When the OOM killer finding a victim and trying to kill it, if the victim
is already exiting, the task mm will be NULL and no process will be killed.
But the dump_header() has been already executed, so it will be strange to
dump so many information without killing a process. We'd better show some
helpful information to indicate why this happens.
Suggested-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
---
v1 -> v2:
- improve the output, per Tetsuo and Michal
---
mm/oom_kill.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 6e94962893ee..c176c988c109 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -863,6 +863,8 @@ static void __oom_kill_process(struct task_struct *victim, const char *message)
p = find_lock_task_mm(victim);
if (!p) {
+ pr_info("%s: OOM victim %d (%s) is already exiting. Skip killing the task\n",
+ message, task_pid_nr(victim), victim->comm);
put_task_struct(victim);
return;
} else if (victim != p) {
--
2.18.1
