======================================
| [   26.923993][  T232] 1 lock held by bench-lookups_i/232:
| [ 26.924141][ T232] #0: ffff8880056caa58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
| [   26.924424][  T232]
| [   26.924424][  T232] stack backtrace:
[   26.924883][  T232] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   26.925218][  T232] Call Trace:
[   26.925339][  T232]  <TASK>
[ 26.925418][ T232] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.925573][ T232] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 26.925728][ T232] tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2232 (discriminator 7)) 
[ 26.925877][ T232] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 26.926032][ T232] ? __pfx_tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2106) 
[ 26.926216][ T232] ? stack_depot_save_flags (lib/stackdepot.c:664) 
[ 26.926372][ T232] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 26.926533][ T232] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 26.926678][ T232] ? kasan_save_free_info (mm/kasan/generic.c:582) 
[ 26.926831][ T232] ? __kasan_slab_free (mm/kasan/common.c:271) 
[ 26.926980][ T232] ? kfree (mm/slub.c:4579 mm/slub.c:4727) 
[ 26.927094][ T232] ? tcp_ao_parse_crypto (./include/net/tcp_ao.h:67 net/ipv4/tcp_ao.c:1436) 
[ 26.927270][ T232] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.927426][ T232] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 26.927572][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.927725][ T232] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.927872][ T232] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 26.928019][ T232] ? 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) 
[ 26.928166][ T232] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.928289][ T232] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 26.928434][ T232] do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 26.928582][ T232] ? __pfx_do_tcp_getsockopt (net/ipv4/tcp.c:4300) 
[ 26.928729][ T232] ? tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1737) 
[ 26.928890][ T232] ? release_sock (net/core/sock.c:3630) 
[ 26.929039][ T232] ? reacquire_held_locks (kernel/locking/lockdep.c:5350) 
[ 26.929184][ T232] ? release_sock (net/core/sock.c:3630) 
[ 26.929334][ T232] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 26.929480][ T232] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 26.929628][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.929776][ T232] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.929922][ T232] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 26.930071][ T232] ? 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) 
[ 26.930220][ T232] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.930338][ T232] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.930504][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.930655][ T232] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.930799][ T232] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 26.930950][ T232] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 26.931097][ T232] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 26.931242][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.931394][ T232] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 26.931541][ T232] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 26.931699][ T232] tcp_getsockopt (net/ipv4/tcp.c:4673 net/ipv4/tcp.c:4664) 
[ 26.931852][ T232] do_sock_getsockopt (net/socket.c:2396) 
[ 26.931998][ T232] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 26.932146][ T232] ? __pfx_do_sock_getsockopt (net/socket.c:2374) 
[ 26.932299][ T232] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 26.932414][ T232] __sys_getsockopt (./include/linux/file.h:35 net/socket.c:2428) 
[ 26.932565][ T232] ? __pfx___sys_getsockopt (net/socket.c:2415) 
[ 26.932718][ T232] ? __pfx_task_work_run (kernel/task_work.c:207) 
[ 26.932879][ T232] __x64_sys_getsockopt (net/socket.c:2432) 
[ 26.933031][ T232] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.933215][ T232] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.933362][ T232] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.933545][  T232] RIP: 0033:0x7f244f5b246e
[ 26.933697][ T232] 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
[   26.934210][  T232] RSP: 002b:00007ffec52bc8a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
[   26.934431][  T232] RAX: ffffffffffffffda RBX: 00007ffec52bcb60 RCX: 00007f244f5b246e
[   26.934651][  T232] RDX: 0000000000000029 RSI: 0000000000000006 RDI: 0000000000000009
[   26.934869][  T232] RBP: 00007ffec52bc8c0 R08: 00007ffec52bc8bc R09: 0000000000000064
[   26.935087][  T232] R10: 00007ffec52bc8c0 R11: 0000000000000246 R12: 0000000000000009
