From 054b57a74087a632efe0724f861093afbfa9054b Mon Sep 17 00:00:00 2001
From: Marcel Moolenaar <marcel@FreeBSD.org>
Date: Wed, 2 Jul 2014 22:13:07 +0000
Subject: [PATCH] Drop KTR records when we're in the debugger so that the
 debugger isn't changing or overwriting the trace buffer. When KTR is enabled
 for things like traps or pmap functions, the amount of logging can be
 substantial.

---
 sys/kern/kern_ktr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/kern/kern_ktr.c b/sys/kern/kern_ktr.c
index 60e0a86a49f4..2a405936320d 100644
--- a/sys/kern/kern_ktr.c
+++ b/sys/kern/kern_ktr.c
@@ -41,6 +41,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/alq.h>
 #include <sys/cons.h>
 #include <sys/cpuset.h>
+#include <sys/kdb.h>
 #include <sys/kernel.h>
 #include <sys/ktr.h>
 #include <sys/libkern.h>
@@ -323,7 +324,7 @@ ktr_tracepoint(u_int mask, const char *file, int line, const char *format,
 #endif
 	int cpu;
 
-	if (panicstr)
+	if (panicstr || kdb_active)
 		return;
 	if ((ktr_mask & mask) == 0 || ktr_buf == NULL)
 		return;