linux-kernel - Re: perf top segfaults on current git

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Date:	Wed, 4 Nov 2015 10:21:18 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiri Olsa <jolsa@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: perf top segfaults on current git

Em Wed, Nov 04, 2015 at 11:15:33AM +0100, Markus Trippelsdorf escreveu:
> On 2015.11.03 at 11:02 +0100, Ingo Molnar wrote:
> > 
> > Please pull the latest perf-core-for-linus git tree from:
> 
> Since the current merge "perf top" segfaults on my machine:
> 
> Program received signal SIGSEGV, Segmentation fault.

Thanks for the report, I'll check that.

- Arnaldo
 
> __map__is_kernel (map=map@...ry=0x1abb7a0) at util/map.c:238
> 238             return __machine__kernel_map(map->groups->machine, map->type) == map;
> (gdb) bt
> #0  __map__is_kernel (map=map@...ry=0x1abb7a0) at util/map.c:238
> #1  0x00000000004393e4 in symbol_filter (map=map@...ry=0x1abb7a0, sym=sym@...ry=0x1a88560) at builtin-top.c:658
> #2  0x00000000004fcd4d in dso__load_sym (dso=dso@...ry=0x166dae0, map=map@...ry=0x1abb7a0, syms_ss=0x7fffffff7680, runtime_ss=runtime_ss@...ry=0x7fffffff7680, 
>     filter=filter@...ry=0x4393c0 <symbol_filter>, kmodule=0) at util/symbol-elf.c:1082
> #3  0x00000000004a64e0 in dso__load (dso=0x166dae0, map=map@...ry=0x1abb7a0, filter=filter@...ry=0x4393c0 <symbol_filter>) at util/symbol.c:1530
> #4  0x00000000004b941f in map__load (filter=0x4393c0 <symbol_filter>, map=<optimized out>) at util/map.c:289
> #5  map__find_symbol (map=0x1abb7a0, addr=40188, filter=0x4393c0 <symbol_filter>) at util/map.c:333
> #6  0x00000000004803b1 in perf_event__preprocess_sample (event=event@...ry=0x7ffff6a7a5f0, machine=machine@...ry=0x164c7b8, al=al@...ry=0x7fffffff8a90, 
>     sample=sample@...ry=0x7fffffff8b20) at util/event.c:1045
> #7  0x0000000000439837 in perf_event__process_sample (machine=0x164c7b8, sample=0x7fffffff8b20, evsel=0x164c320, event=0x7ffff6a7a5f0, tool=0x7fffffff8ef0)
>     at builtin-top.c:737
> #8  perf_top__mmap_read_idx (top=top@...ry=0x7fffffff8ef0, idx=idx@...ry=0) at builtin-top.c:870
> #9  0x000000000043b9ef in perf_top__mmap_read (top=0x7fffffff8ef0) at builtin-top.c:887
> #10 __cmd_top (top=0x7fffffff8ef0) at builtin-top.c:1000
> #11 cmd_top (argc=<optimized out>, argv=<optimized out>, prefix=<optimized out>) at builtin-top.c:1329
> #12 0x00000000004756b3 in run_builtin (p=p@...ry=0x5b0608 <commands+264>, argc=argc@...ry=2, argv=argv@...ry=0x7fffffffe500) at perf.c:386
> #13 0x00000000004203e2 in handle_internal_command (argv=0x7fffffffe500, argc=2) at perf.c:447
> #14 run_argv (argv=0x7fffffffe290, argcp=0x7fffffffe29c) at perf.c:491
> #15 main (argc=2, argv=0x7fffffffe500) at perf.c:608
> 
> It only happens occasionally (~every third or fourth run).
> 
> -- 
> Markus
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