Messages in this thread Patch in this message | | | From | Jiri Olsa <> | Subject | [PATCH 5/6] perf tools libdw: Check for mmaps also in MAP__VARIABLE tree | Date | Thu, 17 Dec 2015 21:26:54 +0100 |
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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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