[   26.935335][  T232] R13: 0000000000000064 R14: 0000000000000020 R15: 0000000000000064
| [   26.937097][  T232] 1 lock held by bench-lookups_i/232:
| [ 26.937243][ T232] #0: ffff8880056caa58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   26.937516][  T232]
| [   26.937516][  T232] stack backtrace:
[   26.937957][  T232] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   26.938272][  T232] Call Trace:
[   26.938386][  T232]  <TASK>
[ 26.938473][ T232] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.938622][ T232] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 26.938776][ T232] __tcp_ao_do_lookup.part.0 (net/ipv4/tcp_ao.c:208) 
[ 26.938927][ T232] tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1698) 
[ 26.939077][ T232] ? __pfx_tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1597) 
[ 26.939226][ T232] ? 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) 
[ 26.939377][ T232] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.939559][ T232] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 26.939710][ T232] ? do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 26.939857][ T232] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 26.940011][ T232] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 26.940154][ T232] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.940306][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.940456][ T232] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.940598][ T232] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 26.940744][ T232] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 26.940887][ T232] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 26.941033][ T232] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 26.941186][ T232] do_sock_setsockopt (net/socket.c:2334) 
[ 26.941331][ T232] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 26.941484][ T232] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 26.941603][ T232] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 26.941761][ T232] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 26.941907][ T232] ? __pfx_task_work_run (kernel/task_work.c:207) 
[ 26.942061][ T232] __x64_sys_setsockopt (net/socket.c:2363) 
[ 26.942205][ T232] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.942391][ T232] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.942537][ T232] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.942716][  T232] RIP: 0033:0x7f244f5b291e
[ 26.942869][ T232] 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
[   26.943387][  T232] RSP: 002b:00007ffec52bca38 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   26.943635][  T232] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f244f5b291e
[   26.943853][  T232] RDX: 0000000000000026 RSI: 0000000000000006 RDI: 0000000000000009
[   26.944074][  T232] RBP: 0000000000000009 R08: 0000000000000120 R09: 0029383231736561
[   26.944294][  T232] R10: 00007ffec52bca40 R11: 0000000000000246 R12: 00007ffec52bcb60
[   26.944511][  T232] R13: ffffffff00000000 R14: 0000000000000001 R15: 0000000000000200
| [   27.166404][  T240] 1 lock held by bench-lookups_i/240:
| [ 27.166558][ T240] #0: ffff8880056c9d18 (sk_lock-AF_INET){+.+.}-{0:0}, at: inet_stream_connect (net/ipv4/af_inet.c:748) 
| [   27.166842][  T240]
| [   27.166842][  T240] stack backtrace:
[   27.167293][  T240] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   27.167628][  T240] Call Trace:
[   27.167745][  T240]  <TASK>
[ 27.167834][ T240] dump_stack_lvl (lib/dump_stack.c:123) 
[ 27.167991][ T240] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 27.168147][ T240] tcp_ao_finish_connect (net/ipv4/tcp_ao.c:1183 (discriminator 7)) 
[ 27.168301][ T240] tcp_finish_connect (net/ipv4/tcp_input.c:6340) 
[ 27.168465][ T240] tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6576) 
[ 27.168656][ T240] ? 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) 
[ 27.168813][ T240] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 27.168935][ T240] ? __pfx_tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6455) 
[ 27.169129][ T240] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 27.169318][ T240] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 27.169474][ T240] ? 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)) 
[ 27.169592][ T240] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 27.169748][ T240] tcp_rcv_state_process (net/ipv4/tcp_input.c:6796) 
[ 27.169898][ T240] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 27.170051][ T240] ? __release_sock (./include/net/sock.h:1121 net/core/sock.c:3077) 
[ 27.170205][ T240] ? __pfx_tcp_rcv_state_process (net/ipv4/tcp_input.c:6751) 
