Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751628AbaJKFPf (ORCPT ); Sat, 11 Oct 2014 01:15:35 -0400 Received: from mga02.intel.com ([134.134.136.20]:40855 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750825AbaJKFPe (ORCPT ); Sat, 11 Oct 2014 01:15:34 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,696,1406617200"; d="scan'208";a="587125580" Date: Sat, 11 Oct 2014 13:15:30 +0800 From: Fengguang Wu To: Yuyang Du Cc: LKML , lkp@01.org Subject: [sched] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040 Message-ID: <20141011051530.GA21803@wfg-t540p.sh.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Heirloom mailx 12.5 6/20/10 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Yuyang, FYI, we noticed the below changes on commit 445d95d7c384741d133251a9adac935866591c92 ("sched: Remove update_rq_runnable_avg") +------------------------------------------+------------+------------+ | | 80213c03c4 | 445d95d7c3 | +------------------------------------------+------------+------------+ | boot_successes | 7 | 10 | | boot_failures | 0 | 5 | | BUG:unable_to_handle_kernel | 0 | 5 | | Oops | 0 | 5 | | RIP:print_cfs_group_stats | 0 | 5 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 5 | | backtrace:vfs_read | 0 | 5 | | backtrace:SyS_read | 0 | 5 | +------------------------------------------+------------+------------+ repeat count: 267 2014-10-10 18:20:23 ./case-anon-wx-rand-mt 2014-10-10 18:20:23 ./usemem --runtime 300 -t 4 --prealloc --random 514360832 [ 67.303839] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040 [ 67.304014] IP: [] print_cfs_rq+0x4a3/0xa96 [ 67.304014] PGD 7cd1f067 PUD 7ccbe067 PMD 0 [ 67.315030] Oops: 0000 [#1] SMP [ 67.315030] Modules linked in: snd_pcsp [ 67.315030] CPU: 3 PID: 4013 Comm: sched_debug Not tainted 3.17.0-g4bb7030 #2846 [ 67.315030] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 67.315030] task: ffff88007c6ecb00 ti: ffff88007ccac000 task.ti: ffff88007ccac000 [ 67.315030] RIP: 0010:[] [] print_cfs_rq+0x4a3/0xa96 [ 67.315030] RSP: 0018:ffff88007ccafd60 EFLAGS: 00010086 [ 67.315030] RAX: ffff88011a814000 RBX: ffff88007c47afe8 RCX: 0000000000000513 [ 67.315030] RDX: ffff88007ccafd00 RSI: 0000000000000000 RDI: 0000000000001000 [ 67.315030] RBP: ffff88007ccafda8 R08: 0000000000000000 R09: 0000000000000001 [ 67.315030] R10: ffff88007ccafcc8 R11: 0000000000000000 R12: 0000000000000000 [ 67.315030] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffffffffffff [ 67.315030] FS: 00007f6216ddd700(0000) GS:ffff88011b400000(0000) knlGS:0000000000000000 [ 67.315030] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 67.315030] CR2: 0000000000000040 CR3: 000000007c6ce000 CR4: 00000000000006e0 [ 67.315030] Stack: [ 67.315030] 0000002b20db6a16 0000000000000086 0000000000000000 0000000000000000 [ 67.315030] ffff88011afd47b8 0000000000000000 ffff88007c47afe8 00000000001d4700 [ 67.315030] 0000000000000000 ffff88007ccafde8 ffffffff810aac54 ffff88011afd4870 [ 67.315030] Call Trace: [ 67.315030] [] print_cfs_stats+0x99/0xe0 [ 67.315030] [] print_cpu+0x57d/0x955 [ 67.315030] [] ? might_fault+0x59/0xb4 [ 67.315030] [] sched_debug_show+0x17/0x22 [ 67.315030] [] seq_read+0x16a/0x33e [ 67.315030] [] ? fsnotify+0x267/0x28c [ 67.315030] [] proc_reg_read+0x48/0x67 [ 67.315030] [] ? proc_reg_write+0x67/0x67 [ 67.315030] [] vfs_read+0xa6/0x144 [ 67.315030] [] SyS_read+0x51/0x92 [ 67.315030] [] system_call_fastpath+0x16/0x1b [ 67.315030] Code: f0 00 00 00 31 c0 e8 d6 85 a8 00 49 8b 84 24 c8 00 00 00 48 85 db 48 8b 75 c8 48 8b 80 d8 00 00 00 4c 8b 24 f0 0f 84 17 03 00 00 <4d> 8b 6c 24 40 4c 89 ef e8 9b eb ff ff 4c 89 ef 48 89 45 d0 e8 [ 67.315030] RIP [] print_cfs_rq+0x4a3/0xa96 [ 67.315030] RSP [ 67.315030] CR2: 0000000000000040 [ 67.315030] ---[ end trace c7479625085660d8 ]--- [ 67.315030] Kernel panic - not syncing: Fatal exception 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/