======================================
| [   26.029206][  T234] 1 lock held by seq-ext_ipv6/234:
| [ 26.029372][ T234] #0: ffff888004f19e98 (sk_lock-AF_INET6){+.+.}-{0:0}, at: do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
| [   26.029710][  T234]
| [   26.029710][  T234] stack backtrace:
[   26.030189][  T234] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   26.030548][  T234] Call Trace:
[   26.030720][  T234]  <TASK>
[ 26.030809][ T234] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.030976][ T234] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 26.031138][ T234] tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2232 (discriminator 7)) 
[ 26.031312][ T234] ? __pfx_tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2106) 
[ 26.031759][ T234] ? stack_depot_save_flags (lib/stackdepot.c:618) 
[ 26.031925][ T234] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 26.032086][ T234] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 26.032245][ T234] ? kfree (mm/slub.c:4579 mm/slub.c:4727) 
[ 26.032367][ T234] ? tcp_ao_parse_crypto (./include/net/tcp_ao.h:67 net/ipv4/tcp_ao.c:1436) 
[ 26.032563][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.032735][ T234] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 26.032896][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.033063][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.033225][ T234] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 26.033389][ T234] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 26.033550][ T234] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.033682][ T234] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 26.033844][ T234] do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 26.034006][ T234] ? __pfx_do_tcp_getsockopt (net/ipv4/tcp.c:4300) 
[ 26.034165][ T234] ? tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1737) 
[ 26.034340][ T234] ? release_sock (net/core/sock.c:3630) 
[ 26.034500][ T234] ? reacquire_held_locks (kernel/locking/lockdep.c:5350) 
[ 26.034666][ T234] ? release_sock (net/core/sock.c:3630) 
[ 26.034829][ T234] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 26.034988][ T234] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 26.035149][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.035315][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.035473][ T234] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 26.035633][ T234] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 26.035794][ T234] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.035925][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.036097][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.036260][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.036419][ T234] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 26.036579][ T234] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 26.036745][ T234] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 26.036905][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.037070][ T234] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 26.037231][ T234] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 26.037407][ T234] tcp_getsockopt (net/ipv4/tcp.c:4673 net/ipv4/tcp.c:4664) 
[ 26.037572][ T234] do_sock_getsockopt (net/socket.c:2396) 
[ 26.037734][ T234] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 26.037895][ T234] ? __pfx_do_sock_getsockopt (net/socket.c:2374) 
[ 26.038066][ T234] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 26.038192][ T234] __sys_getsockopt (./include/linux/file.h:35 net/socket.c:2428) 
[ 26.038354][ T234] ? __sys_setsockopt (net/socket.c:2360) 
[ 26.038513][ T234] ? __pfx___sys_getsockopt (net/socket.c:2415) 
[ 26.038675][ T234] ? __pfx___sys_socket (net/socket.c:1712) 
