linux-kernel - Re: [syzbot] [net?] WARNING: ODEBUG bug in __sk

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Message-ID: <20250808135614.4022-1-hdanton@sina.com>
Date: Fri,  8 Aug 2025 21:56:11 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+d199b52665b6c3069b94@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING: ODEBUG bug in __sk_destruct (3)

> Date: Fri, 08 Aug 2025 04:24:30 -0700	[thread overview]
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    7abc678e3084 Merge tag 'pmdomain-v6.16-rc2' of git://git.k..
> git tree:       bpf
> console output: https://syzkaller.appspot.com/x/log.txt?x=11b0a4f0580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=12b5044868deb866
> dashboard link: https://syzkaller.appspot.com/bug?extid=d199b52665b6c3069b94
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14a20f22580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12af2f22580000

#syz test upstream master

--- x/net/kcm/kcmsock.c
+++ y/net/kcm/kcmsock.c
@@ -1714,7 +1714,7 @@ static int kcm_release(struct socket *so
 	/* Cancel work. After this point there should be no outside references
 	 * to the kcm socket.
 	 */
-	cancel_work_sync(&kcm->tx_work);
+	flush_work(&kcm->tx_work);
 
 	lock_sock(sk);
 	psock = kcm->tx_psock;
--