======================================
| [   24.857136][  T233] 1 lock held by setsockopt-clos/233:
| [ 24.857300][ T233] #0: ffff888007aeb798 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
| [   24.857575][  T233]
| [   24.857575][  T233] stack backtrace:
[   24.858008][  T233] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   24.858328][  T233] Call Trace:
[   24.858443][  T233]  <TASK>
[ 24.858521][ T233] dump_stack_lvl (lib/dump_stack.c:123) 
[ 24.858675][ T233] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 24.858827][ T233] tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2232 (discriminator 7)) 
[ 24.858976][ T233] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 24.859130][ T233] ? __pfx_tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2106) 
[ 24.859318][ T233] ? stack_depot_save_flags (lib/stackdepot.c:664) 
[ 24.859469][ T233] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 24.859615][ T233] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 24.859758][ T233] ? kasan_save_free_info (mm/kasan/generic.c:582) 
[ 24.859902][ T233] ? __kasan_slab_free (mm/kasan/common.c:271) 
[ 24.860047][ T233] ? kfree (mm/slub.c:4579 mm/slub.c:4727) 
[ 24.860160][ T233] ? tcp_ao_parse_crypto (./include/net/tcp_ao.h:67 net/ipv4/tcp_ao.c:1436) 
[ 24.860335][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 24.860490][ T233] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 24.860635][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 24.860784][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 24.860929][ T233] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 24.861077][ 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) 
[ 24.861222][ T233] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 24.861344][ T233] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 24.861488][ T233] do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 24.861637][ T233] ? __pfx_do_tcp_getsockopt (net/ipv4/tcp.c:4300) 
[ 24.861793][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 24.861939][ T233] ? inode_update_timestamps (fs/inode.c:2649 fs/inode.c:2662 fs/inode.c:1997) 
[ 24.862085][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 24.862234][ 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) 
[ 24.862378][ T233] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 24.862495][ T233] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 24.862645][ T233] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 24.862796][ T233] ? ktime_get_coarse_real_ts64 (./include/linux/seqlock.h:74 kernel/time/timekeeping.c:2390) 
[ 24.862981][ T233] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 24.863126][ 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) 
[ 24.863272][ T233] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 24.863390][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 24.863546][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 24.863693][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 24.863837][ T233] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 24.863981][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 24.864123][ T233] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 24.864267][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 24.864417][ T233] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 24.864563][ T233] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 24.864715][ T233] tcp_getsockopt (net/ipv4/tcp.c:4673 net/ipv4/tcp.c:4664) 
[ 24.864865][ T233] do_sock_getsockopt (net/socket.c:2396) 
[ 24.865010][ T233] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 24.865157][ T233] ? __pfx_do_sock_getsockopt (net/socket.c:2374) 
[ 24.865310][ T233] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 24.865425][ T233] __sys_getsockopt (./include/linux/file.h:35 net/socket.c:2428) 
[ 24.865573][ T233] ? __pfx___sys_getsockopt (net/socket.c:2415) 
[ 24.865717][ 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) 
[ 24.865832][ T233] ? ksys_write (./include/linux/file.h:69 ./include/linux/file.h:85 fs/read_write.c:739) 
[ 24.865975][ T233] ? __pfx___sys_socket (net/socket.c:1712) 
[ 24.866120][ T233] ? __pfx_ksys_write (fs/read_write.c:726) 
[ 24.866269][ T233] __x64_sys_getsockopt (net/socket.c:2432) 
[ 24.866413][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 24.866595][ T233] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 24.866749][ T233] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   24.866930][  T233] RIP: 0033:0x7fc0cbfe646e
[ 24.867085][ 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
[   24.867588][  T233] RSP: 002b:00007ffcd6d72858 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
[   24.867806][  T233] RAX: ffffffffffffffda RBX: 00007ffcd6d729f0 RCX: 00007fc0cbfe646e
[   24.868021][  T233] RDX: 0000000000000029 RSI: 0000000000000006 RDI: 0000000000000009
[   24.868240][  T233] RBP: 00007ffcd6d72870 R08: 00007ffcd6d7286c R09: 0000000000000064
[   24.868454][  T233] R10: 00007ffcd6d72870 R11: 0000000000000246 R12: 0000000000000009
[   24.868668][  T233] R13: 0000000000000064 R14: 0000000000000020 R15: 0000000000000064
| [   24.873095][  T233] 1 lock held by setsockopt-clos/233:
| [ 24.873251][ T233] #0: ffff888007aedf58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   24.873519][  T233]
| [   24.873519][  T233] stack backtrace:
[   24.873941][  T233] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   24.874254][  T233] Call Trace:
[   24.874365][  T233]  <TASK>
[ 24.874442][ T233] dump_stack_lvl (lib/dump_stack.c:123) 
[ 24.874589][ T233] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 24.874737][ T233] tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1905 (discriminator 7)) 
[ 24.874886][ T233] ? __pfx_tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1813) 
[ 24.875037][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 24.875195][ T233] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 24.875357][ T233] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 24.875504][ T233] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 24.875647][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 24.875799][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 24.875945][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 24.876086][ T233] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 24.876234][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 24.876376][ T233] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 24.876520][ T233] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 24.876673][ T233] do_sock_setsockopt (net/socket.c:2334) 
[ 24.876817][ T233] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 24.876969][ T233] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 24.877084][ T233] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 24.877229][ T233] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 24.877371][ T233] ? __sys_socket (net/socket.c:496 net/socket.c:1725) 
[ 24.877516][ T233] ? __pfx___sys_socket (net/socket.c:1712) 
