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Message-ID: <tip-c09e31cc128cf1aec3a6cd47203508fbf0082873@git.kernel.org>
Date: Fri, 9 Jan 2015 04:31:27 -0800
From: tip-bot for Namhyung Kim <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: eranian@...gle.com, namhyung@...nel.org, mingo@...nel.org,
fweisbec@...il.com, andi@...stfloor.org, adrian.hunter@...el.com,
linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
jolsa@...hat.com, tglx@...utronix.de, a.p.zijlstra@...llo.nl
Subject: [tip:perf/urgent] perf hists browser:
Fix segfault when showing callchain
Commit-ID: c09e31cc128cf1aec3a6cd47203508fbf0082873
Gitweb: http://git.kernel.org/tip/c09e31cc128cf1aec3a6cd47203508fbf0082873
Author: Namhyung Kim <namhyung@...nel.org>
AuthorDate: Wed, 24 Dec 2014 15:04:36 +0900
Committer: Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 8 Jan 2015 11:59:16 -0300
perf hists browser: Fix segfault when showing callchain
When perf report on TUI shows callchain it checks first node has
siblings to determine whether it needs to print percentage value.
But it missed a case that first node is NULL. So sometimes it segfaults
like below:
$ perf top -g
perf: Segmentation fault
-------- backtrace --------
perf[0x4fcefb]
/usr/lib/libc.so.6(+0x33b20)[0x7f2a35839b20]
perf(rb_next+0x8)[0x47d3d8]
perf[0x4f6058]
perf[0x4f833b]
perf[0x4f8610]
perf[0x4f209e]
perf(ui_browser__run+0x3a)[0x4f2e6a]
perf[0x4f94ee]
perf(perf_evlist__tui_browse_hists+0x94)[0x4fbbf4]
perf[0x444d10]
/usr/lib/libpthread.so.0(+0x7314)[0x7f2a37070314]
/usr/lib/libc.so.6(clone+0x6d)[0x7f2a358ee5bd]
$ addr2line -e `which perf` 0x4f6058
/home/namhyung/project/linux/tools/perf/ui/browsers/hists.c:553
I don't know why the backtrace didn't print some symbols..
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Fixes: 4087d11cd945 ("perf hists browser: Print overhead percent value for first-level callchain")
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1419401076-21700-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/ui/browsers/hists.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index e6bb04b..788506e 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -550,7 +550,7 @@ static int hist_browser__show_callchain(struct hist_browser *browser,
bool need_percent;
node = rb_first(root);
- need_percent = !!rb_next(node);
+ need_percent = node && rb_next(node);
while (node) {
struct callchain_node *child = rb_entry(node, struct callchain_node, rb_node);
--
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