======================================
| [   33.815588][  T234] 1 lock held by bench-lookups_i/234:
| [ 33.815878][ T234] #0: ffff888006072a58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
| [   33.816779][  T234]
| [   33.816779][  T234] stack backtrace:
[   33.817533][  T234] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   33.818113][  T234] Call Trace:
[   33.818323][  T234]  <TASK>
[ 33.818469][ T234] dump_stack_lvl (lib/dump_stack.c:123) 
[ 33.818749][ T234] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 33.819036][ T234] tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2232 (discriminator 7)) 
[ 33.819288][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 33.819627][ T234] ? __pfx_tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2106) 
[ 33.819956][ T234] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 33.820219][ T234] ? __pte_offset_map_lock (./include/linux/pgtable.h:324 ./include/linux/pgtable.h:594 mm/pgtable-generic.c:376) 
[ 33.820522][ T234] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 33.820795][ T234] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 33.821064][ T234] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 33.821404][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 33.821729][ T234] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 33.822019][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 33.822300][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 33.822583][ T234] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 33.822863][ 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) 
[ 33.823127][ T234] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 33.823352][ T234] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 33.823617][ T234] do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 33.823901][ T234] ? __pfx_do_tcp_getsockopt (net/ipv4/tcp.c:4300) 
[ 33.824160][ T234] ? tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1737) 
[ 33.824471][ T234] ? release_sock (net/core/sock.c:3630) 
[ 33.824751][ T234] ? reacquire_held_locks (kernel/locking/lockdep.c:5350) 
[ 33.825012][ T234] ? release_sock (net/core/sock.c:3630) 
[ 33.825277][ T234] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 33.825574][ T234] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 33.825847][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 33.826125][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 33.826396][ T234] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 33.826665][ 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) 
[ 33.826922][ T234] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 33.827131][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 33.827445][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 33.827706][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 33.827978][ T234] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 33.828271][ T234] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 33.828538][ T234] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 33.828784][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 33.829057][ T234] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 33.829320][ T234] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 33.829593][ T234] tcp_getsockopt (net/ipv4/tcp.c:4673 net/ipv4/tcp.c:4664) 
[ 33.829864][ T234] do_sock_getsockopt (net/socket.c:2396) 
[ 33.830136][ T234] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 33.830411][ T234] ? __pfx_do_sock_getsockopt (net/socket.c:2374) 
[ 33.830718][ T234] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 33.830931][ T234] __sys_getsockopt (./include/linux/file.h:35 net/socket.c:2428) 
[ 33.831197][ T234] ? __pfx___sys_getsockopt (net/socket.c:2415) 
[ 33.831456][ T234] ? __pfx_task_work_run (kernel/task_work.c:207) 
[ 33.831733][ T234] __x64_sys_getsockopt (net/socket.c:2432) 
[ 33.831989][ T234] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 33.832326][ T234] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 33.832615][ T234] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   33.832946][  T234] RIP: 0033:0x7efe9777546e
[ 33.833232][ 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
[   33.834190][  T234] RSP: 002b:00007fff64592ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
[   33.834585][  T234] RAX: ffffffffffffffda RBX: 00007fff64592fa0 RCX: 00007efe9777546e
[   33.835009][  T234] RDX: 0000000000000029 RSI: 0000000000000006 RDI: 0000000000000009
[   33.835473][  T234] RBP: 00007fff64592d00 R08: 00007fff64592cfc R09: 0000000000000064
[   33.835858][  T234] R10: 00007fff64592d00 R11: 0000000000000246 R12: 0000000000000009
[   33.836224][  T234] R13: 0000000000000064 R14: 0000000000000020 R15: 0000000000000064
| [   33.839359][  T234] 1 lock held by bench-lookups_i/234:
| [ 33.839626][ T234] #0: ffff888006072a58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   33.840103][  T234]
| [   33.840103][  T234] stack backtrace:
[   33.840925][  T234] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   33.841493][  T234] Call Trace:
[   33.841692][  T234]  <TASK>
[ 33.841837][ T234] dump_stack_lvl (lib/dump_stack.c:123) 
[ 33.842093][ T234] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 33.842347][ T234] __tcp_ao_do_lookup.part.0 (net/ipv4/tcp_ao.c:208) 
[ 33.842603][ T234] tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1698) 
[ 33.842893][ T234] ? __pfx_tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1597) 
[ 33.843162][ 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) 
[ 33.843436][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 33.843748][ T234] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 33.844020][ T234] ? do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 33.844274][ T234] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 33.844533][ T234] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 33.844779][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 33.845060][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 33.845319][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 33.845583][ T234] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 33.845838][ T234] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 33.846096][ T234] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 33.846348][ T234] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 33.846609][ T234] do_sock_setsockopt (net/socket.c:2334) 
[ 33.846860][ T234] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 33.847159][ T234] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 33.847355][ T234] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 33.847631][ T234] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 33.847894][ T234] ? __pfx_task_work_run (kernel/task_work.c:207) 
[ 33.848204][ T234] __x64_sys_setsockopt (net/socket.c:2363) 
