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linux/tools/perf/ui
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Namhyung Kim c09e31cc12 perf hists browser: Fix segfault when showing callchain 
When perf report on TUI shows callchain it checks first node has
siblings to determine whether it needs to print percentage value.

But it missed a case that first node is NULL.  So sometimes it segfaults
like below:

  $ perf top -g
  perf: Segmentation fault
  -------- backtrace --------
  perf[0x4fcefb]
  /usr/lib/libc.so.6(+0x33b20)[0x7f2a35839b20]
  perf(rb_next+0x8)[0x47d3d8]
  perf[0x4f6058]
  perf[0x4f833b]
  perf[0x4f8610]
  perf[0x4f209e]
  perf(ui_browser__run+0x3a)[0x4f2e6a]
  perf[0x4f94ee]
  perf(perf_evlist__tui_browse_hists+0x94)[0x4fbbf4]
  perf[0x444d10]
  /usr/lib/libpthread.so.0(+0x7314)[0x7f2a37070314]
  /usr/lib/libc.so.6(clone+0x6d)[0x7f2a358ee5bd]

  $ addr2line -e `which perf` 0x4f6058
  /home/namhyung/project/linux/tools/perf/ui/browsers/hists.c:553

I don't know why the backtrace didn't print some symbols..

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Fixes: 4087d11cd9 ("perf hists browser: Print overhead percent value for first-level callchain")
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1419401076-21700-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-01-08 11:59:16 -03:00
..
browsers perf hists browser: Fix segfault when showing callchain 2015-01-08 11:59:16 -03:00
gtk perf callchain: Use a common function to resolve symbol or name 2014-11-19 12:33:47 -03:00
stdio perf callchain: Use a common function to resolve symbol or name 2014-11-19 12:33:47 -03:00
tui perf ui/tui: Print backtrace symbols when segfault occurs 2014-12-23 12:05:59 -03:00
browser.c perf ui browser: Allow overriding refresh_dimensions method 2014-07-07 12:36:54 -03:00
browser.h perf ui browser: Allow overriding refresh_dimensions method 2014-07-07 12:36:54 -03:00
helpline.c perf ui/helpline: Introduce ui_helpline__vshow() 2012-12-09 08:46:04 -03:00
helpline.h perf ui/helpline: Introduce ui_helpline__vshow() 2012-12-09 08:46:04 -03:00
hist.c perf hists: Fix children sort key behavior 2015-01-08 11:26:56 -03:00
keysyms.h perf hists browser: Add option for runtime switching perf data file 2013-02-06 18:09:24 -03:00
libslang.h perf tools: Move UI bits to tools/perf/ui directory 2012-04-11 17:16:40 -03:00
progress.c perf ui progress: Per progress bar state 2013-10-23 15:40:38 -03:00
progress.h tools: Consolidate types.h 2014-05-01 21:22:39 +02:00
setup.c perf tools: Call perf_hpp__init() before setting up GUI browsers 2014-05-21 11:45:35 +02:00
ui.h perf tools: Separate out GTK codes to libperf-gtk.so 2013-10-09 15:55:25 -03:00
util.c perf evsel: Introduce perf_evsel__open_strerror method 2013-01-24 16:40:09 -03:00
util.h perf ui: Introduce struct perf_error_ops 2012-06-19 13:06:18 -03:00