======================================
| [   28.702235][  T234] 1 lock held by setsockopt-clos/234:
| [ 28.702803][ T234] #0: ffff888007ca3798 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
| [   28.703163][  T234]
| [   28.703163][  T234] stack backtrace:
[   28.703731][  T234] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   28.704131][  T234] Call Trace:
[   28.704275][  T234]  <TASK>
[ 28.704377][ T234] dump_stack_lvl (lib/dump_stack.c:123) 
[ 28.704570][ T234] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 28.704754][ T234] tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2232 (discriminator 7)) 
[ 28.704944][ T234] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 28.705121][ T234] ? __pfx_tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2106) 
[ 28.705330][ T234] ? stack_depot_save_flags (lib/stackdepot.c:664) 
[ 28.705527][ T234] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 28.705719][ T234] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 28.705895][ T234] ? kasan_save_free_info (mm/kasan/generic.c:582) 
[ 28.706081][ T234] ? __kasan_slab_free (mm/kasan/common.c:271) 
[ 28.706287][ T234] ? kfree (mm/slub.c:4579 mm/slub.c:4727) 
[ 28.706427][ T234] ? tcp_ao_parse_crypto (./include/net/tcp_ao.h:67 net/ipv4/tcp_ao.c:1436) 
[ 28.706658][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 28.706857][ T234] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 28.707050][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.707234][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 28.707413][ T234] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 28.707604][ 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) 
[ 28.707788][ T234] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 28.707933][ T234] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 28.708118][ T234] do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 28.708304][ T234] ? __pfx_do_tcp_getsockopt (net/ipv4/tcp.c:4300) 
[ 28.708512][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 28.708690][ T234] ? inode_update_timestamps (fs/inode.c:2649 fs/inode.c:2662 fs/inode.c:1997) 
[ 28.708878][ T234] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 28.709061][ 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) 
[ 28.709255][ T234] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 28.709386][ T234] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 28.709559][ T234] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 28.709730][ T234] ? ktime_get_coarse_real_ts64 (./include/linux/seqlock.h:74 kernel/time/timekeeping.c:2390) 
[ 28.709972][ T234] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 28.710151][ 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) 
[ 28.710321][ T234] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 28.710460][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 28.710654][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.710839][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 28.711043][ T234] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 28.711222][ T234] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 28.711396][ T234] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 28.711583][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.711766][ T234] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 28.711953][ T234] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 28.712144][ T234] tcp_getsockopt (net/ipv4/tcp.c:4673 net/ipv4/tcp.c:4664) 
[ 28.712328][ T234] do_sock_getsockopt (net/socket.c:2396) 
[ 28.712512][ T234] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 28.712692][ T234] ? __pfx_do_sock_getsockopt (net/socket.c:2374) 
[ 28.712888][ T234] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 28.713033][ T234] __sys_getsockopt (./include/linux/file.h:35 net/socket.c:2428) 
[ 28.713232][ T234] ? __pfx___sys_getsockopt (net/socket.c:2415) 
[ 28.713414][ T234] ? fput (./arch/x86/include/asm/atomic64_64.h:61 ./include/linux/atomic/atomic-arch-fallback.h:4404 ./include/linux/atomic/atomic-long.h:1571 ./include/linux/atomic/atomic-instrumented.h:4540 fs/file_table.c:482) 
[ 28.713559][ T234] ? ksys_write (./include/linux/file.h:69 ./include/linux/file.h:85 fs/read_write.c:739) 
[ 28.713737][ T234] ? __pfx___sys_socket (net/socket.c:1712) 
[ 28.713923][ T234] ? __pfx_ksys_write (fs/read_write.c:726) 
[ 28.714123][ T234] __x64_sys_getsockopt (net/socket.c:2432) 
[ 28.714303][ T234] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.714537][ T234] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 28.714731][ T234] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   28.714965][  T234] RIP: 0033:0x7f9e767c746e
[ 28.715173][ 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
[   28.715811][  T234] RSP: 002b:00007ffe54838e48 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
