From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754063Ab2IYIwR (ORCPT ); Tue, 25 Sep 2012 04:52:17 -0400 Received: from mail-ey0-f174.google.com ([209.85.215.174]:64275 "EHLO mail-ey0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753668Ab2IYIwQ (ORCPT ); Tue, 25 Sep 2012 04:52:16 -0400 Message-ID: <506170BB.4040005@suse.cz> Date: Tue, 25 Sep 2012 10:52:11 +0200 From: Jiri Slaby User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0a2 MIME-Version: 1.0 To: Sasha Levin CC: Alan Cox , Greg Kroah-Hartman , Dave Jones , "linux-kernel@vger.kernel.org" Subject: Re: tty ldisc lockups in linux-next References: <50617008.5000207@oracle.com> In-Reply-To: <50617008.5000207@oracle.com> X-Enigmail-Version: 1.5a1pre Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/25/2012 10:49 AM, Sasha Levin wrote: > Hi all, > > While fuzzing with trinity in a KVM tools guest running linux-next kernel, I keep hitting the following lockup: Hi, I'm confused here. Is this different to what you reported a couple days ago? Doesn't reverting aa3c8af86382 help in the end? > [ 842.780242] INFO: task init:1 blocked for more than 120 seconds. > [ 842.780732] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > [ 842.781559] init D ffff88000d5b0000 3344 1 0 0x00000002 > [ 842.783226] ffff88000d5adc28 0000000000000082 ffff88000d5adbe8 ffffffff81150ac5 > [ 842.784714] ffff88000d5adfd8 ffff88000d5adfd8 ffff88000d5adfd8 ffff88000d5adfd8 > [ 842.785737] ffffffff84e2e420 ffff88000d5b0000 ffff88000d5b08f0 7fffffffffffffff > [ 842.786764] Call Trace: > [ 842.787102] [] ? sched_clock_local+0x25/0xa0 > [ 842.787858] [] schedule+0x55/0x60 > [ 842.788511] [] schedule_timeout+0x45/0x360 > [ 842.789251] [] ? _raw_spin_unlock_irqrestore+0x5d/0xb0 > [ 842.790149] [] ? trace_hardirqs_on+0xd/0x10 > [ 842.790594] [] ? _raw_spin_unlock_irqrestore+0x84/0xb0 > [ 842.791096] [] ? prepare_to_wait+0x77/0x90 > [ 842.791535] [] tty_ldisc_wait_idle.isra.7+0x76/0xb0 > [ 842.792016] [] ? abort_exclusive_wait+0xb0/0xb0 > [ 842.792490] [] tty_ldisc_hangup+0x1cb/0x320 > [ 842.792924] [] ? __tty_hangup+0x122/0x430 > [ 842.793364] [] __tty_hangup+0x12a/0x430 > [ 842.794077] [] ? _raw_spin_unlock_irqrestore+0x84/0xb0 > [ 842.794942] [] disassociate_ctty+0x6c/0x230 > [ 842.795693] [] do_exit+0x3d8/0xa90 > [ 842.796361] [] ? retint_swapgs+0x13/0x1b > [ 842.797079] [] do_group_exit+0x84/0xd0 > [ 842.797818] [] sys_exit_group+0x12/0x20 > [ 842.798524] [] system_call_fastpath+0x1a/0x1f > [ 842.799294] 1 lock held by init/1: > [ 842.799734] #0: (&tty->ldisc_mutex){+.+.+.}, at: [] tty_ldisc_hangup+0x122/0x320 -- js suse labs