linux-kernel - Re: [GIT PULL 0/6] perf/core fixes and improvements

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Date:	Fri, 14 Oct 2011 12:07:53 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [GIT PULL 0/6] perf/core fixes and improvements

Em Fri, Oct 14, 2011 at 09:16:10AM +0200, Ingo Molnar escreveu:
> Hm, got a segfault with a plain 'perf top' on a 3.0-0.rc7.git3-ish 
> box:
> 
>  ./perf top
>  Segmentation fault (core dumped)
> 
> It took about 20 attempts to reproduce the segfault, and it always 
> occured right after the first refresh (which, unlike the working 
> cases showed zero samples):
> 
> Program received signal SIGSEGV, Segmentation fault.                                                    
> [Switching to Thread 0x7ffff13a3700 (LWP 21657)]
> ui_browser__hists_seek (whence=<optimized out>, offset=0, 
> self=0x7fffec0008c0)
>     at util/ui/browsers/hists.c:682
> 682		h->row_offset = 0;
> (gdb) 
> 
> (gdb) bt
> #0  ui_browser__hists_seek (whence=<optimized out>, offset=0, self=0x7fffec0008c0)

browser->top was NULL at that point, it was only being initialized in
the refresh routine, fixed in my tree, please re-pull.

One can easily trigger it by specifying a seldom ocurring event, which
will start the browser without samples, then generating such event, I
used net:netif_rx + ping on my workstation.

> Btw., a side note: could we try to reset the console on segfaults and 
> similar crashes? TUI crashes tend to leave the console in a messed up 
> (blue, etc.) state.

I'll work on that, and also on allowing changing the browser colors,
say, to look like the stdio one.

- Arnaldo
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