't tried to reproduce it again - 2.3.13 was out and so I'm
> running that now instead with no problems yet.
>
> Thank you,
>
> PS. Please cc me directly for a quick reply. My lists mail goes to a
> machine that I only get to read infrequently ...
>
> --Craig
>
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