[PATCH] audit: wait_for_auditd() should use TASK_UNINTERRUPTIBLE

[Oleg Nesterov <oleg@redhat.com>]

audit_log_start() does wait_for_auditd() in a loop until
audit_backlog_wait_time passes or audit_skb_queue has a room.

If signal_pending() is true this becomes a busy-wait loop,
schedule() in TASK_INTERRUPTIBLE won't block.

Reported-by: Guy Streeter <streeter@redhat.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>

--- x/kernel/audit.c
+++ x/kernel/audit.c
@@ -1056,7 +1056,7 @@ static inline void audit_get_stamp(struc
 static void wait_for_auditd(unsigned long sleep_time)
 {
 	DECLARE_WAITQUEUE(wait, current);
-	set_current_state(TASK_INTERRUPTIBLE);
+	set_current_state(TASK_UNINTERRUPTIBLE);
 	add_wait_queue(&audit_backlog_wait, &wait);
 
 	if (audit_backlog_limit &&