======================================
| [ 30.042061][ C0] asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623) 
| [   30.042214][    C0]
| [   30.042291][    C0]
| [   30.042291][    C0] stack backtrace:
[   30.042818][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   30.043159][    C0] Call Trace:
[   30.043280][    C0]  <IRQ>
[ 30.043364][ C0] dump_stack_lvl (lib/dump_stack.c:117) 
[ 30.043523][ C0] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 30.043718][ C0] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 30.043892][ C0] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 30.044188][ C0] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 30.044343][ C0] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 30.044497][ C0] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 30.044655][ C0] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 30.044813][ C0] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 30.044968][ C0] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 30.045135][ C0] ? save_trace (kernel/locking/lockdep.c:586) 
[ 30.045286][ C0] mark_lock (kernel/locking/lockdep.c:4678) 
[ 30.045404][ C0] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 30.045555][ C0] mark_usage (kernel/locking/lockdep.c:4567) 
[ 30.045670][ C0] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 30.045842][ C0] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 30.045999][ C0] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 30.046152][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 30.046307][ C0] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.046461][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 30.046618][ C0] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 30.046777][ C0] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.046930][ C0] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 30.047094][ C0] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.047243][ C0] _raw_write_lock (./include/linux/rwlock_api_smp.h:210 kernel/locking/spinlock.c:300) 
[ 30.047395][ C0] ? addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.047544][ C0] addrconf_rs_timer (net/ipv6/addrconf.c:4023) 
[ 30.047702][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 30.047853][ C0] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 30.048006][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 30.048157][ C0] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 30.048308][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 30.048462][ C0] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 30.048613][ C0] call_timer_fn (kernel/time/timer.c:1793) 
[ 30.048765][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 30.048917][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 30.049067][ C0] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 30.049222][ C0] ? 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) 
[ 30.049374][ C0] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 30.049526][ C0] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 30.049679][ C0] ? __pfx_addrconf_rs_timer (net/ipv6/addrconf.c:4016) 
[ 30.049829][ C0] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 30.049980][ C0] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 30.050132][ C0] ? 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) 
[ 30.050283][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 30.050432][ C0] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 30.050590][ C0] ? timer_expire_remote (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 30.050742][ C0] timer_expire_remote (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 30.050892][ C0] tmigr_handle_remote_cpu (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:67 ./arch/x86/include/asm/irqflags.h:127 kernel/time/timer_migration.c:925) 
[ 30.051042][ C0] ? __pfx_tmigr_handle_remote_cpu (kernel/time/timer_migration.c:869) 
[ 30.051229][ C0] ? 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) 
[ 30.051379][ C0] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 30.051497][ C0] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 30.051648][ C0] tmigr_handle_remote_up (kernel/time/timer_migration.c:1003) 
[ 30.051824][ C0] tmigr_handle_remote (kernel/time/timer_migration.c:488 kernel/time/timer_migration.c:1061) 
[ 30.051980][ C0] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) 
