======================================
| [ 39.974441][ T404] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   39.974615][  T404]
| [   39.974686][  T404]
| [   39.974686][  T404] stack backtrace:
[   39.975158][  T404] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   39.975464][  T404] Call Trace:
[   39.975575][  T404]  <TASK>
[ 39.975656][ T404] dump_stack_lvl (lib/dump_stack.c:117) 
[ 39.975800][ T404] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) 
[ 39.975946][ T404] ? 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) 
[ 39.976087][ T404] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) 
[ 39.976344][ T404] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 39.976482][ T404] ? __bfs (kernel/locking/lockdep.c:1787) 
[ 39.976588][ T404] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 39.976725][ T404] check_irq_usage (kernel/locking/lockdep.c:2871) 
[ 39.976948][ T404] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) 
[ 39.977087][ T404] ? __bfs (kernel/locking/lockdep.c:1787) 
[ 39.977191][ T404] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) 
[ 39.977330][ T404] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) 
[ 39.977475][ T404] ? check_noncircular (kernel/locking/lockdep.c:2172) 
[ 39.977615][ T404] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) 
[ 39.977753][ T404] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 39.977863][ T404] ? check_prev_add (kernel/locking/lockdep.c:3138) 
[ 39.978000][ T404] check_prev_add (kernel/locking/lockdep.c:3138) 
[ 39.978220][ T404] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 39.978358][ T404] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) 
[ 39.978497][ T404] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 39.978602][ T404] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 39.978741][ T404] ? 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) 
[ 39.978958][ T404] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 39.979068][ T404] __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 39.979210][ T404] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 39.979349][ T404] ? __get_task_comm (fs/exec.c:1234) 
[ 39.979578][ T404] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 39.979684][ T404] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 39.979828][ T404] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 39.979974][ T404] ? __get_task_comm (fs/exec.c:1234) 
[ 39.980121][ T404] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 39.980344][ T404] ? __get_task_comm (fs/exec.c:1234) 
[ 39.980483][ T404] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 39.980622][ T404] ? __get_task_comm (fs/exec.c:1234) 
[ 39.980761][ T404] __get_task_comm (fs/exec.c:1234) 
[ 39.980985][ T404] ref_tracker_alloc (lib/ref_tracker.c:217) 
[ 39.981133][ T404] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) 
[ 39.981271][ T404] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) 
[ 39.981416][ T404] ? netdev_get_by_index (net/core/dev.c:914) 
[ 39.981636][ T404] ? fib6_nh_init (net/ipv6/route.c:3541) 
[ 39.981776][ T404] ? ip6_route_info_create (net/ipv6/route.c:3808) 
[ 39.981918][ T404] ? addrconf_f6i_alloc (net/ipv6/route.c:4584) 
[ 39.982068][ T404] ? __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) 
[ 39.982209][ T404] ? addrconf_join_anycast (net/ipv6/addrconf.c:2264) 
[ 39.982427][ T404] ? dev_forward_change (./include/linux/list.h:373 net/ipv6/addrconf.c:833) 
[ 39.982565][ T404] ? addrconf_fixup_forwarding (net/ipv6/addrconf.c:854 net/ipv6/addrconf.c:898) 
[ 39.982739][ T404] ? addrconf_sysctl_forward (net/ipv6/addrconf.c:6329) 
[ 39.982876][ T404] ? proc_sys_call_handler (fs/proc/proc_sysctl.c:595) 
[ 39.983110][ T404] ? vfs_write (./include/linux/fs.h:2108 fs/read_write.c:497 fs/read_write.c:590) 
[ 39.983247][ T404] ? ksys_write (fs/read_write.c:643) 
[ 39.983387][ T404] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 39.983525][ T404] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 39.983702][ T404] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) 
[ 39.983841][ T404] netdev_get_by_index (net/core/dev.c:914) 
[ 39.984025][ T404] fib6_nh_init (net/ipv6/route.c:3541) 
[ 39.984168][ T404] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) 
[ 39.984425][ T404] ? __pfx_fib6_nh_init (net/ipv6/route.c:3522) 
[ 39.984564][ T404] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 39.984707][ T404] ? __kasan_kmalloc (mm/kasan/common.c:391) 
