======================================
| [ 40.206474][ T401] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   40.206728][  T401]
| [   40.206798][  T401]
| [   40.206798][  T401] stack backtrace:
[   40.207263][  T401] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   40.207571][  T401] Call Trace:
[   40.207676][  T401]  <TASK>
[ 40.207747][ T401] dump_stack_lvl (lib/dump_stack.c:117) 
[ 40.207972][ T401] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) 
[ 40.208113][ T401] ? 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) 
[ 40.208253][ T401] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) 
[ 40.208425][ T401] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 40.208643][ T401] ? __bfs (kernel/locking/lockdep.c:1787) 
[ 40.208747][ T401] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 40.208886][ T401] check_irq_usage (kernel/locking/lockdep.c:2871) 
[ 40.209041][ T401] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) 
[ 40.209181][ T401] ? __bfs (kernel/locking/lockdep.c:1787) 
[ 40.209366][ T401] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) 
[ 40.209508][ T401] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) 
[ 40.209649][ T401] ? check_noncircular (kernel/locking/lockdep.c:2172) 
[ 40.209787][ T401] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) 
[ 40.210008][ T401] ? check_prev_add (kernel/locking/lockdep.c:3138) 
[ 40.210147][ T401] check_prev_add (kernel/locking/lockdep.c:3138) 
[ 40.210284][ T401] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 40.210421][ T401] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) 
[ 40.210638][ T401] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 40.210743][ T401] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 40.210880][ T401] ? 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) 
[ 40.211018][ T401] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 40.211123][ T401] __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 40.211342][ T401] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 40.211478][ T401] ? __get_task_comm (fs/exec.c:1234) 
[ 40.211616][ T401] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 40.211720][ T401] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 40.211862][ T401] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 40.212165][ T401] ? __get_task_comm (fs/exec.c:1234) 
[ 40.212304][ T401] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 40.212443][ T401] ? __get_task_comm (fs/exec.c:1234) 
[ 40.212579][ T401] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 40.212804][ T401] ? __get_task_comm (fs/exec.c:1234) 
[ 40.212941][ T401] __get_task_comm (fs/exec.c:1234) 
[ 40.213076][ T401] ref_tracker_alloc (lib/ref_tracker.c:217) 
[ 40.213213][ T401] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) 
[ 40.213355][ T401] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) 
[ 40.213493][ T401] ? netdev_get_by_index (net/core/dev.c:914) 
[ 40.213629][ T401] ? fib6_nh_init (net/ipv6/route.c:3541) 
[ 40.213765][ T401] ? ip6_route_info_create (net/ipv6/route.c:3808) 
[ 40.213984][ T401] ? addrconf_f6i_alloc (net/ipv6/route.c:4584) 
[ 40.214121][ T401] ? __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) 
[ 40.214257][ T401] ? addrconf_join_anycast (net/ipv6/addrconf.c:2264) 
[ 40.214395][ T401] ? dev_forward_change (./include/linux/list.h:373 net/ipv6/addrconf.c:833) 
[ 40.214533][ T401] ? addrconf_fixup_forwarding (net/ipv6/addrconf.c:854 net/ipv6/addrconf.c:898) 
[ 40.214780][ T401] ? addrconf_sysctl_forward (net/ipv6/addrconf.c:6329) 
[ 40.214917][ T401] ? proc_sys_call_handler (fs/proc/proc_sysctl.c:595) 
[ 40.215056][ T401] ? vfs_write (./include/linux/fs.h:2108 fs/read_write.c:497 fs/read_write.c:590) 
[ 40.215194][ T401] ? ksys_write (fs/read_write.c:643) 
[ 40.215415][ T401] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 40.215553][ T401] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 40.215725][ T401] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) 
[ 40.215874][ T401] netdev_get_by_index (net/core/dev.c:914) 
[ 40.216094][ T401] fib6_nh_init (net/ipv6/route.c:3541) 
[ 40.216232][ T401] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) 
[ 40.216405][ T401] ? __pfx_fib6_nh_init (net/ipv6/route.c:3522) 
[ 40.216545][ T401] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 40.216765][ T401] ? __kasan_kmalloc (mm/kasan/common.c:391) 
[ 40.216904][ T401] ? __kmalloc (mm/slub.c:3980) 
[ 40.217044][ T401] ? fib6_get_table (net/ipv6/ip6_fib.c:295) 
[ 40.217184][ T401] ip6_route_info_create (net/ipv6/route.c:3808) 
[ 40.217322][ T401] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 40.217465][ T401] ? __pfx_ip6_route_info_create (net/ipv6/route.c:3691) 
[ 40.217635][ T401] ? addrconf_f6i_alloc (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/l3mdev.h:138 net/ipv6/route.c:4564) 
[ 40.217773][ T401] addrconf_f6i_alloc (net/ipv6/route.c:4584) 
[ 40.217991][ T401] ? __pfx_addrconf_f6i_alloc (net/ipv6/route.c:4562) 
[ 40.218130][ T401] ? 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) 
[ 40.218267][ T401] ? __pfx_do_raw_write_lock (kernel/locking/spinlock_debug.c:209) 
[ 40.218410][ T401] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 40.218629][ T401] __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) 
[ 40.218766][ T401] addrconf_join_anycast (net/ipv6/addrconf.c:2264) 
[ 40.218904][ T401] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 40.219023][ T401] ? __pfx_addrconf_join_anycast (net/ipv6/addrconf.c:2256) 
[ 40.219276][ T401] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 40.219450][ T401] dev_forward_change (./include/linux/list.h:373 net/ipv6/addrconf.c:833) 
[ 40.219588][ T401] ? __pfx_dev_forward_change (net/ipv6/addrconf.c:803) 
[ 40.219736][ T401] addrconf_fixup_forwarding (net/ipv6/addrconf.c:854 net/ipv6/addrconf.c:898) 
[ 40.219962][ T401] addrconf_sysctl_forward (net/ipv6/addrconf.c:6329) 
[ 40.220100][ T401] ? __pfx_addrconf_sysctl_forward (net/ipv6/addrconf.c:6312) 
[ 40.220272][ T401] ? __pfx_addrconf_sysctl_forward (net/ipv6/addrconf.c:6312) 
[ 40.220442][ T401] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 40.220665][ T401] ? __kmalloc_node (mm/slub.c:3974) 
[ 40.220803][ T401] ? proc_sys_call_handler (fs/proc/proc_sysctl.c:578) 
[ 40.220945][ T401] proc_sys_call_handler (fs/proc/proc_sysctl.c:595) 
[ 40.221083][ T401] ? __pfx_proc_sys_call_handler (fs/proc/proc_sysctl.c:550) 
[ 40.221332][ T401] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 40.221473][ T401] vfs_write (./include/linux/fs.h:2108 fs/read_write.c:497 fs/read_write.c:590) 
[ 40.221578][ T401] ? 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) 
[ 40.221716][ T401] ? __pfx_vfs_write (fs/read_write.c:571) 
[ 40.221855][ T401] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 40.222076][ T401] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 40.222220][ T401] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 40.222358][ T401] ksys_write (fs/read_write.c:643) 
[ 40.222463][ T401] ? __pfx_ksys_write (fs/read_write.c:633) 
[ 40.222769][ T401] ? do_user_addr_fault (./include/linux/rcupdate.h:815 ./include/linux/mm.h:702 arch/x86/mm/fault.c:1364) 
[ 40.222907][ T401] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 40.223044][ T401] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   40.223214][  T401] RIP: 0033:0x7f61c1b0b957
[ 40.223361][ T401] 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
[   40.223846][  T401] RSP: 002b:00007ffe63c03be8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   40.224138][  T401] RAX: ffffffffffffffda RBX: 000056381e14b360 RCX: 00007f61c1b0b957
[   40.224346][  T401] RDX: 0000000000000002 RSI: 000056381e14b3a0 RDI: 0000000000000005
[   40.224556][  T401] RBP: 000056381e14d4d0 R08: 0000000000000003 R09: 0000000000000077
[   40.224848][  T401] R10: 000000000000006b R11: 0000000000000246 R12: 0000000000000002


Finger prints:
dump_stack_lvl:print_bad_irq_dependency:check_irq_usage:check_prev_add