From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Kent <raven@themaw.net>
Subject: Re: Autofs hangs
Date: Tue, 15 Feb 2011 11:32:05 +0800
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To: Steve Thompson <smt@vgersoft.com>
Cc: autofs@linux.kernel.org

On Mon, 2011-02-14 at 14:31 -0500, Steve Thompson wrote:
> CentOS 5.5, 32- and 64-bit. Maps from LDAP. I upgraded recently (as part 
> of a system-wide yum update) from autofs-5.0.1-0.rc2.143.el5_5.4 to 
> autofs-5.0.1-0.rc2.143.el5_5.6, and ever since I have had a MASSIVE number 
> of automount hangs (several per day across 170 systems). Nothing is 
> logged, and the automount deamon is hung solid; only a SIGKILL and a 
> restart can recover the daemon (and, if I wasn't already logged in, a 
> power cycle is required - all accounts use automounted NFS home 
> directories). Reading the Changelog, I see these changes:
> 
> - add mutex to serialize access to mount module handle in parse module
> - dont check null cache on expire
> - fix null cache race
> - fix cache_init() on source re-read
> - fix negative cache included map lookup
> 
> I don't know which of these to point the finger at, but I have also 
> noticed many messages similar to:
> 
> automount<pid>]: update_negative_cache: key "<pid>" not found in map.
> 
> all of which are incorrect. Really need a fix for this asap - we're 
> almost dead in the water.

I can't see any obvious problems 
Can you get a gdb backtrace of a couple of the hangs and post them?
In particular I need the output of "thr a a bt".
Ian