From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Stein Subject: kernel crash with kernel 3.17-rc4 Date: Mon, 15 Sep 2014 19:26:56 +0200 Message-ID: <15506745.rmJNHLbm6l@rather> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: Received: from meine-oma.de ([37.120.161.46]:56914 "EHLO meine-oma.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753184AbaIOR36 (ORCPT ); Mon, 15 Sep 2014 13:29:58 -0400 Received: from port-92-195-97-38.dynamic.qsc.de ([92.195.97.38] helo=rather.localnet) by meine-oma.de with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.84) (envelope-from ) id 1XTa6F-00065I-VB for linux-bcache@vger.kernel.org; Mon, 15 Sep 2014 19:30:04 +0200 Sender: linux-bcache-owner@vger.kernel.org List-Id: linux-bcache@vger.kernel.org To: linux-bcache@vger.kernel.org Hello eveybody. Just played around with 3.17-rc4 and bcache. I've build bcache with a 120G SSD as caching device and a Raid1 device (md4) as backing device. Today under heavy i/o load (moving a 100G VM Image) the machine froze. Call trace is this: Sep 15 10:13:48 hn kernel: [82567.843075] Task dump for CPU 0: Sep 15 10:13:48 hn kernel: [82567.843078] bcache_gc R running task 12248 28611 2 0x00080808 Sep 15 10:13:48 hn kernel: [82567.843083] ffffffff81c411c0 ffff88083fa03d78 ffffffff81071492 0000000000000000 Sep 15 10:13:48 hn kernel: [82567.843087] ffffffff81c411c0 ffff88083fa03d98 ffffffff810740b8 ffff88083fa03dd8 Sep 15 10:13:48 hn kernel: [82567.843090] 0000000000000000 ffff88083fa03dc8 ffffffff8108f335 ffff88083fa0d280 Sep 15 10:13:48 hn kernel: [82567.843093] Call Trace: Sep 15 10:13:48 hn kernel: [82567.843096] [] sched_show_task+0xc2/0x130 Sep 15 10:13:48 hn kernel: [82567.843108] [] dump_cpu_task+0x38/0x40 Sep 15 10:13:48 hn kernel: [82567.843119] [] rcu_dump_cpu_stacks+0x85/0xc0 Sep 15 10:13:48 hn kernel: [82567.843131] [] rcu_check_callbacks+0x3c0/0x680 Sep 15 10:13:48 hn kernel: [82567.843135] [] update_process_times+0x43/0x80 Sep 15 10:13:48 hn kernel: [82567.843139] [] tick_sched_handle.isra.13+0x31/0x40 Sep 15 10:13:48 hn kernel: [82567.843142] [] tick_sched_timer+0x47/0x70 Sep 15 10:13:48 hn kernel: [82567.843146] [] __run_hrtimer+0x7b/0x1c0 Sep 15 10:13:48 hn kernel: [82567.843149] [] ? tick_sched_do_timer+0x30/0x30 Sep 15 10:13:48 hn kernel: [82567.843153] [] hrtimer_interrupt+0xf7/0x230 Sep 15 10:13:48 hn kernel: [82567.843158] [] local_apic_timer_interrupt+0x36/0x60 Sep 15 10:13:48 hn kernel: [82567.843162] [] smp_apic_timer_interrupt+0x3e/0x60 Sep 15 10:13:48 hn kernel: [82567.843166] [] apic_timer_interrupt+0x6a/0x70 Sep 15 10:13:48 hn kernel: [82567.843168] [] ? btree_gc_count_keys+0x28/0x60 Sep 15 10:13:48 hn kernel: [82567.843175] [] ? btree_gc_count_keys+0x49/0x60 Sep 15 10:13:48 hn kernel: [82567.843178] [] btree_gc_recurse+0x1b5/0x320 Sep 15 10:13:48 hn kernel: [82567.843182] [] ? btree_gc_mark_node+0x63/0x240 Sep 15 10:13:48 hn kernel: [82567.843186] [] ? __wake_up+0x4e/0x70 Sep 15 10:13:48 hn kernel: [82567.843190] [] bch_btree_gc+0x415/0x5a0 Sep 15 10:13:48 hn kernel: [82567.843194] [] ? finish_wait+0x80/0x80 Sep 15 10:13:48 hn kernel: [82567.843197] [] bch_gc_thread+0x38/0x120 Sep 15 10:13:48 hn kernel: [82567.843200] [] ? bch_btree_gc+0x5a0/0x5a0 Sep 15 10:13:48 hn kernel: [82567.843204] [] kthread+0xc4/0xe0 Sep 15 10:13:48 hn kernel: [82567.843207] [] ? kthread_worker_fn+0x150/0x150 Sep 15 10:13:48 hn kernel: [82567.843211] [] ret_from_fork+0x7c/0xb0 Sep 15 10:13:48 hn kernel: [82567.843214] [] ? kthread_worker_fn+0x150/0x150 That's it. Should i be worried? It's a testing machine of course. thanks and best regards t.