======================================
| [ 2879.933853][T19980] 1 lock held by iptables/19980:
| [2879.934018][T19980] #0: ffff88801a83bec8 (&nft_net->commit_mutex){+.+.}-{3:3}, at: nf_tables_valid_genid (./include/linux/jiffies.h:101 net/netfilter/nf_tables_api.c:10954) nf_tables
| [ 2879.934441][T19980]
| [ 2879.934441][T19980] stack backtrace:
[ 2879.934941][T19980] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 2879.935333][T19980] Call Trace:
[ 2879.935462][T19980]  <TASK>
[2879.935550][T19980] dump_stack_lvl (lib/dump_stack.c:123) 
[2879.935722][T19980] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[2879.935887][T19980] __nft_rule_lookup (net/netfilter/nf_tables_api.c:3420 (discriminator 7)) nf_tables
[2879.936115][T19980] nf_tables_delrule (net/netfilter/nf_tables_api.c:4300) nf_tables
[2879.936345][T19980] ? __lock_release (kernel/locking/lockdep.c:5501) 
[2879.936510][T19980] ? net_generic (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/netns/generic.h:48) 
[2879.936674][T19980] ? __pfx_nf_tables_delrule (net/netfilter/nf_tables_api.c:4262) nf_tables
[2879.936897][T19980] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[2879.937064][T19980] ? __nla_validate_parse (lib/nlattr.c:638) 
[2879.937233][T19980] nfnetlink_rcv_batch (net/netfilter/nfnetlink.c:524) 
[2879.937407][T19980] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[2879.937572][T19980] ? __pfx_nfnetlink_rcv_batch (net/netfilter/nfnetlink.c:373) 
[2879.937738][T19980] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[2879.937906][T19980] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[2879.938067][T19980] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[2879.938248][T19980] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[2879.938417][T19980] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[2879.938579][T19980] ? __pfx_validate_nla (lib/nlattr.c:396) 
[2879.938747][T19980] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[2879.938916][T19980] ? __nla_validate_parse (lib/nlattr.c:638) 
[2879.939083][T19980] nfnetlink_rcv (net/netfilter/nfnetlink.c:647 net/netfilter/nfnetlink.c:665) 
[2879.939245][T19980] ? __pfx_nfnetlink_rcv (net/netfilter/nfnetlink.c:651) 
[2879.939408][T19980] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[2879.939584][T19980] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[2879.939750][T19980] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[2879.939912][T19980] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[2879.940076][T19980] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[2879.940247][T19980] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[2879.940405][T19980] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[2879.940570][T19980] ? __import_iovec (lib/iov_iter.c:1433 lib/iov_iter.c:1449) 
[2879.940740][T19980] ____sys_sendmsg (net/socket.c:729 net/socket.c:744 net/socket.c:2607) 
[2879.940904][T19980] ? __pfx_____sys_sendmsg (net/socket.c:2553) 
[2879.941063][T19980] ? __pfx_copy_msghdr_from_user (net/socket.c:2533) 
[2879.941270][T19980] ? sk_setsockopt (net/core/sock.c:1129 net/core/sock.c:1621) 
[2879.941433][T19980] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97 kernel/softirq.c:387) 
[2879.941605][T19980] ___sys_sendmsg (net/socket.c:2663) 
[2879.941771][T19980] ? __pfx____sys_sendmsg (net/socket.c:2650) 
[2879.941935][T19980] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[2879.942095][T19980] ? usage_skip (kernel/locking/lockdep.c:2314) 
[2879.942255][T19980] ? trace_kfree (./include/trace/events/kmem.h:94 (discriminator 52)) 
[2879.942421][T19980] ? kfree (mm/slub.c:4716) 
[2879.942554][T19980] ? do_sock_setsockopt (net/socket.c:2303) 
[2879.942718][T19980] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[2879.942891][T19980] ? fdget (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1114 fs/file.c:1128) 
[2879.943022][T19980] __sys_sendmsg (./include/linux/file.h:35 net/socket.c:2692) 
[2879.943189][T19980] ? __pfx___sys_sendmsg (net/socket.c:2678) 
[2879.943350][T19980] ? __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[2879.943539][T19980] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[2879.943719][T19980] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[2879.943886][T19980] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 2879.944086][T19980] RIP: 0033:0x7fa7b23877b7
[ 2879.944255][T19980] Code: 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0a 00                	or     (%rax),%al
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[ 2879.944818][T19980] RSP: 002b:00007ffde337a968 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 2879.945067][T19980] RAX: ffffffffffffffda RBX: 00007ffde337a970 RCX: 00007fa7b23877b7
[ 2879.945313][T19980] RDX: 0000000000000000 RSI: 00007ffde337ba00 RDI: 0000000000000005
[ 2879.945560][T19980] RBP: 00007ffde337c000 R08: 0000000000000004 R09: 0000000000000000
[ 2879.945799][T19980] R10: 00007ffde337b9ec R11: 0000000000000246 R12: 0000000000004000


Finger prints:
lockdep_rcu_suspicious:__nft_rule_lookup:nf_tables_delrule:nfnetlink_rcv_batch:nfnetlink_rcv