[ 30.052136][ C0] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 30.052291][ C0] __do_softirq (kernel/softirq.c:554) 
[ 30.052456][ C0] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 30.052576][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   30.052731][    C0]  </IRQ>
[   30.052815][    C0]  <TASK>
[ 30.052894][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 30.053089][ C0] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 30.053290][ C0] Code: 10 e8 81 31 79 fd 48 89 ef e8 b9 a1 79 fd 81 e3 00 02 00 00 75 1d 9c 58 f6 c4 02 75 29 48 85 db 74 01 fb 65 ff 0d f5 8b 0d 71 <74> 0e 5b 5d c3 cc cc cc cc e8 0f 00 9d fd eb dc 0f 1f 44 00 00 5b
All code
========
   0:	10 e8                	adc    %ch,%al
   2:	81 31 79 fd 48 89    	xorl   $0x8948fd79,(%rcx)
   8:	ef                   	out    %eax,(%dx)
   9:	e8 b9 a1 79 fd       	call   0xfffffffffd79a1c7
   e:	81 e3 00 02 00 00    	and    $0x200,%ebx
  14:	75 1d                	jne    0x33
  16:	9c                   	pushf
  17:	58                   	pop    %rax
  18:	f6 c4 02             	test   $0x2,%ah
  1b:	75 29                	jne    0x46
  1d:	48 85 db             	test   %rbx,%rbx
  20:	74 01                	je     0x23
  22:	fb                   	sti
  23:	65 ff 0d f5 8b 0d 71 	decl   %gs:0x710d8bf5(%rip)        # 0x710d8c1f
  2a:*	74 0e                	je     0x3a		<-- trapping instruction
  2c:	5b                   	pop    %rbx
  2d:	5d                   	pop    %rbp
  2e:	c3                   	ret
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	cc                   	int3
  32:	cc                   	int3
  33:	e8 0f 00 9d fd       	call   0xfffffffffd9d0047
  38:	eb dc                	jmp    0x16
  3a:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  3f:	5b                   	pop    %rbx

Code starting with the faulting instruction
===========================================
   0:	74 0e                	je     0x10
   2:	5b                   	pop    %rbx
   3:	5d                   	pop    %rbp
   4:	c3                   	ret
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	cc                   	int3
   9:	e8 0f 00 9d fd       	call   0xfffffffffd9d001d
   e:	eb dc                	jmp    0xffffffffffffffec
  10:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  15:	5b                   	pop    %rbx
[   30.053845][    C0] RSP: 0000:ffffc9000060f390 EFLAGS: 00000286
[   30.054050][    C0] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff2447e97
[   30.054285][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8ef63de1
[   30.054522][    C0] RBP: ffff8880025bde08 R08: 0000000000000001 R09: fffffbfff24436af
[   30.054756][    C0] R10: ffffffff9221b57f R11: ffff88803603de40 R12: ffff8880025bde98
[   30.054992][    C0] R13: ffff8880025bde48 R14: ffff888001042340 R15: 0000000000000000
[ 30.055232][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 30.055424][ C0] __delete_object (mm/kmemleak.c:798 (discriminator 3)) 
[ 30.055578][ C0] ? delete_object_full (mm/kmemleak.c:817) 
[ 30.055736][ C0] kfree (./include/linux/kmemleak.h:48 mm/slub.c:2072 mm/slub.c:4280 mm/slub.c:4390) 
[ 30.055850][ C0] ? p9_virtio_zc_request (net/9p/trans_virtio.c:558) 
[ 30.056100][ C0] p9_virtio_zc_request (net/9p/trans_virtio.c:558) 
[ 30.056252][ C0] ? __pfx_p9pdu_writef (net/9p/protocol.c:709) 
[ 30.056403][ C0] ? __pfx_p9_virtio_zc_request (net/9p/trans_virtio.c:424) 
[ 30.056557][ C0] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 30.056711][ C0] ? trace_9p_protocol_dump (./include/trace/events/9p.h:172 (discriminator 55)) 
[ 30.056862][ C0] ? trace_9p_client_req (./include/trace/events/9p.h:124 (discriminator 52)) 
[ 30.057012][ C0] ? __pfx_autoremove_wake_function (kernel/sched/wait.c:383) 
[ 30.057201][ C0] ? __pfx_p9_client_prepare_req (net/9p/client.c:625) 
[ 30.057488][ C0] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 30.057661][ C0] ? 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) 
[ 30.057816][ C0] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 30.057938][ C0] p9_client_zc_rpc.constprop.0 (net/9p/client.c:805) 
[ 30.058132][ C0] ? __pfx_p9_client_zc_rpc.constprop.0 (net/9p/client.c:775) 
[ 30.058327][ C0] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 30.058482][ C0] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 30.058640][ C0] ? __debug_object_init (lib/debugobjects.c:622) 
