======================================
| [   28.369387][  T232] 1 lock held by setsockopt-clos/232:
| [ 28.369541][ T232] #0: ffff88802560b798 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
| [   28.369862][  T232]
| [   28.369862][  T232] stack backtrace:
[   28.370337][  T232] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   28.370704][  T232] Call Trace:
[   28.370848][  T232]  <TASK>
[ 28.370939][ T232] dump_stack_lvl (lib/dump_stack.c:123) 
[ 28.371108][ T232] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 28.371272][ T232] tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2232 (discriminator 7)) 
[ 28.371442][ T232] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 28.371609][ T232] ? __pfx_tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2106) 
[ 28.371826][ T232] ? stack_depot_save_flags (lib/stackdepot.c:664) 
[ 28.372038][ T232] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 28.372186][ T232] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 28.372335][ T232] ? kasan_save_free_info (mm/kasan/generic.c:582) 
[ 28.372491][ T232] ? __kasan_slab_free (mm/kasan/common.c:271) 
[ 28.372638][ T232] ? kfree (mm/slub.c:4579 mm/slub.c:4727) 
[ 28.372749][ T232] ? tcp_ao_parse_crypto (./include/net/tcp_ao.h:67 net/ipv4/tcp_ao.c:1436) 
[ 28.372939][ T232] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 28.373102][ T232] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 28.373248][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.373399][ T232] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 28.373545][ T232] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 28.373695][ T232] ? 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) 
[ 28.373853][ T232] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 28.373976][ T232] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 28.374124][ T232] do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 28.374274][ T232] ? __pfx_do_tcp_getsockopt (net/ipv4/tcp.c:4300) 
[ 28.374430][ T232] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 28.374578][ T232] ? inode_update_timestamps (fs/inode.c:2649 fs/inode.c:2662 fs/inode.c:1997) 
[ 28.374731][ T232] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 28.374888][ T232] ? 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) 
[ 28.375036][ T232] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 28.375152][ T232] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 28.375298][ T232] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 28.375446][ T232] ? ktime_get_coarse_real_ts64 (./include/linux/seqlock.h:74 kernel/time/timekeeping.c:2390) 
[ 28.375633][ T232] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 28.375777][ T232] ? 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) 
[ 28.375941][ T232] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 28.376061][ T232] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 28.376222][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.376372][ T232] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 28.376516][ T232] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 28.376663][ T232] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 28.376817][ T232] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 28.376964][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.377115][ T232] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 28.377440][ T232] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 28.377588][ T232] tcp_getsockopt (net/ipv4/tcp.c:4673 net/ipv4/tcp.c:4664) 
[ 28.377741][ T232] do_sock_getsockopt (net/socket.c:2396) 
[ 28.377898][ T232] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 28.378046][ T232] ? __pfx_do_sock_getsockopt (net/socket.c:2374) 
[ 28.378204][ T232] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 28.378322][ T232] __sys_getsockopt (./include/linux/file.h:35 net/socket.c:2428) 
[ 28.378505][ T232] ? __pfx___sys_getsockopt (net/socket.c:2415) 
[ 28.378662][ T232] ? 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) 
[ 28.378793][ T232] ? ksys_write (./include/linux/file.h:69 ./include/linux/file.h:85 fs/read_write.c:739) 
[ 28.378958][ T232] ? __pfx___sys_socket (net/socket.c:1712) 
[ 28.379123][ T232] ? __pfx_ksys_write (fs/read_write.c:726) 
[ 28.379287][ T232] __x64_sys_getsockopt (net/socket.c:2432) 
[ 28.379444][ T232] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.379640][ T232] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 28.379813][ T232] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   28.380013][  T232] RIP: 0033:0x7f469aff646e
[ 28.380184][ T232] 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
[   28.380772][  T232] RSP: 002b:00007fffe5db3fc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
[   28.381086][  T232] RAX: ffffffffffffffda RBX: 00007fffe5db4160 RCX: 00007f469aff646e
[   28.381330][  T232] RDX: 0000000000000029 RSI: 0000000000000006 RDI: 0000000000000009
[   28.381570][  T232] RBP: 00007fffe5db3fe0 R08: 00007fffe5db3fdc R09: 0000000000000064
[   28.381806][  T232] R10: 00007fffe5db3fe0 R11: 0000000000000246 R12: 0000000000000009
[   28.382045][  T232] R13: 0000000000000064 R14: 0000000000000020 R15: 0000000000000064
| [   28.385391][  T232] 1 lock held by setsockopt-clos/232:
| [ 28.385548][ T232] #0: ffff88802560df58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   28.385834][  T232]
| [   28.385834][  T232] stack backtrace:
[   28.386300][  T232] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   28.386651][  T232] Call Trace:
[   28.386771][  T232]  <TASK>
[ 28.386855][ T232] dump_stack_lvl (lib/dump_stack.c:123) 
[ 28.387015][ T232] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 28.387175][ T232] tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1905 (discriminator 7)) 
[ 28.387328][ T232] ? __pfx_tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1813) 
[ 28.387476][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.387636][ T232] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 28.387791][ T232] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 28.387939][ T232] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 28.388081][ T232] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 28.388236][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.388382][ T232] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 28.388527][ T232] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 28.388689][ T232] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 28.388832][ T232] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 28.388980][ T232] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 28.389149][ T232] do_sock_setsockopt (net/socket.c:2334) 
[ 28.389294][ T232] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 28.389448][ T232] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 28.389561][ T232] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 28.389710][ T232] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 28.389855][ T232] ? __sys_socket (net/socket.c:496 net/socket.c:1725) 
[ 28.389999][ T232] ? __pfx___sys_socket (net/socket.c:1712) 
