perf tools: Fix crash on synthesizing the unit
authorJiri Olsa <jolsa@kernel.org>
Mon, 12 Nov 2018 13:00:12 +0000 (14:00 +0100)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 12 Nov 2018 16:37:49 +0000 (08:37 -0800)
commitfb50c09e923870a358d68b0d58891bd145b8d7c7
tree5526b57bfa4f48461e5d873857a3ea42e0376010
parent4d47d6407ac7b4b442a4e717488a3bb137398b6c
perf tools: Fix crash on synthesizing the unit

Adam reported a record command crash for simple session like:

  $ perf record -e cpu-clock ls

with following backtrace:

  Program received signal SIGSEGV, Segmentation fault.
  3543            ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->id[0]);
  (gdb) bt
  #0  perf_event__synthesize_event_update_unit
  #1  0x000000000051e469 in perf_event__synthesize_extra_attr
  #2  0x00000000004445cb in record__synthesize
  #3  0x0000000000444bc5 in __cmd_record
  ...

We synthesize an update event that needs to touch the evsel id array,
which is not defined at that time. Fix this by forcing the id allocation
for events with their unit defined.

Reflecting possible read_format ID bit in the attr tests.

Reported-by: Yongxin Liu <yongxin.liu@outlook.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adam Lee <leeadamrobert@gmail.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=201477
Fixes: bfd8f72c2778 ("perf record: Synthesize unit/scale/... in event update")
Link: http://lkml.kernel.org/r/20181112130012.5424-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/tests/attr/base-record
tools/perf/util/evsel.c