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SubjectRe: 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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