======================================
| [   26.677703][  T235] 1 lock held by bench-lookups_i/235:
| [ 26.677850][ T235] #0: ffff888007661098 (sk_lock-AF_INET6){+.+.}-{0:0}, at: do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
| [   26.678159][  T235]
| [   26.678159][  T235] stack backtrace:
[   26.678591][  T235] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   26.678907][  T235] Call Trace:
[   26.679023][  T235]  <TASK>
[ 26.679100][ T235] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.679250][ T235] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 26.679399][ T235] tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2232 (discriminator 7)) 
[ 26.679549][ T235] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 26.679703][ T235] ? __pfx_tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2106) 
[ 26.679881][ T235] ? stack_depot_save_flags (lib/stackdepot.c:664) 
[ 26.680029][ T235] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 26.680177][ T235] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 26.680321][ T235] ? kfree (mm/slub.c:4579 mm/slub.c:4727) 
[ 26.680430][ T235] ? tcp_ao_parse_crypto (./include/net/tcp_ao.h:67 net/ipv4/tcp_ao.c:1436) 
[ 26.680604][ T235] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.680763][ T235] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 26.680912][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.681064][ T235] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.681206][ T235] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 26.681354][ 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) 
[ 26.681500][ T235] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.681622][ T235] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 26.681782][ T235] do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 26.681949][ T235] ? __pfx_do_tcp_getsockopt (net/ipv4/tcp.c:4300) 
[ 26.682094][ T235] ? tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1737) 
[ 26.682257][ T235] ? release_sock (net/core/sock.c:3630) 
[ 26.682401][ T235] ? reacquire_held_locks (kernel/locking/lockdep.c:5350) 
[ 26.682546][ T235] ? release_sock (net/core/sock.c:3630) 
[ 26.682697][ T235] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 26.682842][ T235] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 26.682989][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.683138][ T235] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.683282][ T235] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 26.683429][ 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) 
[ 26.683573][ T235] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.683694][ T235] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.683852][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.684009][ T235] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.684152][ T235] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 26.684300][ T235] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 26.684446][ T235] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 26.684592][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.684748][ T235] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 26.684892][ T235] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 26.685038][ T235] tcp_getsockopt (net/ipv4/tcp.c:4673 net/ipv4/tcp.c:4664) 
[ 26.685187][ T235] do_sock_getsockopt (net/socket.c:2396) 
[ 26.685333][ T235] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 26.685492][ T235] ? __pfx_do_sock_getsockopt (net/socket.c:2374) 
[ 26.685646][ T235] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 26.685761][ T235] __sys_getsockopt (./include/linux/file.h:35 net/socket.c:2428) 
[ 26.685910][ T235] ? __pfx___sys_getsockopt (net/socket.c:2415) 
[ 26.686060][ T235] ? __pfx_task_work_run (kernel/task_work.c:207) 
[ 26.686214][ T235] __x64_sys_getsockopt (net/socket.c:2432) 
[ 26.686356][ T235] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.686538][ T235] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.686691][ T235] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.687053][  T235] RIP: 0033:0x7fa9260cc46e
[ 26.687206][ 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
[   26.687703][  T235] RSP: 002b:00007fff1b61db88 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
[   26.687925][  T235] RAX: ffffffffffffffda RBX: 00007fff1b61de40 RCX: 00007fa9260cc46e
[   26.688148][  T235] RDX: 0000000000000029 RSI: 0000000000000006 RDI: 0000000000000009
[   26.688362][  T235] RBP: 00007fff1b61dba0 R08: 00007fff1b61db9c R09: 0000000000000064
[   26.688589][  T235] R10: 00007fff1b61dba0 R11: 0000000000000246 R12: 0000000000000009
[   26.688804][  T235] R13: 0000000000000064 R14: 0000000000000080 R15: 0000000000000064
| [   26.690688][  T235] 1 lock held by bench-lookups_i/235:
| [ 26.690833][ T235] #0: ffff888007661098 (sk_lock-AF_INET6){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   26.691128][  T235]
| [   26.691128][  T235] stack backtrace:
[   26.691566][  T235] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   26.691890][  T235] Call Trace:
[   26.692002][  T235]  <TASK>
[ 26.692080][ T235] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.692229][ T235] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 26.692376][ T235] __tcp_ao_do_lookup.part.0 (net/ipv4/tcp_ao.c:208) 
[ 26.692524][ T235] tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1698) 
[ 26.692683][ T235] ? __pfx_tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1597) 
[ 26.692829][ 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) 
[ 26.693008][ T235] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 26.693159][ T235] ? do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 26.693302][ T235] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 26.693450][ T235] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 26.693592][ T235] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.693736][ T235] ? hlock_class (kernel/locking/lockdep.c:223) 
[ 26.693885][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.694036][ T235] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.694183][ T235] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 26.694328][ T235] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 26.694471][ T235] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 26.694618][ T235] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 26.694766][ T235] do_sock_setsockopt (net/socket.c:2334) 
[ 26.694909][ T235] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 26.695066][ T235] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 26.695179][ T235] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 26.695325][ T235] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 26.695471][ T235] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 26.695616][ T235] ? __pfx_task_work_run (kernel/task_work.c:207) 
