======================================
| [   33.438326][  T233] 1 lock held by bench-lookups_i/233:
| [ 33.438605][ T233] #0: ffff88800511aa58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
| [   33.439108][  T233]
| [   33.439108][  T233] stack backtrace:
[   33.439880][  T233] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   33.440446][  T233] Call Trace:
[   33.440654][  T233]  <TASK>
[ 33.440792][ T233] dump_stack_lvl (lib/dump_stack.c:123) 
[ 33.441264][ T233] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 33.441535][ T233] tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2232 (discriminator 7)) 
[ 33.441806][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 33.442086][ T233] ? __pfx_tcp_ao_copy_mkts_to_user (net/ipv4/tcp_ao.c:2106) 
[ 33.442410][ T233] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 33.442670][ T233] ? __pte_offset_map_lock (./include/linux/pgtable.h:324 ./include/linux/pgtable.h:594 mm/pgtable-generic.c:376) 
[ 33.442933][ T233] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 33.443193][ T233] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 33.443451][ T233] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 33.443761][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 33.444037][ T233] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 33.444294][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 33.444556][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 33.444829][ T233] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 33.445087][ 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) 
[ 33.445347][ T233] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 33.445561][ T233] ? do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 33.445821][ T233] do_tcp_getsockopt (net/ipv4/tcp.c:4631) 
[ 33.446064][ T233] ? __pfx_do_tcp_getsockopt (net/ipv4/tcp.c:4300) 
[ 33.446294][ T233] ? tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1737) 
[ 33.446567][ T233] ? release_sock (net/core/sock.c:3630) 
[ 33.446812][ T233] ? reacquire_held_locks (kernel/locking/lockdep.c:5350) 
[ 33.447083][ T233] ? release_sock (net/core/sock.c:3630) 
[ 33.447346][ T233] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 33.447593][ T233] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 33.447845][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 33.448111][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 33.448362][ T233] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 33.448637][ 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) 
[ 33.448906][ T233] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 33.449119][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 33.449422][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 33.449684][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 33.449922][ T233] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 33.450173][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 33.450428][ T233] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 33.450685][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 33.450979][ T233] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 33.451258][ T233] ? __might_fault (mm/memory.c:6705 mm/memory.c:6698) 
[ 33.451527][ T233] tcp_getsockopt (net/ipv4/tcp.c:4673 net/ipv4/tcp.c:4664) 
[ 33.451798][ T233] do_sock_getsockopt (net/socket.c:2396) 
[ 33.452074][ T233] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 33.452332][ T233] ? __pfx_do_sock_getsockopt (net/socket.c:2374) 
[ 33.452614][ T233] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 33.452825][ T233] __sys_getsockopt (./include/linux/file.h:35 net/socket.c:2428) 
[ 33.453087][ T233] ? __pfx___sys_getsockopt (net/socket.c:2415) 
[ 33.453353][ T233] ? __pfx_task_work_run (kernel/task_work.c:207) 
[ 33.453626][ T233] __x64_sys_getsockopt (net/socket.c:2432) 
[ 33.453881][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 33.454213][ T233] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 33.454480][ T233] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   33.454804][  T233] RIP: 0033:0x7f62ccc7c46e
[ 33.455079][ 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
[   33.455981][  T233] RSP: 002b:00007ffd9eaaeed8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
[   33.456382][  T233] RAX: ffffffffffffffda RBX: 00007ffd9eaaf190 RCX: 00007f62ccc7c46e
[   33.456772][  T233] RDX: 0000000000000029 RSI: 0000000000000006 RDI: 0000000000000009
[   33.457159][  T233] RBP: 00007ffd9eaaeef0 R08: 00007ffd9eaaeeec R09: 0000000000000064
[   33.457547][  T233] R10: 00007ffd9eaaeef0 R11: 0000000000000246 R12: 0000000000000009