[ 26.038850][ T234] __x64_sys_getsockopt (net/socket.c:2432) 
[ 26.039010][ T234] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.039208][ T234] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.039371][ T234] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.039572][  T234] RIP: 0033:0x7f4f1508346e
[ 26.039750][ T234] Code: 1f 44 00 00 48 8b 15 91 99 0a 00 f7 d8 64 89 02 b8 ff ff ff ff eb b8 0f 1f 44 00 00 f3 0f 1e fa 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 0a c3 66 0f 1f 84 00 00 00 00 00 48 8b 15 59
All code
========
   0:	1f                   	(bad)
   1:	44 00 00             	add    %r8b,(%rax)
   4:	48 8b 15 91 99 0a 00 	mov    0xa9991(%rip),%rdx        # 0xa999c
   b:	f7 d8                	neg    %eax
   d:	64 89 02             	mov    %eax,%fs:(%rdx)
  10:	b8 ff ff ff ff       	mov    $0xffffffff,%eax
  15:	eb b8                	jmp    0xffffffffffffffcf
  17:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  1c:	f3 0f 1e fa          	endbr64
  20:	49 89 ca             	mov    %rcx,%r10
  23:	b8 37 00 00 00       	mov    $0x37,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 0a                	ja     0x3c
  32:	c3                   	ret
  33:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  3a:	00 00 
  3c:	48                   	rex.W
  3d:	8b                   	.byte 0x8b
  3e:	15                   	.byte 0x15
  3f:	59                   	pop    %rcx

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 0a                	ja     0x12
   8:	c3                   	ret
   9:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  10:	00 00 
  12:	48                   	rex.W
  13:	8b                   	.byte 0x8b
  14:	15                   	.byte 0x15
  15:	59                   	pop    %rcx
[   26.040315][  T234] RSP: 002b:00007ffdaafc0dd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
[   26.040556][  T234] RAX: ffffffffffffffda RBX: 00007ffdaafc1130 RCX: 00007f4f1508346e
[   26.040797][  T234] RDX: 0000000000000029 RSI: 0000000000000006 RDI: 0000000000000009
[   26.041035][  T234] RBP: 00007ffdaafc0df0 R08: 00007ffdaafc0dec R09: 0000000000000064
[   26.041276][  T234] R10: 00007ffdaafc0df0 R11: 0000000000000246 R12: 0000000000000009
[   26.041516][  T234] R13: 0000000000000064 R14: 0000000000000080 R15: 0000000000000064
| [   26.045123][  T242] 1 lock held by seq-ext_ipv6/242:
| [ 26.045280][ T242] #0: ffff888004f19098 (sk_lock-AF_INET6){+.+.}-{0:0}, at: inet_stream_connect (net/ipv4/af_inet.c:748) 
| [   26.045557][  T242]
| [   26.045557][  T242] stack backtrace:
[   26.045988][  T242] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   26.046307][  T242] Call Trace:
[   26.046423][  T242]  <TASK>
[ 26.046505][ T242] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.046657][ T242] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 26.046806][ T242] __tcp_ao_do_lookup.part.0 (net/ipv4/tcp_ao.c:208) 
[ 26.046956][ T242] tcp_ao_do_lookup (net/ipv4/tcp_ao.c:200 net/ipv4/tcp_ao.c:222) 
[ 26.047103][ T242] tcp_connect (net/ipv4/tcp_output.c:4114) 
[ 26.047407][ T242] ? rt6_get_cookie (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/ip6_fib.h:312) 
[ 26.047570][ T242] tcp_v6_connect (net/ipv6/tcp_ipv6.c:333) 
[ 26.047725][ T242] ? __pfx_tcp_v6_connect (net/ipv6/tcp_ipv6.c:137) 
[ 26.047877][ T242] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 26.048030][ T242] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.048187][ T242] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 26.048337][ T242] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.048462][ T242] __inet_stream_connect (net/ipv4/af_inet.c:677) 
[ 26.048622][ T242] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.048807][ T242] inet_stream_connect (net/ipv4/af_inet.c:749) 
