Re: [PATCH 2/6] tracing: increase size of number of possibleevents

[Steven Rostedt]

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.

-- Steve

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