syzbot

divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8489 Comm: syz-executor726 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 29 35 fb f9 45 39 e7 0f 8d 20 ff ff ff e8 4b 3d fb f9 44 89 e3 e9 13 ff ff ff e8 3e 3d fb f9 44 89 e0 44 89 e3 99 <f7> 7c 24 04 29 d3 e9 fc fe ff ff e8 27 3d fb f9 44 89 f1 48 89 ea
RSP: 0018:ffffc90003aaf678 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8774f250
RDX: 0000000000000000 RSI: ffffffff8774f2b2 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff888018dc020b
R10: 0000000000000000 R11: 1ffffffff1cfe604 R12: 0000000000000000
R13: 1ffff92000755ed3 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000002359880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200000c0 CR3: 0000000011561000 CR4: 00000000001506e0
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:884 [inline]
 sock_recvmsg net/socket.c:902 [inline]
 sock_recvmsg net/socket.c:898 [inline]
 ____sys_recvmsg+0x2c4/0x600 net/socket.c:2553
 ___sys_recvmsg+0x127/0x200 net/socket.c:2595
 do_recvmmsg+0x24d/0x6c0 net/socket.c:2695
 __sys_recvmmsg net/socket.c:2774 [inline]
 __do_sys_recvmmsg net/socket.c:2797 [inline]
 __se_sys_recvmmsg net/socket.c:2790 [inline]
 __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2790
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4402c9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe3c286d58 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402c9
RDX: 0000000000000002 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000401ad0
R13: 0000000000401b60 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 565476b36a831272 ]---
RIP: 0010:__tcp_select_window+0x509/0xa60 net/ipv4/tcp_output.c:3008
Code: 44 89 ff e8 29 35 fb f9 45 39 e7 0f 8d 20 ff ff ff e8 4b 3d fb f9 44 89 e3 e9 13 ff ff ff e8 3e 3d fb f9 44 89 e0 44 89 e3 99 <f7> 7c 24 04 29 d3 e9 fc fe ff ff e8 27 3d fb f9 44 89 f1 48 89 ea
RSP: 0018:ffffc90003aaf678 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8774f250
RDX: 0000000000000000 RSI: ffffffff8774f2b2 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff888018dc020b
R10: 0000000000000000 R11: 1ffffffff1cfe604 R12: 0000000000000000
R13: 1ffff92000755ed3 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000002359880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f640c03d028 CR3: 0000000011561000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400