======================================
| [ 43.862798][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   43.862983][    C2]
| [   43.863058][    C2]
| [   43.863058][    C2] stack backtrace:
[   43.863564][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   43.863896][    C2] Call Trace:
[   43.864010][    C2]  <IRQ>
[ 43.864272][ C2] dump_stack_lvl (lib/dump_stack.c:117) 
[ 43.864426][ C2] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 43.864612][ C2] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 43.864771][ C2] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 43.865054][ C2] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 43.865204][ C2] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 43.865354][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 43.865511][ C2] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 43.865766][ C2] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 43.865919][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 43.866072][ C2] ? save_trace (kernel/locking/lockdep.c:586) 
[ 43.866224][ C2] mark_lock (kernel/locking/lockdep.c:4678) 
[ 43.866342][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 43.866582][ C2] mark_usage (kernel/locking/lockdep.c:4567) 
[ 43.866696][ C2] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 43.866858][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 43.867010][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 43.867249][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 43.867403][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 43.867553][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 43.867708][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 43.867948][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 43.868102][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 43.868252][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 43.868401][ C2] _raw_write_lock (./include/linux/rwlock_api_smp.h:210 kernel/locking/spinlock.c:300) 
[ 43.868552][ C2] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 43.868792][ C2] addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 43.868942][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 43.869093][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 43.869246][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 43.869486][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 43.869635][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 43.869786][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 43.869935][ C2] call_timer_fn (kernel/time/timer.c:1793) 
[ 43.870176][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 43.870326][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 43.870476][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 43.870630][ C2] ? 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) 
[ 43.870883][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 43.871035][ C2] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 43.871185][ C2] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 43.871337][ C2] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 43.871488][ C2] ? 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) 
[ 43.871637][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 43.871793][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 43.871943][ C2] ? run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 43.872100][ C2] run_timer_softirq (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2438 kernel/time/timer.c:2448) 
[ 43.872341][ C2] __do_softirq (kernel/softirq.c:554) 
[ 43.872493][ C2] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 43.872614][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   43.872769][    C2]  </IRQ>
[   43.872848][    C2]  <TASK>
[ 43.873012][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 43.873200][ C2] RIP: 0010:_raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:160 kernel/locking/spinlock.c:202) 
[ 43.873402][ C2] Code: 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 85 49 9b fd 48 89 ef e8 bd b9 9b fd e8 d8 b3 be fd fb 65 ff 0d 78 bf af 5f <74> 06 5d c3 cc cc cc cc 0f 1f 44 00 00 5d c3 cc cc cc cc 66 66 2e
All code
========
   0:	44 00 00             	add    %r8b,(%rax)
   3:	55                   	push   %rbp
   4:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
   9:	48 89 fd             	mov    %rdi,%rbp
   c:	48 83 c7 18          	add    $0x18,%rdi
  10:	e8 85 49 9b fd       	call   0xfffffffffd9b499a
  15:	48 89 ef             	mov    %rbp,%rdi
  18:	e8 bd b9 9b fd       	call   0xfffffffffd9bb9da
  1d:	e8 d8 b3 be fd       	call   0xfffffffffdbeb3fa
  22:	fb                   	sti
  23:	65 ff 0d 78 bf af 5f 	decl   %gs:0x5fafbf78(%rip)        # 0x5fafbfa2
  2a:*	74 06                	je     0x32		<-- trapping instruction
  2c:	5d                   	pop    %rbp
  2d:	c3                   	ret
  2e:	cc                   	int3
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	cc                   	int3
  32:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  37:	5d                   	pop    %rbp
  38:	c3                   	ret
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	cc                   	int3
  3c:	cc                   	int3
  3d:	66                   	data16
  3e:	66                   	data16
  3f:	2e                   	cs

