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b72b8132d8
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: 95931d9a594dd0b5 ("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>