[ 28.390147][ T232] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.390332][ T232] __x64_sys_setsockopt (net/socket.c:2363) 
[ 28.390488][ T232] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.390667][ T232] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 28.390814][ T232] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   28.390990][  T232] RIP: 0033:0x7f469aff691e
[ 28.391146][ T232] 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
[   28.391664][  T232] RSP: 002b:00007fffe5db4298 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   28.391880][  T232] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f469aff691e
[   28.392099][  T232] RDX: 0000000000000027 RSI: 0000000000000006 RDI: 0000000000000009
[   28.392314][  T232] RBP: 0000000000000009 R08: 0000000000000450 R09: 0000000000000000
[   28.392539][  T232] R10: 00007fffe5db4380 R11: 0000000000000246 R12: 0000000000000027
[   28.392768][  T232] R13: 0000000000000000 R14: 00007fffe5db4380 R15: 0000000000410699
| [   28.422919][  T232] 1 lock held by setsockopt-clos/232:
| [ 28.423164][ T232] #0: ffff888025742a58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   28.423645][  T232]
| [   28.423645][  T232] stack backtrace:
[   28.424440][  T232] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   28.424992][  T232] Call Trace:
[   28.425191][  T232]  <TASK>
[ 28.425324][ T232] dump_stack_lvl (lib/dump_stack.c:123) 
[ 28.425588][ T232] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 28.425864][ T232] __tcp_ao_do_lookup.part.0 (net/ipv4/tcp_ao.c:208) 
[ 28.426137][ T232] tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1698) 
[ 28.426402][ T232] ? __pfx_tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1597) 
[ 28.426651][ T232] ? 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) 
[ 28.426922][ T232] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 28.427230][ T232] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 28.427488][ T232] ? do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 28.427739][ T232] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 28.427995][ T232] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 28.428262][ T232] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 28.428535][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 28.428783][ T232] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 28.429033][ T232] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 28.429285][ T232] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 28.429548][ T232] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 28.429802][ T232] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 28.430062][ T232] do_sock_setsockopt (net/socket.c:2334) 
[ 28.430331][ T232] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 28.430600][ T232] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 28.430865][ T232] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 28.431069][ T232] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 28.431313][ T232] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 28.431580][ T232] ? __sys_socket (net/socket.c:496 net/socket.c:1725) 
[ 28.431841][ T232] ? __pfx___sys_socket (net/socket.c:1712) 
[ 28.432089][ T232] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.432402][ T232] __x64_sys_setsockopt (net/socket.c:2363) 
[ 28.432637][ T232] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 28.432960][ T232] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 28.433210][ T232] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   28.433514][  T232] RIP: 0033:0x7f469aff691e
[ 28.433797][ T232] 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
[   28.434669][  T232] RSP: 002b:00007fffe5db4588 EFLAGS: 00000202 ORIG_RAX: 0000000000000036
[   28.435060][  T232] RAX: ffffffffffffffda RBX: 00000000000001b4 RCX: 00007f469aff691e
[   28.435419][  T232] RDX: 0000000000000026 RSI: 0000000000000006 RDI: 0000000000000009
[   28.435785][  T232] RBP: 0000000000000009 R08: 0000000000000120 R09: 0029383231736561
[   28.436138][  T232] R10: 00007fffe5db46c0 R11: 0000000000000202 R12: 0000000000001108
[   28.436488][  T232] R13: 0000000000000001 R14: 0000000000000002 R15: 0000000401fe000a
| [   29.018079][  T232] 1 lock held by setsockopt-clos/232:
| [ 29.018258][ T232] #0: ffff888025608fd8 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   29.018620][  T232]
| [   29.018620][  T232] stack backtrace:
[   29.019107][  T232] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   29.019545][  T232] Call Trace:
[   29.019675][  T232]  <TASK>
[ 29.019760][ T232] dump_stack_lvl (lib/dump_stack.c:123) 
[ 29.019930][ T232] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 29.020112][ T232] tcp_ao_established_key (net/ipv4/tcp_ao.c:117 (discriminator 7)) 
[ 29.020288][ T232] tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1860) 
[ 29.020466][ T232] ? __pfx_tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1813) 
[ 29.020636][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 29.020809][ T232] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 29.020987][ T232] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 29.021159][ T232] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 29.021343][ T232] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 29.021523][ T232] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 29.021704][ T232] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 29.021863][ T232] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 29.022026][ T232] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 29.022191][ T232] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 29.022411][ T232] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 29.022589][ T232] do_sock_setsockopt (net/socket.c:2334) 
[ 29.022782][ T232] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 29.022973][ T232] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 29.023116][ T232] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 29.023314][ T232] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 29.023489][ T232] ? __sys_socket (net/socket.c:496 net/socket.c:1725) 
[ 29.023657][ T232] ? __pfx___sys_socket (net/socket.c:1712) 
[ 29.023830][ T232] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 29.024043][ T232] __x64_sys_setsockopt (net/socket.c:2363) 
[ 29.024216][ T232] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 29.024432][ T232] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 29.024614][ T232] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   29.024817][  T232] RIP: 0033:0x7f469aff691e
[ 29.025005][ T232] 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
[   29.025617][  T232] RSP: 002b:00007fffe5db4448 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   29.025866][  T232] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f469aff691e
[   29.026133][  T232] RDX: 0000000000000027 RSI: 0000000000000006 RDI: 0000000000000009
[   29.026415][  T232] RBP: 0000000000000009 R08: 0000000000000090 R09: 0000000000000002
[   29.026715][  T232] R10: 00007fffe5db4500 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