linux-kernel - Re: [PATCH 2/6] tracing: increase size of number of possible events

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Date:	Fri, 24 Apr 2009 10:05:07 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Li Zefan <lizf@...fujitsu.com>
cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 2/6] tracing: increase size of number of possible
 events


On Fri, 24 Apr 2009, Steven Rostedt wrote:

> 
> On Fri, 24 Apr 2009, Li Zefan wrote:
> > 
> > console 1:
> >  # cat /debug/tracing/trace_pipe
> > 
> > console 2:
> > while (1) {
> > 	insmod trace-events-sample.ko
> > 	echo foo_bar > /debug/tracing/set_event
> > 	rmmod trace-events-sample.ko
> > }
> > 
> > I got this immediately:
> > 
> > BUG: unable to handle kernel NULL pointer dereference at 0000006f
> > IP: [<c05210f3>] bstr_printf+0x2ce/0x302
> > ...
> > Call Trace:
> >  [<c0476d12>] ? trace_seq_bprintf+0x28/0x41
> >  [<c0477569>] ? trace_bprint_print+0x58/0x6c
> >  [<c0472ffc>] ? print_trace_line+0x2c5/0x2df
> >  [<c0428a41>] ? sub_preempt_count+0x85/0xa0
> >  [<c04758cf>] ? tracing_read_pipe+0x118/0x191
> >  [<c04757b7>] ? tracing_read_pipe+0x0/0x191
> >  [<c04b09f9>] ? vfs_read+0x8f/0x136
> >  [<c04b0da3>] ? sys_read+0x40/0x65
> >  [<c0402a68>] ? sysenter_do_call+0x12/0x36
> > 
> > (We can even get other crashes..)
> > 
> 
> Can you send me your full bootlog and config. I'm not able to reproduce 
> this.

And the SHA1 of the HEAD of the git repo you are using.

Thanks,

-- Steve

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