D33167.diff
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	diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c
	--- a/sys/kern/vfs_bio.c
	+++ b/sys/kern/vfs_bio.c
	@@ -1458,9 +1458,16 @@
	printf("Final sync complete\n");

	/*
	- * Unmount filesystems. Swapoff before unmount,
	- * because file-backed swap is non-operational after unmount
	- * of the underlying filesystem.
	+ * Unmount filesystems and perform swapoff, to quiesce
	+ * the system as much as possible. In particular, no
	+ * I/O should be initiated from top levels since it
	+ * might be abruptly terminated by reset, or otherwise
	+ * erronously handled because other parts of the
	+ * system are disabled.
	+ *
	+ * Swapoff before unmount, because file-backed swap is
	+ * non-operational after unmount of the underlying
	+ * filesystem.
	*/
	if (!KERNEL_PANICKED()) {
	swapoff_all();