From bcd8cd859e694bc4a4dfb6fdb8f55de3a96833b4 Mon Sep 17 00:00:00 2001
From: Mark Johnston <markj@FreeBSD.org>
Date: Wed, 1 Mar 2023 10:07:56 -0500
Subject: [PATCH] buf: Make buf_daemon_shutdown() a no-op after a panic

As in commit 9d7cc536e261a7, there is no need to do anything in this
context.

MFC after:	1 week
---
 sys/kern/vfs_bio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c
index b40ee382c42..f1089964a04 100644
--- a/sys/kern/vfs_bio.c
+++ b/sys/kern/vfs_bio.c
@@ -3419,6 +3419,9 @@ buf_daemon_shutdown(void *arg __unused, int howto __unused)
 {
 	int error;
 
+	if (KERNEL_PANICKED())
+		return;
+
 	mtx_lock(&bdlock);
 	bd_shutdown = true;
 	wakeup(&bd_request);