[BUG] perf timechart segfault

[Ramkumar Ramachandra]

Hi,

I tried using the `perf timechart` command after a `sudo perf
timechart record -- git status`, and it segfaulted. Backtrace follows:

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x000000000047d728 in perf_session_deliver_event
(session=session@entry=0x8ea450, event=event@entry=0x7ffff7f13f98,
    sample=sample@entry=0x7fffffffd530,
tool=tool@entry=0x7fffffffd7a0, file_offset=file_offset@entry=8088)
    at util/session.c:1006
#2  0x000000000047faec in perf_session__process_event
(file_offset=8088, tool=0x7fffffffd7a0, event=0x7ffff7f13f98,
    session=0x8ea450) at util/session.c:1098
#3  __perf_session__process_events (session=session@entry=0x8ea450,
data_offset=<optimized out>,
    data_size=<optimized out>, file_size=635384,
tool=tool@entry=0x7fffffffd7a0) at util/session.c:1360
#4  0x000000000047ff81 in perf_session__process_events
(self=self@entry=0x8ea450, tool=tool@entry=0x7fffffffd7a0)
    at util/session.c:1403
#5  0x000000000042f12a in __cmd_timechart (output_name=0x4ee399
"output.svg") at builtin-timechart.c:1009
#6  cmd_timechart (argc=0, argv=0x7fffffffdf20, prefix=<optimized
out>) at builtin-timechart.c:1116
#7  0x0000000000419925 in run_builtin (p=p@entry=0x725f90
<commands+240>, argc=argc@entry=1,
    argv=argv@entry=0x7fffffffdf20) at perf.c:319
#8  0x0000000000419199 in handle_internal_command
(argv=0x7fffffffdf20, argc=1) at perf.c:376
#9  run_argv (argv=0x7fffffffdd20, argcp=0x7fffffffdd2c) at perf.c:420
#10 main (argc=1, argv=0x7fffffffdf20) at perf.c:521

I compiled it with EXTRA_CFLAGS="-O0 -g", so all the debugging symbols
should be available. Not sure what's going on, or why I needed sudo to
record data in the first place.

Any hints?
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