linux-kernel - Re: [syzbot] [ext4?] WARNING in ext4_xattr_inode_lookup

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Message-ID: <tencent_A00DB025D08D8E12005DA45DED1965CF9C07@qq.com>
Date: Wed, 29 May 2024 08:14:09 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+fe42a669c87e4a980051@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ext4?] WARNING in ext4_xattr_inode_lookup_create

please test wr in ext4_xattr_inode_lookup_create

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 8f6a15f095a6

diff --git a/fs/dcache.c b/fs/dcache.c
index 407095188f83..e2f1a3f92ce9 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1551,8 +1551,8 @@ void shrink_dcache_for_umount(struct super_block *sb)
 	WARN(down_read_trylock(&sb->s_umount), "s_umount should've been locked");
 
 	dentry = sb->s_root;
-	sb->s_root = NULL;
 	do_one_tree(dentry);
+	sb->s_root = NULL;
 
 	while (!hlist_bl_empty(&sb->s_roots)) {
 		dentry = dget(hlist_bl_entry(hlist_bl_first(&sb->s_roots), struct dentry, d_hash));