Index: head/sys/compat/linux/linux_fork.c
===================================================================
--- head/sys/compat/linux/linux_fork.c
+++ head/sys/compat/linux/linux_fork.c
@@ -328,7 +328,6 @@
 
 	PROC_LOCK(p);
 	p->p_flag |= P_HADTHREADS;
-	newtd->td_sigmask = td->td_sigmask;
 	bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
 
 	if (args->flags & LINUX_CLONE_PARENT)