======================================
| [  655.266501][    C3] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies.
| [  690.969961][ T4620] ------------[ cut here ]------------
| [ 690.970560][ T4620] WARNING: CPU: 3 PID: 4620 at net/netfilter/nf_tables_api.c:4780 nf_tables_fill_set_info (net/netfilter/nf_tables_api.c:4780 (discriminator 1)) nf_tables 
| [  690.971296][ T4620] Modules linked in: sctp_diag nft_limit nfnetlink_queue nft_queue sctp ip6_udp_tunnel udp_tunnel nft_numgen esp4 sha1_generic xfrm_user 8021q bridge stp llc nft_flow_offload nf_flow_table_inet nf_flow_table nf_conntrack_netlink nft_redir nft_nat tcp_diag inet_diag nft_masq nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth
[  690.973830][ T4620] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 690.974220][ T4620] RIP: 0010:nf_tables_fill_set_info (net/netfilter/nf_tables_api.c:4780 (discriminator 1)) nf_tables 
[ 690.974745][ T4620] Code: 00 00 00 48 8b 94 24 98 00 00 00 65 48 2b 15 67 64 92 ea 75 55 48 81 c4 a0 00 00 00 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc 90 <0f> 0b 90 e9 e0 fe ff ff 4c 89 e7 e8 58 ff f1 e5 e9 31 ff ff ff b8
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	00 48 8b             	add    %cl,-0x75(%rax)
   5:	94                   	xchg   %eax,%esp
   6:	24 98                	and    $0x98,%al
   8:	00 00                	add    %al,(%rax)
   a:	00 65 48             	add    %ah,0x48(%rbp)
   d:	2b 15 67 64 92 ea    	sub    -0x156d9b99(%rip),%edx        # 0xffffffffea92647a
  13:	75 55                	jne    0x6a
  15:	48 81 c4 a0 00 00 00 	add    $0xa0,%rsp
  1c:	5b                   	pop    %rbx
  1d:	5d                   	pop    %rbp
  1e:	41 5c                	pop    %r12
  20:	41 5d                	pop    %r13
  22:	41 5e                	pop    %r14
  24:	c3                   	ret
  25:	cc                   	int3
  26:	cc                   	int3
  27:	cc                   	int3
  28:	cc                   	int3
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	e9 e0 fe ff ff       	jmp    0xffffffffffffff12
  32:	4c 89 e7             	mov    %r12,%rdi
  35:	e8 58 ff f1 e5       	call   0xffffffffe5f1ff92
  3a:	e9 31 ff ff ff       	jmp    0xffffffffffffff70
  3f:	b8                   	.byte 0xb8

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	e9 e0 fe ff ff       	jmp    0xfffffffffffffee8
   8:	4c 89 e7             	mov    %r12,%rdi
   b:	e8 58 ff f1 e5       	call   0xffffffffe5f1ff68
  10:	e9 31 ff ff ff       	jmp    0xffffffffffffff46
  15:	b8                   	.byte 0xb8
[  690.976007][ T4620] RSP: 0018:ffffc90000a56fd8 EFLAGS: 00010216
[  690.976401][ T4620] RAX: 0000000000000022 RBX: 1ffff9200014adfb RCX: 0000000000000000
[  690.977157][ T4620] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 1ffff9200014adcf
[  690.977626][ T4620] RBP: ffff888012c12000 R08: ffffffffc027c543 R09: dffffc0000000000
[  690.978097][ T4620] R10: ffffffffc0278fdb R11: 0000000000000004 R12: ffffc90000a57018
[  690.978559][ T4620] R13: ffff88800ba45380 R14: ffff888012c120c0 R15: 0000000000000000
[  690.979028][ T4620] FS:  00007fbf3d693340(0000) GS:ffff88808b463000(0000) knlGS:0000000000000000
[  690.979572][ T4620] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  690.979969][ T4620] CR2: 0000000032dc4e18 CR3: 00000000121ec003 CR4: 0000000000772ef0
[  690.980436][ T4620] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  690.980905][ T4620] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  690.981373][ T4620] PKRU: 55555554
[  690.981609][ T4620] Call Trace:
