======================================
| [ 50.522705][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   50.522914][    C2]
| [   50.522997][    C2]
| [   50.522997][    C2] stack backtrace:
[   50.523535][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   50.523898][    C2] Call Trace:
[   50.524108][    C2]  <IRQ>
[ 50.524196][ C2] dump_stack_lvl (lib/dump_stack.c:117) 
[ 50.524365][ C2] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 50.524584][ C2] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 50.524790][ C2] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 50.525044][ C2] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 50.525211][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 50.525378][ C2] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 50.525543][ C2] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 50.525788][ C2] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 50.525954][ C2] ? add_chain_cache (kernel/locking/lockdep.c:3730) 
[ 50.526120][ C2] ? save_trace (kernel/locking/lockdep.c:586) 
[ 50.526288][ C2] mark_lock (kernel/locking/lockdep.c:4678) 
[ 50.526504][ C2] mark_usage (kernel/locking/lockdep.c:4567) 
[ 50.526634][ C2] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 50.526801][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 50.526966][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 50.527330][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 50.527495][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 50.527740][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 50.527904][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 50.528157][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 50.528398][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 50.528562][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 50.528806][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 50.529051][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 50.529292][ C2] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 50.529533][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 50.529900][ C2] call_timer_fn (kernel/time/timer.c:1793) 
[ 50.530068][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 50.530255][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 50.530420][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 50.530585][ C2] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 50.530797][ C2] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 50.530962][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 50.531253][ C2] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 50.531423][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 50.531673][ 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) 
[ 50.531836][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 50.532001][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 50.532165][ C2] ? timer_expire_remote (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 50.532414][ C2] timer_expire_remote (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 50.532582][ 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) 
[ 50.532747][ C2] ? __pfx_tmigr_handle_remote_cpu (kernel/time/timer_migration.c:869) 
[ 50.532961][ C2] tmigr_handle_remote_up (kernel/time/timer_migration.c:1003) 
[ 50.533207][ C2] tmigr_handle_remote (kernel/time/timer_migration.c:488 kernel/time/timer_migration.c:1061) 
[ 50.533372][ C2] ? ktime_get (kernel/time/timekeeping.c:195 (discriminator 4) kernel/time/timekeeping.c:289 (discriminator 4) kernel/time/timekeeping.c:388 (discriminator 4) kernel/time/timekeeping.c:848 (discriminator 4)) 
[ 50.533496][ C2] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) 
[ 50.533673][ C2] ? hrtimer_interrupt (kernel/time/hrtimer.c:1831) 
[ 50.533920][ C2] __do_softirq (kernel/softirq.c:554) 
[ 50.534084][ C2] ? __dev_queue_xmit (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:849 net/core/dev.c:4399) 
[ 50.534255][ C2] do_softirq (kernel/softirq.c:455 kernel/softirq.c:442) 
[   50.534382][    C2]  </IRQ>
[   50.534467][    C2]  <TASK>
[ 50.534551][ C2] __local_bh_enable_ip (kernel/softirq.c:382) 
[ 50.534800][ C2] ? __dev_queue_xmit (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:849 net/core/dev.c:4399) 
[ 50.534963][ C2] __dev_queue_xmit (net/core/dev.c:4400) 
[ 50.535130][ C2] ? packet_parse_headers (./include/linux/skbuff.h:3028 net/packet/af_packet.c:1944) 
[ 50.535302][ C2] ? packet_parse_headers (./include/linux/skbuff.h:3028 net/packet/af_packet.c:1944) 
[ 50.535633][ C2] ? copy_page_from_iter (lib/iov_iter.c:424 lib/iov_iter.c:411) 
[ 50.535808][ C2] ? __pfx___dev_queue_xmit (net/core/dev.c:4281) 
[ 50.535975][ C2] packet_snd (net/packet/af_packet.c:3081) 
[ 50.536145][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 50.536389][ C2] ? __pfx_packet_snd (net/packet/af_packet.c:2944) 
[ 50.536554][ C2] ? __might_fault (mm/memory.c:6216 mm/memory.c:6209) 
[ 50.536719][ C2] ? trace_raw_output_mmap_lock_acquire_returned (./include/trace/events/mmap_lock.h:52 (discriminator 2)) 
[ 50.536963][ C2] ? __might_fault (mm/memory.c:6216 mm/memory.c:6209) 
[ 50.537212][ C2] __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) 
[ 50.537382][ C2] ? __pfx___sys_sendto (net/socket.c:2161) 
[ 50.537548][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 50.537714][ C2] ? sock_ioctl (net/socket.c:1344) 
[ 50.537963][ C2] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:316) 
[ 50.538168][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) 
[ 50.538378][ C2] __x64_sys_sendto (net/socket.c:2199) 
[ 50.538541][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 50.538832][ C2] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 50.538998][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   50.539203][    C2] RIP: 0033:0x7fc9b2cfe85a
[ 50.539376][ 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
[   50.540057][    C2] RSP: 002b:00007ffc51265a58 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   50.540425][    C2] RAX: ffffffffffffffda RBX: 000000003fe079d0 RCX: 00007fc9b2cfe85a
[   50.540675][    C2] RDX: 0000000000001f6a RSI: 000000003fe0b8e2 RDI: 0000000000000005
[   50.540926][    C2] RBP: 000000003fe0b8e2 R08: 00007ffc51265a60 R09: 0000000000000014
[   50.541258][    C2] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage