linux-kernel - Re: [BUG] 3.13-rc1 kernel crash when enable all tracepoints

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Message-ID: <52946261.8020408@hitachi.com>
Date:	Tue, 26 Nov 2013 17:57:05 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Jovi Zhangwei <jovi.zhangwei@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [BUG] 3.13-rc1 kernel crash when enable all tracepoints

(2013/11/26 16:20), Jovi Zhangwei wrote:
> I'm not sure this relate with ftrace:function event, from the
> crash log, it seems more like caused by lock events.
> 
> Now I only enable lock events (lockdep compiled in my box), below
> two commands both can crash system.

That is not the lockdep, but the lockstat. :)

> 
> #echo 1 > /sys/kernel/debug/tracing/events/lock/lock_acquire/enable
> or.
> #echo 1 > /sys/kernel/debug/tracing/events/lock/lock_release/enable
> 
> According to the log, it seems like a recursion tracing bug.
> 
> register lock event -> jump_label_update -> text_poke_bp ->
> on_each_cpu -> local_apic_timer_interrupt -> ktime_get_update_offsets
> -> lock_release

OK, the problem is in the lock_acquire/release events.

> (Perhaps the crash you reproduced is another crash? similar crash log?)

Right, that was my mistake. Now I got same error log on kvm too.
This should be fixed.

Thank you,

-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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