[ 33.848466][ T234] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 33.848802][ T234] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 33.849072][ T234] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   33.849401][  T234] RIP: 0033:0x7efe9777591e
[ 33.849674][ T234] 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
[   33.850587][  T234] RSP: 002b:00007fff64592e78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   33.850992][  T234] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efe9777591e
[   33.851396][  T234] RDX: 0000000000000026 RSI: 0000000000000006 RDI: 0000000000000009
[   33.851817][  T234] RBP: 0000000000000009 R08: 0000000000000120 R09: 0029383231736561
[   33.852229][  T234] R10: 00007fff64592e80 R11: 0000000000000246 R12: 00007fff64592fa0
[   33.852651][  T234] R13: ffffffff00000000 R14: 0000000000000001 R15: 0000000000000200
| [   34.124335][  T241] 1 lock held by bench-lookups_i/241:
| [ 34.124661][ T241] #0: ffff888006071d18 (sk_lock-AF_INET){+.+.}-{0:0}, at: inet_stream_connect (net/ipv4/af_inet.c:748) 
| [   34.125193][  T241]
| [   34.125193][  T241] stack backtrace:
[   34.125879][  T241] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   34.126301][  T241] Call Trace:
[   34.126460][  T241]  <TASK>
[ 34.126626][ T241] dump_stack_lvl (lib/dump_stack.c:123) 
[ 34.126833][ T241] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 34.127053][ T241] tcp_ao_finish_connect (net/ipv4/tcp_ao.c:1183 (discriminator 7)) 
[ 34.127247][ T241] tcp_finish_connect (net/ipv4/tcp_input.c:6340) 
[ 34.127445][ T241] tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6576) 
[ 34.127698][ T241] ? 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) 
[ 34.127892][ T241] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 34.128048][ T241] ? __pfx_tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6455) 
[ 34.128272][ T241] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 34.128488][ T241] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 34.128687][ T241] ? 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)) 
[ 34.128829][ T241] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 34.129055][ T241] tcp_rcv_state_process (net/ipv4/tcp_input.c:6796) 
[ 34.129234][ T241] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 34.129441][ T241] ? __release_sock (./include/net/sock.h:1121 net/core/sock.c:3077) 
[ 34.129650][ T241] ? __pfx_tcp_rcv_state_process (net/ipv4/tcp_input.c:6751) 
[ 34.129916][ T241] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 34.130063][ T241] tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1945) 
[ 34.130246][ T241] __release_sock (./include/net/sock.h:1121 net/core/sock.c:3077) 
[ 34.130438][ T241] release_sock (net/core/sock.c:3633) 
[ 34.130616][ T241] inet_stream_connect (net/ipv4/af_inet.c:751) 
[ 34.130823][ T241] __sys_connect (net/socket.c:2071 net/socket.c:2088) 
[ 34.131008][ T241] ? __pfx___sys_connect (net/socket.c:2078) 
[ 34.131171][ T241] ? do_fcntl (fs/fcntl.c:473) 
[ 34.131301][ T241] ? __pfx_do_fcntl (fs/fcntl.c:443) 
[ 34.131495][ T241] ? __fget_files (fs/file.c:1009) 
[ 34.131674][ T241] __x64_sys_connect (net/socket.c:2095) 
[ 34.131862][ T241] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 34.132057][ T241] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   34.132267][  T241] RIP: 0033:0x7efe9777540b
[ 34.132449][ T241] 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
[   34.133067][  T241] RSP: 002b:00007efe96e21cf0 EFLAGS: 00000293 ORIG_RAX: 000000000000002a
[   34.133337][  T241] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00007efe9777540b
[   34.133637][  T241] RDX: 0000000000000010 RSI: 00007efe96e21d40 RDI: 000000000000000a
[   34.133915][  T241] RBP: 000000000000000a R08: 0000000000000000 R09: 00007efe97910080
[   34.134167][  T241] R10: 00007efe9762d598 R11: 0000000000000293 R12: 000000000040dab0
[   34.134432][  T241] R13: 0000000000000005 R14: 00007efe96e21d40 R15: 00000000004143f8
| [   36.152009][  T234] 1 lock held by bench-lookups_i/234:
| [ 36.152291][ T234] #0: ffff888006072a58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   36.152752][  T234]
| [   36.152752][  T234] stack backtrace:
[   36.153330][  T234] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   36.153759][  T234] Call Trace:
[   36.153906][  T234]  <TASK>
[ 36.153998][ T234] dump_stack_lvl (lib/dump_stack.c:123) 
[ 36.154195][ T234] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 36.154373][ T234] tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1905 (discriminator 7)) 
[ 36.154554][ T234] ? __pfx_tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1813) 
[ 36.154746][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 36.154981][ T234] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 36.155172][ T234] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 36.155371][ T234] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 36.155688][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 36.155885][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 36.156093][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 36.156274][ T234] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 36.156445][ T234] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 36.156608][ T234] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 36.156769][ T234] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 36.156977][ T234] do_sock_setsockopt (net/socket.c:2334) 
[ 36.157162][ T234] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 36.157362][ T234] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 36.157508][ T234] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 36.157681][ T234] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 36.157873][ T234] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) 
[ 36.158117][ T234] ? 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) 
[ 36.158289][ T234] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) 
[ 36.158518][ T234] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 36.158727][ T234] __x64_sys_setsockopt (net/socket.c:2363) 
[ 36.158912][ T234] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 36.159169][ T234] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 36.159350][ T234] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   36.159622][  T234] RIP: 0033:0x7efe9777591e
[ 36.159806][ T234] 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
[   36.160620][  T234] RSP: 002b:00007fff64592f98 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
[   36.161045][  T234] RAX: ffffffffffffffda RBX: 0000000000414380 RCX: 00007efe9777591e
[   36.161440][  T234] RDX: 0000000000000027 RSI: 0000000000000006 RDI: 0000000000000009
[   36.161841][  T234] RBP: 0000000000402dc0 R08: 0000000000000090 R09: 00007efe97910080
[   36.162222][  T234] R10: 00007fff64593010 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