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Date: Mon, 21 Jun 2010 13:05:16 -0500 (CDT)
From: Christoph Lameter <cl@linux-foundation.org>
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To: Manfred Spraul <manfred@colorfullife.com>
cc: linux-kernel@vger.kernel.org, Julia Lawall <julia@diku.dk>,
       akpm@linux-foundation.org
Subject: Re: 2.6.35-rc3 deadlocks on wakeup(?) (was on semaphore
 operations)
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Same thing happens with fakeroot-tcp. So it looks like it is not the
semaphore ops but the wakeup logic.

In one case processes wer waiting in sk_wait??  or so and one sees

libfakeroot: read: Connection timed out

after awhile. Wereupon the build continues for a while until it hangs for
good.

Another run resulted in hangs during futex wait:

$ strace -p8015
Process 8015 attached - interrupt to quit
futex(0x2b6bd51d0640, FUTEX_WAIT_PRIVATE, 2, NULL

There are always some zombies around when this occurs.

0  1000  8015  7712  20   0  18632  6796 futex_ S+   pts/0      0:00 /usr/bin/make -f scripts/Makefile.build obj=drivers/net
0  1000  8239  8015  20   0      0     0 exit   Z+   pts/0      0:00 [make] <defunct>
0  1000  8240  8015  20   0      0     0 exit   Z+   pts/0      0:00 [make] <defunct>
0  1000  8251  8015  20   0      0     0 exit   Z+   pts/0      0:00 [make] <defunct>






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