Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752904Ab3GXRgT (ORCPT ); Wed, 24 Jul 2013 13:36:19 -0400 Received: from longford.logfs.org ([213.229.74.203]:59885 "EHLO longford.logfs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752733Ab3GXRgQ (ORCPT ); Wed, 24 Jul 2013 13:36:16 -0400 Date: Wed, 24 Jul 2013 12:04:22 -0400 From: =?utf-8?B?SsO2cm4=?= Engel To: Steven Rostedt Cc: Dave Jones , linux-kernel@vger.kernel.org, steve@purestorage.com Subject: Re: __ftrace_hash_rec_update FTRACE_WARN_ON. Message-ID: <20130724160422.GA3641@logfs.org> References: <20130705142629.GA325@redhat.com> <1373036034.22688.155.camel@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1373036034.22688.155.camel@gandalf.local.home> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3420 Lines: 56 On Fri, 5 July 2013 10:53:54 -0400, Steven Rostedt wrote: > > Can you find an easy reproducer for this? We might have found something: Jul 23 19:00:59 [28253.487058,08] WARNING: at kernel/trace/ftrace.c:1529 __ftrace_hash_rec_update+0x1e3/0x230() Jul 23 19:00:59 [28253.487203,08] Pid: 20903, comm: bash Tainted: G O 3.6.11+ #38405.trunk Jul 23 19:00:59 [28253.487206,08] Call Trace: Jul 23 19:00:59 [28253.487213,08] [] warn_slowpath_common+0x7f/0xc0 Jul 23 19:00:59 [28253.487218,08] [] warn_slowpath_null+0x1a/0x20 Jul 23 19:00:59 [28253.487222,08] [] __ftrace_hash_rec_update+0x1e3/0x230 Jul 23 19:00:59 [28253.487227,08] [] ftrace_hash_move+0x28/0x1d0 Jul 23 19:00:59 [28253.487232,08] [] ? kfree+0x2c/0x110 Jul 23 19:00:59 [28253.487237,08] [] ftrace_regex_release+0x8e/0x150 Jul 23 19:00:59 [28253.487242,08] [] __fput+0xae/0x220 Jul 23 19:00:59 [28253.487247,08] [] ____fput+0xe/0x10 Jul 23 19:00:59 [28253.487252,08] [] task_work_run+0x72/0x90 Jul 23 19:00:59 [28253.487257,08] [] do_notify_resume+0x6c/0xc0 Jul 23 19:00:59 [28253.487262,08] [] ? trace_hardirqs_on_thunk+0x3a/0x3c Jul 23 19:00:59 [28253.487267,08] [] int_signal+0x12/0x17 Jul 23 19:00:59 [28253.487271,08] ---[ end trace 793179526ee09b2c ]--- Jul 23 19:21:02 [ 775.393547,08] WARNING: at kernel/trace/ftrace.c:1529 __ftrace_hash_rec_update+0x1e3/0x230() Jul 23 19:21:02 [ 775.393715,08] Pid: 6376, comm: bash Tainted: G O 3.6.11+ #38405.trunk Jul 23 19:21:02 [ 775.393718,08] Call Trace: Jul 23 19:21:02 [ 775.393727,08] [] warn_slowpath_common+0x7f/0xc0 Jul 23 19:21:02 [ 775.393732,08] [] warn_slowpath_null+0x1a/0x20 Jul 23 19:21:02 [ 775.393737,08] [] __ftrace_hash_rec_update+0x1e3/0x230 Jul 23 19:21:02 [ 775.393741,08] [] ftrace_hash_move+0x28/0x1d0 Jul 23 19:21:02 [ 775.393748,08] [] ? kfree+0x2c/0x110 Jul 23 19:21:02 [ 775.393754,08] [] ftrace_regex_release+0x8e/0x150 Jul 23 19:21:02 [ 775.393771,08] [] __fput+0xae/0x220 Jul 23 19:21:02 [ 775.393784,08] [] ____fput+0xe/0x10 Jul 23 19:21:02 [ 775.393792,08] [] task_work_run+0x72/0x90 Jul 23 19:21:02 [ 775.393798,08] [] do_notify_resume+0x6c/0xc0 Jul 23 19:21:02 [ 775.393804,08] [] ? trace_hardirqs_on_thunk+0x3a/0x3c Jul 23 19:21:02 [ 775.393810,08] [] int_signal+0x12/0x17 Jul 23 19:21:02 [ 775.393814,08] ---[ end trace 3b86cc549cc5483e ]--- If I understand Steve correctly, you have to enable a trace somewhere in a module, them rmmod that module without disabling the trace. Easy enough to avoid, but maybe you are interested. Jörn -- One of the painful things about our time is that those who feel certainty are stupid, and those with any imagination and understanding are filled with doubt and indecision. -- Bertrand Russell -- 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/