linux-kernel - Re: [syzbot] [udf?] WARNING: bad unlock balance in __wait_on_freeing

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Message-ID: <tencent_A85BBA74BBCA339C9E931B4E4B281B4B2508@qq.com>
Date: Thu, 22 Jan 2026 10:16:22 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+bcfb99c4698edf7a1f52@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [udf?] WARNING: bad unlock balance in __wait_on_freeing_inode

#syz test

diff --git a/fs/inode.c b/fs/inode.c
index dae43a8de7e0..5d1566ffbbfc 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1851,7 +1851,9 @@ int insert_inode_locked(struct inode *inode)
 			return 0;
 		}
 		if (inode_state_read(old) & (I_FREEING | I_WILL_FREE)) {
+			rcu_read_lock();
 			__wait_on_freeing_inode(old, true, false);
+			rcu_read_unlock();
 			old = NULL;
 			goto repeat;
 		}