[  690.981850][ T4620]  <TASK>
[ 690.982013][ T4620] ? __pfx_nf_tables_fill_set_info (net/netfilter/nf_tables_api.c:4770) nf_tables 
[ 690.982427][ T4620] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 690.982761][ T4620] ? nla_put (lib/nlattr.c:1100) 
[ 690.983001][ T4620] nf_tables_fill_set (net/netfilter/nf_tables_api.c:4869) nf_tables 
[ 690.983424][ T4620] ? __pfx_nf_tables_fill_set (net/netfilter/nf_tables_api.c:4791) nf_tables 
[ 690.983848][ T4620] ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 ./include/net/netns/generic.h:48) nf_tables 
[ 690.984193][ T4620] nf_tables_dump_sets (net/netfilter/nf_tables_api.c:4973) nf_tables 
[ 690.984631][ T4620] ? __build_skb_around (./arch/x86/include/asm/atomic.h:28 ./include/linux/atomic/atomic-arch-fallback.h:503 ./include/linux/atomic/atomic-instrumented.h:68 net/core/skbuff.c:380 net/core/skbuff.c:438) 
[ 690.984951][ T4620] ? __pfx_nf_tables_dump_sets (net/netfilter/nf_tables_api.c:4933) nf_tables 
[ 690.985359][ T4620] ? __alloc_skb (net/core/skbuff.c:684) 
[ 690.985679][ T4620] netlink_dump (net/netlink/af_netlink.c:2309) 
[ 690.986005][ T4620] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 690.986318][ T4620] ? __pfx_netlink_dump (net/netlink/af_netlink.c:2243) 
[ 690.986625][ T4620] ? mark_held_locks (kernel/locking/lockdep.c:4326) 
[ 690.986953][ T4620] ? netlink_lookup (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:522) 
[ 690.987262][ T4620] ? nf_tables_dump_sets_start (net/netfilter/nf_tables_api.c:4998) nf_tables 
[ 690.987679][ T4620] __netlink_dump_start (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/sock.h:1942 net/netlink/af_netlink.c:2426) 
[ 690.987999][ T4620] nft_netlink_dump_start_rcu (./include/linux/netlink.h:340 net/netfilter/nf_tables_api.c:1255) nf_tables 
[ 690.988414][ T4620] nf_tables_getset (net/netfilter/nf_tables_api.c:5045) nf_tables 
[ 690.988837][ T4620] ? __pfx_nf_tables_getset (net/netfilter/nf_tables_api.c:5014) nf_tables 
[ 690.989248][ T4620] ? __pfx_nf_tables_dump_sets_start (net/netfilter/nf_tables_api.c:4994) nf_tables 
[ 690.989743][ T4620] ? __pfx_nf_tables_dump_sets (net/netfilter/nf_tables_api.c:4933) nf_tables 
[ 690.990156][ T4620] ? __pfx_nf_tables_dump_sets_done (net/netfilter/nf_tables_api.c:5006) nf_tables 
[ 690.990573][ T4620] ? __nla_validate_parse (./include/net/netlink.h:1287 (discriminator 1) lib/nlattr.c:622 (discriminator 1)) 
[ 690.990902][ T4620] nfnetlink_rcv_msg (net/netfilter/nfnetlink.c:290) 
[ 690.991224][ T4620] ? __pfx_nfnetlink_rcv_msg (net/netfilter/nfnetlink.c:218) 
[ 690.991550][ T4620] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 690.991867][ T4620] ? __kernel_text_address (kernel/extable.c:79) 
[ 690.992175][ T4620] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 690.992481][ T4620] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 690.992878][ T4620] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 690.993200][ T4620] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 690.993509][ T4620] ? __pfx_nfnetlink_rcv_msg (net/netfilter/nfnetlink.c:218) 
[ 690.993826][ T4620] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 690.994145][ T4620] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 690.994465][ T4620] ? cap_capable (security/commoncap.c:132) 
[ 690.994788][ T4620] nfnetlink_rcv (net/netfilter/nfnetlink.c:651) 
[ 690.995101][ T4620] ? __pfx_nfnetlink_rcv (net/netfilter/nfnetlink.c:651) 
