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Date:      Thu, 04 Feb 1999 16:46:53 -0800
From:      Julian Elischer <julian@whistle.com>
To:        Matthew Dillon <dillon@apollo.backplane.com>
Cc:        current@FreeBSD.ORG
Subject:   Re: Bug in piperd
Message-ID:  <36BA3F7D.15FB7483@whistle.com>
References:  <199902042219.OAA90785@apollo.backplane.com> <36BA3B93.2781E494@whistle.com> <199902050037.QAA91805@apollo.backplane.com>

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Matthew Dillon wrote:
> 
> :
> :I've been seeng lockups in 3.0 where as is in piperd,
> :but the stack trace has always looked as if the problem was in soft
> :updates or the syncer daemon..
> :
> 
>     It's quite possible for as to be in 'piperd' when some other unassociated
>     crash occurs, since it is typically waiting for input from cc1.  What
>     is not typical, however, is if as is stuck 'piperd' and the other end of
>     the pipe has been closed.
> 
>     The particular piperd bug I found cannot crash the system - at worst it
>     will block a process forever.  And you can still kill the process.
> 
>     3.0's lockups could be very well due to a number of low-memory interlock
>     situations that typically occur when heavy paging is going on, if that is
>     how you are running 3.0.  I suspect it is too late to get my getpbuf()
>     changes into 3.1, which might mitigate that somewhat.


the lockups are in a 2 day old SNAP of 3.x

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