Messages in this thread Patch in this message | | | From | kan.liang@intel ... | Subject | [PATCH 1/1] perf,tools: fix core dump caused by per-socket/core system-wide stat | Date | Fri, 9 Oct 2015 06:59:23 -0400 |
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From: Kan Liang <kan.liang@intel.com>
Perf will core dump if --per-socket/core -a are applied for perf stat.
The root cause is that cpu_map__build_map set refcnt of evlist's cpu_map to 1. It should set refcnt for the newly created cpu_map, not evlist's cpu_map.
Here is the example:
perf stat -e cycles --per-socket -a sleep 1
Performance counter stats for 'system wide':
S0 36 30,196,257 cycles S1 28 15,823,536 cycles
1.001126828 seconds time elapsed
*** Error in `./perf': corrupted double-linked list: 0x00000000021f9090 *** ======= Backtrace: ========= /lib64/libc.so.6[0x3002e7bbe7] /lib64/libc.so.6[0x3002e7d2b5] ./perf(perf_evsel__delete+0x28)[0x485bdd] ./perf[0x4800e8] ./perf(perf_evlist__delete+0x5e)[0x482cd5] ./perf(cmd_stat+0xf25)[0x432328] ./perf[0x4768e0] ./perf[0x476ad6] ./perf[0x476b41] ./perf(main+0x1d0)[0x476db2] /lib64/libc.so.6(__libc_start_main+0xf5)[0x3002e21b45] ./perf[0x4202c5]
Signed-off-by: Kan Liang <kan.liang@intel.com> --- tools/perf/util/cpumap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c index c51c29f..dfc1f0b 100644 --- a/tools/perf/util/cpumap.c +++ b/tools/perf/util/cpumap.c @@ -284,7 +284,7 @@ static int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res, /* ensure we process id in increasing order */ qsort(c->map, c->nr, sizeof(int), cmp_ids); - atomic_set(&cpus->refcnt, 1); + atomic_set(&c->refcnt, 1); *res = c; return 0; } -- 1.8.3.1
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