divide error: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 15837 Comm: syz-executor.4 Not tainted 5.10.0-rc4-next-20201123-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 89 d8 f8 f9 45 39 e7 0f 8d 20 ff ff ff e8 ab e0 f8 f9 44 89 e3 e9 13 ff ff ff e8 9e e0 f8 f9 44 89 e0 44 89 e3 99 7c 24 04 29 d3 e9 fc fe ff ff e8 87 e0 f8 f9 44 89 f1 48 89 ea RSP: 0018:ffffc90001b8f678 EFLAGS: 00010212 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9001173c000 RDX: 0000000000000000 RSI: ffffffff8777aa82 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88806419ba4b R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 1ffff92000371ed3 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fbcb5afb700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000016a9e60 CR3: 00000000275c9000 CR4: 00000000001526f0 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+0x1104/0x1b60 net/mptcp/protocol.c:1607 inet6_recvmsg+0x11b/0x5d0 net/ipv6/af_inet6.c:654 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:2562 ___sys_recvmsg+0x127/0x200 net/socket.c:2604 do_recvmmsg+0x24d/0x6c0 net/socket.c:2704 __sys_recvmmsg net/socket.c:2783 [inline] __do_sys_recvmmsg net/socket.c:2806 [inline] __se_sys_recvmmsg net/socket.c:2799 [inline] __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2799 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:00007fbcb5afac78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 0000000000027080 RCX: 000000000045deb9 RDX: 0000000000000002 RSI: 0000000020005000 RDI: 0000000000000003 RBP: 000000000118bf70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000018701 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007fffb8f0eeef R14: 00007fbcb5afb9c0 R15: 000000000118bf2c Modules linked in: ---[ end trace 308510e6c9039f1a ]--- RIP: 0010:__tcp_select_window+0x509/0xa60 net/ipv4/tcp_output.c:3008 Code: 44 89 ff e8 89 d8 f8 f9 45 39 e7 0f 8d 20 ff ff ff e8 ab e0 f8 f9 44 89 e3 e9 13 ff ff ff e8 9e e0 f8 f9 44 89 e0 44 89 e3 99 7c 24 04 29 d3 e9 fc fe ff ff e8 87 e0 f8 f9 44 89 f1 48 89 ea RSP: 0018:ffffc90001b8f678 EFLAGS: 00010212 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9001173c000 RDX: 0000000000000000 RSI: ffffffff8777aa82 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88806419ba4b R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 1ffff92000371ed3 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fbcb5afb700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e526000 CR3: 00000000275c9000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400