[   28.716108][  T234] RAX: ffffffffffffffda RBX: 00007ffe54838fe0 RCX: 00007f9e767c746e
[   28.716381][  T234] RDX: 0000000000000029 RSI: 0000000000000006 RDI: 0000000000000009
[   28.716653][  T234] RBP: 00007ffe54838e60 R08: 00007ffe54838e5c R09: 0000000000000064
[   28.716920][  T234] R10: 00007ffe54838e60 R11: 0000000000000246 R12: 0000000000000009
[   28.717196][  T234] R13: 0000000000000064 R14: 0000000000000020 R15: 0000000000000064
| [   28.722280][  T234] 1 lock held by setsockopt-clos/234:
| [ 28.722483][ T234] #0: ffff888007ca5f58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   28.722846][  T234]
| [   28.722846][  T234] stack backtrace:
[   28.723385][  T234] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   28.723793][  T234] Call Trace:
[   28.723948][  T234]  <TASK>
[ 28.724044][ T234] dump_stack_lvl (lib/dump_stack.c:123) 
[ 28.724245][ T234] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 28.724434][ T234] tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1905 (discriminator 7)) 
[ 28.724636][ T234] ? __pfx_tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1813) 
[ 28.724839][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.725040][ T234] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 28.725227][ T234] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 28.725430][ T234] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 28.725615][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 28.725845][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.726042][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 28.726231][ T234] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 28.726433][ T234] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 28.726610][ T234] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 28.726837][ T234] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 28.727018][ T234] do_sock_setsockopt (net/socket.c:2334) 
[ 28.727210][ T234] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 28.727396][ T234] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 28.727548][ T234] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 28.727741][ T234] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 28.727945][ T234] ? __sys_socket (net/socket.c:496 net/socket.c:1725) 
[ 28.728131][ T234] ? __pfx___sys_socket (net/socket.c:1712) 
[ 28.728316][ T234] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.728548][ T234] __x64_sys_setsockopt (net/socket.c:2363) 
[ 28.728748][ T234] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.728979][ T234] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 28.729159][ T234] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   28.729396][  T234] RIP: 0033:0x7f9e767c791e
[ 28.729600][ 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
[   28.730251][  T234] RSP: 002b:00007ffe54839118 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   28.730542][  T234] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9e767c791e
[   28.730860][  T234] RDX: 0000000000000027 RSI: 0000000000000006 RDI: 0000000000000009
[   28.731129][  T234] RBP: 0000000000000009 R08: 0000000000000450 R09: 0000000000000000
[   28.731384][  T234] R10: 00007ffe54839200 R11: 0000000000000246 R12: 0000000000000027
[   28.731693][  T234] R13: 0000000000000000 R14: 00007ffe54839200 R15: 0000000000410699
| [   28.806421][  T234] 1 lock held by setsockopt-clos/234:
| [ 28.806610][ T234] #0: ffff8880252caa58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   28.806964][  T234]
| [   28.806964][  T234] stack backtrace:
[   28.807517][  T234] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   28.807911][  T234] Call Trace:
[   28.808040][  T234]  <TASK>
[ 28.808131][ T234] dump_stack_lvl (lib/dump_stack.c:123) 
[ 28.808297][ T234] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 28.808500][ T234] __tcp_ao_do_lookup.part.0 (net/ipv4/tcp_ao.c:208) 
[ 28.808683][ T234] tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1698) 
[ 28.808878][ T234] ? __pfx_tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1597) 
[ 28.809063][ 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) 
[ 28.809231][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 28.809425][ T234] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 28.809604][ T234] ? do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 28.809796][ T234] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 28.809976][ T234] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 28.810168][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 28.810347][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.810534][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 28.810696][ T234] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 28.810874][ T234] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 28.811048][ T234] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 28.811240][ T234] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 28.811428][ T234] do_sock_setsockopt (net/socket.c:2334) 
