------------[ cut here ]------------
WARNING: CPU: 3 PID: 5298 at net/mptcp/protocol.c:1001 __mptcp_clean_una+0x80b/0xc60 net/mptcp/protocol.c:1001
Modules linked in:

CPU: 3 PID: 5298 Comm: kworker/3:4 Not tainted 6.8.0-rc6-syzkaller-00024-ge326df53af00 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events mptcp_worker
RIP: 0010:__mptcp_clean_una+0x80b/0xc60 net/mptcp/protocol.c:1001
Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 17 03 00 00 48 c7 85 b8 08 00 00 00 00 00 00 e9 47 fc ff ff e8 e6 cd ee f6 90 <0f> 0b 90 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 28 48 c1 ea 03
RSP: 0018:ffffc90004087a10 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880124f0000 RCX: ffffffff8a9d1053
RDX: ffff88801f140000 RSI: ffffffff8a9d167a RDI: 0000000000000001
RBP: ffff888012337300 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000003 R12: ffff888012337ca8
R13: dffffc0000000000 R14: 2be45df6ca578897 R15: ffff888012337ca8
FS:  0000000000000000(0000) GS:ffff88802c500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000ff9d4ed4 CR3: 000000004a9b2000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __mptcp_clean_una_wakeup+0x5e/0x280 net/mptcp/protocol.c:1049
 mptcp_clean_una_wakeup net/mptcp/protocol.c:1056 [inline]
 __mptcp_retrans+0xb5/0xa40 net/mptcp/protocol.c:2587
 mptcp_worker+0xa28/0x1390 net/mptcp/protocol.c:2739
 process_one_work+0x835/0x1570 kernel/workqueue.c:2633
 process_scheduled_works kernel/workqueue.c:2706 [inline]
 worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787
 kthread+0x2c6/0x3b0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
 </TASK>