======================================
| [   26.190854][  T233] 1 lock held by setsockopt-clos/233:
| [ 26.191022][ T233] #0: ffff8880058ab798 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
| [   26.191351][  T233]
| [   26.191351][  T233] stack backtrace:
[   26.191832][  T233] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   26.192182][  T233] Call Trace:
[   26.192313][  T233]  <TASK>
[ 26.192408][ T233] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.192578][ T233] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 26.192745][ T233] tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2232 (discriminator 7)) 
[ 26.192907][ T233] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 26.193074][ T233] ? __pfx_tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2106) 
[ 26.193274][ T233] ? stack_depot_save_flags (lib/stackdepot.c:664) 
[ 26.193448][ T233] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 26.193605][ T233] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 26.193762][ T233] ? kasan_save_free_info (mm/kasan/generic.c:582) 
[ 26.193920][ T233] ? __kasan_slab_free (mm/kasan/common.c:271) 
[ 26.194078][ T233] ? kfree (mm/slub.c:4579 mm/slub.c:4727) 
[ 26.194200][ T233] ? tcp_ao_parse_crypto (./include/net/tcp_ao.h:67 net/ipv4/tcp_ao.c:1436) 
[ 26.194398][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.194570][ T233] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 26.194729][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.194893][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.195052][ T233] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 26.195215][ T233] ? 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) 
[ 26.195376][ T233] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.195509][ T233] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 26.195669][ T233] do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 26.195833][ T233] ? __pfx_do_tcp_getsockopt (net/ipv4/tcp.c:4300) 
[ 26.196005][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.196165][ T233] ? inode_update_timestamps (fs/inode.c:2649 fs/inode.c:2662 fs/inode.c:1997) 
[ 26.196341][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 26.196502][ T233] ? 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) 
[ 26.196662][ T233] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.196790][ T233] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 26.196950][ T233] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 26.197114][ T233] ? ktime_get_coarse_real_ts64 (./include/linux/seqlock.h:74 kernel/time/timekeeping.c:2390) 
[ 26.197319][ T233] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 26.197479][ T233] ? 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) 
[ 26.197644][ T233] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.197772][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.197950][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.198114][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.198271][ T233] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 26.198435][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 26.198594][ T233] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 26.198766][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.198928][ T233] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 26.199090][ T233] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 26.199254][ T233] tcp_getsockopt (net/ipv4/tcp.c:4673 net/ipv4/tcp.c:4664) 
[ 26.199417][ T233] do_sock_getsockopt (net/socket.c:2396) 
[ 26.199578][ T233] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 26.199738][ T233] ? __pfx_do_sock_getsockopt (net/socket.c:2374) 
[ 26.199907][ T233] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 26.200035][ T233] __sys_getsockopt (./include/linux/file.h:35 net/socket.c:2428) 
[ 26.200196][ T233] ? __pfx___sys_getsockopt (net/socket.c:2415) 
[ 26.200357][ T233] ? 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) 
[ 26.200487][ T233] ? ksys_write (./include/linux/file.h:69 ./include/linux/file.h:85 fs/read_write.c:739) 
[ 26.200648][ T233] ? __pfx___sys_socket (net/socket.c:1712) 
[ 26.200808][ T233] ? __pfx_ksys_write (fs/read_write.c:726) 
[ 26.200971][ T233] __x64_sys_getsockopt (net/socket.c:2432) 
[ 26.201129][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.201332][ T233] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.201495][ T233] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.201696][  T233] RIP: 0033:0x7f8ae7ea246e
[ 26.201871][ T233] 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
[   26.202431][  T233] RSP: 002b:00007ffe45db77e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
[   26.202677][  T233] RAX: ffffffffffffffda RBX: 00007ffe45db7980 RCX: 00007f8ae7ea246e
[   26.202922][  T233] RDX: 0000000000000029 RSI: 0000000000000006 RDI: 0000000000000009
[   26.203172][  T233] RBP: 00007ffe45db7800 R08: 00007ffe45db77fc R09: 0000000000000064
[   26.203412][  T233] R10: 00007ffe45db7800 R11: 0000000000000246 R12: 0000000000000009
[   26.203662][  T233] R13: 0000000000000064 R14: 0000000000000020 R15: 0000000000000064
| [   26.208552][  T233] 1 lock held by setsockopt-clos/233:
| [ 26.208721][ T233] #0: ffff8880058adf58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   26.209014][  T233]
| [   26.209014][  T233] stack backtrace:
[   26.209482][  T233] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   26.209832][  T233] Call Trace:
[   26.209955][  T233]  <TASK>
[ 26.210038][ T233] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.210202][ T233] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 26.210368][ T233] tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1905 (discriminator 7)) 
[ 26.210530][ T233] ? __pfx_tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1813) 
[ 26.210696][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.210869][ T233] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 26.211040][ T233] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 26.211203][ T233] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 26.211359][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.211526][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.211687][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.211847][ T233] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 26.212005][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 26.212161][ T233] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 26.212339][ T233] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 26.212505][ T233] do_sock_setsockopt (net/socket.c:2334) 
[ 26.212663][ T233] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 26.212833][ T233] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 26.212960][ T233] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 26.213120][ T233] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 26.213278][ T233] ? __sys_socket (net/socket.c:496 net/socket.c:1725) 
[ 26.213439][ T233] ? __pfx___sys_socket (net/socket.c:1712) 
