From b6847d2c2a50e96680e233ce4b2784981b6f309e Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Fri, 11 Dec 2015 19:06:53 -0300 Subject: [PATCH] perf test: Dump the stack when test segfaults when in verbose mode E.g.: # perf test 26 26: Test mmap thread lookup : FAILED! # perf test -v 26 26: Test mmap thread lookup : --- start --- test child forked, pid 9269 tid = 9269, map = 0x7ff99ff0c000 tid = 9270, map = 0x7ff99ff0b000 tid = 9271, map = 0x7ff99ff0a000 tid = 9272, map = 0x7ff99ff09000 perf: Segmentation fault Obtained 13 stack frames. perf(sighandler_dump_stack+0x41) [0x4e3541] /lib64/libc.so.6(+0x34960) [0x7ff99d5f6960] perf(thread__put+0x5b) [0x4c6f6b] perf(machine__process_event+0x14e) [0x4bd37e] perf(perf_event__synthesize_threads+0x3aa) [0x48678a] perf(test__mmap_thread_lookup+0x20a) [0x474e0a] perf() [0x460d56] perf(cmd_test+0x589) [0x461319] perf() [0x47c641] perf(main+0x617) [0x422317] /lib64/libc.so.6(__libc_start_main+0xf0) [0x7ff99d5e1fe0] perf() [0x422429] [(nil)] test child interrupted ---- end ---- Test mmap thread lookup: FAILED! # Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-sypazzsl4ptctrmlyi2zcmaj@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/tests/builtin-test.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c index 2b1ade1..fa98406 100644 --- a/tools/perf/tests/builtin-test.c +++ b/tools/perf/tests/builtin-test.c @@ -236,6 +236,9 @@ static int run_test(struct test *test, int subtest) dup2(STDOUT_FILENO, STDERR_FILENO); close(nullfd); } + } else { + signal(SIGSEGV, sighandler_dump_stack); + signal(SIGFPE, sighandler_dump_stack); } err = test->func(subtest); -- 2.7.4