======================================
| [   27.547671][  T234] 1 lock held by icmps-accept_ip/234:
| [ 27.547837][ T234] #0: ffff888002f7b798 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   27.548277][  T234]
| [   27.548277][  T234] stack backtrace:
[   27.549687][  T234] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   27.550047][  T234] Call Trace:
[   27.550175][  T234]  <TASK>
[ 27.550271][ T234] dump_stack_lvl (lib/dump_stack.c:123) 
[ 27.550436][ T234] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 27.550596][ T234] __tcp_ao_do_lookup.part.0 (net/ipv4/tcp_ao.c:208) 
[ 27.550766][ T234] tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1698) 
[ 27.550932][ T234] ? __pfx_tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1597) 
[ 27.551097][ 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) 
[ 27.551269][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 27.551458][ T234] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 27.551632][ T234] ? do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 27.551791][ T234] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 27.551957][ T234] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 27.552120][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 27.552291][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 27.552464][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 27.552622][ T234] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 27.552784][ T234] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 27.552949][ T234] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 27.553119][ T234] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 27.553278][ T234] do_sock_setsockopt (net/socket.c:2334) 
[ 27.553441][ T234] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 27.553612][ T234] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 27.553749][ T234] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 27.553913][ T234] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 27.554076][ T234] ? __rseq_handle_notify_resume (kernel/rseq.c:316) 
[ 27.554272][ T234] ? do_user_addr_fault (./include/linux/mmap_lock.h:172 arch/x86/mm/fault.c:1417) 
[ 27.554439][ T234] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:316) 
[ 27.554648][ T234] __x64_sys_setsockopt (net/socket.c:2363) 
[ 27.554812][ T234] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 27.555017][ T234] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 27.555192][ T234] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   27.555399][  T234] RIP: 0033:0x7f5a6180a91e
[ 27.555569][ 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
[   27.556125][  T234] RSP: 002b:00007ffe9b79a458 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   27.556374][  T234] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5a6180a91e
[   27.556623][  T234] RDX: 0000000000000026 RSI: 0000000000000006 RDI: 0000000000000009
[   27.556869][  T234] RBP: 0000000000000009 R08: 0000000000000120 R09: 0029383231736561
[   27.557132][  T234] R10: 00007ffe9b79a460 R11: 0000000000000246 R12: 00007ffe9b79a580
[   27.557371][  T234] R13: 0000000000000020 R14: 0000000000400000 R15: 0000000401fe000a
| [   27.763969][  T242] 1 lock held by icmps-accept_ip/242:
| [ 27.764217][ T242] #0: ffff888002f7aa58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
| [   27.764576][  T242]
| [   27.764576][  T242] stack backtrace:
[   27.765059][  T242] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   27.765411][  T242] Call Trace:
[   27.765536][  T242]  <TASK>
[ 27.765621][ T242] dump_stack_lvl (lib/dump_stack.c:123) 
[ 27.765792][ T242] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 27.765959][ T242] tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2232 (discriminator 7)) 
[ 27.766124][ T242] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 27.766316][ T242] ? __pfx_tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2106) 
[ 27.766516][ T242] ? stack_depot_save_flags (lib/stackdepot.c:664) 
[ 27.766682][ T242] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 27.766846][ T242] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 27.767004][ T242] ? kasan_save_free_info (mm/kasan/generic.c:582) 
[ 27.767171][ T242] ? __kasan_slab_free (mm/kasan/common.c:271) 
[ 27.767332][ T242] ? kfree (mm/slub.c:4579 mm/slub.c:4727) 
[ 27.767456][ T242] ? tcp_ao_parse_crypto (./include/net/tcp_ao.h:67 net/ipv4/tcp_ao.c:1436) 
[ 27.767647][ T242] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 27.767819][ T242] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 27.767995][ T242] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 27.768163][ T242] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 27.768327][ T242] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 27.768493][ 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) 
[ 27.768657][ T242] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 27.768791][ T242] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 27.768951][ T242] do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 27.769115][ T242] ? __pfx_do_tcp_getsockopt (net/ipv4/tcp.c:4300) 
[ 27.769281][ T242] ? tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1737) 
[ 27.769463][ T242] ? release_sock (net/core/sock.c:3630) 
[ 27.769627][ T242] ? reacquire_held_locks (kernel/locking/lockdep.c:5350) 
[ 27.769797][ T242] ? release_sock (net/core/sock.c:3630) 
