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authorArnaldo Carvalho de Melo <acme@redhat.com>2015-08-19 15:16:08 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-08-19 15:16:08 -0300
commit09f4d78ab0af0973e1a49c10eb7bf977c68cc3aa (patch)
tree66ae9d0816749d2fd6eb4023b8ad6bda2ac7a183
parentcca8482c0651cea97aade58cc22109ce9fffbfa2 (diff)
perf top: Show backtrace when handling a SIGSEGV on --stdio mode
It was just freezing instead of informing about the SEGV, fix it and also print a backtrace, just like in the TUI mode and in 'perf trace'. Tested by provoking a NULL deref when pressing 'z': 0.31% libc-2.20.so [.] malloc_consolidate 0.31% ld-2.20.so [.] _dl_relocate_object 0.28% cc1 [.] ht_lookup 0.28% cc1 [.] ira_init_register_move_cost perf: Segmentation fault Obtained 7 stack frames. perf(dump_stack+0x32) [0x4d69f2] perf(sighandler_dump_stack+0x29) [0x4d6a89] /lib64/libc.so.6(+0x34960) [0x7f5064333960] perf() [0x438790] /lib64/libpthread.so.0(+0x752a) [0x7f50663dd52a] /lib64/libc.so.6(clone+0x6d) [0x7f50643ff22d] # Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-pewrpzqd29rgmhu2wkk7fhww@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/builtin-top.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index ecf319728f25..6135cc07213c 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -601,8 +601,8 @@ static void display_sig(int sig __maybe_unused)
static void display_setup_sig(void)
{
- signal(SIGSEGV, display_sig);
- signal(SIGFPE, display_sig);
+ signal(SIGSEGV, sighandler_dump_stack);
+ signal(SIGFPE, sighandler_dump_stack);
signal(SIGINT, display_sig);
signal(SIGQUIT, display_sig);
signal(SIGTERM, display_sig);