======================================
| [ 52.137551][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   52.137883][    C2]
| [   52.137982][    C2]
| [   52.137982][    C2] stack backtrace:
[   52.138450][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   52.138951][    C2] Call Trace:
[   52.139078][    C2]  <IRQ>
[ 52.139172][ C2] dump_stack_lvl (lib/dump_stack.c:117) 
[ 52.139372][ C2] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 52.139679][ C2] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 52.139929][ C2] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 52.140094][ C2] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 52.140286][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 52.140560][ C2] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 52.140743][ C2] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 52.140908][ C2] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 52.141101][ C2] ? save_trace (kernel/locking/lockdep.c:586) 
[ 52.141377][ C2] mark_lock (kernel/locking/lockdep.c:4678) 
[ 52.141528][ C2] mark_usage (kernel/locking/lockdep.c:4567) 
[ 52.141659][ C2] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 52.141854][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) 
[ 52.142064][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 52.142374][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 52.142550][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 52.142813][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 52.142997][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 52.143207][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 52.143456][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 52.143623][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 52.144007][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 52.144206][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 52.144466][ C2] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 52.144842][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 52.145112][ C2] call_timer_fn (kernel/time/timer.c:1793) 
[ 52.145267][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 52.145445][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 52.145702][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 52.145868][ C2] ? 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) 
[ 52.146020][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 52.146173][ C2] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 52.146452][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 52.146750][ C2] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 52.146903][ 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) 
[ 52.147080][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 52.147350][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 52.147504][ C2] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 52.147681][ C2] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 52.147837][ C2] __do_softirq (kernel/softirq.c:554) 
[ 52.148017][ C2] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 52.148140][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   52.148307][    C2]  </IRQ>
[   52.148387][    C2]  <TASK>
[ 52.148488][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 52.148680][ C2] RIP: 0010:__orc_find (arch/x86/kernel/unwind_orc.c:80 arch/x86/kernel/unwind_orc.c:102) 
[ 52.148893][ C2] Code: 89 df 4c 39 e5 77 4e 4c 89 e2 48 29 ea 48 89 d6 48 c1 ea 3f 48 c1 fe 02 48 01 f2 48 d1 fa 48 8d 5c 95 00 48 89 da 48 c1 ea 03 <0f> b6 34 0a 48 89 da 83 e2 07 83 c2 03 40 38 f2 7c 05 40 84 f6 75
All code
========
   0:	89 df                	mov    %ebx,%edi
   2:	4c 39 e5             	cmp    %r12,%rbp
   5:	77 4e                	ja     0x55
   7:	4c 89 e2             	mov    %r12,%rdx
   a:	48 29 ea             	sub    %rbp,%rdx
   d:	48 89 d6             	mov    %rdx,%rsi
  10:	48 c1 ea 3f          	shr    $0x3f,%rdx
  14:	48 c1 fe 02          	sar    $0x2,%rsi
  18:	48 01 f2             	add    %rsi,%rdx
  1b:	48 d1 fa             	sar    %rdx
  1e:	48 8d 5c 95 00       	lea    0x0(%rbp,%rdx,4),%rbx
  23:	48 89 da             	mov    %rbx,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
  2a:*	0f b6 34 0a          	movzbl (%rdx,%rcx,1),%esi		<-- trapping instruction
  2e:	48 89 da             	mov    %rbx,%rdx
  31:	83 e2 07             	and    $0x7,%edx
  34:	83 c2 03             	add    $0x3,%edx
  37:	40 38 f2             	cmp    %sil,%dl
  3a:	7c 05                	jl     0x41
  3c:	40 84 f6             	test   %sil,%sil
  3f:	75                   	.byte 0x75

Code starting with the faulting instruction
===========================================
   0:	0f b6 34 0a          	movzbl (%rdx,%rcx,1),%esi
   4:	48 89 da             	mov    %rbx,%rdx
   7:	83 e2 07             	and    $0x7,%edx
   a:	83 c2 03             	add    $0x3,%edx
   d:	40 38 f2             	cmp    %sil,%dl
  10:	7c 05                	jl     0x17
  12:	40 84 f6             	test   %sil,%sil
  15:	75                   	.byte 0x75
[   52.149571][    C2] RSP: 0018:ffffc9000056f4b8 EFLAGS: 00000a02
[   52.149792][    C2] RAX: ffffffff8ac995e8 RBX: ffffffff8a839b38 RCX: dffffc0000000000
[   52.150050][    C2] RDX: 1ffffffff1507367 RSI: 0000000000000002 RDI: ffffffff8a839b34