[   33.457936][  T233] R13: 0000000000000064 R14: 0000000000000020 R15: 0000000000000064
| [   33.461383][  T233] 1 lock held by bench-lookups_i/233:
| [ 33.461663][ T233] #0: ffff88800511aa58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   33.462137][  T233]
| [   33.462137][  T233] stack backtrace:
[   33.462882][  T233] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   33.463432][  T233] Call Trace:
[   33.463632][  T233]  <TASK>
[ 33.463777][ T233] dump_stack_lvl (lib/dump_stack.c:123) 
[ 33.464048][ T233] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 33.464317][ T233] __tcp_ao_do_lookup.part.0 (net/ipv4/tcp_ao.c:208) 
[ 33.464623][ T233] tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1698) 
[ 33.464898][ T233] ? __pfx_tcp_ao_add_cmd (net/ipv4/tcp_ao.c:1597) 
[ 33.465162][ 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) 
[ 33.465434][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 33.465775][ T233] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 33.466050][ T233] ? do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 33.466309][ T233] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 33.466575][ T233] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 33.466860][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 33.467145][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 33.467410][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 33.467668][ T233] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 33.467930][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 33.468191][ T233] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 33.468453][ T233] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 33.468713][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 33.468984][ T233] do_sock_setsockopt (net/socket.c:2334) 
[ 33.469254][ T233] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 33.469525][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 33.469853][ T233] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 33.470063][ T233] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 33.470333][ T233] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 33.470601][ T233] ? __pfx_task_work_run (kernel/task_work.c:207) 
[ 33.470890][ T233] __x64_sys_setsockopt (net/socket.c:2363) 
[ 33.471153][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 33.471491][ T233] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 33.471773][ T233] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   33.472088][  T233] RIP: 0033:0x7f62ccc7c91e
[ 33.472348][ 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
[   33.473208][  T233] RSP: 002b:00007ffd9eaaf068 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   33.473582][  T233] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f62ccc7c91e
[   33.473956][  T233] RDX: 0000000000000026 RSI: 0000000000000006 RDI: 0000000000000009
[   33.474331][  T233] RBP: 0000000000000009 R08: 0000000000000120 R09: 0029383231736561
[   33.474698][  T233] R10: 00007ffd9eaaf070 R11: 0000000000000246 R12: 00007ffd9eaaf190
[   33.475075][  T233] R13: ffffffff00000000 R14: 0000000000000001 R15: 0000000000000200
| [   33.752035][  T240] 1 lock held by bench-lookups_i/240:
| [ 33.752194][ T240] #0: ffff888005119d18 (sk_lock-AF_INET){+.+.}-{0:0}, at: inet_stream_connect (net/ipv4/af_inet.c:748) 
| [   33.752506][  T240]
| [   33.752506][  T240] stack backtrace:
[   33.752982][  T240] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   33.753329][  T240] Call Trace:
[   33.753467][  T240]  <TASK>
[ 33.753554][ T240] dump_stack_lvl (lib/dump_stack.c:123) 
[ 33.753723][ T240] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 33.753904][ T240] tcp_ao_finish_connect (net/ipv4/tcp_ao.c:1183 (discriminator 7)) 
[ 33.754077][ T240] tcp_finish_connect (net/ipv4/tcp_input.c:6340) 
[ 33.754238][ T240] tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6576) 
[ 33.754475][ T240] ? 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) 
[ 33.754644][ T240] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 33.754797][ T240] ? __pfx_tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6455) 
[ 33.754999][ T240] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 33.755206][ T240] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 33.755363][ T240] ? 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)) 
[ 33.755497][ T240] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 33.755652][ T240] tcp_rcv_state_process (net/ipv4/tcp_input.c:6796) 
[ 33.755808][ T240] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 33.755981][ T240] ? __release_sock (./include/net/sock.h:1121 net/core/sock.c:3077) 
[ 33.756157][ T240] ? __pfx_tcp_rcv_state_process (net/ipv4/tcp_input.c:6751) 
