From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932452Ab3BNPIP (ORCPT ); Thu, 14 Feb 2013 10:08:15 -0500 Received: from mail-ee0-f43.google.com ([74.125.83.43]:53071 "EHLO mail-ee0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754474Ab3BNPIO (ORCPT ); Thu, 14 Feb 2013 10:08:14 -0500 Date: Thu, 14 Feb 2013 16:08:10 +0100 From: Ingo Molnar To: Thomas Gleixner Cc: Linus Torvalds , Linux Kernel Mailing List , Jens Axboe , Alexander Viro , "Theodore Ts'o" , "H. Peter Anvin" Subject: Re: [-rc7 regression] Block IO/VFS/ext3/timer spinlock lockup? Message-ID: <20130214150810.GA26095@gmail.com> References: <20130213111007.GA11367@gmail.com> <20130214144510.GC25282@gmail.com> <20130214145424.GA26071@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130214145424.GA26071@gmail.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Ingo Molnar wrote: > > CPU0 appears to be idle: > > > > [ 118.510000] Call Trace: > > [ 118.510000] [<7900844b>] cpu_idle+0x86/0xb4 > > [ 118.510000] [<792a91df>] rest_init+0x103/0x108 > > [ 118.510000] [<794558cc>] start_kernel+0x2c7/0x2cc > > > So, I've done a partial bisection, the breakage appears to have > gone upstream between v3.8-rc3 and v3.8-rc4. > > This roughly coincides with the time frame when I first saw > these lockups pop up, so in that sense it's a plausible result - > but there weren't all that many commits in -rc4 and none looks > really suspicious, so this might be one of those non-bisectable > bugs. > > ( Later today I'll try to finish the bisection just in case it > results in something useful. ) Managed to squeeze in some more bisection steps - and in fact the mm/ changes in -rc4 are still included in the bisection window: git bisect bad 7c8284c3aa127ffe72a90a1bad52183ec9ad870a git bisect good 0a1af1d61edae189b0a81bc46386ab37eb3d9d4d vega:~/linux/linux> gll 0a1af1..7c8284c3a mm/ 8fb74b9fb2b1 mm: compaction: partially revert capture of suitable high-order page 062f1af2170a mm: thp: acquire the anon_vma rwsem for write during split 572043c90db6 mm: mmap: annotate vm_lock_anon_vma locking properly for lockdep 10d73e655cef mm: bootmem: fix free_all_bootmem_core() with odd bitmap alignment c060f943d092 mm: use aligned zone start for pfn_to_bitidx calculation 7964c06d66c7 mm: compaction: fix echo 1 > compact_memory return error issue c0232ae861df mm: memblock: fix wrong memmove size in memblock_merge_regions() 04fa5d6a6547 mm: migrate: check page_count of THP before migrating these three: 10d73e655cef mm: bootmem: fix free_all_bootmem_core() with odd bitmap alignment c060f943d092 mm: use aligned zone start for pfn_to_bitidx calculation c0232ae861df mm: memblock: fix wrong memmove size in memblock_merge_regions() might have highmem=512m boot parameter sensitivity. Thanks, Ingo