linux-kernel - Re: [Bug #13728] 2.6.31-rc2 soft lockups, RPC-related

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Message-ID: <87iqi0f4e4.fsf@bulky.wgtn.ondioline.org>
Date:	Sat, 11 Jul 2009 12:29:55 +1200
From:	Paul Collins <paul@...ly.ondioline.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Trond Myklebust" <Trond.Myklebust@...app.com>
Subject: Re: [Bug #13728] 2.6.31-rc2 soft lockups, RPC-related

"Rafael J. Wysocki" <rjw@...k.pl> writes:

> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=13728
> Subject		: 2.6.31-rc2 soft lockups, RPC-related
> Submitter	: Paul Collins <paul@...ly.ondioline.org>
> Date		: 2009-07-05 7:17 (2 days old)
> References	: http://marc.info/?l=linux-kernel&m=124677884816794&w=4

Still present as of 2.6.31-rc2-00257-gc2cc49a.

I tried reverting 3f09df70e3a33590ae5a97b8a15486d3711c7065 ("NFS: Ensure
we always hold the BKL when dereferencing inode->i_flock") to no avail,
so I guess it's bisection time.

Attached in case it is useful is dmesg from boot wherein the following
occurs: 1) I trigger the problem by opening a file on NFS with emacs 2)
I trigger sysrq-T 3) the softlockup warnings fire 4) I trigger sysrq-T
again.

After this all occurred I was still able to perform operations on the
NFS mount, including playing a movie stored there.

Download attachment "lockups-and-traces.gz" of type "application/octet-stream" (42512 bytes)

-- 
Paul Collins
Wellington, New Zealand

Dag vijandelijk luchtschip de huismeester is dood