======================================
| [ 38.986746][ T376] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   38.986927][  T376]
| [   38.987084][  T376]
| [   38.987084][  T376] stack backtrace:
[   38.987481][  T376] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   38.987890][  T376] Call Trace:
[   38.988001][  T376]  <TASK>
[ 38.988078][ T376] dump_stack_lvl (lib/dump_stack.c:117) 
[ 38.988232][ T376] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) 
[ 38.988377][ T376] ? 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) 
[ 38.988522][ T376] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) 
[ 38.988699][ T376] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 38.988842][ T376] ? __bfs (kernel/locking/lockdep.c:1787) 
[ 38.988947][ T376] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 38.989175][ T376] check_irq_usage (kernel/locking/lockdep.c:2871) 
[ 38.989321][ T376] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) 
[ 38.989473][ T376] ? __bfs (kernel/locking/lockdep.c:1787) 
[ 38.989583][ T376] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) 
[ 38.989818][ T376] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) 
[ 38.989960][ T376] ? check_noncircular (kernel/locking/lockdep.c:2172) 
[ 38.990106][ T376] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) 
[ 38.990247][ T376] ? check_prev_add (kernel/locking/lockdep.c:3138) 
[ 38.990402][ T376] check_prev_add (kernel/locking/lockdep.c:3138) 
[ 38.990554][ T376] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 38.990701][ T376] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) 
[ 38.990854][ T376] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 38.990961][ T376] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 38.991180][ T376] ? 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) 
[ 38.991316][ T376] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 38.991459][ T376] __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 38.991602][ T376] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 38.991742][ T376] ? __get_task_comm (fs/exec.c:1234) 
[ 38.991978][ T376] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 38.992093][ T376] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 38.992231][ T376] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 38.992376][ T376] ? __get_task_comm (fs/exec.c:1234) 
[ 38.992605][ T376] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 38.992752][ T376] ? __get_task_comm (fs/exec.c:1234) 
[ 38.992889][ T376] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 38.993027][ T376] ? __get_task_comm (fs/exec.c:1234) 
[ 38.993257][ T376] __get_task_comm (fs/exec.c:1234) 
[ 38.993401][ T376] ref_tracker_alloc (lib/ref_tracker.c:217) 
[ 38.993544][ T376] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) 
[ 38.993683][ T376] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) 
[ 38.993832][ T376] ? netdev_get_by_index (net/core/dev.c:914) 
[ 38.994065][ T376] ? fib6_nh_init (net/ipv6/route.c:3541) 
[ 38.994206][ T376] ? ip6_route_info_create (net/ipv6/route.c:3808) 
[ 38.994344][ T376] ? addrconf_f6i_alloc (net/ipv6/route.c:4584) 
[ 38.994481][ T376] ? __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) 
[ 38.994717][ T376] ? addrconf_join_anycast (net/ipv6/addrconf.c:2264) 
[ 38.994857][ T376] ? dev_forward_change (./include/linux/list.h:373 net/ipv6/addrconf.c:833) 
[ 38.994998][ T376] ? addrconf_fixup_forwarding (net/ipv6/addrconf.c:854 net/ipv6/addrconf.c:898) 
[ 38.995169][ T376] ? addrconf_sysctl_forward (net/ipv6/addrconf.c:6329) 
[ 38.995399][ T376] ? proc_sys_call_handler (fs/proc/proc_sysctl.c:595) 
[ 38.995548][ T376] ? vfs_write (./include/linux/fs.h:2108 fs/read_write.c:497 fs/read_write.c:590) 
[ 38.995692][ T376] ? ksys_write (fs/read_write.c:643) 
[ 38.995839][ T376] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 38.996068][ T376] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 38.996247][ T376] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) 
