Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933193Ab2FVPjW (ORCPT ); Fri, 22 Jun 2012 11:39:22 -0400 Received: from mail-ob0-f174.google.com ([209.85.214.174]:47070 "EHLO mail-ob0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933196Ab2FVPjT (ORCPT ); Fri, 22 Jun 2012 11:39:19 -0400 Message-ID: <1340379615.11290.1.camel@lappy> Subject: RCU hangs in latest linux-next From: Sasha Levin To: paulmck Cc: "linux-kernel@vger.kernel.org" Date: Fri, 22 Jun 2012 17:40:15 +0200 Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3519 Lines: 56 Hi Paul, The following tends to happen quite often when I run the trinity fuzzer on a KVM tools guest using latest linux-next: [ 242.223240] INFO: task rcu_bh:14 blocked for more than 120 seconds. [ 242.225587] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 242.230227] rcu_bh D 0000000000000000 6424 14 2 0x00000000 [ 242.231297] ffff88000d5a1d50 0000000000000046 ffffffff84a6b020 0000000000000286 [ 242.231995] ffff88000d5a0000 ffff88000d5a0010 ffff88000d5a1fd8 ffff88000d5a0000 [ 242.232825] ffff88000d5a0010 ffff88000d5a1fd8 ffff88000d5b0000 ffff88000d59b000 [ 242.233533] Call Trace: [ 242.233752] [] ? synchronize_rcu_expedited+0x220/0x220 [ 242.234866] [] schedule+0x55/0x60 [ 242.235827] [] rcu_gp_kthread+0xfb/0xac0 [ 242.236725] [] ? _raw_spin_unlock_irq+0x2b/0x80 [ 242.237905] [] ? synchronize_rcu_expedited+0x220/0x220 [ 242.239206] [] ? trace_hardirqs_on+0xd/0x10 [ 242.240100] [] ? __schedule+0x84d/0x880 [ 242.241917] [] ? synchronize_rcu_expedited+0x220/0x220 [ 242.244162] [] ? wake_up_bit+0x40/0x40 [ 242.245998] [] ? synchronize_rcu_expedited+0x220/0x220 [ 242.248226] [] kthread+0xb2/0xc0 [ 242.250102] [] kernel_thread_helper+0x4/0x10 [ 242.251887] [] ? retint_restore_args+0x13/0x13 [ 242.254243] [] ? __init_kthread_worker+0x70/0x70 [ 242.256304] [] ? gs_change+0x13/0x13 [ 242.258207] no locks held by rcu_bh/14. [ 242.259523] INFO: task rcu_sched:15 blocked for more than 120 seconds. [ 242.261795] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 242.264267] rcu_sched D 0000000000000000 6552 15 2 0x00000000 [ 242.266855] ffff88000d5a3d50 0000000000000046 ffffffff84964020 0000000000000286 [ 242.269297] ffff88000d5a2000 ffff88000d5a2010 ffff88000d5a3fd8 ffff88000d5a2000 [ 242.272035] ffff88000d5a2010 ffff88000d5a3fd8 ffff88000d528000 ffff88000d5b0000 [ 242.274263] Call Trace: [ 242.275345] [] ? synchronize_rcu_expedited+0x220/0x220 [ 242.277550] [] schedule+0x55/0x60 [ 242.279317] [] rcu_gp_kthread+0xfb/0xac0 [ 242.281129] [] ? _raw_spin_unlock_irq+0x2b/0x80 [ 242.283256] [] ? synchronize_rcu_expedited+0x220/0x220 [ 242.292260] [] ? trace_hardirqs_on+0xd/0x10 [ 242.292264] [] ? __schedule+0x84d/0x880 [ 242.292268] [] ? synchronize_rcu_expedited+0x220/0x220 [ 242.292271] [] ? wake_up_bit+0x40/0x40 [ 242.292274] [] ? synchronize_rcu_expedited+0x220/0x220 [ 242.292277] [] kthread+0xb2/0xc0 [ 242.292280] [] kernel_thread_helper+0x4/0x10 [ 242.292283] [] ? retint_restore_args+0x13/0x13 [ 242.292286] [] ? __init_kthread_worker+0x70/0x70 [ 242.292289] [] ? gs_change+0x13/0x13 [ 242.292291] no locks held by rcu_sched/15. -- 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/