[ 27.170399][ T240] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 27.170521][ T240] tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1945) 
[ 27.170676][ T240] __release_sock (./include/net/sock.h:1121 net/core/sock.c:3077) 
[ 27.170834][ T240] release_sock (net/core/sock.c:3633) 
[ 27.170984][ T240] inet_stream_connect (net/ipv4/af_inet.c:751) 
[ 27.171154][ T240] __sys_connect (net/socket.c:2071 net/socket.c:2088) 
[ 27.171310][ T240] ? __pfx___sys_connect (net/socket.c:2078) 
[ 27.171459][ T240] ? do_fcntl (fs/fcntl.c:473) 
[ 27.171574][ T240] ? __pfx_do_fcntl (fs/fcntl.c:443) 
[ 27.171732][ T240] ? __fget_files (fs/file.c:1009) 
[ 27.171893][ T240] __x64_sys_connect (net/socket.c:2095) 
[ 27.172048][ T240] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 27.172201][ T240] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   27.172389][  T240] RIP: 0033:0x7f244f5b240b
[ 27.172547][ T240] 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
[   27.173075][  T240] RSP: 002b:00007f244ec5ecf0 EFLAGS: 00000293 ORIG_RAX: 000000000000002a
[   27.173304][  T240] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00007f244f5b240b
[   27.173539][  T240] RDX: 0000000000000010 RSI: 00007f244ec5ed40 RDI: 000000000000000a
[   27.173765][  T240] RBP: 000000000000000a R08: 0000000000000000 R09: 00007f244f74d080
[   27.173999][  T240] R10: 00007f244f46a598 R11: 0000000000000293 R12: 000000000040dab0
[   27.174233][  T240] R13: 0000000000000005 R14: 00007f244ec5ed40 R15: 00000000004143f8
| [   28.845788][  T232] 1 lock held by bench-lookups_i/232:
| [ 28.845933][ T232] #0: ffff8880056caa58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   28.846219][  T232]
| [   28.846219][  T232] stack backtrace:
[   28.846672][  T232] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   28.847037][  T232] Call Trace:
[   28.847157][  T232]  <TASK>
[ 28.847240][ T232] dump_stack_lvl (lib/dump_stack.c:123) 
[ 28.847399][ T232] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 28.847554][ T232] tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1905 (discriminator 7)) 
[ 28.847708][ T232] ? __pfx_tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1813) 
[ 28.847863][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.848023][ T232] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 28.848182][ T232] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 28.848335][ T232] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 28.848479][ T232] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 28.848637][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.848791][ T232] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 28.848945][ T232] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 28.849095][ T232] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 28.849239][ T232] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 28.849388][ T232] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 28.849545][ T232] do_sock_setsockopt (net/socket.c:2334) 
[ 28.849699][ T232] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 28.849854][ T232] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 28.849970][ T232] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 28.850120][ T232] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 28.850264][ T232] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) 
[ 28.850445][ T232] ? trace_rcu_segcb_stats (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/cpumask.h:570 ./include/linux/cpumask.h:1117 ./include/trace/events/rcu.h:537) 
[ 28.850597][ T232] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) 
[ 28.850777][ T232] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.850971][ T232] __x64_sys_setsockopt (net/socket.c:2363) 
[ 28.851114][ T232] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.851295][ T232] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 28.851440][ T232] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   28.851620][  T232] RIP: 0033:0x7f244f5b291e
[ 28.851772][ T232] 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
[   28.852286][  T232] RSP: 002b:00007ffec52bcb58 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
[   28.852506][  T232] RAX: ffffffffffffffda RBX: 0000000000414380 RCX: 00007f244f5b291e
[   28.852725][  T232] RDX: 0000000000000027 RSI: 0000000000000006 RDI: 0000000000000009
[   28.852954][  T232] RBP: 0000000000402dc0 R08: 0000000000000090 R09: 00007f244f74d080
[   28.853171][  T232] R10: 00007ffec52bcbd0 R11: 0000000000000206 R12: 0000000000000009


Finger prints:
lockdep_rcu_suspicious:tcp_ao_del_cmd:do_tcp_setsockopt:do_sock_setsockopt:__sys_setsockopt
lockdep_rcu_suspicious:tcp_ao_add_cmd:do_tcp_setsockopt:do_sock_setsockopt:__sys_setsockopt
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