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

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Message-ID: <20250809043659.4068-1-hdanton@sina.com>
Date: Sat,  9 Aug 2025 12:36:57 +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
@@ -717,6 +717,8 @@ static void kcm_tx_work(struct work_stru
 
 	lock_sock(sk);
 
+	if (kcm->tx_stopped)
+		goto out;
 	/* Primarily for SOCK_DGRAM sockets, also handle asynchronous tx
 	 * aborts
 	 */
@@ -1733,6 +1735,7 @@ static int kcm_release(struct socket *so
 
 	sock->sk = NULL;
 
+	flush_work(&kcm->tx_work);
 	kcm_done(kcm);
 
 	return 0;
--