1 files changed, 5 insertions, 1 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index 7e33f8c583e6..ed804a470dcd 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1194,7 +1194,11 @@ force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
                         recalc_sigpending_and_wake(t);
                 }
         }
-        if (action->sa.sa_handler == SIG_DFL)
+        /*
+         * Don't clear SIGNAL_UNKILLABLE for traced tasks, users won't expect
+         * debugging to leave init killable.
+         */
+        if (action->sa.sa_handler == SIG_DFL && !t->ptrace)
                 t->signal->flags &= ~SIGNAL_UNKILLABLE;
         ret = specific_send_sig_info(sig, info, t);
         spin_unlock_irqrestore(&t->sighand->siglock, flags);