linux-kernel - Re: [syzbot] [fs?] WARNING in free_mnt

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Message-ID: <20251002005443.7942-1-hdanton@sina.com>
Date: Thu,  2 Oct 2025 08:54:42 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+7d23dc5cd4fa132fb9f3@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [fs?] WARNING in free_mnt_ns

> Date: Tue, 30 Sep 2025 13:17:34 -0700	[thread overview]
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    449c2b302c8e Merge tag 'vfs-6.18-rc1.async' of git://git.k..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=15b43858580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=595e5938a1dd5b4e
> dashboard link: https://syzkaller.appspot.com/bug?extid=7d23dc5cd4fa132fb9f3
> compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11c9ad04580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=160bf27c580000

#syz test

--- l/fs/namespace.c
+++ n/fs/namespace.c
@@ -4165,7 +4165,6 @@ struct mnt_namespace *copy_mnt_ns(u64 fl
 	new = copy_tree(old, old->mnt.mnt_root, copy_flags);
 	if (IS_ERR(new)) {
 		namespace_unlock();
-		ns_common_free(ns);
 		dec_mnt_namespaces(new_ns->ucounts);
 		mnt_ns_release(new_ns);
 		return ERR_CAST(new);
--