======================================
| [ 40.646933][ T404] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   40.647212][  T404]
| [   40.647292][  T404]
| [   40.647292][  T404] stack backtrace:
[   40.647708][  T404] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   40.648144][  T404] Call Trace:
[   40.648259][  T404]  <TASK>
[ 40.648340][ T404] dump_stack_lvl (lib/dump_stack.c:117) 
[ 40.648499][ T404] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) 
[ 40.648738][ 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) 
[ 40.648890][ T404] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) 
[ 40.649082][ T404] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 40.649237][ T404] ? __bfs (kernel/locking/lockdep.c:1787) 
[ 40.649453][ T404] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 40.649606][ T404] check_irq_usage (kernel/locking/lockdep.c:2871) 
[ 40.649762][ T404] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) 
[ 40.649917][ T404] ? __bfs (kernel/locking/lockdep.c:1787) 
[ 40.650035][ T404] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) 
[ 40.650196][ T404] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) 
[ 40.650349][ T404] ? check_noncircular (kernel/locking/lockdep.c:2172) 
[ 40.650506][ T404] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) 
[ 40.650674][ T404] ? check_prev_add (kernel/locking/lockdep.c:3138) 
[ 40.650905][ T404] check_prev_add (kernel/locking/lockdep.c:3138) 
[ 40.651057][ T404] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 40.651217][ T404] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) 
[ 40.651375][ T404] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 40.651570][ T404] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 40.651740][ 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) 
[ 40.651895][ T404] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 40.652012][ T404] __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 40.652173][ T404] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 40.652426][ T404] ? __get_task_comm (fs/exec.c:1234) 
[ 40.652579][ T404] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 40.652695][ T404] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 40.652848][ T404] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 40.653002][ T404] ? __get_task_comm (fs/exec.c:1234) 
[ 40.653162][ T404] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 40.653318][ T404] ? __get_task_comm (fs/exec.c:1234) 
[ 40.653479][ T404] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 40.653723][ T404] ? __get_task_comm (fs/exec.c:1234) 
[ 40.653876][ T404] __get_task_comm (fs/exec.c:1234) 
[ 40.654031][ T404] ref_tracker_alloc (lib/ref_tracker.c:217) 
[ 40.654185][ T404] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) 
[ 40.654339][ T404] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) 
[ 40.654573][ T404] ? netdev_get_by_index (net/core/dev.c:914) 
[ 40.654727][ T404] ? fib6_nh_init (net/ipv6/route.c:3541) 
[ 40.654882][ T404] ? ip6_route_info_create (net/ipv6/route.c:3808) 
[ 40.655048][ T404] ? addrconf_f6i_alloc (net/ipv6/route.c:4584) 
[ 40.655277][ T404] ? __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) 
[ 40.655436][ T404] ? addrconf_join_anycast (net/ipv6/addrconf.c:2264) 
[ 40.655592][ T404] ? dev_forward_change (./include/linux/list.h:373 net/ipv6/addrconf.c:833) 
[ 40.655745][ T404] ? addrconf_fixup_forwarding (net/ipv6/addrconf.c:854 net/ipv6/addrconf.c:898) 
[ 40.656013][ T404] ? addrconf_sysctl_forward (net/ipv6/addrconf.c:6329) 
[ 40.656166][ T404] ? proc_sys_call_handler (fs/proc/proc_sysctl.c:595) 
[ 40.656325][ T404] ? vfs_write (./include/linux/fs.h:2108 fs/read_write.c:497 fs/read_write.c:590) 
[ 40.656476][ T404] ? ksys_write (fs/read_write.c:643) 
[ 40.656712][ T404] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 40.656865][ T404] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 40.657065][ T404] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) 
