linux-kernel - Re: [PATCH 0/5] [GIT PULL] updates for tip/tracing/ftrace

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Message-ID: <20090318073903.GA31341@elte.hu>
Date:	Wed, 18 Mar 2009 08:39:03 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Miklos Szeredi <miklos@...redi.hu>
Subject: Re: [PATCH 0/5] [GIT PULL] updates for tip/tracing/ftrace


these latest ftrace changes caused a lockup on a -tip testsystem:

[    7.639947] Testing tracer irqsoff: PASSED
[    7.644283] Testing tracer preemptoff: PASSED
[    7.648893] Testing tracer preemptirqsoff: <0>BUG: spinlock lockup on CPU#1, rcu_torture_fak/801, ffffffff813c9f30
[    7.656831] Pid: 801, comm: rcu_torture_fak Not tainted 2.6.29-rc8-tip #20979
[    7.656831] Call Trace:
[    7.656831]  [<ffffffff8066d473>] _raw_spin_lock+0xf4/0x137
[    7.656831]  [<ffffffff80e3661f>] _spin_lock_irqsave+0x83/0xb1
[    7.656831]  [<ffffffff802b0a5c>] ? stop_critical_timing+0x1c7/0x236
[    7.656831]  [<ffffffff802ac8db>] ? ftrace_now+0x4a/0x69
[    7.656831]  [<ffffffff80e33b95>] ? schedule_timeout+0x31/0xfc
[    7.656831]  [<ffffffff802b0a5c>] stop_critical_timing+0x1c7/0x236
[    7.656831]  [<ffffffff802b0b02>] trace_preempt_on+0x37/0x4d
[    7.656831]  [<ffffffff8024a0ed>] sub_preempt_count+0x44/0x6e
[    7.656831]  [<ffffffff80e33815>] thread_return+0x97/0xd8
[    7.656831]  [<ffffffff8027d99f>] ? __lock_acquire+0xc7b/0xca1
[    7.656831]  [<ffffffff80e33b95>] schedule_timeout+0x31/0xfc
[    7.656831]  [<ffffffff80247743>] ? get_parent_ip+0x20/0x67
[    7.656831]  [<ffffffff8027c0e5>] ? trace_hardirqs_on_caller+0x14c/0x18f
[    7.656831]  [<ffffffff8024a0ed>] ? sub_preempt_count+0x44/0x6e
[    7.656831]  [<ffffffff8027c148>] ? trace_hardirqs_on+0x20/0x36
[    7.656831]  [<ffffffff80e36099>] ? _spin_unlock_irq+0x65/0x89
[    7.656831]  [<ffffffff80e32cfa>] wait_for_common+0xb0/0x10d
[    7.656831]  [<ffffffff8024be06>] ? default_wake_function+0x0/0x36
[    7.656831]  [<ffffffff80e32e90>] wait_for_completion+0x2b/0x41
[    7.656831]  [<ffffffff8026931d>] synchronize_rcu+0x54/0x6f
[    7.656831]  [<ffffffff8026912e>] ? wakeme_after_rcu+0x0/0x36
[    7.656831]  [<ffffffff80242b09>] ? complete+0x2b/0x71
[    7.656831]  [<ffffffff8029d3fc>] rcu_torture_fakewriter+0x98/0x114
[    7.656831]  [<ffffffff8029d364>] ? rcu_torture_fakewriter+0x0/0x114
[    7.656831]  [<ffffffff8029d364>] ? rcu_torture_fakewriter+0x0/0x114
[    7.656831]  [<ffffffff8026b8a1>] kthread+0x5c/0x9f
[    7.656831]  [<ffffffff8020c8da>] child_rip+0xa/0x20
[    7.656831]  [<ffffffff8020c254>] ? restore_args+0x0/0x30
[    7.656831]  [<ffffffff8026b845>] ? kthread+0x0/0x9f
[    7.656831]  [<ffffffff8020c8d0>] ? child_rip+0x0/0x20

config attached.

	Ingo

View attachment "config" of type "text/plain" (56714 bytes)