On 12/07/2015 02:45 PM, Jiri Olsa wrote:
> On Mon, Dec 07, 2015 at 11:48:07AM +0100, Martin Liška wrote:
>> On 12/02/2015 05:48 PM, Jiri Olsa wrote:
>>> heya,
>>> using the -Og for DEBUG=1 builds gives me many 'optimized out' stuff
>>>
>>> It was introduced in here:
>>> e8b7ea4356fd perf tools: Improve setting of gcc debug option
>>>
>>> - here's backtrace from segfault I was looking at, current code:
>>
>> Hi.
>>
>> Can you please provide a test-case which I can use for testing of the issue?
>
> just run perf report in gdb and kill it with sigsegv from other terminal
> this gives me several instances of <optimized out> right in the backtrace
>
> jirka
>
Hi.
Unfortunately, running 'perf report' for a medium-size report is very fast a
killing the process from other terminal produces:
[Current thread is 1 (Thread 0x7ffff7fc5740 (LWP 7429))]
(gdb) bt
#0 0x00007ffff632d230 in __write_nocancel () from /lib64/libc.so.6
#1 0x00007ffff62c4dff in _IO_new_file_write () from /lib64/libc.so.6
#2 0x00007ffff62c4403 in new_do_write () from /lib64/libc.so.6
#3 0x00007ffff62c5d09 in __GI__IO_do_write () from /lib64/libc.so.6
#4 0x00007ffff62c5417 in __GI__IO_file_xsputn () from /lib64/libc.so.6
#5 0x00007ffff6299cdb in vfprintf () from /lib64/libc.so.6
#6 0x00007ffff62a03f7 in fprintf () from /lib64/libc.so.6
#7 0x00000000004ef12c in hist_entry__fprintf (he=he@entry=0x1c62b30,
size=<optimized out>, size@entry=0, hists=hists@entry=0x1813818,
bf=bf@entry=0x1d5cd40 " 0.08% cc1plus cc1plus", ' ' <repeats 11
times>, "[.]
_Z25number_of_iterations_exitP4loopP8edge_defP15tree_niter_descbb", ' '
<repeats 91 times>..., bfsz=bfsz@entry=479, fp=fp@entry=0x7ffff65f0640
<_IO_2_1_stdout_>)
at ui/stdio/hist.c:427
#8 0x00000000004ef549 in hists__fprintf (hists=hists@entry=0x1813818,
show_header=show_header@entry=true, max_rows=max_rows@entry=0,
max_cols=max_cols@entry=0, min_pcnt=0, fp=0x7ffff65f0640 <_IO_2_1_stdout_>) at
ui/stdio/hist.c:534
#9 0x000000000042d6a3 in perf_evlist__tty_browse_hists (evlist=0x1812c90,
rep=rep@entry=0x7fffffffc6e0, help=help@entry=0x515948 "For a higher level
overview, try: perf report --sort comm,dso") at builtin-report.c:370
#10 0x000000000042d7d2 in report__browse_hists (rep=rep@entry=0x7fffffffc6e0)
at builtin-report.c:455
#11 0x000000000042d992 in __cmd_report (rep=rep@entry=0x7fffffffc6e0) at
builtin-report.c:571
#12 0x000000000042ec1f in cmd_report (argc=0, argv=0x7fffffffde00,
prefix=<optimized out>) at builtin-report.c:957
#13 0x000000000046c496 in run_builtin (p=p@entry=0x7771a0 <commands+192>,
argc=argc@entry=1, argv=argv@entry=0x7fffffffde00) at perf.c:387
#14 0x000000000046c693 in handle_internal_command (argc=1, argv=0x7fffffffde00)
at perf.c:448
#15 0x000000000046c6fe in run_argv (argcp=argcp@entry=0x7fffffffdc6c,
argv=argv@entry=0x7fffffffdc60) at perf.c:492
#16 0x000000000046c94c in main (argc=1, argv=0x7fffffffde00) at perf.c:609
Which is fine.
I've been using GCC 5.2. What version are you using?
I've also tried to run './perf test' and terminate the process at random
places, but the back trace was OK.
I would appreciate if you send me a patch that causes a segfault that is
wrongly displayed.
Thanks,
Martin
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