summaryrefslogtreecommitdiff
path: root/tools/perf/util/build-id.c
diff options
context:
space:
mode:
authorHe Kuang <hekuang@huawei.com>2015-04-10 12:35:00 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-04-10 16:13:59 +0300
commit5e78c69b72276853ac64070a010e6df64723dba9 (patch)
tree5549ea875500fe48b774b14270ba00bef039f3ef /tools/perf/util/build-id.c
parent1060ab857f64f33a9445881fd31fa91470aeb622 (diff)
downloadlinux-5e78c69b72276853ac64070a010e6df64723dba9.tar.xz
perf buildid-list: Fix segfault when show DSOs with hits
commit: f3b623b8490a ("perf tools: Reference count struct thread") appends every thread->node to dead_threads in machine__remove_thread() and list_del_init() this node in thread__put(). perf_event__exit_del_thread() releases thread wihout using machine__remove_thread(), and causes a NULL pointer crash when list_del_init(&thread->node) is called. Fix this by using machine_remove_thread() instead of using thread__put() directly. This problem can be reproduced as following: $ perf record ls $ perf buildid-list --with-hits [ 3874.195070] perf[1018]: segfault at 0 ip 00000000004b0b15 sp 00007ffc35b44780 error 6 in perf[400000+166000] Segmentation fault After this patch: $ perf record ls $ perf buildid-list --with-hits bc23e7c3281e542650ba4324421d6acf78f4c23e /proc/kcore 643324cb0e969f30c56d660f167f84a150845511 [vdso] 0000000000000000000000000000000000000000 /bin/busybox ... Signed-off-by: He Kuang <hekuang@huawei.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1428658500-6483-1-git-send-email-hekuang@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/build-id.c')
-rw-r--r--tools/perf/util/build-id.c8
1 files changed, 2 insertions, 6 deletions
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index f7fb2587df69..61867dff5d5a 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -59,12 +59,8 @@ static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
event->fork.ppid, event->fork.ptid);
- if (thread) {
- rb_erase(&thread->rb_node, &machine->threads);
- if (machine->last_match == thread)
- thread__zput(machine->last_match);
- thread__put(thread);
- }
+ if (thread)
+ machine__remove_thread(machine, thread);
return 0;
}