svn commit: r263284 - stable/9/sys/kern

[Mark Johnston]

Author: markj
Date: Tue Mar 18 00:55:40 2014
New Revision: 263284
URL: http://svnweb.freebsd.org/changeset/base/263284

Log:
  MFC r262325:
  Print a backtrace if the SDT(9) stub gets called so that there's at least
  some hope of figuring out how it happened.

Modified:
  stable/9/sys/kern/kern_sdt.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/kern/kern_sdt.c
==============================================================================
--- stable/9/sys/kern/kern_sdt.c	Tue Mar 18 00:55:19 2014	(r263283)
+++ stable/9/sys/kern/kern_sdt.c	Tue Mar 18 00:55:40 2014	(r263284)
@@ -29,6 +29,7 @@
 
 #include <sys/param.h>
 #include <sys/systm.h>
+#include <sys/kdb.h>
 #include <sys/sdt.h>
 
 SDT_PROVIDER_DEFINE(sdt);
@@ -49,5 +50,6 @@ sdt_probe_stub(uint32_t id, uintptr_t ar
     uintptr_t arg2, uintptr_t arg3, uintptr_t arg4)
 {
 
-	printf("sdt_probe_stub: Why did this get called?\n");
+	printf("sdt_probe_stub: unexpectedly called\n");
+	kdb_backtrace();
 }