linux-kernel - Re: [PATCH] perf top: fix crash on annotate request

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Message-ID: <20111113134314.GA2699@ghostprotocols.net>
Date:	Sun, 13 Nov 2011 11:43:14 -0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Brian Marete <marete@...hnix.com>
Cc:	David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, peterz@...radead.org, fweisbec@...il.com
Subject: Re: [PATCH] perf top: fix crash on annotate request

Em Fri, Nov 11, 2011 at 01:01:47AM +0300, Brian Marete escreveu:
> On Thu, Oct 20, 2011 at 4:00 PM, Arnaldo Carvalho de Melo
> <acme@...stprotocols.net> wrote:
> > I.e. the map_ip for this method is messing up things, what symbol is
> > this? I.e. please provide:

> > p *sym
> > p *map

> I have am experiencing the same segfault using perf from the latest
> linus' tree. The gdb backtrace is below. Which patch fixes it? Or is
> it already fixed in some git tree on kernel.org?

Can you perform this command?

[acme@...icio linux]$ git log | head -1
commit 3439a8da16bcad6b0982ece938c9f8299bb53584

 
> Program received signal SIGSEGV, Segmentation fault.
> 0x000000000042e27e in symbol__inc_addr_samples (sym=0x1279e70, map=0x9677a0,
>     evidx=0, addr=256544) at util/annotate.c:73
> 73		h->addr[offset]++;

> # Output of p *sym
> $1 = {rb_node = {rb_parent_color = 19423281, rb_right = 0x0, rb_left = 0x0},
>   start = 1124896, end = 1126163, namelen = 16, binding = 0 '\000',
>   ignore = false, name = 0x1279e70 "1`(\001"}

It is going well before the start of this symbol:

addr(256544) < sym->start(1124896)
 
- Arnaldo
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