diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -2856,6 +2856,8 @@
 	p->p_flag2 &= ~P2_PTRACE_FSTP;
 	p->p_flag |= P_STOPPED_SIG | P_STOPPED_TRACE;
 	sig_suspend_threads(td, p);
+	if (td == NULL)
+		thread_stopped(p);
 }
 
 /*