Multiple threads may be creating and destroying BFD objects in
situations like `perf top`.
Without appropriate initialization crashes may occur during libbfd's
cache management.
BFD's locks require recursive mutexes, add support for these.
Committer testing:
This happens only when building with 'make BUILD_NONDISTRO=1' and having
the binutils-devel package (or equivalent) installed, i.e. linking with
binutils devel files, an opt-in perf build.
Before:
root@x1:~# perf top
perf: Segmentation fault
-------- backtrace --------
<SNIP multiple failed attempts at printing a backtrace>
root@x1:~#
After this patch it works as before.
Closes: https://lore.kernel.org/lkml/aQt66zhfxSA80xwt@gentoo.org/
Fixes: 95931d9a59 ("perf libbfd: Move libbfd functionality to its own file")
Reported-by: Guilherme Amadio <amadio@gentoo.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
b72b8132d8