diff --git a/sys/kern/kern_vnodedumper.c b/sys/kern/kern_vnodedumper.c
--- a/sys/kern/kern_vnodedumper.c
+++ b/sys/kern/kern_vnodedumper.c
@@ -133,8 +133,10 @@
 	if (error != 0)
 		goto out;
 
+	curthread->td_pflags2 |= TDP2_SAN_QUIET;
 	dump_savectx();
 	error = minidumpsys(livedi, true);
+	curthread->td_pflags2 &= ~TDP2_SAN_QUIET;
 
 	EVENTHANDLER_INVOKE(livedumper_finish);
 out:
diff --git a/sys/kern/subr_asan.c b/sys/kern/subr_asan.c
--- a/sys/kern/subr_asan.c
+++ b/sys/kern/subr_asan.c
@@ -405,6 +405,9 @@
 
 	if (__predict_false(!kasan_enabled))
 		return;
+	if (__predict_false(curthread != NULL &&
+	    (curthread->td_pflags2 & TDP2_SAN_QUIET) != 0))
+		return;
 	if (__predict_false(size == 0))
 		return;
 	if (__predict_false(kasan_md_unsupported(addr)))
diff --git a/sys/kern/subr_msan.c b/sys/kern/subr_msan.c
--- a/sys/kern/subr_msan.c
+++ b/sys/kern/subr_msan.c
@@ -179,6 +179,9 @@
 
 	if (__predict_false(KERNEL_PANICKED() || kdb_active || kmsan_reporting))
 		return;
+	if (__predict_false(curthread != NULL &&
+	    (curthread->td_pflags2 & TDP2_SAN_QUIET) != 0))
+		return;
 
 	kmsan_reporting = true;
 	__compiler_membar();
@@ -232,6 +235,9 @@
 
 	if (__predict_false(KERNEL_PANICKED() || kdb_active || kmsan_reporting))
 		return;
+	if (__predict_false(curthread != NULL &&
+	    (curthread->td_pflags2 & TDP2_SAN_QUIET) != 0))
+		return;
 
 	kmsan_reporting = true;
 	__compiler_membar();
diff --git a/sys/sys/proc.h b/sys/sys/proc.h
--- a/sys/sys/proc.h
+++ b/sys/sys/proc.h
@@ -567,6 +567,7 @@
 #define	TDP2_SBPAGES	0x00000001 /* Owns sbusy on some pages */
 #define	TDP2_COMPAT32RB	0x00000002 /* compat32 ABI for robust lists */
 #define	TDP2_ACCT	0x00000004 /* Doing accounting */
+#define	TDP2_SAN_QUIET	0x00000008 /* Disable warnings from K(A|M)SAN */
 
 /*
  * Reasons that the current thread can not be run yet.