[   52.150532][    C2] RBP: ffffffff8a839b34 R08: ffffc9000056f638 R09: 1ffff920000adea8
[   52.150793][    C2] R10: ffffc9000056f5f8 R11: ffffc9000056f639 R12: ffffffff8a839b3c
[   52.151058][    C2] R13: ffffffff88a00125 R14: ffffffff8a839b34 R15: ffffffff8a839b34
[ 52.151418][ C2] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120) 
[ 52.151631][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 52.151793][ C2] unwind_next_frame (arch/x86/kernel/unwind_orc.c:495) 
[ 52.151945][ C2] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 52.152267][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 52.152444][ C2] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 52.152647][ C2] ? kernel_text_address (kernel/extable.c:99) 
[ 52.152829][ C2] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 52.153020][ C2] arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 52.153199][ C2] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 52.153399][ C2] stack_trace_save (kernel/stacktrace.c:123) 
[ 52.153574][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 52.153725][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 52.153903][ C2] set_track_prepare (mm/slub.c:886) 
[ 52.154064][ C2] ? kasan_quarantine_reduce (./include/linux/srcu.h:285 mm/kasan/quarantine.c:287) 
[ 52.154228][ C2] ? __kasan_slab_alloc (mm/kasan/common.c:322) 
[ 52.154509][ C2] ? kmem_cache_alloc_node (./include/linux/kasan.h:201 mm/slub.c:3798 mm/slub.c:3845 mm/slub.c:3888) 
[ 52.154692][ C2] ? kmalloc_reserve (net/core/skbuff.c:580) 
[ 52.154845][ C2] ? __alloc_skb (net/core/skbuff.c:668) 
[ 52.154997][ C2] ? alloc_skb_with_frags (./include/linux/skbuff.h:1313 net/core/skbuff.c:6477) 
[ 52.155275][ C2] ? sock_alloc_send_pskb (net/core/sock.c:2796) 
[ 52.155450][ C2] ? packet_snd (net/packet/af_packet.c:2930 net/packet/af_packet.c:3024) 
[ 52.155610][ C2] ? __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) 
[ 52.155789][ C2] ? __x64_sys_sendto (net/socket.c:2199) 
[ 52.155946][ C2] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 52.156106][ C2] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 52.156314][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 52.156487][ C2] free_to_partial_list (mm/slub.c:4026) 
[ 52.156642][ C2] ? qlist_free_all (mm/kasan/quarantine.c:163 mm/kasan/quarantine.c:179) 
[ 52.156799][ C2] qlist_free_all (mm/kasan/quarantine.c:174) 
[ 52.156985][ C2] kasan_quarantine_reduce (./include/linux/srcu.h:285 mm/kasan/quarantine.c:287) 
[ 52.157140][ C2] __kasan_slab_alloc (mm/kasan/common.c:322) 
[ 52.157348][ C2] kmem_cache_alloc_node (./include/linux/kasan.h:201 mm/slub.c:3798 mm/slub.c:3845 mm/slub.c:3888) 
[ 52.157623][ C2] ? kmalloc_reserve (net/core/skbuff.c:577) 
[ 52.157797][ C2] kmalloc_reserve (net/core/skbuff.c:580) 
[ 52.157975][ C2] __alloc_skb (net/core/skbuff.c:668) 
[ 52.158143][ C2] ? __pfx___alloc_skb (net/core/skbuff.c:641) 
[ 52.158427][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 52.158580][ C2] ? dev_queue_xmit_nit (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:2332) 
[ 52.158747][ C2] ? 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) 
[ 52.158928][ C2] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 52.159142][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 52.159339][ C2] alloc_skb_with_frags (./include/linux/skbuff.h:1313 net/core/skbuff.c:6477) 
[ 52.159503][ C2] sock_alloc_send_pskb (net/core/sock.c:2796) 
[ 52.159656][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 52.159841][ C2] ? __pfx_sock_alloc_send_pskb (net/core/sock.c:2767) 
[ 52.160091][ C2] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) 
[ 52.160249][ C2] packet_snd (net/packet/af_packet.c:2930 net/packet/af_packet.c:3024) 
[ 52.160406][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 52.160557][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 52.160804][ C2] ? __pfx_packet_snd (net/packet/af_packet.c:2944) 
[ 52.160959][ C2] ? __might_fault (mm/memory.c:6216 mm/memory.c:6209) 
[ 52.161146][ C2] ? trace_raw_output_mmap_lock_acquire_returned (./include/trace/events/mmap_lock.h:52 (discriminator 2)) 
[ 52.161378][ C2] ? __might_fault (mm/memory.c:6216 mm/memory.c:6209) 
[ 52.161678][ C2] __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) 
[ 52.161887][ C2] ? __pfx___sys_sendto (net/socket.c:2161) 
[ 52.162091][ C2] ? net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886) 
[ 52.162285][ C2] ? sock_ioctl (net/socket.c:1344) 
[ 52.162599][ C2] __x64_sys_sendto (net/socket.c:2199) 
[ 52.162791][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 52.163027][ C2] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 52.163217][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   52.163621][    C2] RIP: 0033:0x7f978edcc85a
[ 52.163827][ 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
[   52.164610][    C2] RSP: 002b:00007ffdc855d5b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   52.164887][    C2] RAX: ffffffffffffffda RBX: 0000000000ab19d0 RCX: 00007f978edcc85a
[   52.165177][    C2] RDX: 0000000000001f6a RSI: 0000000000ab58e2 RDI: 0000000000000005
[   52.165758][    C2] RBP: 0000000000ab58e2 R08: 00007ffdc855d5c0 R09: 0000000000000014
[   52.166165][    C2] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage