======================================
| [ 50.013651][ C1] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   50.013842][    C1]
| [   50.013918][    C1]
| [   50.013918][    C1] stack backtrace:
[   50.014424][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   50.014748][    C1] Call Trace:
[   50.014862][    C1]  <IRQ>
[ 50.015029][ C1] dump_stack_lvl (lib/dump_stack.c:117) 
[ 50.015179][ C1] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 50.015366][ C1] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 50.015559][ C1] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 50.015804][ C1] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 50.015956][ C1] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 50.016115][ C1] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 50.016269][ C1] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 50.016518][ C1] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 50.016666][ C1] ? add_chain_cache (kernel/locking/lockdep.c:3730) 
[ 50.016815][ C1] ? save_trace (kernel/locking/lockdep.c:586) 
[ 50.016966][ C1] mark_lock (kernel/locking/lockdep.c:4678) 
[ 50.017080][ C1] mark_usage (kernel/locking/lockdep.c:4567) 
[ 50.017292][ C1] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 50.017441][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 50.017590][ C1] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 50.017849][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 50.018094][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 50.018319][ C1] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 50.018465][ C1] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 50.018617][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 50.018928][ C1] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 50.019075][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 50.019387][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 50.019638][ C1] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 50.019859][ C1] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge
[ 50.020080][ C1] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 50.020340][ C1] call_timer_fn (kernel/time/timer.c:1793) 
[ 50.020581][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 50.020737][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 50.020980][ C1] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 50.021125][ C1] ? 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) 
[ 50.021366][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 50.021607][ C1] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 50.021756][ C1] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge
[ 50.022113][ C1] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 50.022450][ C1] ? 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) 
[ 50.022595][ C1] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 50.022839][ C1] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 50.023079][ C1] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 50.023327][ C1] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 50.023472][ C1] __do_softirq (kernel/softirq.c:554) 
[ 50.023619][ C1] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 50.023736][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   50.023983][    C1]  </IRQ>
[   50.024060][    C1]  <TASK>
[ 50.024135][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 50.024416][ C1] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 50.024718][ C1] Code: 10 e8 21 49 9b fd 48 89 ef e8 59 b9 9b fd 81 e3 00 02 00 00 75 1d 9c 58 f6 c4 02 75 29 48 85 db 74 01 fb 65 ff 0d 05 bf cf 6b <74> 0e 5b 5d c3 cc cc cc cc e8 4f b3 be fd eb dc 0f 1f 44 00 00 5b
All code
========
   0:	10 e8                	adc    %ch,%al
   2:	21 49 9b             	and    %ecx,-0x65(%rcx)
   5:	fd                   	std
   6:	48 89 ef             	mov    %rbp,%rdi
   9:	e8 59 b9 9b fd       	call   0xfffffffffd9bb967
   e:	81 e3 00 02 00 00    	and    $0x200,%ebx
  14:	75 1d                	jne    0x33
  16:	9c                   	pushf
  17:	58                   	pop    %rax
  18:	f6 c4 02             	test   $0x2,%ah
  1b:	75 29                	jne    0x46
  1d:	48 85 db             	test   %rbx,%rbx
  20:	74 01                	je     0x23
  22:	fb                   	sti
  23:	65 ff 0d 05 bf cf 6b 	decl   %gs:0x6bcfbf05(%rip)        # 0x6bcfbf2f
  2a:*	74 0e                	je     0x3a		<-- trapping instruction
  2c:	5b                   	pop    %rbx
  2d:	5d                   	pop    %rbp
  2e:	c3                   	ret
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	cc                   	int3
  32:	cc                   	int3
  33:	e8 4f b3 be fd       	call   0xfffffffffdbeb387
  38:	eb dc                	jmp    0x16
  3a:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  3f:	5b                   	pop    %rbx

Code starting with the faulting instruction
===========================================
   0:	74 0e                	je     0x10
   2:	5b                   	pop    %rbx
   3:	5d                   	pop    %rbp
   4:	c3                   	ret
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	cc                   	int3
   9:	e8 4f b3 be fd       	call   0xfffffffffdbeb35d
   e:	eb dc                	jmp    0xffffffffffffffec
  10:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  15:	5b                   	pop    %rbx
[   50.025245][    C1] RSP: 0018:ffffc9000055f808 EFLAGS: 00000286
[   50.025437][    C1] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff2ea5955
[   50.025756][    C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff94340911
[   50.025979][    C1] RBP: ffff888001041080 R08: 0000000000000001 R09: fffffbfff2ea38a9
[   50.026304][    C1] R10: ffffffff9751c54f R11: 0000000000001000 R12: ffff88800598d8d8
[   50.026533][    C1] R13: 0000000000000000 R14: ffffc9000055f858 R15: ffff888005ee1000
[ 50.026763][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 50.026953][ C1] qlist_free_all (mm/kasan/quarantine.c:174) 
[ 50.027106][ C1] kasan_quarantine_reduce (./include/linux/srcu.h:285 mm/kasan/quarantine.c:287) 
[ 50.027256][ C1] __kasan_slab_alloc (mm/kasan/common.c:322) 
[ 50.027405][ C1] kmem_cache_alloc_node (./include/linux/kasan.h:201 mm/slub.c:3798 mm/slub.c:3845 mm/slub.c:3888) 
[ 50.027552][ C1] ? kmalloc_reserve (net/core/skbuff.c:577) 
[ 50.027814][ C1] kmalloc_reserve (net/core/skbuff.c:580) 
[ 50.027973][ C1] __alloc_skb (net/core/skbuff.c:668) 
[ 50.028121][ C1] ? __pfx___alloc_skb (net/core/skbuff.c:641) 
[ 50.028267][ C1] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 50.028416][ C1] ? dev_queue_xmit_nit (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:2332) 
[ 50.028566][ C1] ? 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) 
[ 50.028714][ C1] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 50.028829][ C1] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 50.028977][ C1] alloc_skb_with_frags (./include/linux/skbuff.h:1313 net/core/skbuff.c:6477) 
[ 50.029129][ C1] sock_alloc_send_pskb (net/core/sock.c:2796) 
[ 50.029278][ C1] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 50.029423][ C1] ? __pfx_sock_alloc_send_pskb (net/core/sock.c:2767) 
[ 50.029571][ C1] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) 
[ 50.029818][ C1] packet_snd (net/packet/af_packet.c:2930 net/packet/af_packet.c:3024) 
[ 50.029968][ C1] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 50.030116][ C1] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 50.030263][ C1] ? __pfx_packet_snd (net/packet/af_packet.c:2944) 
[ 50.030416][ C1] ? __might_fault (mm/memory.c:6216 mm/memory.c:6209) 
[ 50.030563][ C1] ? trace_raw_output_mmap_lock_acquire_returned (./include/trace/events/mmap_lock.h:52 (discriminator 2)) 
[ 50.030791][ C1] ? __might_fault (mm/memory.c:6216 mm/memory.c:6209) 
[ 50.030940][ C1] __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) 
[ 50.031270][ C1] ? __pfx___sys_sendto (net/socket.c:2161) 
[ 50.031420][ C1] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 50.031570][ C1] ? sock_ioctl (net/socket.c:1344) 
[ 50.031716][ C1] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:316) 
[ 50.031908][ C1] __x64_sys_sendto (net/socket.c:2199) 
[ 50.032052][ C1] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 50.032234][ C1] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 50.032387][ C1] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   50.032667][    C1] RIP: 0033:0x7f7c3be4a85a
[ 50.032825][ C1] 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
[   50.033552][    C1] RSP: 002b:00007ffd41327568 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   50.033781][    C1] RAX: ffffffffffffffda RBX: 000000003c53f9d0 RCX: 00007f7c3be4a85a
[   50.034002][    C1] RDX: 0000000000001f6a RSI: 000000003c5438e2 RDI: 0000000000000005
[   50.034219][    C1] RBP: 000000003c5438e2 R08: 00007ffd41327570 R09: 0000000000000014
[   50.034441][    C1] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage