TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. ------------[ cut here ]------------ kernel BUG at mm/slab.c:2899! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8199 Comm: syz-executor.3 Not tainted 5.2.0-rc1+ #25 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:alloc_block mm/slab.c:2899 [inline] RIP: 0010:cache_alloc_refill mm/slab.c:2958 [inline] RIP: 0010:____cache_alloc mm/slab.c:3061 [inline] RIP: 0010:____cache_alloc mm/slab.c:3044 [inline] RIP: 0010:__do_cache_alloc mm/slab.c:3283 [inline] RIP: 0010:slab_alloc mm/slab.c:3318 [inline] RIP: 0010:kmem_cache_alloc+0x5f8/0x6f0 mm/slab.c:3488 Code: 45 c8 4c 89 62 08 48 89 53 08 48 89 4b 10 4c 89 60 48 41 f6 45 23 40 0f 84 3d ff ff ff 48 c7 43 20 00 00 00 00 e9 30 ff ff ff <0f> 0b 0f 0b c7 46 0c 01 00 00 00 e9 42 ff ff ff 0f 1f 44 00 00 8b RSP: 0018:ffff8880ae909388 EFLAGS: 00010092 RAX: 000000000000000a RBX: ffffea00022769c0 RCX: ffff88809b71be38 RDX: ffff88809b71be38 RSI: 0000000000000000 RDI: ffff88809b71be00 RBP: ffff8880ae9093f0 R08: 1ffff11015d2125e R09: 0000000000000010 R10: ffffed1015d2125e R11: 0000000000000003 R12: ffff888216980e00 R13: ffff888216980e00 R14: 0000000000000010 R15: ffffe8ffffd33440 FS: 00007fbb6b5ed700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002031e000 CR3: 00000000913fa000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: reqsk_alloc include/net/request_sock.h:88 [inline] inet_reqsk_alloc+0x52/0x490 net/ipv4/tcp_input.c:6382 tcp_conn_request+0x6b2/0x35a0 net/ipv4/tcp_input.c:6480 tcp_v6_conn_request net/ipv6/tcp_ipv6.c:1056 [inline] tcp_v6_conn_request+0x106/0x2b0 net/ipv6/tcp_ipv6.c:1048 tcp_rcv_state_process+0xa9f/0x4deb net/ipv4/tcp_input.c:6083 tcp_v6_do_rcv+0x7d7/0x12c0 net/ipv6/tcp_ipv6.c:1363 tcp_v6_rcv+0x3097/0x3570 net/ipv6/tcp_ipv6.c:1558 ip6_protocol_deliver_rcu+0x2fe/0x16c0 net/ipv6/ip6_input.c:401 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:442 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:451 dst_input include/net/dst.h:439 [inline] ip6_rcv_finish+0x1de/0x310 net/ipv6/ip6_input.c:80 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:276 __netif_receive_skb_one_core+0x113/0x1a0 net/core/dev.c:4990 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5104 process_backlog+0x206/0x750 net/core/dev.c:5944 napi_poll net/core/dev.c:6367 [inline] net_rx_action+0x4f5/0x1070 net/core/dev.c:6433 __do_softirq+0x25c/0x94c kernel/softirq.c:293 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1040 do_softirq.part.0+0x11a/0x170 kernel/softirq.c:338 do_softirq kernel/softirq.c:330 [inline] __local_bh_enable_ip+0x211/0x270 kernel/softirq.c:190 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:684 [inline] ip6_finish_output2+0x10a0/0x2550 net/ipv6/ip6_output.c:121 ip6_finish_output+0x56d/0xc20 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x235/0x7f0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:433 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip6_xmit+0xe35/0x20b0 net/ipv6/ip6_output.c:275 inet6_csk_xmit+0x2fb/0x5d0 net/ipv6/inet6_connection_sock.c:139 __tcp_transmit_skb+0x1a1a/0x3730 net/ipv4/tcp_output.c:1156 tcp_transmit_skb net/ipv4/tcp_output.c:1172 [inline] tcp_send_syn_data net/ipv4/tcp_output.c:3496 [inline] tcp_connect+0x1e32/0x4260 net/ipv4/tcp_output.c:3535 tcp_v6_connect+0x150b/0x20a0 net/ipv6/tcp_ipv6.c:332 __inet_stream_connect+0x834/0xe90 net/ipv4/af_inet.c:659 tcp_sendmsg_fastopen net/ipv4/tcp.c:1143 [inline] tcp_sendmsg_locked+0x2318/0x3920 net/ipv4/tcp.c:1185 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1419 inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:802 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:671 __sys_sendto+0x262/0x380 net/socket.c:1964 __do_sys_sendto net/socket.c:1976 [inline] __se_sys_sendto net/socket.c:1972 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1972 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fbb6b5ecc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459279 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 000000002031e000 R09: 000000000000001c R10: 0000000020000004 R11: 0000000000000246 R12: 00007fbb6b5ed6d4 R13: 00000000004c6d9d R14: 00000000004dbc40 R15: 00000000ffffffff Modules linked in: ======================================================