Code starting with the faulting instruction
===========================================
   0:	74 06                	je     0x8
   2:	5d                   	pop    %rbp
   3:	c3                   	ret
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   d:	5d                   	pop    %rbp
   e:	c3                   	ret
   f:	cc                   	int3
  10:	cc                   	int3
  11:	cc                   	int3
  12:	cc                   	int3
  13:	66                   	data16
  14:	66                   	data16
  15:	2e                   	cs
[   43.874033][    C2] RSP: 0018:ffffc90000bff3d8 EFLAGS: 00000282
[   43.874223][    C2] RAX: 000000000000680d RBX: 1ffff9200017fe80 RCX: 1ffffffff46e4456
[   43.874541][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffa0540888
[   43.874776][    C2] RBP: ffff888005b72000 R08: 0000000000000001 R09: fffffbfff46e38a5
[   43.874999][    C2] R10: ffffffffa371c52f R11: ffffc90000bfef21 R12: ffff888004f16940
[   43.875313][    C2] R13: 0000000000000000 R14: ffff888004f16938 R15: 0000000000000000
[ 43.875551][ C2] ? _raw_spin_unlock_irq (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:77 ./include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202) 
[ 43.875703][ C2] ? _raw_spin_unlock_irq (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:77 ./include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202) 
[ 43.875860][ C2] p9_tag_alloc (./include/linux/local_lock_internal.h:36 ./include/linux/idr.h:174 net/9p/client.c:321) 
[ 43.876193][ C2] ? __pfx_p9_tag_alloc (net/9p/client.c:277) 
[ 43.876344][ C2] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 43.876496][ C2] ? 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) 
[ 43.876648][ C2] p9_client_prepare_req (net/9p/client.c:641) 
[ 43.876893][ C2] ? 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) 
[ 43.877046][ C2] ? __pfx_p9_client_prepare_req (net/9p/client.c:625) 
[ 43.877236][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 43.877389][ C2] p9_client_rpc (net/9p/client.c:688 (discriminator 4)) 
[ 43.877632][ C2] ? __pfx_p9_client_rpc (net/9p/client.c:672) 
[ 43.877786][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 43.877937][ C2] ? p9_fid_create (./include/linux/local_lock_internal.h:38 ./include/linux/idr.h:174 net/9p/client.c:867) 
[ 43.878087][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 43.878326][ C2] ? 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) 
[ 43.878480][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 43.878631][ C2] ? p9_fid_create (./include/linux/local_lock_internal.h:38 ./include/linux/idr.h:174 net/9p/client.c:867) 
[ 43.878782][ C2] p9_client_walk (net/9p/client.c:1169) 
[ 43.879022][ C2] ? __pfx_p9_client_walk (net/9p/client.c:1143) 
[ 43.879179][ C2] ? d_alloc_parallel (./arch/x86/include/asm/bitops.h:94 ./arch/x86/include/asm/bitops.h:112 ./include/asm-generic/bitops/instrumented-lock.h:43 ./include/linux/bit_spinlock.h:80 ./include/linux/list_bl.h:153 fs/dcache.c:2556) 
[ 43.879332][ C2] ? v9fs_fid_lookup_with_uid (fs/9p/fid.c:181) 
[ 43.879484][ C2] ? v9fs_vfs_lookup.part.0 (fs/9p/vfs_inode.c:676) 
[ 43.879635][ C2] v9fs_vfs_lookup.part.0 (fs/9p/vfs_inode.c:676) 
[ 43.879876][ C2] ? __pfx_v9fs_vfs_lookup.part.0 (fs/9p/vfs_inode.c:649) 
[ 43.880063][ C2] ? lockdep_init_map_type (kernel/locking/lockdep.c:4892) 
[ 43.880216][ C2] __lookup_slow (fs/namei.c:1692) 
[ 43.880370][ C2] ? __pfx___lookup_slow (fs/namei.c:1668) 
[ 43.880611][ C2] ? walk_component (fs/namei.c:1709 fs/namei.c:2004) 
[ 43.880764][ C2] walk_component (./include/linux/fs.h:808 fs/namei.c:1710 fs/namei.c:2004) 
[ 43.880914][ C2] link_path_walk.part.0.constprop.0 (fs/namei.c:2331) 
[ 43.881102][ C2] ? __pfx_link_path_walk.part.0.constprop.0 (fs/namei.c:2249) 
[ 43.881379][ C2] path_openat (fs/namei.c:3795) 
[ 43.881534][ C2] ? __pfx_path_openat (fs/namei.c:3781) 
[ 43.881684][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 43.881840][ C2] do_filp_open (fs/namei.c:3826) 
[ 43.882078][ C2] ? __pfx_do_filp_open (fs/namei.c:3820) 
[ 43.882227][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 43.882378][ C2] ? 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) 
[ 43.882528][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 43.882766][ C2] ? alloc_fd (fs/file.c:555 (discriminator 10)) 
[ 43.882880][ C2] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 43.883030][ C2] ? _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 43.883183][ C2] ? alloc_fd (fs/file.c:555 (discriminator 10)) 
[ 43.883304][ C2] do_sys_openat2 (fs/open.c:1406) 
[ 43.883545][ C2] ? vfs_fstatat (fs/stat.c:308) 
[ 43.883699][ C2] ? __pfx_do_sys_openat2 (fs/open.c:1392) 
[ 43.883856][ C2] ? __pfx___do_sys_newfstatat (fs/stat.c:464) 
[ 43.884011][ C2] __x64_sys_openat (fs/open.c:1432) 
[ 43.884250][ C2] ? __pfx___x64_sys_openat (fs/open.c:1432) 
[ 43.884399][ C2] ? __pfx_do_faccessat (fs/open.c:465) 
[ 43.884551][ C2] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 43.884711][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   43.884992][    C2] RIP: 0033:0x7f88180370e8
[ 43.885146][ C2] Code: f9 41 89 f0 41 83 e2 40 75 30 89 f0 25 00 00 41 00 3d 00 00 41 00 74 22 44 89 c2 4c 89 ce bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 30 c3 0f 1f 80 00 00 00 00 48 8d 44 24 08 c7
All code
========
   0:	f9                   	stc
   1:	41 89 f0             	mov    %esi,%r8d
   4:	41 83 e2 40          	and    $0x40,%r10d
   8:	75 30                	jne    0x3a
   a:	89 f0                	mov    %esi,%eax
   c:	25 00 00 41 00       	and    $0x410000,%eax
  11:	3d 00 00 41 00       	cmp    $0x410000,%eax
  16:	74 22                	je     0x3a
  18:	44 89 c2             	mov    %r8d,%edx
  1b:	4c 89 ce             	mov    %r9,%rsi
  1e:	bf 9c ff ff ff       	mov    $0xffffff9c,%edi
  23:	b8 01 01 00 00       	mov    $0x101,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 30                	ja     0x62
  32:	c3                   	ret
  33:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  3a:	48 8d 44 24 08       	lea    0x8(%rsp),%rax
  3f:	c7                   	.byte 0xc7

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 30                	ja     0x38
   8:	c3                   	ret
   9:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  10:	48 8d 44 24 08       	lea    0x8(%rsp),%rax
  15:	c7                   	.byte 0xc7
[   43.885681][    C2] RSP: 002b:00007ffcf118f078 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
[   43.885910][    C2] RAX: ffffffffffffffda RBX: 00007ffcf118f30f RCX: 00007f88180370e8
[   43.886135][    C2] RDX: 0000000000080000 RSI: 00007ffcf118f0f0 RDI: 00000000ffffff9c
[   43.886449][    C2] RBP: 00007ffcf118f0e0 R08: 0000000000080000 R09: 00007ffcf118f0f0
[   43.886672][    C2] R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffcf118f0f7


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage