[PATCH 1/1] exec: make de_thread() killable

[Oleg Nesterov <oleg@redhat.com>]

Change de_thread() to use KILLABLE rather than UNINTERRUPTIBLE
while waiting for other threads. The only complication is that
we should clear ->group_exit_task and ->notify_count before we
return, and we should do this under tasklist_lock. -EAGAIN is
used to match the initial signal_group_exit() check/return, it
doesn't really matter.

This fixes the (unlikely) race with coredump. de_thread() checks
signal_group_exit() before it starts to kill the subthreads, but
this can't help if another CLONE_VM (but non CLONE_THREAD) task
starts the coredumping after de_thread() unlocks ->siglock. In
this case the killed sub-thread can block in exit_mm() waiting
for coredump_finish(), execing thread waits for that sub-thead,
and execing thread waits for execing thread. Deadlock.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
 fs/exec.c |   16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)

--- a/fs/exec.c
+++ b/fs/exec.c
@@ -878,9 +878,11 @@ static int de_thread(struct task_struct 
 		sig->notify_count--;
 
 	while (sig->notify_count) {
-		__set_current_state(TASK_UNINTERRUPTIBLE);
+		__set_current_state(TASK_KILLABLE);
 		spin_unlock_irq(lock);
 		schedule();
+		if (unlikely(__fatal_signal_pending(tsk)))
+			goto killed;
 		spin_lock_irq(lock);
 	}
 	spin_unlock_irq(lock);
@@ -898,9 +900,11 @@ static int de_thread(struct task_struct 
 			write_lock_irq(&tasklist_lock);
 			if (likely(leader->exit_state))
 				break;
-			__set_current_state(TASK_UNINTERRUPTIBLE);
+			__set_current_state(TASK_KILLABLE);
 			write_unlock_irq(&tasklist_lock);
 			schedule();
+			if (unlikely(__fatal_signal_pending(tsk)))
+				goto killed;
 		}
 
 		/*
@@ -994,6 +998,14 @@ no_thread_group:
 
 	BUG_ON(!thread_group_leader(tsk));
 	return 0;
+
+killed:
+	/* protects against exit_notify() and __exit_signal() */
+	read_lock(&tasklist_lock);
+	sig->group_exit_task = NULL;
+	sig->notify_count = 0;
+	read_unlock(&tasklist_lock);
+	return -EAGAIN;
 }
 
 char *get_task_comm(char *buf, struct task_struct *tsk)