linux-kernel - Re: perf: commit 44f24cb3156a1e (Factor DSO symtab types) causes segfaults

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Message-ID: <20120801122522.GB16297@x4>
Date:	Wed, 1 Aug 2012 14:25:22 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: perf: commit 44f24cb3156a1e (Factor DSO symtab types) causes
 segfaults

On 2012.08.01 at 14:21 +0200, Jiri Olsa wrote:
> On Wed, Aug 01, 2012 at 01:57:40PM +0200, Markus Trippelsdorf wrote:
> > On 2012.07.31 at 16:14 +0200, Ingo Molnar wrote:
> > > Jiri Olsa (4):
> > >       perf symbols: Factor DSO symtab types to generic binary types
> > 
> > The commit above causes perf segfaults on my machine (running glibc trunk):
> > 
> > (gdb) run top --stdio
> > Starting program: /usr/src/linux/tools/perf/perf top --stdio
> > warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7ffff7ffa000
> > [Thread debugging using libthread_db enabled]
> > Using host libthread_db library "/lib/libthread_db.so.1".
> > 
> > Program received signal SIGSEGV, Segmentation fault.
> > dso__load (dso=0x6661d0, map=map@...ry=0x666170, filter=filter@...ry=0x426840 <symbol_filter>) at util/symbol.c:1833
> > 1833                    dso->symtab_type = binary_type_symtab[i];
> > (gdb) bt
> > #0  dso__load (dso=0x6661d0, map=map@...ry=0x666170, filter=filter@...ry=0x426840 <symbol_filter>) at util/symbol.c:1833
> > #1  0x000000000045fe87 in map__load (self=self@...ry=0x666170, filter=filter@...ry=0x426840 <symbol_filter>) at util/map.c:124
> > #2  0x000000000045ffbd in map__find_symbol (self=0x666170, addr=11008, filter=filter@...ry=0x426840 <symbol_filter>) at util/map.c:168
> > #3  0x000000000043b5df in perf_event__preprocess_sample (event=event@...ry=0x7ffff44c8720, machine=machine@...ry=0x647730, 
> >     al=al@...ry=0x7fffffffb030, sample=sample@...ry=0x7fffffffb060, filter=filter@...ry=0x426840 <symbol_filter>) at util/event.c:886
> > #4  0x0000000000426d8e in perf_event__process_sample (machine=0x647730, sample=0x7fffffffb060, evsel=<optimized out>, event=0x7ffff44c8720, 
> >     tool=0x7fffffffb2c0) at builtin-top.c:723
> > #5  perf_top__mmap_read_idx (top=top@...ry=0x7fffffffb2c0, idx=idx@...ry=3) at builtin-top.c:858
> > #6  0x00000000004291c3 in perf_top__mmap_read (top=<optimized out>) at builtin-top.c:873
> > #7  __cmd_top (top=0x7fffffffb2c0) at builtin-top.c:1040
> > #8  cmd_top (argc=<optimized out>, argv=<optimized out>, prefix=<optimized out>) at builtin-top.c:1348
> > #9  0x0000000000414d03 in run_builtin (p=p@...ry=0x4dc888, argc=argc@...ry=2, argv=argv@...ry=0x7fffffffe0b0) at perf.c:273
> > #10 0x0000000000415487 in handle_internal_command (argv=0x7fffffffe0b0, argc=2) at perf.c:345
> > #11 run_argv (argv=0x7fffffffdeb0, argcp=0x7fffffffdebc) at perf.c:389
> > #12 main (argc=2, argv=0x7fffffffe0b0) at perf.c:487
> > (gdb)

> I cannot reproduce, but found one obvious bug,
> could you please test?

Your patch fixes the issue.
Thank you.

-- 
Markus
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