perf tools: Avoid deadlock when map_groups are broken
authorAdrian Hunter <adrian.hunter@intel.com>
Wed, 19 Aug 2015 14:29:19 +0000 (17:29 +0300)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Wed, 19 Aug 2015 17:15:09 +0000 (14:15 -0300)
commit0d7e7acc47133e82911e24758178815cfee309e9
treec95e7817da85ba9a8bf711d58600add03b7a16df
parentd7a702f0b1033cf402fef65bd6395072738f0844
perf tools: Avoid deadlock when map_groups are broken

Attempting to clone map groups onto themselves will deadlock.

It only happens because of other bugs, but the code should protect
itself anyway.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/1439994561-27436-2-git-send-email-adrian.hunter@intel.com
[ Use pr_debug() instead of dump_fprintf() ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/util/thread.c