From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ravikiran G Thirumalai Subject: Re: [patch] mm: close page_mkwrite races (try 3) Date: Tue, 28 Apr 2009 11:57:39 -0700 Message-ID: <20090428185739.GE6377@localdomain> References: <20090414071152.GC23528@wotan.suse.de> <20090415082507.GA23674@wotan.suse.de> <20090415183847.d4fa1efb.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Nick Piggin , Sage Weil , Trond Myklebust , linux-fsdevel@vger.kernel.org, Linux Memory Management List To: Andrew Morton Return-path: Content-Disposition: inline In-Reply-To: <20090415183847.d4fa1efb.akpm@linux-foundation.org> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org On Wed, Apr 15, 2009 at 06:38:47PM -0700, Andrew Morton wrote: >On Wed, 15 Apr 2009 10:25:07 +0200 Nick Piggin wrote: > >> - Trond for NFS (http://bugzilla.kernel.org/show_bug.cgi?id=12913). > >I wonder which kernel version(s) we should put this in. > >Going BUG isn't nice, but that report is against 2.6.27. Is the BUG >super-rare, or did we avoid it via other means, or what? > Jumping in late in after being bit by this bug many times over with 2.6.27. The bug (http://bugzilla.kernel.org/show_bug.cgi?id=12913) is not rare with the right workload at all. I can easily make it happen on smp machines, when multiple processes are writing to the same NFS mounted file system. AFAICT this needs to be back ported to 27 stable and 29 stable as well. Nick, are there 27 based patches already available someplace? Obviously, I have verified these patches + Trond's patch -- http://lkml.org/lkml/2009/4/25/64 fixes the issue with 2.6.30-rc3 Thanks, Kiran -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org