When the main thread exits,
void *do_thread(void *arg)
{
pause();
return NULL;
}
int main(void)
{
pthread_t thr;
pthread_create(&thr, NULL, do_thread, NULL);
syscall(__NR_exit, 0);
return 0;
}
/bin/ps's output looks really confusing, as if the whole process is dead.
I think this even looks like a kernel bug to the user, because it sees a
zombie which is not going to be reaped.
Change get_task_state() to report "S (sleeping)" in this case. Still not
perfect because the task can be confused with the kernel thread (its ->mm
is NULL), but imho better anyway.
Also, uninline get_task_state(), it has 2 callers.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
--- 2.6.27-rc4/fs/proc/array.c~ZOMBIE_LEADER 2008-07-30 13:12:47.000000000 +0400
+++ 2.6.27-rc4/fs/proc/array.c 2008-08-30 18:17:10.000000000 +0400
@@ -146,10 +146,14 @@ static const char *task_state_array[] =
"X (dead)" /* 32 */
};
-static inline const char *get_task_state(struct task_struct *tsk)
+static const char *get_task_state(struct task_struct *tsk)
{
- unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
const char **p = &task_state_array[0];
+ unsigned int state = tsk->exit_state | (tsk->state & TASK_REPORT);
+
+ /* don't confuse /bin/ps if the whole process is not dead */
+ if (tsk->exit_state && delay_group_leader(tsk))
+ state = TASK_INTERRUPTIBLE;
while (state) {
p++;
--