[ 26.048954][ T242] __sys_connect (net/socket.c:2071 net/socket.c:2088) 
[ 26.049102][ T242] ? __pfx___sys_connect (net/socket.c:2078) 
[ 26.049253][ T242] ? do_fcntl (fs/fcntl.c:473) 
[ 26.049370][ T242] ? __fget_files (fs/file.c:1009) 
[ 26.049522][ T242] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:316) 
[ 26.049710][ T242] __x64_sys_connect (net/socket.c:2095) 
[ 26.049861][ T242] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.050010][ T242] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.050191][  T242] RIP: 0033:0x7f4f1508340b
[ 26.050343][ T242] Code: 83 ec 18 89 54 24 0c 48 89 34 24 89 7c 24 08 e8 eb c7 f4 ff 8b 54 24 0c 48 8b 34 24 41 89 c0 8b 7c 24 08 b8 2a 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 08 e8 41 c8 f4 ff 8b 44
All code
========
   0:	83 ec 18             	sub    $0x18,%esp
   3:	89 54 24 0c          	mov    %edx,0xc(%rsp)
   7:	48 89 34 24          	mov    %rsi,(%rsp)
   b:	89 7c 24 08          	mov    %edi,0x8(%rsp)
   f:	e8 eb c7 f4 ff       	call   0xfffffffffff4c7ff
  14:	8b 54 24 0c          	mov    0xc(%rsp),%edx
  18:	48 8b 34 24          	mov    (%rsp),%rsi
  1c:	41 89 c0             	mov    %eax,%r8d
  1f:	8b 7c 24 08          	mov    0x8(%rsp),%edi
  23:	b8 2a 00 00 00       	mov    $0x2a,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 35                	ja     0x67
  32:	44 89 c7             	mov    %r8d,%edi
  35:	89 44 24 08          	mov    %eax,0x8(%rsp)
  39:	e8 41 c8 f4 ff       	call   0xfffffffffff4c87f
  3e:	8b                   	.byte 0x8b
  3f:	44                   	rex.R

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 35                	ja     0x3d
   8:	44 89 c7             	mov    %r8d,%edi
   b:	89 44 24 08          	mov    %eax,0x8(%rsp)
   f:	e8 41 c8 f4 ff       	call   0xfffffffffff4c855
  14:	8b                   	.byte 0x8b
  15:	44                   	rex.R
[   26.050852][  T242] RSP: 002b:00007f4f0fffeac0 EFLAGS: 00000293 ORIG_RAX: 000000000000002a
[   26.051076][  T242] RAX: ffffffffffffffda RBX: 000000000000001c RCX: 00007f4f1508340b
[   26.051295][  T242] RDX: 000000000000001c RSI: 00007f4f0fffecc0 RDI: 000000000000000b
[   26.051518][  T242] RBP: 000000000000000b R08: 0000000000000000 R09: 00000000ffffffff
[   26.051734][  T242] R10: 00007f4f14f3b598 R11: 0000000000000293 R12: 0000000000410210
[   26.051949][  T242] R13: 0000000000000005 R14: 00007f4f0fffecc0 R15: 000000000000000a
| [   26.058125][  T242] 1 lock held by seq-ext_ipv6/242:
| [ 26.058304][ T242] #0: ffff888004f19098 (sk_lock-AF_INET6){+.+.}-{0:0}, at: inet_stream_connect (net/ipv4/af_inet.c:748) 
| [   26.058610][  T242]
| [   26.058610][  T242] stack backtrace:
[   26.059098][  T242] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   26.059455][  T242] Call Trace:
[   26.059583][  T242]  <TASK>
[ 26.059672][ T242] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.059839][ T242] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 26.060006][ T242] tcp_ao_finish_connect (net/ipv4/tcp_ao.c:1183 (discriminator 7)) 
[ 26.060170][ T242] tcp_finish_connect (net/ipv4/tcp_input.c:6340) 
[ 26.060340][ T242] tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6576) 
[ 26.060540][ T242] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 26.060706][ T242] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.060840][ T242] ? __pfx_tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6455) 
[ 26.061042][ T242] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.061244][ T242] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 26.061406][ T242] ? ktime_get (kernel/time/timekeeping.c:195 (discriminator 4) kernel/time/timekeeping.c:395 (discriminator 4) kernel/time/timekeeping.c:403 (discriminator 4) kernel/time/timekeeping.c:850 (discriminator 4)) 
