Index: sys/arch/x86/x86/syscall.c
===================================================================
RCS file: /cvsroot/src/sys/arch/x86/x86/syscall.c,v
retrieving revision 1.18
diff -p -u -r1.18 syscall.c
--- sys/arch/x86/x86/syscall.c	6 Apr 2019 11:54:21 -0000	1.18
+++ sys/arch/x86/x86/syscall.c	30 Aug 2019 19:32:00 -0000
@@ -47,6 +47,10 @@ __KERNEL_RCSID(0, "$NetBSD: syscall.c,v 
 #include <machine/psl.h>
 #include <machine/userret.h>
 
+// XXXMRG
+#include <machine/db_machdep.h>
+#include <ddb/db_interface.h>
+
 #include "opt_dtrace.h"
 
 #ifndef __x86_64__
@@ -143,6 +147,12 @@ syscall(struct trapframe *frame)
 		X86_TF_RFLAGS(frame) &= ~PSL_C;	/* carry bit */
 	} else {
 		switch (error) {
+#if 1 /* COMPAT_DRM */
+		case ELAST+1: /* linux-y ERESTARTSYS */
+			uprintf("%s: got linux ERESTARTSYS\n", __func__);
+			db_stacktrace();
+#endif
+		/* FALLTHROUGH */
 		case ERESTART:
 			/*
 			 * The offset to adjust the PC by depends on whether we