linux-kernel - Re: rcu_read_lock() used illegally while idle!

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Date:	Fri, 24 May 2013 10:23:38 -0400
From:	Dave Jones <davej@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	paulmck@...ux.vnet.ibm.com,
	Linux Kernel <linux-kernel@...r.kernel.org>, fweisbec@...il.com
Subject: Re: rcu_read_lock() used illegally while idle!

On Fri, May 24, 2013 at 09:46:20AM -0400, Steven Rostedt wrote:

 > >  > This looks to be the caused by the same issue that this patch fixes:
 > >  > 
 > >  > https://lkml.org/lkml/2013/5/10/537
 > >  > 
 > >  > The schedule_user() was traced, and the preempt_enable_no_trace() that
 > >  > the function tracer does caused for a schedule to occur. As the
 > >  > scheduler uses rcu, and it was called before schedule_user() could tell
 > >  > the kernel that the context is changing from user to kernel.
 > > 
 > > That patch doesn't help unfortunatly.
 > > 
 > 
 > Dave,
 > 
 > Can you send me your full .config, and also what you did to trigger
 > this? As I see ftrace_call is there, I'm assuming you have function
 > tracing enabled somewhere. Probably via perf, as ftrace_ops_control_func
 > is used by perf.
 > 
 > Also, if you added anything special on the kernel command line, that
 > info will be useful too.

.config: http://paste.fedoraproject.org/14281/94052971/raw/

trace shows the problem process was 'cc1', so I was likely building a kernel
at the time.  There was also a trinity run going on in the background.

cmdline: nothing special..

BOOT_IMAGE=/vmlinuz-3.10.0-rc2+ root=UUID=bee21cd9-1852-4d1d-9e9d-2e44332b8df1 ro rd.md=0 rd.lvm=0 rd.dm=0 vconsole.keymap=us rd.luks=0 vconsole.font=latarcyrheb-sun16 consoleblank=0 console=ttyUSB0,115200 console=tty0 pause_on_oops=30 audit=0

	Dave

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