[ 26.695767][ T235] __x64_sys_setsockopt (net/socket.c:2363) 
[ 26.695909][ T235] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.696087][ T235] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.696232][ T235] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.696411][  T235] RIP: 0033:0x7fa9260cc91e
[ 26.696562][ 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
[   26.697063][  T235] RSP: 002b:00007fff1b61dd18 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   26.697280][  T235] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa9260cc91e
[   26.697500][  T235] RDX: 0000000000000026 RSI: 0000000000000006 RDI: 0000000000000009
[   26.697716][  T235] RBP: 0000000000000009 R08: 0000000000000120 R09: 0029383231736561
[   26.697932][  T235] R10: 00007fff1b61dd20 R11: 0000000000000246 R12: 00007fff1b61de40
[   26.698148][  T235] R13: 0000000000414380 R14: 0000000000000200 R15: 000000003d4981a0
| [   26.918062][  T243] 1 lock held by bench-lookups_i/243:
| [ 26.918212][ T243] #0: ffff888007660298 (sk_lock-AF_INET6){+.+.}-{0:0}, at: inet_stream_connect (net/ipv4/af_inet.c:748) 
| [   26.918492][  T243]
| [   26.918492][  T243] stack backtrace:
[   26.918942][  T243] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   26.919303][  T243] Call Trace:
[   26.919420][  T243]  <TASK>
[ 26.919503][ T243] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.919662][ T243] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 26.919819][ T243] tcp_ao_finish_connect (net/ipv4/tcp_ao.c:1183 (discriminator 7)) 
[ 26.919971][ T243] tcp_finish_connect (net/ipv4/tcp_input.c:6340) 
[ 26.920125][ T243] tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6576) 
[ 26.920309][ T243] ? 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) 
[ 26.920461][ T243] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.920580][ T243] ? __pfx_tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6455) 
[ 26.920768][ T243] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.920957][ T243] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 26.921106][ T243] ? 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)) 
[ 26.921227][ T243] tcp_rcv_state_process (net/ipv4/tcp_input.c:6796) 
[ 26.921377][ T243] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.921524][ T243] ? __release_sock (./include/net/sock.h:1121 net/core/sock.c:3077) 
[ 26.921674][ T243] ? __pfx_tcp_rcv_state_process (net/ipv4/tcp_input.c:6751) 
[ 26.921868][ T243] ? 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) 
[ 26.922017][ T243] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.922139][ T243] tcp_v6_do_rcv (net/ipv6/tcp_ipv6.c:1676) 
[ 26.922288][ T243] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.922473][ T243] __release_sock (net/core/sock.c:3079) 
[ 26.922630][ T243] release_sock (net/core/sock.c:3633) 
[ 26.922779][ T243] inet_stream_connect (net/ipv4/af_inet.c:751) 
[ 26.922930][ T243] __sys_connect (net/socket.c:2071 net/socket.c:2088) 
[ 26.923108][ T243] ? __pfx___sys_connect (net/socket.c:2078) 
[ 26.923257][ T243] ? do_fcntl (fs/fcntl.c:473) 
[ 26.923375][ T243] ? __fget_files (fs/file.c:1009) 
[ 26.923540][ T243] __x64_sys_connect (net/socket.c:2095) 
[ 26.923689][ T243] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.923843][ T243] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.924026][  T243] RIP: 0033:0x7fa9260cc40b
[ 26.924185][ T243] 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
[   26.924705][  T243] RSP: 002b:00007fa925778cd0 EFLAGS: 00000293 ORIG_RAX: 000000000000002a
[   26.924930][  T243] RAX: ffffffffffffffda RBX: 000000000000001c RCX: 00007fa9260cc40b
[   26.925154][  T243] RDX: 000000000000001c RSI: 00007fa925778d20 RDI: 000000000000000a
[   26.925375][  T243] RBP: 000000000000000a R08: 0000000000000000 R09: 00007fa926267080
[   26.925598][  T243] R10: 00007fa925f84598 R11: 0000000000000293 R12: 000000000040dab0
[   26.925826][  T243] R13: 0000000000000005 R14: 00007fa925778d20 R15: 00000000004143f8
| [   28.683292][  T235] 1 lock held by bench-lookups_i/235:
| [ 28.683439][ T235] #0: ffff888007661098 (sk_lock-AF_INET6){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   28.683775][  T235]
| [   28.683775][  T235] stack backtrace:
[   28.684205][  T235] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   28.684519][  T235] Call Trace:
[   28.684632][  T235]  <TASK>
[ 28.684710][ T235] dump_stack_lvl (lib/dump_stack.c:123) 
[ 28.684861][ T235] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 28.685010][ T235] tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1905 (discriminator 7)) 
[ 28.685160][ T235] ? __pfx_tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1813) 
[ 28.685308][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.685467][ T235] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 28.685620][ T235] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 28.685766][ T235] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 28.685909][ T235] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 28.686061][ T235] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.686209][ T235] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 28.686352][ T235] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 28.686497][ T235] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 28.686638][ T235] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 28.686794][ T235] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 28.686942][ T235] do_sock_setsockopt (net/socket.c:2334) 
[ 28.687085][ T235] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 28.687238][ T235] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 28.687351][ T235] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 28.687498][ T235] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 28.687639][ T235] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) 
[ 28.687814][ 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) 
[ 28.687962][ T235] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) 
[ 28.688134][ T235] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.688315][ T235] __x64_sys_setsockopt (net/socket.c:2363) 
[ 28.688461][ T235] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.688644][ T235] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 28.688790][ T235] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   28.688966][  T235] RIP: 0033:0x7fa9260cc91e
[ 28.689116][ 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
[   28.689627][  T235] RSP: 002b:00007fff1b61de38 EFLAGS: 00000202 ORIG_RAX: 0000000000000036
[   28.689842][  T235] RAX: ffffffffffffffda RBX: 0000000000414380 RCX: 00007fa9260cc91e
[   28.690053][  T235] RDX: 0000000000000027 RSI: 0000000000000006 RDI: 0000000000000009
[   28.690265][  T235] RBP: 0000000000402dd0 R08: 0000000000000090 R09: 00007fa926267080
[   28.690477][  T235] R10: 00007fff1b61deb0 R11: 0000000000000202 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