[ 40.657225][ T404] netdev_get_by_index (net/core/dev.c:914) 
[ 40.657478][ T404] fib6_nh_init (net/ipv6/route.c:3541) 
[ 40.657639][ T404] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) 
[ 40.657832][ T404] ? __pfx_fib6_nh_init (net/ipv6/route.c:3522) 
[ 40.657987][ T404] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 40.658137][ T404] ? __kasan_kmalloc (mm/kasan/common.c:391) 
[ 40.658297][ T404] ? __kmalloc (mm/slub.c:3980) 
[ 40.658450][ T404] ? fib6_get_table (net/ipv6/ip6_fib.c:295) 
[ 40.658606][ T404] ip6_route_info_create (net/ipv6/route.c:3808) 
[ 40.658841][ T404] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 40.658994][ T404] ? __pfx_ip6_route_info_create (net/ipv6/route.c:3691) 
[ 40.659185][ T404] ? addrconf_f6i_alloc (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/l3mdev.h:138 net/ipv6/route.c:4564) 
[ 40.659343][ T404] addrconf_f6i_alloc (net/ipv6/route.c:4584) 
[ 40.659585][ T404] ? __pfx_addrconf_f6i_alloc (net/ipv6/route.c:4562) 
[ 40.659744][ 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) 
[ 40.659903][ T404] ? __pfx_do_raw_write_lock (kernel/locking/spinlock_debug.c:209) 
[ 40.660053][ T404] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 40.660207][ T404] __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) 
[ 40.660465][ T404] addrconf_join_anycast (net/ipv6/addrconf.c:2264) 
[ 40.660616][ T404] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 40.660730][ T404] ? __pfx_addrconf_join_anycast (net/ipv6/addrconf.c:2256) 
[ 40.660927][ T404] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 40.661207][ T404] dev_forward_change (./include/linux/list.h:373 net/ipv6/addrconf.c:833) 
[ 40.661363][ T404] ? __pfx_dev_forward_change (net/ipv6/addrconf.c:803) 
[ 40.661520][ T404] addrconf_fixup_forwarding (net/ipv6/addrconf.c:854 net/ipv6/addrconf.c:898) 
[ 40.661683][ T404] addrconf_sysctl_forward (net/ipv6/addrconf.c:6329) 
[ 40.661918][ T404] ? __pfx_addrconf_sysctl_forward (net/ipv6/addrconf.c:6312) 
[ 40.662115][ T404] ? __pfx_addrconf_sysctl_forward (net/ipv6/addrconf.c:6312) 
[ 40.662308][ T404] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 40.662461][ T404] ? __kmalloc_node (mm/slub.c:3974) 
[ 40.662696][ T404] ? proc_sys_call_handler (fs/proc/proc_sysctl.c:578) 
[ 40.662852][ T404] proc_sys_call_handler (fs/proc/proc_sysctl.c:595) 
[ 40.663017][ T404] ? __pfx_proc_sys_call_handler (fs/proc/proc_sysctl.c:550) 
[ 40.663223][ T404] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 40.663462][ T404] vfs_write (./include/linux/fs.h:2108 fs/read_write.c:497 fs/read_write.c:590) 
[ 40.663577][ 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) 
[ 40.663731][ T404] ? __pfx_vfs_write (fs/read_write.c:571) 
[ 40.663888][ T404] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 40.664119][ T404] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 40.664275][ T404] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 40.664434][ T404] ksys_write (fs/read_write.c:643) 
[ 40.664549][ T404] ? __pfx_ksys_write (fs/read_write.c:633) 
[ 40.664707][ T404] ? do_user_addr_fault (./include/linux/rcupdate.h:815 ./include/linux/mm.h:702 arch/x86/mm/fault.c:1364) 
[ 40.664948][ T404] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 40.665111][ T404] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   40.665306][  T404] RIP: 0033:0x7f2c914a4957
[ 40.665475][ 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
[   40.666159][  T404] RSP: 002b:00007ffdd8fd82c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   40.666394][  T404] RAX: ffffffffffffffda RBX: 000055a726829360 RCX: 00007f2c914a4957
[   40.666624][  T404] RDX: 0000000000000002 RSI: 000055a7268293a0 RDI: 0000000000000005
[   40.666855][  T404] RBP: 000055a72682b4d0 R08: 0000000000000003 R09: 0000000000000077
[   40.667085][  T404] R10: 000000000000006b R11: 0000000000000246 R12: 0000000000000002


Finger prints:
dump_stack_lvl:print_bad_irq_dependency:check_irq_usage:check_prev_add