[ 38.996389][ T376] netdev_get_by_index (net/core/dev.c:914) 
[ 38.996531][ T376] fib6_nh_init (net/ipv6/route.c:3541) 
[ 38.996759][ T376] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) 
[ 38.996932][ T376] ? __pfx_fib6_nh_init (net/ipv6/route.c:3522) 
[ 38.997073][ T376] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 38.997218][ T376] ? __kasan_kmalloc (mm/kasan/common.c:391) 
[ 38.997369][ T376] ? __kmalloc (mm/slub.c:3980) 
[ 38.997516][ T376] ? fib6_get_table (net/ipv6/ip6_fib.c:295) 
[ 38.997663][ T376] ip6_route_info_create (net/ipv6/route.c:3808) 
[ 38.997799][ T376] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 38.998029][ T376] ? __pfx_ip6_route_info_create (net/ipv6/route.c:3691) 
[ 38.998209][ T376] ? addrconf_f6i_alloc (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/l3mdev.h:138 net/ipv6/route.c:4564) 
[ 38.998351][ T376] addrconf_f6i_alloc (net/ipv6/route.c:4584) 
[ 38.998496][ T376] ? __pfx_addrconf_f6i_alloc (net/ipv6/route.c:4562) 
[ 38.998818][ T376] ? 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) 
[ 38.998960][ T376] ? __pfx_do_raw_write_lock (kernel/locking/spinlock_debug.c:209) 
[ 38.999095][ T376] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 38.999236][ T376] __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) 
[ 38.999387][ T376] addrconf_join_anycast (net/ipv6/addrconf.c:2264) 
[ 38.999533][ T376] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 38.999640][ T376] ? __pfx_addrconf_join_anycast (net/ipv6/addrconf.c:2256) 
[ 38.999812][ T376] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 38.999991][ T376] dev_forward_change (./include/linux/list.h:373 net/ipv6/addrconf.c:833) 
[ 39.000221][ T376] ? __pfx_dev_forward_change (net/ipv6/addrconf.c:803) 
[ 39.000367][ T376] addrconf_fixup_forwarding (net/ipv6/addrconf.c:854 net/ipv6/addrconf.c:898) 
[ 39.000509][ T376] addrconf_sysctl_forward (net/ipv6/addrconf.c:6329) 
[ 39.000655][ T376] ? __pfx_addrconf_sysctl_forward (net/ipv6/addrconf.c:6312) 
[ 39.000922][ T376] ? __pfx_addrconf_sysctl_forward (net/ipv6/addrconf.c:6312) 
[ 39.001095][ T376] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 39.001234][ T376] ? __kmalloc_node (mm/slub.c:3974) 
[ 39.001382][ T376] ? proc_sys_call_handler (fs/proc/proc_sysctl.c:578) 
[ 39.001531][ T376] proc_sys_call_handler (fs/proc/proc_sysctl.c:595) 
[ 39.001669][ T376] ? __pfx_proc_sys_call_handler (fs/proc/proc_sysctl.c:550) 
[ 39.001836][ T376] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 39.001983][ T376] vfs_write (./include/linux/fs.h:2108 fs/read_write.c:497 fs/read_write.c:590) 
[ 39.002088][ T376] ? 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) 
[ 39.002231][ T376] ? __pfx_vfs_write (fs/read_write.c:571) 
[ 39.002375][ T376] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 39.002513][ T376] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 39.002741][ T376] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 39.002882][ T376] ksys_write (fs/read_write.c:643) 
[ 39.002986][ T376] ? __pfx_ksys_write (fs/read_write.c:633) 
[ 39.003122][ T376] ? do_user_addr_fault (./include/linux/rcupdate.h:815 ./include/linux/mm.h:702 arch/x86/mm/fault.c:1364) 
[ 39.003267][ T376] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 39.003491][ T376] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   39.003670][  T376] RIP: 0033:0x7f8dfde37957
[ 39.003819][ T376] 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
[   39.004412][  T376] RSP: 002b:00007ffe0c534738 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   39.004629][  T376] RAX: ffffffffffffffda RBX: 000055fa3f593360 RCX: 00007f8dfde37957
[   39.004937][  T376] RDX: 0000000000000002 RSI: 000055fa3f5933a0 RDI: 0000000000000005
[   39.005151][  T376] RBP: 000055fa3f5954d0 R08: 0000000000000003 R09: 0000000000000077
[   39.005365][  T376] R10: 000000000000006b R11: 0000000000000246 R12: 0000000000000002


Finger prints:
dump_stack_lvl:print_bad_irq_dependency:check_irq_usage:check_prev_add