[ 26.061535][ T242] tcp_rcv_state_process (net/ipv4/tcp_input.c:6796) 
[ 26.061701][ T242] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.061869][ T242] ? __release_sock (./include/net/sock.h:1121 net/core/sock.c:3077) 
[ 26.062033][ T242] ? __pfx_tcp_rcv_state_process (net/ipv4/tcp_input.c:6751) 
[ 26.062232][ T242] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 26.062396][ T242] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.062525][ T242] tcp_v6_do_rcv (net/ipv6/tcp_ipv6.c:1676) 
[ 26.062692][ T242] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.062900][ T242] __release_sock (net/core/sock.c:3079) 
[ 26.063071][ T242] release_sock (net/core/sock.c:3633) 
[ 26.063235][ T242] inet_stream_connect (net/ipv4/af_inet.c:751) 
[ 26.063402][ T242] __sys_connect (net/socket.c:2071 net/socket.c:2088) 
[ 26.063567][ T242] ? __pfx___sys_connect (net/socket.c:2078) 
[ 26.063728][ T242] ? do_fcntl (fs/fcntl.c:473) 
[ 26.063860][ T242] ? __fget_files (fs/file.c:1009) 
[ 26.064028][ T242] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:316) 
[ 26.064239][ T242] __x64_sys_connect (net/socket.c:2095) 
[ 26.064402][ T242] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.064573][ T242] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.064775][  T242] RIP: 0033:0x7f4f1508340b
[ 26.064945][ T242] Code: 83 ec 18 89 54 24 0c 48 89 34 24 89 7c 24 08 e8 eb c7 f4 ff 8b 54 24 0c 48 8b 34 24 41 89 c0 8b 7c 24 08 b8 2a 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 08 e8 41 c8 f4 ff 8b 44
All code
========
   0:	83 ec 18             	sub    $0x18,%esp
   3:	89 54 24 0c          	mov    %edx,0xc(%rsp)
   7:	48 89 34 24          	mov    %rsi,(%rsp)
   b:	89 7c 24 08          	mov    %edi,0x8(%rsp)
   f:	e8 eb c7 f4 ff       	call   0xfffffffffff4c7ff
  14:	8b 54 24 0c          	mov    0xc(%rsp),%edx
  18:	48 8b 34 24          	mov    (%rsp),%rsi
  1c:	41 89 c0             	mov    %eax,%r8d
  1f:	8b 7c 24 08          	mov    0x8(%rsp),%edi
  23:	b8 2a 00 00 00       	mov    $0x2a,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 35                	ja     0x67
  32:	44 89 c7             	mov    %r8d,%edi
  35:	89 44 24 08          	mov    %eax,0x8(%rsp)
  39:	e8 41 c8 f4 ff       	call   0xfffffffffff4c87f
  3e:	8b                   	.byte 0x8b
  3f:	44                   	rex.R

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 35                	ja     0x3d
   8:	44 89 c7             	mov    %r8d,%edi
   b:	89 44 24 08          	mov    %eax,0x8(%rsp)
   f:	e8 41 c8 f4 ff       	call   0xfffffffffff4c855
  14:	8b                   	.byte 0x8b
  15:	44                   	rex.R
[   26.065514][  T242] RSP: 002b:00007f4f0fffeac0 EFLAGS: 00000293 ORIG_RAX: 000000000000002a
[   26.065765][  T242] RAX: ffffffffffffffda RBX: 000000000000001c RCX: 00007f4f1508340b
[   26.066009][  T242] RDX: 000000000000001c RSI: 00007f4f0fffecc0 RDI: 000000000000000b
[   26.066255][  T242] RBP: 000000000000000b R08: 0000000000000000 R09: 00000000ffffffff
[   26.066497][  T242] R10: 00007f4f14f3b598 R11: 0000000000000293 R12: 0000000000410210
[   26.066738][  T242] R13: 0000000000000005 R14: 00007f4f0fffecc0 R15: 000000000000000a
| [   27.353549][  T242] 1 lock held by seq-ext_ipv6/242:
| [ 27.353704][ T242] #0: ffff888004f18298 (sk_lock-AF_INET6){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   27.354026][  T242]
| [   27.354026][  T242] stack backtrace:
[   27.354478][  T242] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   27.354814][  T242] Call Trace:
[   27.354929][  T242]  <TASK>
[ 27.355008][ T242] dump_stack_lvl (lib/dump_stack.c:123) 
[ 27.355165][ T242] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 27.355317][ T242] tcp_ao_set_repair (net/ipv4/tcp_ao.c:2399 (discriminator 7)) 
