linux-kernel - Re: [2.6.24 REGRESSION] BUG: Soft lockup

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Message-Id: <1202219216.27371.24.camel@moss-spartans.epoch.ncsc.mil>
Date:	Tue, 05 Feb 2008 08:46:56 -0500
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"\"Oliver Pinter" (Pintér Olivér)" 
	<oliver.pntr@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	James Morris <jmorris@...ei.org>
Subject: Re: [2.6.24 REGRESSION] BUG: Soft lockup - with VFS


On Mon, 2008-02-04 at 21:39 -0800, Andrew Morton wrote:
> On Mon, 28 Jan 2008 09:31:43 +0100 "Oliver Pinter (Pintér Olivér)"  <oliver.pntr@...il.com> wrote:
> 
> > hi all!
> > 
> > in the 2.6.24 become i some soft lockups with usb-phone, when i pluged
> > in the mobile, then the vfs-layer crashed. am afternoon can i the
> > .config send, and i bisected the kernel, when i have time.
> > 
> > pictures from crash:
> > http://students.zipernowsky.hu/~oliverp/kernel/regression_2624/
> 
> It looks like selinux's file_has_perm() is doing spin_lock() on an
> uninitialised (or already locked) spinlock.

The trace looks bogus to me - I don't see how file_has_perm() could have
been called there, and file_has_perm() doesn't directly take any spin
locks.

-- 
Stephen Smalley
National Security Agency

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