[ 28.811622][ T234] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 28.811806][ T234] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 28.811989][ T234] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 28.812136][ T234] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 28.812300][ T234] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 28.812480][ T234] ? __sys_socket (net/socket.c:496 net/socket.c:1725) 
[ 28.812654][ T234] ? __pfx___sys_socket (net/socket.c:1712) 
[ 28.812848][ T234] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.813071][ T234] __x64_sys_setsockopt (net/socket.c:2363) 
[ 28.813273][ T234] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.813499][ T234] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 28.813693][ T234] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   28.813916][  T234] RIP: 0033:0x7f9e767c791e
[ 28.814117][ 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
[   28.814743][  T234] RSP: 002b:00007ffe54839408 EFLAGS: 00000202 ORIG_RAX: 0000000000000036
[   28.815028][  T234] RAX: ffffffffffffffda RBX: 00000000000001b4 RCX: 00007f9e767c791e
[   28.815370][  T234] RDX: 0000000000000026 RSI: 0000000000000006 RDI: 0000000000000009
[   28.815658][  T234] RBP: 0000000000000009 R08: 0000000000000120 R09: 0029383231736561
[   28.815924][  T234] R10: 00007ffe54839540 R11: 0000000000000202 R12: 0000000000001108
[   28.816200][  T234] R13: 0000000000000001 R14: 0000000000000002 R15: 0000000401fe000a
| [   29.371376][  T234] 1 lock held by setsockopt-clos/234:
| [ 29.371682][ T234] #0: ffff888007ca3798 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   29.372199][  T234]
| [   29.372199][  T234] stack backtrace:
[   29.373041][  T234] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   29.373688][  T234] Call Trace:
[   29.373901][  T234]  <TASK>
[ 29.374041][ T234] dump_stack_lvl (lib/dump_stack.c:123) 
[ 29.374318][ T234] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 29.374598][ T234] tcp_ao_established_key (net/ipv4/tcp_ao.c:117 (discriminator 7)) 
[ 29.374883][ T234] tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1860) 
[ 29.375156][ T234] ? __pfx_tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1813) 
[ 29.375445][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 29.375732][ T234] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 29.376018][ T234] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 29.376317][ T234] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 29.376574][ T234] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 29.376855][ T234] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 29.377141][ T234] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 29.377410][ T234] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 29.377684][ T234] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 29.377960][ T234] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 29.378236][ T234] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 29.378504][ T234] do_sock_setsockopt (net/socket.c:2334) 
[ 29.378772][ T234] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 29.379055][ T234] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 29.379273][ T234] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 29.379538][ T234] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 29.379813][ T234] ? __sys_socket (net/socket.c:496 net/socket.c:1725) 
[ 29.380083][ T234] ? __pfx___sys_socket (net/socket.c:1712) 
[ 29.380348][ T234] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 29.380693][ T234] __x64_sys_setsockopt (net/socket.c:2363) 
[ 29.380964][ T234] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 29.381290][ T234] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 29.381562][ T234] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   29.381884][  T234] RIP: 0033:0x7f9e767c791e
[ 29.382161][ 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
[   29.383078][  T234] RSP: 002b:00007ffe548392c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   29.383491][  T234] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9e767c791e
[   29.383894][  T234] RDX: 0000000000000027 RSI: 0000000000000006 RDI: 0000000000000009
[   29.384291][  T234] RBP: 0000000000000009 R08: 0000000000000090 R09: 0000000000000002
[   29.384693][  T234] R10: 00007ffe54839380 R11: 0000000000000246 R12: 0000000000000027


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_copy_mkts_to_user:do_tcp_getsockopt:tcp_getsockopt:do_sock_getsockopt
lockdep_rcu_suspicious:tcp_ao_established_key:tcp_ao_del_cmd:do_tcp_setsockopt:do_sock_setsockopt