From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751721Ab3KRPSN (ORCPT ); Mon, 18 Nov 2013 10:18:13 -0500 Received: from merlin.infradead.org ([205.233.59.134]:42413 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751300Ab3KRPSA (ORCPT ); Mon, 18 Nov 2013 10:18:00 -0500 Date: Mon, 18 Nov 2013 16:17:46 +0100 From: Peter Zijlstra To: Vince Weaver Cc: LKML , Ingo Molnar , Paul Mackerras , Arnaldo Carvalho de Melo , tytso@mit.edu, adilger.kernel@dilger.ca Subject: Re: perf bug: bad page map Message-ID: <20131118151746.GC10022@twins.programming.kicks-ass.net> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Nov 15, 2013 at 01:04:23PM -0500, Vince Weaver wrote: > > (figured out the minicom issue). > > Anyway while trying to reproduce the last bug I instead got this with > the perf_fuzzer. > > Is it worth continuing to run and report these issues? I'm losing track > of all the open bugs. This is looks like ext4. Not entirely sure how perf ties into this. Anyway, yes, I do think its useful to keep running these tests, we do fix various issues -- although probably not at the rate you seem to be finding them. > [ 1618.118179] BUG: Bad page map in process perf_fuzzer pte:ffff8800c4d60040 pmd:bd86a067 > [ 1618.142177] addr:0000000000409000 vm_flags:00000875 anon_vma: (null) mapping:ffff8800cb74adf0 index:9 > [ 1618.172142] vma->vm_ops->fault: filemap_fault+0x0/0x358 > [ 1618.187783] vma->vm_file->f_op->mmap: ext4_file_mmap+0x0/0x48 > [ 1618.204981] CPU: 1 PID: 24819 Comm: perf_fuzzer Not tainted 3.12.0 #4 > [ 1618.224256] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015 10/19/2012 > [ 1618.250825] 0000000000409000 ffff8800bf6dfaa8 ffffffff8151d8ec 0000000000000000 > [ 1618.273081] ffff8800c89ac928 ffff8800bf6dfaf8 ffffffff810ed692 dead000000200200 > [ 1618.295345] 00000000c03df067 ffff8800bf6dfbe8 0000000000409000 ffffea0002bc2fe8 > [ 1618.317603] Call Trace: > [ 1618.324951] [] dump_stack+0x49/0x5d > [ 1618.340355] [] print_bad_pte+0x1f5/0x213 > [ 1618.357059] [] unmap_single_vma+0x511/0x666 > [ 1618.374540] [] unmap_vmas+0x32/0x49 > [ 1618.389934] [] exit_mmap+0x84/0x10d > [ 1618.405343] [] ? hrtimer_try_to_cancel+0x41/0x4b > [ 1618.424129] [] mmput+0x4b/0xd1 > [ 1618.438227] [] do_exit+0x36c/0x936 > [ 1618.453366] [] ? update_context_time+0x11/0x34 > [ 1618.471628] [] ? native_sched_clock+0x3b/0x3d > [ 1618.489635] [] ? sched_clock_local+0x1c/0x82 > [ 1618.507376] [] do_group_exit+0x78/0xa0 > [ 1618.523563] [] get_signal_to_deliver+0x46d/0x48a > [ 1618.542347] [] ? ctx_sched_in+0x35/0x185 > [ 1618.559051] [] ? perf_event_sched_in+0x69/0x72 > [ 1618.577318] [] do_signal+0x46/0x5f5 > [ 1618.592724] [] ? __perf_event_task_sched_in+0x3a/0x10e > [ 1618.613071] [] ? finish_task_switch+0x46/0x98 > [ 1618.631075] [] ? __schedule+0x51c/0x54b > [ 1618.647516] [] do_notify_resume+0x2c/0x64 > [ 1618.664486] [] retint_signal+0x3d/0x78 > [ 1618.680661] Disabling lock debugging due to kernel taint >