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From: Mark Johnston <markj@FreeBSD.org>
Date: Tue, 18 Mar 2014 00:55:20 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r263283 - stable/10/sys/kern
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Author: markj
Date: Tue Mar 18 00:55:19 2014
New Revision: 263283
URL: http://svnweb.freebsd.org/changeset/base/263283

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/10/sys/kern/kern_sdt.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/kern/kern_sdt.c
==============================================================================
--- stable/10/sys/kern/kern_sdt.c	Tue Mar 18 00:38:36 2014	(r263282)
+++ stable/10/sys/kern/kern_sdt.c	Tue Mar 18 00:55:19 2014	(r263283)
@@ -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();
 }