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

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Date:	Wed, 30 Nov 2011 16:23:17 +0300
From:	Brian Marete <marete@...hnix.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
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

On Fri, Nov 11, 2011 at 1:01 AM, Brian Marete <marete@...hnix.com> wrote:
>
> Hello,
>
> 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?
>
> Thanks
>
> 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]++;
> #0  0x000000000042e27e in symbol__inc_addr_samples (sym=0x1279e70, map=
>    0x9677a0, evidx=0, addr=256544) at util/annotate.c:73
> #1  0x00000000004215e4 in record_precise_ip (he=0x1e7b260, counter=0,
>    ip=256544) at builtin-top.c:223
> #2  0x0000000000422ba1 in perf_event__process_sample (event=0x7ffff7ec4c60,
>    evsel=0x837a10, sample=0x7fffffffe340, session=0x837e80)
>    at builtin-top.c:801
> #3  0x0000000000422c8c in perf_session__mmap_read_idx (self=0x837e80, idx=1)
>    at builtin-top.c:825
> #4  0x0000000000422d43 in perf_session__mmap_read (self=0x837e80)
>    at builtin-top.c:839
> #5  0x0000000000423295 in __cmd_top () at builtin-top.c:1003
> #6  0x0000000000423940 in cmd_top (argc=0, argv=0x7fffffffe720, prefix=0x0)
>    at builtin-top.c:1274
> #7  0x000000000040ffdc in run_builtin (p=0x6a4bc8, argc=1, argv=0x7fffffffe720)
>    at perf.c:286
> #8  0x00000000004101af in handle_internal_command (argc=1, argv=0x7fffffffe720)
>    at perf.c:358
> #9  0x00000000004102b5 in run_argv (argcp=0x7fffffffe60c, argv=0x7fffffffe600)
>    at perf.c:402
> #10 0x00000000004104f8 in main (argc=1, argv=0x7fffffffe720) at perf.c:512
>
> # 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"}
>
> # Output of p *map
> $2 = {{rb_node = {rb_parent_color = 9861408, rb_right = 0x967860, rb_left =
>    0x9676e0}, node = {next = 0x967920, prev = 0x967860}}, start = 4142972928,
>  end = 4144365568, type = 0 '\000', referenced = true, priv = 0, pgoff = 0,
>  map_ip = 0x44fc69 <map__map_ip>, unmap_ip = 0x44fc92 <map__unmap_ip>, dso =
>    0x8e5490, groups = 0x964cd8}

Hello. I can still reproduce this every time with the tip Linus' tree.
Is there a tree that fixes this? I beginning to wonder if anyone uses
`perf top' :)

Thanks.

--
Brian Gitonga Marete
Toshnix Systems
Tel: +254722151590
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