linux-kernel - Re: futex hang with rpm in 2.6.17.1-2174

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Message-ID: <20061021052423.GF21948@redhat.com>
Date:	Sat, 21 Oct 2006 01:24:23 -0400
From:	Dave Jones <davej@...hat.com>
To:	Ben Greear <greearb@...delatech.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: futex hang with rpm in 2.6.17.1-2174_FC5

On Fri, Oct 20, 2006 at 11:38:58AM -0700, Ben Greear wrote:
 > I had a dead nfs server that was causing some programs to pause,
 > in particular 'yum install foo' was paused.  I kill -9'd the
 > yum related processes.
 > 
 > I fixed up the nfs server and was able to un-mount the file system.
 > I subsequently killed many backed up updatedb and similar processes.
 > 
 > Now, there are no rpm processes, but if I try 'rpm [anything]' it
 > hangs trying to open a futex:
 > 
 > open("/var/lib/rpm/Packages", O_RDONLY|O_LARGEFILE) = 4
 > fcntl64(4, F_SETFD, FD_CLOEXEC)         = 0
 > fstat64(4, {st_mode=S_IFREG|0644, st_size=41390080, ...}) = 0
 > futex(0xb7ba178c, FUTEX_WAIT, 1, NULL <unfinished ...>
 > 
 > Is there any way to figure out what is causing this futex-wait?

The dead rpm you killed left behind locks in its databases.
rm -f /var/lib/rpm/__db* and it should work again.

	Dave

-- 
http://www.codemonkey.org.uk
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