Index: kqemu.c
===================================================================
--- kqemu.c	(revision 4734)
+++ kqemu.c	(working copy)
@@ -771,8 +771,12 @@
         ret = -1;
     }
 #else
-    ioctl(kqemu_fd, KQEMU_EXEC, kenv);
-    ret = kenv->retval;
+    if (ioctl(kqemu_fd, KQEMU_EXEC, kenv) < 0) {
+        fprintf(stderr, "Error while running code in QEMU acceleration layer: %s\n", strerror(errno));
+        ret = -1;
+    } else {
+        ret = kenv->retval;
+    }
 #endif
     if (env->cpuid_features & CPUID_FXSR)
         save_native_fp_fxsave(env);