util: do a control shot from BUG_ON

SIGABRT may be blocked. We do that in the restorer.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/util.h

@@ -50,6 +50,7 @@
 		if ((condition)) {					\
 			pr_err("BUG at %s:%d\n", __FILE__, __LINE__);	\
 			raise(SIGABRT);					\
+			*(volatile unsigned long *)NULL = 0xdead0000 + __LINE__; \
 		}							\
 	} while (0)