Message-ID: <4FC913FC.2020401@xmsnet.nl>
Date: Fri, 01 Jun 2012 21:11:56 +0200
From: Hans de Bruin <jmdebruin@xmsnet.nl>
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To: Linux NFS mailing list <linux-nfs@vger.kernel.org>
Subject: Re: nfsroot client will not start firefox or thunderbird from 3.4.0
 nfsserver
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On 05/29/2012 12:19 AM, Hans de Bruin wrote:
> I just upgraded my home server from kernel 3.3.5 to 3.4.0 and ran into
> some trouble. My laptop, a nfsroot client, will not run firefox and
> thunderbird anymore. When I start these programs from an xterm, the
> cursor goes to the next line and waits indefinitely.
>
> I do not know if there is any order is lsof's output. A lsof | grep
> firefox or thunderbird shows ......./.parentlock as the last line.
>
> It does not matter whether the client is running a 3.4.0 or a 3.3.0
> kernel, or if the server is running on top of xen or not.
>
> There is some noise in the servers dmesg:
>
> [ 241.256684] INFO: task kworker/u:2:801 blocked for more than 120 seconds.
> [ 241.256691] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"

...

On a almost identical testsystem firefox en thunderbird segfault after 
upgrading to 3.4.0. I would have been nice if it would behave exaclty 
like my home server. I bisected the segfault to:

commit 0fc9d1040313047edf6a39fd4d7c7defdca97c62
Author: Konstantin Khlebnikov <khlebnikov@openvz.org>
Date:   Wed Mar 28 14:42:54 2012 -0700

     radix-tree: use iterators in find_get_pages* functions


When I revert that on top of 3.4.0 the segfaults are gone but both 
firefox en thunderbird go in the lets wait indefinitely mode like the 
homeserver.

I am going to make a bit-wise copy from from my homeserver to my 
testserver and try again.

-- 
Hans