[ 26.213598][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.213801][ T233] __x64_sys_setsockopt (net/socket.c:2363) 
[ 26.213959][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.214151][ T233] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.214314][ T233] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.214520][  T233] RIP: 0033:0x7f8ae7ea291e
[ 26.214687][ T233] 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
[   26.215239][  T233] RSP: 002b:00007ffe45db7ab8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   26.215478][  T233] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8ae7ea291e
[   26.215718][  T233] RDX: 0000000000000027 RSI: 0000000000000006 RDI: 0000000000000009
[   26.215955][  T233] RBP: 0000000000000009 R08: 0000000000000450 R09: 0000000000000000
[   26.216194][  T233] R10: 00007ffe45db7ba0 R11: 0000000000000246 R12: 0000000000000027
[   26.216430][  T233] R13: 0000000000000000 R14: 00007ffe45db7ba0 R15: 0000000000410699
| [   26.281353][  T233] 1 lock held by setsockopt-clos/233:
| [ 26.281508][ T233] #0: ffff88800530aa58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   26.281780][  T233]
| [   26.281780][  T233] stack backtrace:
[   26.282222][  T233] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   26.282553][  T233] Call Trace:
[   26.282666][  T233]  <TASK>
[ 26.282746][ T233] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.282898][ T233] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 26.283052][ T233] __tcp_ao_do_lookup.part.0 (net/ipv4/tcp_ao.c:208) 
[ 26.283210][ T233] tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1698) 
[ 26.283362][ T233] ? __pfx_tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1597) 
[ 26.283516][ T233] ? 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) 
[ 26.283668][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.283840][ T233] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 26.283992][ T233] ? do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 26.284142][ T233] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 26.284290][ T233] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 26.284437][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.284595][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.284745][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.284893][ T233] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 26.285042][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 26.285187][ T233] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 26.285333][ T233] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 26.285486][ T233] do_sock_setsockopt (net/socket.c:2334) 
[ 26.285634][ T233] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 26.285790][ T233] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 26.285943][ T233] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 26.286061][ T233] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 26.286210][ T233] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 26.286359][ T233] ? __sys_socket (net/socket.c:496 net/socket.c:1725) 
[ 26.286507][ T233] ? __pfx___sys_socket (net/socket.c:1712) 
[ 26.286653][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.286837][ T233] __x64_sys_setsockopt (net/socket.c:2363) 
[ 26.286984][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.287169][ T233] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.287317][ T233] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.287500][  T233] RIP: 0033:0x7f8ae7ea291e
[ 26.287653][ T233] 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
[   26.288161][  T233] RSP: 002b:00007ffe45db7da8 EFLAGS: 00000202 ORIG_RAX: 0000000000000036
[   26.288386][  T233] RAX: ffffffffffffffda RBX: 00000000000001b4 RCX: 00007f8ae7ea291e
[   26.288609][  T233] RDX: 0000000000000026 RSI: 0000000000000006 RDI: 0000000000000009
[   26.288852][  T233] RBP: 0000000000000009 R08: 0000000000000120 R09: 0029383231736561
[   26.289071][  T233] R10: 00007ffe45db7ee0 R11: 0000000000000202 R12: 0000000000001108
[   26.289290][  T233] R13: 0000000000000001 R14: 0000000000000002 R15: 0000000401fe000a
| [   26.788303][  T233] 1 lock held by setsockopt-clos/233:
| [ 26.788463][ T233] #0: ffff888007668fd8 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   26.788756][  T233]
| [   26.788756][  T233] stack backtrace:
[   26.789213][  T233] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   26.789536][  T233] Call Trace:
[   26.789660][  T233]  <TASK>
[ 26.789742][ T233] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.789903][ T233] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 26.790054][ T233] tcp_ao_established_key (net/ipv4/tcp_ao.c:117 (discriminator 7)) 
[ 26.790221][ T233] tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1860) 
[ 26.790379][ T233] ? __pfx_tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1813) 
[ 26.790541][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.790705][ T233] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 26.790862][ T233] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 26.791018][ T233] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 26.791167][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.791321][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.791477][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.791638][ T233] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 26.791789][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 26.791945][ T233] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 26.792100][ T233] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 26.792252][ T233] do_sock_setsockopt (net/socket.c:2334) 
[ 26.792413][ T233] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 26.792572][ T233] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 26.792687][ T233] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 26.792839][ T233] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 26.792996][ T233] ? __sys_socket (net/socket.c:496 net/socket.c:1725) 
[ 26.793145][ T233] ? __pfx___sys_socket (net/socket.c:1712) 
[ 26.793291][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.793473][ T233] __x64_sys_setsockopt (net/socket.c:2363) 
[ 26.793619][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 26.793798][ T233] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.793946][ T233] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.794128][  T233] RIP: 0033:0x7f8ae7ea291e
[ 26.794280][ T233] 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
[   26.794782][  T233] RSP: 002b:00007ffe45db7c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   26.795003][  T233] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8ae7ea291e
[   26.795220][  T233] RDX: 0000000000000027 RSI: 0000000000000006 RDI: 0000000000000009
[   26.795443][  T233] RBP: 0000000000000009 R08: 0000000000000090 R09: 0000000000000002
[   26.795663][  T233] R10: 00007ffe45db7d20 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