[ 33.756359][ T240] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 33.756494][ T240] tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1945) 
[ 33.756651][ T240] __release_sock (./include/net/sock.h:1121 net/core/sock.c:3077) 
[ 33.756830][ T240] release_sock (net/core/sock.c:3633) 
[ 33.756987][ T240] inet_stream_connect (net/ipv4/af_inet.c:751) 
[ 33.757161][ T240] __sys_connect (net/socket.c:2071 net/socket.c:2088) 
[ 33.757319][ T240] ? __pfx___sys_connect (net/socket.c:2078) 
[ 33.757484][ T240] ? do_fcntl (fs/fcntl.c:473) 
[ 33.757627][ T240] ? __pfx_do_fcntl (fs/fcntl.c:443) 
[ 33.757784][ T240] ? __fget_files (fs/file.c:1009) 
[ 33.757966][ T240] __x64_sys_connect (net/socket.c:2095) 
[ 33.758120][ T240] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 33.758291][ T240] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   33.758516][  T240] RIP: 0033:0x7f62ccc7c40b
[ 33.758689][ T240] 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
[   33.759266][  T240] RSP: 002b:00007f62c7ffecf0 EFLAGS: 00000293 ORIG_RAX: 000000000000002a
[   33.759528][  T240] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00007f62ccc7c40b
[   33.759769][  T240] RDX: 0000000000000010 RSI: 00007f62c7ffed40 RDI: 000000000000000a
[   33.760028][  T240] RBP: 000000000000000a R08: 0000000000000000 R09: 00007f62cce17080
[   33.760294][  T240] R10: 00007f62ccb34598 R11: 0000000000000293 R12: 000000000040dab0
[   33.760553][  T240] R13: 0000000000000005 R14: 00007f62c7ffed40 R15: 00000000004143f8
| [   35.653142][  T233] 1 lock held by bench-lookups_i/233:
| [ 35.653324][ T233] #0: ffff88800511aa58 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_tcp_setsockopt (net/ipv4/tcp.c:3809) 
| [   35.653673][  T233]
| [   35.653673][  T233] stack backtrace:
[   35.654205][  T233] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   35.654591][  T233] Call Trace:
[   35.654713][  T233]  <TASK>
[ 35.654793][ T233] dump_stack_lvl (lib/dump_stack.c:123) 
[ 35.654955][ T233] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 35.655120][ T233] tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1905 (discriminator 7)) 
[ 35.655302][ T233] ? __pfx_tcp_ao_del_cmd (net/ipv4/tcp_ao.c:1813) 
[ 35.655460][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 35.655636][ T233] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 35.655790][ T233] do_tcp_setsockopt (net/ipv4/tcp.c:3943) 
[ 35.655945][ T233] ? __pfx_do_tcp_setsockopt (net/ipv4/tcp.c:3705) 
[ 35.656104][ T233] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 35.656276][ T233] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 35.656475][ T233] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 35.656635][ T233] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1006) 
[ 35.656791][ T233] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 35.656935][ T233] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 35.657088][ T233] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 35.657237][ T233] do_sock_setsockopt (net/socket.c:2334) 
[ 35.657413][ T233] ? __pfx_do_sock_setsockopt (net/socket.c:2303) 
[ 35.657583][ T233] ? fdget (fs/file.c:1121 fs/file.c:1128) 
[ 35.657731][ T233] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2359) 
[ 35.657896][ T233] ? __pfx___sys_setsockopt (net/socket.c:2347) 
[ 35.658059][ T233] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) 
[ 35.658266][ T233] ? trace_rcu_segcb_stats (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/cpumask.h:570 ./include/linux/cpumask.h:1117 ./include/trace/events/rcu.h:537) 
[ 35.658437][ T233] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) 
[ 35.658618][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 35.658847][ T233] __x64_sys_setsockopt (net/socket.c:2363) 
[ 35.659002][ T233] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 35.659206][ T233] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 35.659391][ T233] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   35.659588][  T233] RIP: 0033:0x7f62ccc7c91e
[ 35.659766][ 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
[   35.660325][  T233] RSP: 002b:00007ffd9eaaf188 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
[   35.660572][  T233] RAX: ffffffffffffffda RBX: 0000000000414380 RCX: 00007f62ccc7c91e
[   35.660820][  T233] RDX: 0000000000000027 RSI: 0000000000000006 RDI: 0000000000000009
[   35.661063][  T233] RBP: 0000000000402dc0 R08: 0000000000000090 R09: 00007f62cce17080
[   35.661301][  T233] R10: 00007ffd9eaaf200 R11: 0000000000000206 R12: 0000000000000009


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_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