[ 27.769962][ T242] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 27.770130][ T242] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 27.770296][ T242] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 27.770468][ T242] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 27.770631][ T242] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 27.770798][ 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) 
[ 27.770962][ T242] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 27.771097][ T242] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 27.771274][ T242] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 27.771442][ T242] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 27.771604][ T242] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 27.771777][ T242] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 27.771938][ T242] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 27.772103][ T242] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 27.772276][ T242] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 27.772438][ T242] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 27.772609][ T242] tcp_getsockopt (net/ipv4/tcp.c:4673 net/ipv4/tcp.c:4664) 
[ 27.772780][ T242] do_sock_getsockopt (net/socket.c:2396) 
[ 27.772951][ T242] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 27.773117][ T242] ? __pfx_do_sock_getsockopt (net/socket.c:2374) 
[ 27.773291][ T242] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 27.773427][ T242] __sys_getsockopt (./include/linux/file.h:35 net/socket.c:2428) 
[ 27.773596][ T242] ? __pfx___sys_getsockopt (net/socket.c:2415) 
[ 27.773767][ T242] ? __pfx_task_work_run (kernel/task_work.c:207) 
[ 27.773941][ T242] __x64_sys_getsockopt (net/socket.c:2432) 
[ 27.774110][ T242] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 27.774319][ T242] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 27.774487][ T242] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   27.774696][  T242] RIP: 0033:0x7f5a6180a46e
[ 27.774868][ T242] 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
[   27.775440][  T242] RSP: 002b:00007f5a60eb59c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
[   27.775685][  T242] RAX: ffffffffffffffda RBX: 00007f5a60eb5c80 RCX: 00007f5a6180a46e
[   27.775926][  T242] RDX: 0000000000000029 RSI: 0000000000000006 RDI: 000000000000000a
[   27.776171][  T242] RBP: 00007f5a60eb59e0 R08: 00007f5a60eb59dc R09: 0000000000000064
[   27.776410][  T242] R10: 00007f5a60eb59e0 R11: 0000000000000246 R12: 000000000000000a
[   27.776654][  T242] R13: 0000000000000064 R14: 0000000000000020 R15: 0000000000000064
| [   27.799458][  T242] 1 lock held by icmps-accept_ip/242:
| [ 27.799624][ T242] #0: ffff888002f7aa58 (sk_lock-AF_INET){+.+.}-{0:0}, at: inet_stream_connect (net/ipv4/af_inet.c:748) 
| [   27.799937][  T242]
| [   27.799937][  T242] stack backtrace:
[   27.800434][  T242] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   27.800800][  T242] Call Trace:
[   27.800937][  T242]  <TASK>
[ 27.801028][ T242] dump_stack_lvl (lib/dump_stack.c:123) 
[ 27.801199][ T242] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 27.801370][ T242] tcp_ao_finish_connect (net/ipv4/tcp_ao.c:1183 (discriminator 7)) 
[ 27.801539][ T242] tcp_finish_connect (net/ipv4/tcp_input.c:6340) 
[ 27.801709][ T242] tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6576) 
[ 27.801918][ 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) 
[ 27.802095][ T242] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 27.802227][ T242] ? __pfx_tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6455) 
[ 27.802434][ T242] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 27.802640][ T242] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 27.802803][ 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)) 
[ 27.802943][ T242] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 27.803115][ T242] tcp_rcv_state_process (net/ipv4/tcp_input.c:6796) 
[ 27.803288][ T242] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 27.803453][ T242] ? __release_sock (./include/net/sock.h:1121 net/core/sock.c:3077) 
[ 27.803627][ T242] ? __pfx_tcp_rcv_state_process (net/ipv4/tcp_input.c:6751) 
[ 27.803835][ T242] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 27.803981][ T242] tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1945) 
[ 27.804160][ T242] __release_sock (./include/net/sock.h:1121 net/core/sock.c:3077) 
[ 27.804334][ T242] release_sock (net/core/sock.c:3633) 
[ 27.804519][ T242] inet_stream_connect (net/ipv4/af_inet.c:751) 
[ 27.804689][ T242] __sys_connect (net/socket.c:2071 net/socket.c:2088) 
[ 27.804855][ T242] ? __pfx___sys_connect (net/socket.c:2078) 
[ 27.805043][ T242] ? do_fcntl (fs/fcntl.c:473) 
[ 27.805171][ T242] ? __pfx_do_fcntl (fs/fcntl.c:443) 
[ 27.805338][ T242] ? __fget_files (fs/file.c:1009) 
[ 27.805515][ T242] __x64_sys_connect (net/socket.c:2095) 
[ 27.805681][ T242] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 27.805849][ T242] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   27.806065][  T242] RIP: 0033:0x7f5a6180a40b
[ 27.806239][ 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
[   27.806820][  T242] RSP: 002b:00007f5a60eb5d80 EFLAGS: 00000293 ORIG_RAX: 000000000000002a
[   27.807081][  T242] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00007f5a6180a40b
[   27.807335][  T242] RDX: 0000000000000010 RSI: 00007f5a60eb5e00 RDI: 000000000000000a
[   27.807579][  T242] RBP: 000000000000000a R08: 0000000000000000 R09: 0000000000414400
[   27.807823][  T242] R10: 00007f5a616c2598 R11: 0000000000000293 R12: 000000000040e1c0


Finger prints:
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