[PATCH] perf callchain: Add missing parent_val initialization

From: Jiri Olsa
Date: Sat Nov 21 2015 - 05:24:50 EST

Adding missing parent_val callchain_node initialization.
It's causing segfault in perf top:

$ sudo perf top -g
perf: Segmentation fault
-------- backtrace --------
free_callchain_node(+0x29) in perf [0x4a4b3e]
free_callchain(+0x29) in perf [0x4a5a83]
hist_entry__delete(+0x126) in perf [0x4c6649]
hists__delete_entry(+0x6e) in perf [0x4c66dc]
hists__decay_entries(+0x7d) in perf [0x4c6776]
perf_top__sort_new_samples(+0x7c) in perf [0x436a78]
hist_browser__run(+0xf2) in perf [0x507760]
perf_evsel__hists_browse(+0x1da) in perf [0x507c8d]
perf_evlist__tui_browse_hists(+0x3e) in perf [0x5088cf]
display_thread_tui(+0x7f) in perf [0x437953]
start_thread(+0xc5) in libpthread-2.21.so [0x7f7068fbb555]
__clone(+0x6d) in libc-2.21.so [0x7f7066fc3b9d]

Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-x001nhduevgcl78ublk9eaiz@xxxxxxxxxxxxxx
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
tools/perf/util/callchain.h | 1 +
1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index 6e9b5f2099e1..8ac8f043004c 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -143,6 +143,7 @@ extern __thread struct callchain_cursor callchain_cursor;
static inline void callchain_init(struct callchain_root *root)
+ INIT_LIST_HEAD(&root->node.parent_val);

root->node.parent = NULL;
root->node.hit = 0;

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