nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. divide error: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 3593 Comm: syz-executor524 Not tainted 5.17.0-rc4-syzkaller-00051-gc5d9ae265b10 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:tcp_reno_cong_avoid+0x289/0x560 net/ipv4/tcp_cong.c:450 Code: 89 1c 24 89 df 89 ee e8 55 ba c6 f8 39 eb 73 11 e8 ac b8 c6 f8 48 bd 00 00 00 00 00 fc ff df eb 3b e8 9b b8 c6 f8 89 d8 31 d2 f5 89 c6 89 d3 48 bd 00 00 00 00 00 fc ff df 41 8a 04 2f 84 c0 RSP: 0018:ffffc90001a7f410 EFLAGS: 00010246 RAX: 0000000000000011 RBX: 0000000000000011 RCX: ffff888018999d00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000011 RBP: 0000000000000000 R08: ffffffff88bf00ab R09: fffffbfff1c00866 R10: fffffbfff1c00866 R11: 0000000000000000 R12: ffff88801d219584 R13: ffff88801d218c00 R14: 1ffff11003a432b0 R15: 1ffff11003a432b0 FS: 0000555555f613c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020200000 CR3: 00000000718eb000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tcp_cdg_cong_avoid+0x72c/0x17b0 net/ipv4/tcp_cdg.c:293 tcp_cong_avoid net/ipv4/tcp_input.c:3133 [inline] tcp_cong_control net/ipv4/tcp_input.c:3490 [inline] tcp_ack+0x2478/0x42e0 net/ipv4/tcp_input.c:3891 tcp_rcv_established+0x7d7/0x22b0 net/ipv4/tcp_input.c:5938 tcp_v4_do_rcv+0x476/0xa10 net/ipv4/tcp_ipv4.c:1719 sk_backlog_rcv include/net/sock.h:1037 [inline] __release_sock+0x1d8/0x4c0 net/core/sock.c:2779 __sk_flush_backlog+0x22/0x30 net/core/sock.c:2799 sk_flush_backlog include/net/sock.h:1127 [inline] tcp_sendmsg_locked+0x3397/0x4820 net/ipv4/tcp.c:1294 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1449 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg net/socket.c:725 [inline] __sys_sendto+0x42e/0x5b0 net/socket.c:2040 __do_sys_sendto net/socket.c:2052 [inline] __se_sys_sendto net/socket.c:2048 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2048 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f9ae71c38d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 31 18 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffd9fca9c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f9ae71c38d9 RDX: 00000000fffffd46 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 00007fffd9fcaa60 R08: 0000000000000000 R09: 00000000000001f4 R10: 00000000000081f4 R11: 0000000000000246 R12: 0000000000000046 R13: 00007fffd9fcaa2a R14: 00007fffd9fcaa40 R15: 00007f9ae7238480 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:tcp_reno_cong_avoid+0x289/0x560 net/ipv4/tcp_cong.c:450 Code: 89 1c 24 89 df 89 ee e8 55 ba c6 f8 39 eb 73 11 e8 ac b8 c6 f8 48 bd 00 00 00 00 00 fc ff df eb 3b e8 9b b8 c6 f8 89 d8 31 d2 f5 89 c6 89 d3 48 bd 00 00 00 00 00 fc ff df 41 8a 04 2f 84 c0 RSP: 0018:ffffc90001a7f410 EFLAGS: 00010246 RAX: 0000000000000011 RBX: 0000000000000011 RCX: ffff888018999d00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000011 RBP: 0000000000000000 R08: ffffffff88bf00ab R09: fffffbfff1c00866 R10: fffffbfff1c00866 R11: 0000000000000000 R12: ffff88801d219584 R13: ffff88801d218c00 R14: 1ffff11003a432b0 R15: 1ffff11003a432b0 FS: 0000555555f613c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055793e29f108 CR3: 00000000718eb000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 1c 24 mov %ebx,(%rsp) 3: 89 df mov %ebx,%edi 5: 89 ee mov %ebp,%esi 7: e8 55 ba c6 f8 callq 0xf8c6ba61 c: 39 eb cmp %ebp,%ebx e: 73 11 jae 0x21 10: e8 ac b8 c6 f8 callq 0xf8c6b8c1 15: 48 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%rbp 1c: fc ff df 1f: eb 3b jmp 0x5c 21: e8 9b b8 c6 f8 callq 0xf8c6b8c1 26: 89 d8 mov %ebx,%eax 28: 31 d2 xor %edx,%edx * 2a: f7 f5 div %ebp <-- trapping instruction 2c: 89 c6 mov %eax,%esi 2e: 89 d3 mov %edx,%ebx 30: 48 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%rbp 37: fc ff df 3a: 41 8a 04 2f mov (%r15,%rbp,1),%al 3e: 84 c0 test %al,%al