divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4621 Comm: syz-executor.4 Not tainted 5.10.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__tcp_select_window+0x509/0xa60 net/ipv4/tcp_output.c:3008
Code: 44 89 ff e8 39 33 fb f9 45 39 e7 0f 8d 20 ff ff ff e8 5b 3b fb f9 44 89 e3 e9 13 ff ff ff e8 4e 3b fb f9 44 89 e0 44 89 e3 99 <f7> 7c 24 04 29 d3 e9 fc fe ff ff e8 37 3b fb f9 44 89 f1 48 89 ea
RSP: 0018:ffffc90002e5f7c0 EFLAGS: 00010216
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90011931000
RDX: 0000000000000000 RSI: ffffffff8774f4a2 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff8880601aac0b
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 1ffff920005cbefc R14: 0000000000000000 R15: 0000000000000000
FS:  00007f67f7424700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000505550 CR3: 0000000011779000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tcp_cleanup_rbuf+0x486/0x5b0 net/ipv4/tcp.c:1587
 mptcp_send_ack+0x165/0x1b0 net/mptcp/protocol.c:444
 mptcp_recvmsg+0x1081/0x1ab0 net/mptcp/protocol.c:1607
 inet_recvmsg+0x11b/0x5d0 net/ipv4/af_inet.c:848
 sock_recvmsg_nosec net/socket.c:885 [inline]
 sock_recvmsg net/socket.c:903 [inline]
 sock_recvmsg net/socket.c:899 [inline]
 ____sys_recvmsg+0x2c4/0x600 net/socket.c:2554
 ___sys_recvmsg+0x127/0x200 net/socket.c:2596
 __sys_recvmsg+0xe2/0x1a0 net/socket.c:2632
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45deb9
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f67f7423c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00000000000270c0 RCX: 000000000045deb9
RDX: 0000000000000000 RSI: 0000000020000580 RDI: 0000000000000003
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffc90850e5f R14: 00007f67f74249c0 R15: 000000000118bf2c
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