======================================
| [   42.600443][  T235] 1 lock held by bench-lookups_i/235:
| [ 42.600734][ T235] #0: ffff888005bd9098 (sk_lock-AF_INET6){+.+.}-{0:0}, at: do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
| [   42.601327][  T235]
| [   42.601327][  T235] stack backtrace:
[   42.602077][  T235] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   42.602605][  T235] Call Trace:
[   42.602796][  T235]  <TASK>
[ 42.602930][ T235] dump_stack_lvl (lib/dump_stack.c:123) 
[ 42.603178][ T235] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 42.603426][ T235] tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2232 (discriminator 7)) 
[ 42.603657][ T235] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 42.603917][ T235] ? __pfx_tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2106) 
[ 42.604221][ T235] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 42.604463][ T235] ? __pte_offset_map_lock (./include/linux/pgtable.h:324 ./include/linux/pgtable.h:594 mm/pgtable-generic.c:376) 
[ 42.604707][ T235] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 42.604947][ T235] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 42.605220][ T235] ? 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) 
[ 42.605524][ T235] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 42.605796][ T235] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 42.606049][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 42.606300][ T235] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 42.606545][ T235] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 42.606809][ T235] ? 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) 
[ 42.607058][ T235] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 42.607273][ T235] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 42.607508][ T235] do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 42.607672][ T235] ? __pfx_do_tcp_getsockopt (net/ipv4/tcp.c:4300) 
[ 42.607864][ T235] ? tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1737) 
[ 42.608067][ T235] ? release_sock (net/core/sock.c:3630) 
[ 42.608244][ T235] ? reacquire_held_locks (kernel/locking/lockdep.c:5350) 
[ 42.608443][ T235] ? release_sock (net/core/sock.c:3630) 
[ 42.608675][ T235] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 42.608936][ T235] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 42.609192][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 42.609450][ T235] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 42.609700][ T235] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 42.609905][ T235] ? 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) 
[ 42.610088][ T235] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 42.610279][ T235] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 42.610531][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 42.610792][ T235] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 42.611040][ T235] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 42.611267][ T235] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 42.611431][ T235] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 42.611611][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 42.611825][ T235] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 42.612070][ T235] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 42.612326][ T235] tcp_getsockopt (net/ipv4/tcp.c:4673 net/ipv4/tcp.c:4664) 
[ 42.612591][ T235] do_sock_getsockopt (net/socket.c:2396) 
[ 42.612840][ T235] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 42.613111][ T235] ? __pfx_do_sock_getsockopt (net/socket.c:2374) 
[ 42.613380][ T235] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 42.613579][ T235] __sys_getsockopt (./include/linux/file.h:35 net/socket.c:2428) 
[ 42.613839][ T235] ? __pfx___sys_getsockopt (net/socket.c:2415) 
[ 42.614105][ T235] ? __pfx_task_work_run (kernel/task_work.c:207) 
[ 42.614381][ T235] __x64_sys_getsockopt (net/socket.c:2432) 
[ 42.614628][ T235] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 42.614942][ T235] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 42.615485][ T235] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   42.615798][  T235] RIP: 0033:0x7f65768f846e
[ 42.616064][ T235] 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
[   42.616939][  T235] RSP: 002b:00007ffd99d62838 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
[   42.617364][  T235] RAX: ffffffffffffffda RBX: 00007ffd99d62af0 RCX: 00007f65768f846e
[   42.617745][  T235] RDX: 0000000000000029 RSI: 0000000000000006 RDI: 0000000000000009
[   42.618121][  T235] RBP: 00007ffd99d62850 R08: 00007ffd99d6284c R09: 0000000000000064
[   42.618496][  T235] R10: 00007ffd99d62850 R11: 0000000000000246 R12: 0000000000000009
[   42.618872][  T235] R13: 0000000000000064 R14: 0000000000000080 R15: 0000000000000064
| [   42.621539][  T235] 1 lock held by bench-lookups_i/235:
| [ 42.621712][ T235] #0: ffff888005bd9098 (sk_lock-AF_INET6){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   42.622170][  T235]
| [   42.622170][  T235] stack backtrace:
[   42.622639][  T235] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   42.623126][  T235] Call Trace:
[   42.623317][  T235]  <TASK>
[ 42.623470][ T235] dump_stack_lvl (lib/dump_stack.c:123) 
[ 42.623726][ T235] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 42.623980][ T235] __tcp_ao_do_lookup.part.0 (net/ipv4/tcp_ao.c:208) 
[ 42.624243][ T235] tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1698) 
[ 42.624421][ T235] ? __pfx_tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1597) 
[ 42.624610][ T235] ? 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) 
[ 42.624860][ T235] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 42.625108][ T235] ? do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 42.625339][ T235] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 42.625567][ T235] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 42.625759][ T235] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 42.625929][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 42.626197][ T235] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 42.626430][ T235] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 42.626682][ T235] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 42.626925][ T235] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 42.627174][ T235] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 42.627425][ T235] do_sock_setsockopt (net/socket.c:2334) 
[ 42.627674][ T235] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 42.627938][ T235] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 42.628144][ T235] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 42.628416][ T235] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 42.628688][ T235] ? __pfx_task_work_run (kernel/task_work.c:207) 
[ 42.628946][ T235] __x64_sys_setsockopt (net/socket.c:2363) 
