Merge branch 'master' into for-linus

1 files changed, 5 insertions, 2 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index ceffc67b564a..671ed56e0a49 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -771,9 +771,12 @@ static void forget_original_parent(struct task_struct *father)
         struct task_struct *p, *n, *reaper;
         LIST_HEAD(dead_children);
 
-        exit_ptrace(father);
-
         write_lock_irq(&tasklist_lock);
+        /*
+         * Note that exit_ptrace() and find_new_reaper() might
+         * drop tasklist_lock and reacquire it.
+         */
+        exit_ptrace(father);
         reaper = find_new_reaper(father);
 
         list_for_each_entry_safe(p, n, &father->children, sibling) {