[ 690.995411][ T4620] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 690.995717][ T4620] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[ 690.996035][ T4620] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 690.996347][ T4620] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 690.996655][ T4620] ? __lock_acquire (kernel/locking/lockdep.c:5235) 
[ 690.996978][ T4620] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 690.997292][ T4620] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 690.997603][ T4620] ? __might_fault (mm/memory.c:7151 mm/memory.c:7145) 
[ 690.997919][ T4620] ? _copy_from_user (./arch/x86/include/asm/smap.h:29 ./arch/x86/include/asm/uaccess_64.h:134 ./arch/x86/include/asm/uaccess_64.h:141 ./include/linux/uaccess.h:178 lib/usercopy.c:18) 
[ 690.998238][ T4620] __sys_sendto (net/socket.c:712 net/socket.c:727 net/socket.c:2180) 
[ 690.998548][ T4620] ? __pfx___sys_sendto (net/socket.c:2147) 
[ 690.998879][ T4620] ? __pfx_lock_vma_under_rcu (mm/memory.c:6547) 
[ 690.999195][ T4620] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 690.999502][ T4620] ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:151 arch/x86/mm/fault.c:1488 arch/x86/mm/fault.c:1538) 
[ 690.999823][ T4620] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 691.000134][ T4620] ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:151 arch/x86/mm/fault.c:1488 arch/x86/mm/fault.c:1538) 
[ 691.000442][ T4620] ? do_user_addr_fault (./arch/x86/include/asm/atomic.h:93 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/mm.h:704 ./include/linux/mm.h:799 arch/x86/mm/fault.c:1339) 
[ 691.000764][ T4620] __x64_sys_sendto (net/socket.c:2183) 
[ 691.001071][ T4620] ? do_syscall_64 (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 ./include/linux/entry-common.h:198 arch/x86/entry/syscall_64.c:90) 
[ 691.001379][ T4620] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 691.001686][ T4620] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 691.002003][ T4620] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  691.002389][ T4620] RIP: 0033:0x7fbf3d92fa4a
[ 691.002710][ T4620] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89
All code
========
   0:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   4:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   b:	eb b8                	jmp    0xffffffffffffffc5
   d:	0f 1f 00             	nopl   (%rax)
  10:	f3 0f 1e fa          	endbr64
  14:	41 89 ca             	mov    %ecx,%r10d
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 15                	jne    0x38
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 7e                	ja     0xb0
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	41 54                	push   %r12
  3a:	48 83 ec 30          	sub    $0x30,%rsp
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 7e                	ja     0x86
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	41 54                	push   %r12
  10:	48 83 ec 30          	sub    $0x30,%rsp
  14:	44                   	rex.R
  15:	89                   	.byte 0x89
[  691.003817][ T4620] RSP: 002b:00007ffdfe6ce298 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[  691.004289][ T4620] RAX: ffffffffffffffda RBX: 00007ffdfe6cf3d0 RCX: 00007fbf3d92fa4a
[  691.004766][ T4620] RDX: 0000000000000014 RSI: 00007ffdfe6ce300 RDI: 0000000000000005
[  691.005227][ T4620] RBP: 00007ffdfe6ce2f0 R08: 00007fbf3dafa200 R09: 000000000000000c
[  691.005688][ T4620] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014


Finger prints:
nf_tables_fill_set_info:nf_tables_fill_set:nf_tables_dump_sets:netlink_dump:__netlink_dump_start