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Subject[PATCH 5/6] perf tools libdw: Check for mmaps also in MAP__VARIABLE tree
Date
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@gmail.com>
Link: http://lkml.kernel.org/n/tip-pd37evgxxggiu5sfomog8gtw@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/util/unwind-libdw.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/tools/perf/util/unwind-libdw.c b/tools/perf/util/unwind-libdw.c
index db8142ba7cb9..cf5e250bc78e 100644
--- a/tools/perf/util/unwind-libdw.c
+++ b/tools/perf/util/unwind-libdw.c
@@ -96,6 +96,16 @@ static int access_dso_mem(struct unwind_info *ui, Dwarf_Addr addr,
thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
MAP__FUNCTION, addr, &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, addr, &al);
+ }
+
+ if (!al.map) {
pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
return -1;
}
--
2.4.3


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