Index: FreeBSD/sys/kern/kern_sig.c
===================================================================
--- FreeBSD/sys/kern/kern_sig.c
+++ FreeBSD/sys/kern/kern_sig.c
@@ -1527,6 +1527,14 @@
 	struct proc *p = td->td_proc;
 	int has_sig, sig;
 
+	/*
+	 * Ensure the sigfastblock value is up to date.
+	 * In general, it seems unlikely that someone would
+	 * want to block signals while suspending to wait for them,
+	 * so it might be worth adding a check for that.
+	 */
+	sigfastblock_fetch(td);
+
 	/*
 	 * When returning from sigsuspend, we want
 	 * the old mask to be restored after the