[ 27.355465][ T242] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 27.355617][ T242] ? __pfx_tcp_ao_set_repair (net/ipv4/tcp_ao.c:2371) 
[ 27.355775][ T242] do_tcp_setsockopt (net/ipv4/tcp.c:3924) 
[ 27.355923][ T242] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 27.356069][ T242] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 27.356224][ T242] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 27.356373][ T242] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 27.356517][ T242] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 27.356663][ T242] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 27.356810][ T242] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 27.356959][ T242] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 27.357111][ T242] do_sock_setsockopt (net/socket.c:2334) 
[ 27.357269][ T242] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 27.357429][ T242] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 27.357545][ T242] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 27.357694][ T242] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 27.357837][ T242] ? __fget_files (fs/file.c:1009) 
[ 27.357982][ T242] ? __pfx___sys_socket (net/socket.c:1712) 
[ 27.358139][ T242] __x64_sys_setsockopt (net/socket.c:2363) 
[ 27.358284][ T242] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 27.358463][ T242] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 27.358613][ T242] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   27.358796][  T242] RIP: 0033:0x7f4f1508391e
[ 27.358951][ T242] Code: 0f 1f 40 00 48 8b 15 e1 94 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b1 0f 1f 00 f3 0f 1e fa 49 89 ca b8 36 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 0a c3 66 0f 1f 84 00 00 00 00 00 48 8b 15 a9
All code
========
   0:	0f 1f 40 00          	nopl   0x0(%rax)
   4:	48 8b 15 e1 94 0a 00 	mov    0xa94e1(%rip),%rdx        # 0xa94ec
   b:	f7 d8                	neg    %eax
   d:	64 89 02             	mov    %eax,%fs:(%rdx)
  10:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
  17:	eb b1                	jmp    0xffffffffffffffca
  19:	0f 1f 00             	nopl   (%rax)
  1c:	f3 0f 1e fa          	endbr64
  20:	49 89 ca             	mov    %rcx,%r10
  23:	b8 36 00 00 00       	mov    $0x36,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 0a                	ja     0x3c
  32:	c3                   	ret
  33:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  3a:	00 00 
  3c:	48                   	rex.W
  3d:	8b                   	.byte 0x8b
  3e:	15                   	.byte 0x15
  3f:	a9                   	.byte 0xa9

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 0a                	ja     0x12
   8:	c3                   	ret
   9:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  10:	00 00 
  12:	48                   	rex.W
  13:	8b                   	.byte 0x8b
  14:	15                   	.byte 0x15
  15:	a9                   	.byte 0xa9
[   27.359457][  T242] RSP: 002b:00007f4f0fffea78 EFLAGS: 00000202 ORIG_RAX: 0000000000000036
[   27.359675][  T242] RAX: ffffffffffffffda RBX: 000000000000631b RCX: 00007f4f1508391e
[   27.359890][  T242] RDX: 000000000000002a RSI: 0000000000000006 RDI: 000000000000000a
[   27.360105][  T242] RBP: 00005402b80d0120 R08: 0000000000000010 R09: 0000000000000064
[   27.360326][  T242] R10: 00007f4f0fffeb10 R11: 0000000000000202 R12: 0100000000000000


Finger prints:
lockdep_rcu_suspicious:tcp_ao_do_lookup:tcp_connect:tcp_v6_connect:__inet_stream_connect
lockdep_rcu_suspicious:tcp_ao_finish_connect:tcp_finish_connect:tcp_rcv_synsent_state_process:tcp_rcv_state_process
lockdep_rcu_suspicious:tcp_ao_copy_mkts_to_user:do_tcp_getsockopt:tcp_getsockopt:do_sock_getsockopt
lockdep_rcu_suspicious:tcp_ao_set_repair:do_tcp_setsockopt:do_sock_setsockopt:__sys_setsockopt