Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753785Ab0GIBD0 (ORCPT ); Thu, 8 Jul 2010 21:03:26 -0400 Received: from mail-iw0-f174.google.com ([209.85.214.174]:48580 "EHLO mail-iw0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751744Ab0GIBDZ convert rfc822-to-8bit (ORCPT ); Thu, 8 Jul 2010 21:03:25 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=oDrpBBqg3h5RLfSa2rIvNXunlLah2bsJsL+fEV/BN4//V/BPbo4a5h4HXQIUZed8Nx LaLzPFswXdD4aFdIeWUbyqggpeyMFLjSNhKvqZD9Wf6NuZnNOTRK+1IrKUkwsfe7RQcU kx5R5mNHlGvbyBbkm7S7Mhhu9h6Czqr++0o+I= MIME-Version: 1.0 In-Reply-To: <20100708204945.01ca1236@corrin.poochiereds.net> References: <-IGZ64uxA6G.A.P0H.bLmNMB@chimera> <20100708204945.01ca1236@corrin.poochiereds.net> Date: Fri, 9 Jul 2010 11:03:23 +1000 Message-ID: Subject: Re: [Bug #16306] 2.6.35-rc3 BUG: unable to handle kernel NULL pointer dereference at 0000000000000048 cifs_show_options From: Andrew Hendry To: Jeff Layton Cc: "Rafael J. Wysocki" , Linux Kernel Mailing List , Kernel Testers List , Maciej Rutecki Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2066 Lines: 48 It might not be a regression, and so far i haven't been able to reproduce. Its seems to be related to suspend/resume interface up/down and mount/unmount. Also potentially with cifs waiting for a NAS to spinup to complete mount. On Fri, Jul 9, 2010 at 10:49 AM, Jeff Layton wrote: > On Fri, ?9 Jul 2010 01:41:39 +0200 (CEST) > "Rafael J. Wysocki" wrote: > >> This message has been generated automatically as a part of a summary report >> of recent regressions. >> >> The following bug entry is on the current list of known regressions >> from 2.6.34. ?Please verify if it still should be listed and let the tracking team >> know (either way). >> >> >> Bug-Entry ? ? : http://bugzilla.kernel.org/show_bug.cgi?id=16306 >> Subject ? ? ? ? ? ? ? : 2.6.35-rc3 BUG: unable to handle kernel NULL pointer dereference at 0000000000000048 cifs_show_options >> Submitter ? ? : Andrew Hendry >> Date ? ? ? ? ?: 2010-06-26 10:46 (13 days old) >> Message-ID ? ?: >> References ? ?: http://marc.info/?l=linux-kernel&m=127754922110501&w=2 >> Handled-By ? ?: Jeff Layton >> >> > > Not sure if this is a new bug or not... > > I don't think this is really a CIFS bug, per-se. It seems like the > problem may be that the iterator for /proc/pid/mountinfo is not > sufficiently protected against removal from the vfsmount list. > > Filesystems don't seem to be expected to do any locking in their > show_options routines though so I'm guessing that something is borked > in the generic vfs layer. > > Either that or this is some sort of generic mem corruption? I'm open to > input from others that have a better grasp of this stuff at the VFS > layer... > > -- > Jeff Layton > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/