diff -Naur linux-LSDK-20.04-V5.4-orig/fs/ubifs/super.c linux-LSDK-20.04-V5.4/fs/ubifs/super.c
--- linux-LSDK-20.04-V5.4-orig/fs/ubifs/super.c	2020-02-26 10:13:26.000000000 +0100
+++ linux-LSDK-20.04-V5.4/fs/ubifs/super.c	2021-08-27 15:32:14.573982594 +0200
@@ -1811,7 +1811,6 @@
 		kthread_stop(c->bgt);
 		c->bgt = NULL;
 	}
-	free_wbufs(c);
 	kfree(c->write_reserve_buf);
 	c->write_reserve_buf = NULL;
 	vfree(c->ileb_buf);