[ 24.877660][ T233] ? __local_bh_enable (kernel/softirq.c:343) 
[ 24.877818][ T233] __x64_sys_setsockopt (net/socket.c:2363) 
[ 24.877960][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 24.878138][ T233] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 24.878286][ T233] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   24.878462][  T233] RIP: 0033:0x7fc0cbfe691e
[ 24.878611][ 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
[   24.879109][  T233] RSP: 002b:00007ffcd6d72b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   24.879338][  T233] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc0cbfe691e
[   24.879550][  T233] RDX: 0000000000000027 RSI: 0000000000000006 RDI: 0000000000000009
[   24.879764][  T233] RBP: 0000000000000009 R08: 0000000000000450 R09: 0000000000000000
[   24.879978][  T233] R10: 00007ffcd6d72c10 R11: 0000000000000246 R12: 0000000000000027
[   24.880194][  T233] R13: 0000000000000000 R14: 00007ffcd6d72c10 R15: 0000000000410699
| [   24.938185][  T233] 1 lock held by setsockopt-clos/233:
| [ 24.938333][ T233] #0: ffff8880059caa58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   24.938698][  T233]
| [   24.938698][  T233] stack backtrace:
[   24.939132][  T233] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   24.939448][  T233] Call Trace:
[   24.939563][  T233]  <TASK>
[ 24.939641][ T233] dump_stack_lvl (lib/dump_stack.c:123) 
[ 24.939794][ T233] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 24.939942][ T233] __tcp_ao_do_lookup.part.0 (net/ipv4/tcp_ao.c:208) 
[ 24.940092][ T233] tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1698) 
[ 24.940243][ T233] ? __pfx_tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1597) 
[ 24.940389][ 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) 
[ 24.940542][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 24.940713][ T233] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 24.940864][ T233] ? do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 24.941012][ T233] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 24.941161][ T233] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 24.941304][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 24.941462][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 24.941613][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 24.941756][ T233] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 24.941901][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 24.942044][ T233] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 24.942193][ T233] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 24.942341][ T233] do_sock_setsockopt (net/socket.c:2334) 
[ 24.942489][ T233] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 24.942645][ T233] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 24.942792][ T233] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 24.942907][ T233] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 24.943053][ T233] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 24.943196][ T233] ? __sys_socket (net/socket.c:496 net/socket.c:1725) 
[ 24.943346][ T233] ? __pfx___sys_socket (net/socket.c:1712) 
[ 24.943494][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 24.943676][ T233] __x64_sys_setsockopt (net/socket.c:2363) 
[ 24.943819][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 24.943997][ T233] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 24.944145][ T233] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   24.944325][  T233] RIP: 0033:0x7fc0cbfe691e
[ 24.944481][ 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
[   24.944981][  T233] RSP: 002b:00007ffcd6d72e18 EFLAGS: 00000202 ORIG_RAX: 0000000000000036
[   24.945200][  T233] RAX: ffffffffffffffda RBX: 00000000000001b4 RCX: 00007fc0cbfe691e
[   24.945419][  T233] RDX: 0000000000000026 RSI: 0000000000000006 RDI: 0000000000000009
[   24.945638][  T233] RBP: 0000000000000009 R08: 0000000000000120 R09: 0029383231736561
[   24.945852][  T233] R10: 00007ffcd6d72f50 R11: 0000000000000202 R12: 0000000000001108
[   24.946068][  T233] R13: 0000000000000001 R14: 0000000000000002 R15: 0000000401fe000a
| [   25.418403][  T233] 1 lock held by setsockopt-clos/233:
| [ 25.418551][ T233] #0: ffff888006c30fd8 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   25.418831][  T233]
| [   25.418831][  T233] stack backtrace:
[   25.419285][  T233] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   25.419609][  T233] Call Trace:
[   25.419733][  T233]  <TASK>
[ 25.419810][ T233] dump_stack_lvl (lib/dump_stack.c:123) 
[ 25.419973][ T233] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 25.420133][ T233] tcp_ao_established_key (net/ipv4/tcp_ao.c:117 (discriminator 7)) 
[ 25.420292][ T233] tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1860) 
[ 25.420446][ T233] ? __pfx_tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1813) 
[ 25.420606][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 25.420776][ T233] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 25.420933][ T233] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 25.421079][ T233] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 25.421231][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 25.421386][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 25.421536][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 25.421690][ T233] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 25.421836][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 25.421988][ T233] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 25.422138][ T233] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 25.422299][ T233] do_sock_setsockopt (net/socket.c:2334) 
[ 25.422451][ T233] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 25.422611][ T233] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 25.422726][ T233] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 25.422872][ T233] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 25.423014][ T233] ? __sys_socket (net/socket.c:496 net/socket.c:1725) 
[ 25.423161][ T233] ? __pfx___sys_socket (net/socket.c:1712) 
[ 25.423309][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 25.423491][ T233] __x64_sys_setsockopt (net/socket.c:2363) 
[ 25.423633][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 25.423813][ T233] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 25.423958][ T233] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   25.424139][  T233] RIP: 0033:0x7fc0cbfe691e
[ 25.424291][ 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
[   25.424794][  T233] RSP: 002b:00007ffcd6d72cd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   25.425012][  T233] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc0cbfe691e
[   25.425227][  T233] RDX: 0000000000000027 RSI: 0000000000000006 RDI: 0000000000000009
[   25.425440][  T233] RBP: 0000000000000009 R08: 0000000000000090 R09: 0000000000000002
[   25.425656][  T233] R10: 00007ffcd6d72d90 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