1 files changed, 8 insertions, 0 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index 2a74fe87c0dd..1c8814481a11 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1575,7 +1575,15 @@ static void ptrace_stop(int exit_code, int clear_code, siginfo_t *info)
         read_lock(&tasklist_lock);
         if (may_ptrace_stop()) {
                 do_notify_parent_cldstop(current, CLD_TRAPPED);
+                /*
+                 * Don't want to allow preemption here, because
+                 * sys_ptrace() needs this task to be inactive.
+                 *
+                 * XXX: implement read_unlock_no_resched().
+                 */
+                preempt_disable();
                 read_unlock(&tasklist_lock);
+                preempt_enable_no_resched();
                 schedule();
         } else {
                 /*