Return-Path: Received: from mail-out1.uio.no ([129.240.10.57]:46560 "EHLO mail-out1.uio.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756495AbZDXOO2 (ORCPT ); Fri, 24 Apr 2009 10:14:28 -0400 Subject: Re: NFS BUG_ON in nfs_do_writepage From: Trond Myklebust To: Rince Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org In-Reply-To: <5da0588e0904240226j3454941y5f58c17a32a9a23d@mail.gmail.com> References: <20090412235010.c8e3475b.akpm@linux-foundation.org> <1239650202.16771.15.camel@heimdal.trondhjem.org> <5da0588e0904131506k5c58e8ddob9bf38f61da6302a@mail.gmail.com> <5da0588e0904131644g131dc816r61884e83bc4cd006@mail.gmail.com> <5da0588e0904240226j3454941y5f58c17a32a9a23d@mail.gmail.com> Content-Type: text/plain Date: Fri, 24 Apr 2009 10:14:19 -0400 Message-Id: <1240582459.4946.31.camel@heimdal.trondhjem.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: MIME-Version: 1.0 On Fri, 2009-04-24 at 05:26 -0400, Rince wrote: > Applied try 3 of Nick Piggin's patch to 2.6.30-rc3 (cleanly, no less!) > > Doesn't appear to have helped at all - I received my favorite BUG ON > write.c:252 just like always, within 24 hours of booting the kernel, > even. > > - Rich Yes. I'm able to reproduce this bug now. I found that I can trigger it fairly reliably by running iozone in something like the following configuration: "iozone -t 32 -r 1k -s 256m -c -D -K -Z -i0 -i8" I believe it boils down to the problems being discussed in the following thread: http://thread.gmane.org/gmane.linux.nfs/26181 Cheers Trond