[BUG] perf report core dump

[Arun Sharma <asharma@fb.com>]

This happens only with --tui. --stdio is ok for some strange reason.

Core was generated by `perf report -g fractal 0.5 caller --sort pid'.
Program terminated with signal 11, Segmentation fault.
#0  symbol__inc_addr_samples (sym=0xacf360, map=<value optimized out>, 
evidx=0, addr=179753205) at util/annotate.c:71
71      util/annotate.c: No such file or directory.
         in util/annotate.c
(gdb) bt
#0  symbol__inc_addr_samples (sym=0xacf360, map=<value optimized out>, 
evidx=0, addr=179753205) at util/annotate.c:71
#1  0x000000000040ec7a in process_sample_event (event=<value optimized 
out>, sample=0x7fff5a631400, evsel=0x7cbed0, session=0x7ca2c0)
     at builtin-report.c:92
#2  0x000000000043e8a4 in __perf_session__process_events 
(session=0x7ca2c0, data_offset=<value optimized out>, data_size=<value 
optimized out>,
     file_size=7730296, ops=0x689340) at util/session.c:511
#3  0x000000000043ee0a in perf_session__process_events (self=0x7ca2c0, 
ops=0x689340) at util/session.c:1117
#4  0x000000000040ef40 in cmd_report (argc=0, argv=<value optimized 
out>, prefix=<value optimized out>) at builtin-report.c:272
#5  0x000000000040565b in handle_internal_command (argc=5, 
argv=0x7fff5a632830) at perf.c:286
(gdb) x /i $rip
0x41e3cd <symbol__inc_addr_samples+173>:        mov    0x8(%rdx,%rcx,8),%rax
(gdb) p /x addr - sym->start
$9 = 0xffffffffdc290285

util/annotate.c

  68         offset = addr - sym->start;
  69         h = annotation__histogram(notes, evidx);
  70         h->sum++;
  71         h->addr[offset]++;

Not sure why offset is negative here. We might need some extra checks.

  -Arun