Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757792AbaDIF2V (ORCPT ); Wed, 9 Apr 2014 01:28:21 -0400 Received: from mga09.intel.com ([134.134.136.24]:32699 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750784AbaDIF2T (ORCPT ); Wed, 9 Apr 2014 01:28:19 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,823,1389772800"; d="scan'208";a="509852234" Date: Wed, 9 Apr 2014 13:28:16 +0800 From: Fengguang Wu To: Alessandro Rubini Cc: jet.chen@intel.com, gregkh@linuxfoundation.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [FMC] BUG: scheduling while atomic: swapper/1/0x10000002 Message-ID: <20140409052816.GA29432@localhost> References: <5344BF60.5050300@intel.com> <20140409050843.GA18949@mail.gnudd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140409050843.GA18949@mail.gnudd.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 On Wed, Apr 09, 2014 at 07:08:43AM +0200, Alessandro Rubini wrote: > Hello. > Thank you for the report. > > I'm at a conference and I fear I won't be able to test myself in the > next days, but I think this is already fixed (it is part of > the "misc_register" call path, so it's the same problem). > > The fix is commit v3.11-rc2-11-g783c2fb > > 783c2fb FMC: fix locking in sample chardev driver > > This commit, however, is not part of v3.11 and I think this is why you > are finding the problem in the v3.10..v3.11 interval. Alessandro, you are right. There are no more "scheduling while atomic" bugs in v3.12 and v3.13. Our bisect log shows git bisect bad 38dbfb59d1175ef458d006556061adeaa8751b72 # 10:03 0- 345 Linus 3.14-rc1 However that happen to be caused by an independent "scheduling while atomic" bug: [ 20.038125] Fixing recursive fault but reboot is needed! [ 20.038125] BUG: scheduling while atomic: kworker/0:1H/77/0x00000005 [ 20.038125] INFO: lockdep is turned off. [ 20.038125] irq event stamp: 758 [ 20.038125] hardirqs last enabled at (757): [] _raw_spin_unlock_irq+0x22/0x30 [ 20.038125] hardirqs last disabled at (758): [] _raw_spin_lock_irq+0x14/0x73 [ 20.038125] softirqs last enabled at (302): [] __do_softirq+0x186/0x1d2 [ 20.038125] softirqs last disabled at (295): [] do_softirq_own_stack+0x2f/0x35 [ 20.038125] CPU: 0 PID: 77 Comm: kworker/0:1H Tainted: G D W 3.14.0-rc1 #1 [ 20.038125] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 20.038125] c0420610 c0420610 c0449a38 c1c1f562 c0449a54 c1c1b59c c1f91661 c0420938 [ 20.038125] 0000004d 00000005 c0420610 c0449acc c1c2e4e2 c105fff8 01449a7c 000004af [ 20.038125] c0420610 0000002c 00000001 c0449a7c c0420610 c0449ab4 c106001c 00000000 [ 20.038125] Call Trace: [ 20.038125] [] dump_stack+0x16/0x18 [ 20.038125] [] __schedule_bug+0x5d/0x6f [ 20.038125] [] __schedule+0x45/0x55f [ 20.038125] [] ? vprintk_emit+0x367/0x3a4 [ 20.038125] [] ? vprintk_emit+0x38b/0x3a4 [ 20.038125] [] ? trace_hardirqs_off+0xb/0xd [ 20.038125] [] ? printk+0x38/0x3a [ 20.038125] [] schedule+0x5d/0x5f [ 20.038125] [] do_exit+0xcc/0x75d [ 20.038125] [] ? kmsg_dump+0x184/0x191 [ 20.038125] [] ? kmsg_dump+0x1c/0x191 [ 20.038125] [] oops_end+0x7e/0x83 [ 20.038125] [] no_context+0x1ba/0x1c2 [ 20.038125] [] __bad_area_nosemaphore+0x137/0x13f [ 20.038125] [] ? pte_offset_kernel+0x13/0x2a [ 20.038125] [] ? spurious_fault+0x75/0xd5 [ 20.038125] [] bad_area_nosemaphore+0x12/0x14 Thanks, Fengguang -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/