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-rw-r--r--kernel/exit.c39
1 files changed, 21 insertions, 18 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 179ac74bf911..3f2182ccf187 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -666,10 +666,14 @@ reparent_thread(struct task_struct *p, struct task_struct *father, int traced)
* the child reaper process (ie "init") in our pid
* space.
*/
-static void
-forget_original_parent(struct task_struct *father, struct list_head *to_release)
+static void forget_original_parent(struct task_struct *father)
{
struct task_struct *p, *n, *reaper = father;
+ struct list_head ptrace_dead;
+
+ INIT_LIST_HEAD(&ptrace_dead);
+
+ write_lock_irq(&tasklist_lock);
do {
reaper = next_thread(reaper);
@@ -677,7 +681,7 @@ forget_original_parent(struct task_struct *father, struct list_head *to_release)
reaper = task_child_reaper(father);
break;
}
- } while (reaper->exit_state);
+ } while (reaper->flags & PF_EXITING);
/*
* There are only two places where our children can be:
@@ -714,12 +718,23 @@ forget_original_parent(struct task_struct *father, struct list_head *to_release)
* while it was being traced by us, to be able to see it in wait4.
*/
if (unlikely(ptrace && p->exit_state == EXIT_ZOMBIE && p->exit_signal == -1))
- list_add(&p->ptrace_list, to_release);
+ list_add(&p->ptrace_list, &ptrace_dead);
}
+
list_for_each_entry_safe(p, n, &father->ptrace_children, ptrace_list) {
p->real_parent = reaper;
reparent_thread(p, father, 1);
}
+
+ write_unlock_irq(&tasklist_lock);
+ BUG_ON(!list_empty(&father->children));
+ BUG_ON(!list_empty(&father->ptrace_children));
+
+ list_for_each_entry_safe(p, n, &ptrace_dead, ptrace_list) {
+ list_del_init(&p->ptrace_list);
+ release_task(p);
+ }
+
}
/*
@@ -730,7 +745,6 @@ static void exit_notify(struct task_struct *tsk)
{
int state;
struct task_struct *t;
- struct list_head ptrace_dead, *_p, *_n;
struct pid *pgrp;
if (signal_pending(tsk) && !(tsk->signal->flags & SIGNAL_GROUP_EXIT)
@@ -751,8 +765,6 @@ static void exit_notify(struct task_struct *tsk)
spin_unlock_irq(&tsk->sighand->siglock);
}
- write_lock_irq(&tasklist_lock);
-
/*
* This does two things:
*
@@ -761,12 +773,9 @@ static void exit_notify(struct task_struct *tsk)
* as a result of our exiting, and if they have any stopped
* jobs, send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2)
*/
+ forget_original_parent(tsk);
- INIT_LIST_HEAD(&ptrace_dead);
- forget_original_parent(tsk, &ptrace_dead);
- BUG_ON(!list_empty(&tsk->children));
- BUG_ON(!list_empty(&tsk->ptrace_children));
-
+ write_lock_irq(&tasklist_lock);
/*
* Check to see if any process groups have become orphaned
* as a result of our exiting, and if they have any stopped
@@ -831,12 +840,6 @@ static void exit_notify(struct task_struct *tsk)
write_unlock_irq(&tasklist_lock);
- list_for_each_safe(_p, _n, &ptrace_dead) {
- list_del_init(_p);
- t = list_entry(_p, struct task_struct, ptrace_list);
- release_task(t);
- }
-
/* If the process is dead, release it - nobody will wait for it */
if (state == EXIT_DEAD)
release_task(tsk);