PERFORCE change 99108 for review

[John Birrell]

http://perforce.freebsd.org/chv.cgi?CH=99108

Change 99108 by jb at jb_freebsd2 on 2006/06/13 01:16:03

	Add a bit of debug code while I'm still searching for things that
	cause double faults in fbt.

Affected files ...

.. //depot/projects/dtrace/src/sys/cddl/dev/dtrace/dtrace_ioctl.c#14 edit

Differences ...

==== //depot/projects/dtrace/src/sys/cddl/dev/dtrace/dtrace_ioctl.c#14 (text+ko) ====

@@ -34,6 +34,18 @@
 
 	SDT_PROBE(dtrace, ioctl, entry, cmd, addr, 0, 0, 0);
 
+#if defined(__i386__)
+	/*
+	 * Check if any probe recursions have occurred. These are more
+	 * likely to cause a crash, but let's try to report them if we
+	 * can.
+	 */
+	if (dtrace_in_probe_addr != 0) {
+		printf("dtrace_in_probe_addr 0x%lx\n", (u_long) dtrace_in_probe_addr);
+		dtrace_in_probe_addr = 0;
+	}
+#endif
+
 	switch (cmd) {
 	case DTRACEIOC_AGGDESC: {
 		dtrace_aggdesc_t **paggdesc = (dtrace_aggdesc_t **) addr;