WARNING in mptcp_reset_timer

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    7c8ca812 Add linux-next specific files for 20201117
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14ccfce2500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ff4bc71371dc5b13
dashboard link: https://syzkaller.appspot.com/bug?extid=42aa53dafb66a07e5a24
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1342e36e500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17f29bba500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+42aa53dafb66a07e5a24@xxxxxxxxxxxxxxxxxxxxxxxxx

------------[ cut here ]------------
WARNING: CPU: 1 PID: 8718 at net/mptcp/protocol.c:719 mptcp_reset_timer+0x12a/0x160 net/mptcp/protocol.c:719
Modules linked in:
CPU: 1 PID: 8718 Comm: kworker/1:3 Not tainted 5.10.0-rc4-next-20201117-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events mptcp_worker
RIP: 0010:mptcp_reset_timer+0x12a/0x160 net/mptcp/protocol.c:719
Code: e8 0b 87 43 fe e8 46 71 c5 f8 48 b8 00 00 00 00 00 fc ff df 48 c7 04 03 00 00 00 00 48 83 c4 40 5b 5d 41 5c c3 e8 26 71 c5 f8 <0f> 0b 41 bc 14 00 00 00 eb 98 e8 c7 d3 07 f9 e9 30 ff ff ff 48 c7
RSP: 0018:ffffc90001adfa38 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff9200035bf47 RCX: ffffffff88ab2357
RDX: ffff88801ae14f80 RSI: ffffffff88ab23ba RDI: 0000000000000007
RBP: ffff888024200000 R08: 0000000000000000 R09: ffff88802420084f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000281400 R14: ffff888024200000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f994238f010 CR3: 0000000028d92000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 mptcp_push_pending+0x1351/0x17c0 net/mptcp/protocol.c:1266
 mptcp_worker+0x385/0x1a10 net/mptcp/protocol.c:1877
 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418
 kthread+0x3af/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296


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