[ 42.629189][ T235] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 42.629493][ T235] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 42.629746][ T235] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   42.630048][  T235] RIP: 0033:0x7f65768f891e
[ 42.630314][ T235] 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
[   42.631194][  T235] RSP: 002b:00007ffd99d629c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   42.631553][  T235] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f65768f891e
[   42.631903][  T235] RDX: 0000000000000026 RSI: 0000000000000006 RDI: 0000000000000009
[   42.632288][  T235] RBP: 0000000000000009 R08: 0000000000000120 R09: 0029383231736561
[   42.632654][  T235] R10: 00007ffd99d629d0 R11: 0000000000000246 R12: 00007ffd99d62af0
[   42.633036][  T235] R13: 0000000000414380 R14: 0000000000000200 R15: 000000001d4501a0
| [   42.888343][  T242] 1 lock held by bench-lookups_i/242:
| [ 42.888597][ T242] #0: ffff888005bd9e98 (sk_lock-AF_INET6){+.+.}-{0:0}, at: inet_stream_connect (net/ipv4/af_inet.c:748) 
| [   42.889080][  T242]
| [   42.889080][  T242] stack backtrace:
[   42.889835][  T242] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   42.890388][  T242] Call Trace:
[   42.890585][  T242]  <TASK>
[ 42.890721][ T242] dump_stack_lvl (lib/dump_stack.c:123) 
[ 42.890979][ T242] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 42.891235][ T242] tcp_ao_finish_connect (net/ipv4/tcp_ao.c:1183 (discriminator 7)) 
[ 42.891495][ T242] tcp_finish_connect (net/ipv4/tcp_input.c:6340) 
[ 42.891755][ T242] tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6576) 
[ 42.892061][ 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) 
[ 42.892322][ T242] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 42.892523][ T242] ? __pfx_tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6455) 
[ 42.892861][ T242] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 42.893134][ T242] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 42.893364][ 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)) 
[ 42.893553][ T242] tcp_rcv_state_process (net/ipv4/tcp_input.c:6796) 
[ 42.893777][ T242] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 42.894007][ T242] ? __release_sock (./include/net/sock.h:1121 net/core/sock.c:3077) 
[ 42.894239][ T242] ? __pfx_tcp_rcv_state_process (net/ipv4/tcp_input.c:6751) 
[ 42.894514][ 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) 
[ 42.894751][ T242] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 42.894942][ T242] tcp_v6_do_rcv (net/ipv6/tcp_ipv6.c:1676) 
[ 42.895170][ T242] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 42.895454][ T242] __release_sock (net/core/sock.c:3079) 
[ 42.895697][ T242] release_sock (net/core/sock.c:3633) 
[ 42.895926][ T242] inet_stream_connect (net/ipv4/af_inet.c:751) 
[ 42.896163][ T242] __sys_connect (net/socket.c:2071 net/socket.c:2088) 
[ 42.896399][ T242] ? __pfx___sys_connect (net/socket.c:2078) 
[ 42.896631][ T242] ? do_fcntl (fs/fcntl.c:473) 
[ 42.896824][ T242] ? __fget_files (fs/file.c:1009) 
[ 42.897074][ T242] __x64_sys_connect (net/socket.c:2095) 
[ 42.897312][ T242] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 42.897559][ T242] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   42.897852][  T242] RIP: 0033:0x7f65768f840b
[ 42.898099][ 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
[   42.898909][  T242] RSP: 002b:00007f6575fa4cd0 EFLAGS: 00000293 ORIG_RAX: 000000000000002a
[   42.899264][  T242] RAX: ffffffffffffffda RBX: 000000000000001c RCX: 00007f65768f840b
[   42.899609][  T242] RDX: 000000000000001c RSI: 00007f6575fa4d20 RDI: 000000000000000a
[   42.899954][  T242] RBP: 000000000000000a R08: 0000000000000000 R09: 00007f6576a93080
[   42.900298][  T242] R10: 00007f65767b0598 R11: 0000000000000293 R12: 000000000040dab0
[   42.900637][  T242] R13: 0000000000000005 R14: 00007f6575fa4d20 R15: 00000000004143f8
| [   44.976001][  T235] 1 lock held by bench-lookups_i/235:
| [ 44.976163][ T235] #0: ffff888005bd9098 (sk_lock-AF_INET6){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   44.976492][  T235]
| [   44.976492][  T235] stack backtrace:
[   44.976947][  T235] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   44.977298][  T235] Call Trace:
[   44.977432][  T235]  <TASK>
[ 44.977523][ T235] dump_stack_lvl (lib/dump_stack.c:123) 
[ 44.977679][ T235] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 44.977837][ T235] tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1905 (discriminator 7)) 
[ 44.978001][ T235] ? __pfx_tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1813) 
[ 44.978156][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 44.978325][ T235] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 44.978489][ T235] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 44.978651][ T235] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 44.978805][ T235] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 44.979004][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 44.979153][ T235] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 44.979304][ T235] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 44.979451][ T235] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 44.979604][ T235] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 44.979750][ T235] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 44.979914][ T235] do_sock_setsockopt (net/socket.c:2334) 
[ 44.980075][ T235] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 44.980233][ T235] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 44.980359][ T235] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 44.980522][ T235] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 44.980668][ T235] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) 
[ 44.980846][ T235] ? 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) 
[ 44.980995][ T235] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) 
[ 44.981177][ T235] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 44.981362][ T235] __x64_sys_setsockopt (net/socket.c:2363) 
[ 44.981511][ T235] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 44.981689][ T235] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 44.981838][ T235] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   44.982022][  T235] RIP: 0033:0x7f65768f891e
[ 44.982180][ T235] 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
[   44.982686][  T235] RSP: 002b:00007ffd99d62ae8 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
[   44.982907][  T235] RAX: ffffffffffffffda RBX: 0000000000414380 RCX: 00007f65768f891e
[   44.983124][  T235] RDX: 0000000000000027 RSI: 0000000000000006 RDI: 0000000000000009
[   44.983344][  T235] RBP: 0000000000402dd0 R08: 0000000000000090 R09: 00007f6576a93080
[   44.983572][  T235] R10: 00007ffd99d62b60 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