[ 39.984846][ T404] ? __kmalloc (mm/slub.c:3980) 
[ 39.985077][ T404] ? fib6_get_table (net/ipv6/ip6_fib.c:295) 
[ 39.985216][ T404] ip6_route_info_create (net/ipv6/route.c:3808) 
[ 39.985357][ T404] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 39.985498][ T404] ? __pfx_ip6_route_info_create (net/ipv6/route.c:3691) 
[ 39.985670][ T404] ? addrconf_f6i_alloc (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/l3mdev.h:138 net/ipv6/route.c:4564) 
[ 39.985809][ T404] addrconf_f6i_alloc (net/ipv6/route.c:4584) 
[ 39.985948][ T404] ? __pfx_addrconf_f6i_alloc (net/ipv6/route.c:4562) 
[ 39.986090][ T404] ? do_raw_write_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/qrwlock.h:98 kernel/locking/spinlock_debug.c:211) 
[ 39.986312][ T404] ? __pfx_do_raw_write_lock (kernel/locking/spinlock_debug.c:209) 
[ 39.986448][ T404] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 39.986590][ T404] __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) 
[ 39.986732][ T404] addrconf_join_anycast (net/ipv6/addrconf.c:2264) 
[ 39.986954][ T404] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 39.987062][ T404] ? __pfx_addrconf_join_anycast (net/ipv6/addrconf.c:2256) 
[ 39.987236][ T404] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 39.987409][ T404] dev_forward_change (./include/linux/list.h:373 net/ipv6/addrconf.c:833) 
[ 39.987551][ T404] ? __pfx_dev_forward_change (net/ipv6/addrconf.c:803) 
[ 39.987694][ T404] addrconf_fixup_forwarding (net/ipv6/addrconf.c:854 net/ipv6/addrconf.c:898) 
[ 39.987836][ T404] addrconf_sysctl_forward (net/ipv6/addrconf.c:6329) 
[ 39.987977][ T404] ? __pfx_addrconf_sysctl_forward (net/ipv6/addrconf.c:6312) 
[ 39.988234][ T404] ? __pfx_addrconf_sysctl_forward (net/ipv6/addrconf.c:6312) 
[ 39.988413][ T404] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 39.988552][ T404] ? __kmalloc_node (mm/slub.c:3974) 
[ 39.988691][ T404] ? proc_sys_call_handler (fs/proc/proc_sysctl.c:578) 
[ 39.988914][ T404] proc_sys_call_handler (fs/proc/proc_sysctl.c:595) 
[ 39.989060][ T404] ? __pfx_proc_sys_call_handler (fs/proc/proc_sysctl.c:550) 
[ 39.989233][ T404] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 39.989374][ T404] vfs_write (./include/linux/fs.h:2108 fs/read_write.c:497 fs/read_write.c:590) 
[ 39.989480][ T404] ? do_user_addr_fault (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 ./include/linux/mm.h:700 arch/x86/mm/fault.c:1364) 
[ 39.989704][ T404] ? __pfx_vfs_write (fs/read_write.c:571) 
[ 39.989843][ T404] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 39.989988][ T404] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 39.990130][ T404] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 39.990275][ T404] ksys_write (fs/read_write.c:643) 
[ 39.990380][ T404] ? __pfx_ksys_write (fs/read_write.c:633) 
[ 39.990519][ T404] ? do_user_addr_fault (./include/linux/rcupdate.h:815 ./include/linux/mm.h:702 arch/x86/mm/fault.c:1364) 
[ 39.990658][ T404] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 39.990799][ T404] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   39.990975][  T404] RIP: 0033:0x7fd27a7b0957
[ 39.991126][ T404] Code: 0b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
All code
========
   0:	0b 00                	or     (%rax),%eax
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b7                	jmp    0xffffffffffffffc7
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 01 00 00 00       	mov    $0x1,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	48 89 54 24 18       	mov    %rdx,0x18(%rsp)
  3c:	48                   	rex.W
  3d:	89                   	.byte 0x89
  3e:	74 24                	je     0x64

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	48 89 54 24 18       	mov    %rdx,0x18(%rsp)
  12:	48                   	rex.W
  13:	89                   	.byte 0x89
  14:	74 24                	je     0x3a
[   39.991626][  T404] RSP: 002b:00007ffd9ae6d6e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   39.991846][  T404] RAX: ffffffffffffffda RBX: 000055a33dcfa360 RCX: 00007fd27a7b0957
[   39.992056][  T404] RDX: 0000000000000002 RSI: 000055a33dcfa3a0 RDI: 0000000000000005
[   39.992266][  T404] RBP: 000055a33dcfc4d0 R08: 0000000000000003 R09: 0000000000000077
[   39.992478][  T404] R10: 000000000000006b R11: 0000000000000246 R12: 0000000000000002


Finger prints:
dump_stack_lvl:print_bad_irq_dependency:check_irq_usage:check_prev_add