======================================
| [ 53.090108][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   53.090387][    C2]
| [   53.090460][    C2]
| [   53.090460][    C2] stack backtrace:
[   53.090867][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   53.091312][    C2] Call Trace:
[   53.091430][    C2]  <IRQ>
[ 53.091516][ C2] dump_stack_lvl (lib/dump_stack.c:117) 
[ 53.091675][ C2] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 53.091953][ C2] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 53.092147][ C2] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 53.092302][ C2] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 53.092545][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 53.092708][ C2] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 53.092863][ C2] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 53.093017][ C2] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 53.093177][ C2] ? add_chain_cache (kernel/locking/lockdep.c:3730) 
[ 53.093419][ C2] ? save_trace (kernel/locking/lockdep.c:586) 
[ 53.093575][ C2] mark_lock (kernel/locking/lockdep.c:4678) 
[ 53.093692][ C2] mark_usage (kernel/locking/lockdep.c:4567) 
[ 53.093809][ C2] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 53.094053][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 53.094213][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 53.094486][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 53.094642][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 53.095055][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 53.095198][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 53.095344][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 53.095563][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 53.095792][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 53.096005][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 53.096150][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 53.096380][ C2] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 53.096684][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 53.096936][ C2] call_timer_fn (kernel/time/timer.c:1793) 
[ 53.097083][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 53.097340][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 53.097486][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 53.097631][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 53.097781][ C2] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 53.098029][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 53.098324][ C2] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 53.098478][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 53.098641][ C2] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:115 ./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) 
[ 53.098886][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 53.099044][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 53.099201][ C2] ? timer_expire_remote (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 53.099356][ C2] timer_expire_remote (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 53.099609][ C2] tmigr_handle_remote_cpu (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:67 ./arch/x86/include/asm/irqflags.h:127 kernel/time/timer_migration.c:925) 
[ 53.099772][ C2] ? __pfx_tmigr_handle_remote_cpu (kernel/time/timer_migration.c:869) 
[ 53.099965][ C2] ? timerqueue_del (lib/timerqueue.c:58) 
[ 53.100144][ C2] tmigr_handle_remote_up (kernel/time/timer_migration.c:1003) 
[ 53.100391][ C2] tmigr_handle_remote (kernel/time/timer_migration.c:488 kernel/time/timer_migration.c:1061) 
[ 53.100547][ C2] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:115 ./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) 
[ 53.100701][ C2] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) 
[ 53.100853][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 53.101009][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) 
[ 53.101306][ C2] __do_softirq (kernel/softirq.c:554) 
[ 53.101467][ C2] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 53.101583][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   53.101738][    C2]  </IRQ>
[   53.101909][    C2]  <TASK>
[ 53.101988][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 53.102179][ C2] RIP: 0010:lock_is_held_type (kernel/locking/lockdep.c:5810) 
[ 53.102339][ C2] Code: c7 c0 9e 0b a5 e8 d0 68 88 fd 90 0f 0b 90 90 eb e2 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 41 57 41 56 41 55 41 bd ff ff ff ff 41 54 55 53 48 83
All code
========
   0:	c7 c0 9e 0b a5 e8    	mov    $0xe8a50b9e,%eax
   6:	d0 68 88             	shrb   -0x78(%rax)
   9:	fd                   	std
   a:	90                   	nop
   b:	0f 0b                	ud2
   d:	90                   	nop
   e:	90                   	nop
   f:	eb e2                	jmp    0xfffffffffffffff3
  11:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  18:	00 00 
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	90                   	nop
  20:	90                   	nop
  21:	90                   	nop
  22:	90                   	nop
  23:	90                   	nop
  24:	90                   	nop
  25:	90                   	nop
  26:	90                   	nop
  27:	90                   	nop
  28:	90                   	nop
  29:	90                   	nop
  2a:*	f3 0f 1e fa          	endbr64		<-- trapping instruction
  2e:	41 57                	push   %r15
  30:	41 56                	push   %r14
  32:	41 55                	push   %r13
  34:	41 bd ff ff ff ff    	mov    $0xffffffff,%r13d
  3a:	41 54                	push   %r12
  3c:	55                   	push   %rbp
  3d:	53                   	push   %rbx
  3e:	48                   	rex.W
  3f:	83                   	.byte 0x83

Code starting with the faulting instruction
===========================================
   0:	f3 0f 1e fa          	endbr64
   4:	41 57                	push   %r15
   6:	41 56                	push   %r14
   8:	41 55                	push   %r13
   a:	41 bd ff ff ff ff    	mov    $0xffffffff,%r13d
  10:	41 54                	push   %r12
  12:	55                   	push   %rbp
  13:	53                   	push   %rbx
  14:	48                   	rex.W
  15:	83                   	.byte 0x83
[   53.103002][    C2] RSP: 0018:ffffc9000054f9b8 EFLAGS: 00000202
[   53.103201][    C2] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000001
[   53.103536][    C2] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffffa5f52220
[   53.103774][    C2] RBP: ffffffffa522e860 R08: 1ffff920000a9f4e R09: 0000000000000000
[   53.104006][    C2] R10: ffff88800591d770 R11: ffff88800591d700 R12: 0000000000000103
[   53.104353][    C2] R13: 0000000000000001 R14: ffff888006c49940 R15: 0000000000000000
[ 53.104589][ C2] __might_resched (kernel/sched/core.c:10159) 
[ 53.104750][ C2] __might_fault (mm/memory.c:6215) 
[ 53.104904][ C2] _copy_from_iter (lib/iov_iter.c:259) 
[ 53.105061][ C2] ? skb_set_owner_w (./arch/x86/include/asm/atomic.h:97 ./include/linux/atomic/atomic-arch-fallback.h:749 ./include/linux/atomic/atomic-instrumented.h:253 ./include/linux/refcount.h:184 ./include/linux/refcount.h:213 net/core/sock.c:2523) 
[ 53.105218][ C2] ? __pfx__copy_from_iter (lib/iov_iter.c:254) 
[ 53.105374][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 53.105535][ C2] ? __pfx_sock_alloc_send_pskb (net/core/sock.c:2767) 
[ 53.105781][ C2] skb_copy_datagram_from_iter (net/core/datagram.c:553) 
[ 53.105936][ C2] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) 
[ 53.106093][ C2] packet_snd (net/packet/af_packet.c:3044) 
[ 53.106252][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 53.106498][ C2] ? __pfx_packet_snd (net/packet/af_packet.c:2944) 
[ 53.106659][ C2] ? __might_fault (mm/memory.c:6216 mm/memory.c:6209) 
[ 53.106825][ C2] ? trace_raw_output_mmap_lock_acquire_returned (./include/trace/events/mmap_lock.h:52 (discriminator 2)) 
[ 53.107068][ C2] ? __might_fault (mm/memory.c:6216 mm/memory.c:6209) 
[ 53.107438][ C2] __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) 
[ 53.107606][ C2] ? __pfx___sys_sendto (net/socket.c:2161) 
[ 53.107749][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 53.107901][ C2] ? sock_ioctl (net/socket.c:1344) 
[ 53.108049][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 53.108264][ C2] __x64_sys_sendto (net/socket.c:2199) 
[ 53.108418][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 53.108616][ C2] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 53.108858][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   53.109050][    C2] RIP: 0033:0x7f159f27485a
[ 53.109214][ C2] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89
All code
========
   0:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   4:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   b:	eb b8                	jmp    0xffffffffffffffc5
   d:	0f 1f 00             	nopl   (%rax)
  10:	f3 0f 1e fa          	endbr64
  14:	41 89 ca             	mov    %ecx,%r10d
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 15                	jne    0x38
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 7e                	ja     0xb0
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	41 54                	push   %r12
  3a:	48 83 ec 30          	sub    $0x30,%rsp
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 7e                	ja     0x86
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	41 54                	push   %r12
  10:	48 83 ec 30          	sub    $0x30,%rsp
  14:	44                   	rex.R
  15:	89                   	.byte 0x89
[   53.109860][    C2] RSP: 002b:00007fff225f70d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   53.110118][    C2] RAX: ffffffffffffffda RBX: 00000000286be9d0 RCX: 00007f159f27485a
[   53.110428][    C2] RDX: 0000000000001f6a RSI: 00000000286c28e2 RDI: 0000000000000005
[   53.110640][    C2] RBP: 00000000286c28e2 R08: 00007fff225f70e0 R09: 0000000000000014
[   53.110852][    C2] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage