From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx161.postini.com [74.125.245.161]) by kanga.kvack.org (Postfix) with SMTP id 5F00E8D0001 for ; Fri, 11 May 2012 16:10:05 -0400 (EDT) Date: Fri, 11 May 2012 13:10:03 -0700 From: Andrew Morton Subject: Re: [Bug 43227] New: BUG: Bad page state in process wcg_gfam_6.11_i Message-Id: <20120511131003.282e9daa.akpm@linux-foundation.org> In-Reply-To: <20120511200615.GA12268@redhat.com> References: <20120511125921.a888e12c.akpm@linux-foundation.org> <20120511200615.GA12268@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Dave Jones Cc: linux-mm@kvack.org, bugzilla-daemon@bugzilla.kernel.org, sliedes@cc.hut.fi On Fri, 11 May 2012 16:06:15 -0400 Dave Jones wrote: > On Fri, May 11, 2012 at 12:59:21PM -0700, Andrew Morton wrote: > > > > https://bugzilla.kernel.org/show_bug.cgi?id=43227 > > > > > > [67031.755786] BUG: Bad page state in process wcg_gfam_6.11_i pfn:02519 > > > [67031.755790] page:ffffea0000094640 count:0 mapcount:0 mapping: > > > (null) index:0x7f1eb293b > > > [67031.755792] page flags: 0x4000000000000014(referenced|dirty) > > > > AFAICT we got this warning because the page allocator found a free page > > with PG_referenced and PG_dirty set. > > > > It would be a heck of a lot more useful if we'd been told about this > > when the page was freed, not when it was reused! Can anyone think of a > > reason why PAGE_FLAGS_CHECK_AT_FREE doesn't include these flags (at > > least)? > > We got a similar bug reported in Fedora against 3.3.4 yesterday. > > https://bugzilla.redhat.com/show_bug.cgi?id=820603 > > :[162276.196730] BUG: Bad page state in process transmission-gt pfn:1bddff > :[162276.196735] page:ffffea0006f77fc0 count:0 mapcount:0 mapping: (null) index:0x7f2fdb962 > :[162276.196737] page flags: 0x40000000000014(referenced|dirty) > > Different trace, but same result. > That narrows it down to a 3.3.2 -> 3.3.4 regression, perhaps. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org