[PATCH 04/13] perf tools libunwind: Check for mmaps also in MAP__VARIABLE tree

From: Jiri Olsa
Date: Thu Jan 07 2016 - 04:18:52 EST


We've seen cases (softice) where DWARF unwinder went
through non executable mmaps, which we need to lookup
in MAP__VARIABLE tree.

Reported-by: Noel Grandin <noelgrandin@xxxxxxxxx>
Tested-by: Noel Grandin <noelgrandin@xxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-@xxxxxxxxxxxxxx
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
tools/perf/util/unwind-libunwind.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
index f37859c04317..ee7e372297e5 100644
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -319,6 +319,15 @@ static struct map *find_map(unw_word_t ip, struct unwind_info *ui)

thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
MAP__FUNCTION, ip, &al);
+ if (!al.map) {
+ /*
+ * We've seen cases (softice) where DWARF unwinder went
+ * through non executable mmaps, which we need to lookup
+ * in MAP__VARIABLE tree.
+ */
+ thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
+ MAP__VARIABLE, ip, &al);
+ }
return al.map;
}

--
2.4.3

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