[ 30.058902][ C0] p9_client_read_once (net/9p/client.c:1565) 
[ 30.059059][ C0] ? __pfx_p9_client_read_once (net/9p/client.c:1534) 
[ 30.059213][ C0] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 30.059409][ C0] ? __debug_object_init (lib/debugobjects.c:622) 
[ 30.059566][ C0] p9_client_read (net/9p/client.c:1522) 
[ 30.059724][ C0] v9fs_issue_read (fs/9p/vfs_addr.c:76) 
[ 30.059879][ C0] ? __pfx_v9fs_issue_read (fs/9p/vfs_addr.c:66) 
[ 30.060033][ C0] ? netfs_rreq_prepare_read (fs/netfs/io.c:640) 
[ 30.060300][ C0] netfs_rreq_submit_slice (fs/netfs/io.c:694) 
[ 30.060470][ C0] netfs_begin_read (fs/netfs/io.c:741) 
[ 30.060628][ C0] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 30.060787][ C0] ? __pfx_netfs_begin_read (fs/netfs/io.c:708) 
[ 30.060941][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 30.061096][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 30.061252][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 30.061406][ C0] ? netfs_alloc_request (fs/netfs/objects.c:64) 
[ 30.061561][ C0] ? 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) 
[ 30.061826][ C0] ? _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 30.061979][ C0] netfs_read_folio (fs/netfs/buffered_read.c:318) 
[ 30.062129][ C0] ? maybe_unlock_mmap_for_io (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/linux/mm.h:702 ./include/linux/mm.h:765 mm/internal.h:868 mm/internal.h:852) 
[ 30.062280][ C0] ? __pfx_netfs_read_folio (fs/netfs/buffered_read.c:248) 
[ 30.062555][ C0] filemap_read_folio (mm/filemap.c:2331) 
[ 30.062711][ C0] filemap_fault (mm/filemap.c:3382) 
[ 30.062867][ C0] ? __pfx_filemap_fault (mm/filemap.c:3250) 
[ 30.063025][ C0] ? do_fault_around (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 mm/memory.c:4855) 
[ 30.063180][ C0] ? __pfx_filemap_map_pages (mm/filemap.c:3565) 
[ 30.063338][ C0] __do_fault (mm/memory.c:4531) 
[ 30.063456][ C0] do_pte_missing (mm/memory.c:4894 mm/memory.c:5024 mm/memory.c:3880) 
[ 30.063610][ C0] __handle_mm_fault (mm/memory.c:5441) 
[ 30.063764][ C0] ? __pfx___handle_mm_fault (mm/memory.c:5352) 
[ 30.063930][ C0] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 30.064087][ C0] ? lock_vma_under_rcu (mm/memory.c:5787) 
[ 30.064242][ C0] handle_mm_fault (mm/memory.c:5610) 
[ 30.064396][ C0] ? __pfx_handle_mm_fault (mm/memory.c:5576) 
[ 30.064654][ C0] do_user_addr_fault (arch/x86/mm/fault.c:1362) 
[ 30.064809][ C0] ? irqentry_enter_from_user_mode (./include/linux/entry-common.h:117 kernel/entry/common.c:225) 
[ 30.065004][ C0] exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:67 ./arch/x86/include/asm/irqflags.h:127 arch/x86/mm/fault.c:1513 arch/x86/mm/fault.c:1563) 
[ 30.065167][ C0] asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623) 
[   30.065416][    C0] RIP: 0033:0x7ff910944825
[ 30.065571][ C0] Code: 00 00 00 4c 8d 34 82 4c 8b bc 24 c8 00 00 00 4c 89 64 24 40 49 89 fc eb 11 0f 1f 40 00 49 83 c6 04 83 e2 01 0f 85 2b 06 00 00 <41> 8b 06 48 89 c2 4c 31 e0 48 d1 e8 75 e5 48 83 ec 08 4c 89 f0 48
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	00 4c 8d 34          	add    %cl,0x34(%rbp,%rcx,4)
   6:	82                   	(bad)
   7:	4c 8b bc 24 c8 00 00 	mov    0xc8(%rsp),%r15
   e:	00 
   f:	4c 89 64 24 40       	mov    %r12,0x40(%rsp)
  14:	49 89 fc             	mov    %rdi,%r12
  17:	eb 11                	jmp    0x2a
  19:	0f 1f 40 00          	nopl   0x0(%rax)
  1d:	49 83 c6 04          	add    $0x4,%r14
  21:	83 e2 01             	and    $0x1,%edx
  24:	0f 85 2b 06 00 00    	jne    0x655
  2a:*	41 8b 06             	mov    (%r14),%eax		<-- trapping instruction
  2d:	48 89 c2             	mov    %rax,%rdx
  30:	4c 31 e0             	xor    %r12,%rax
  33:	48 d1 e8             	shr    %rax
  36:	75 e5                	jne    0x1d
  38:	48 83 ec 08          	sub    $0x8,%rsp
  3c:	4c 89 f0             	mov    %r14,%rax
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	41 8b 06             	mov    (%r14),%eax
   3:	48 89 c2             	mov    %rax,%rdx
   6:	4c 31 e0             	xor    %r12,%rax
   9:	48 d1 e8             	shr    %rax
   c:	75 e5                	jne    0xfffffffffffffff3
   e:	48 83 ec 08          	sub    $0x8,%rsp
  12:	4c 89 f0             	mov    %r14,%rax
  15:	48                   	rex.W
[   30.066239][    C0] RSP: 002b:00007ffd037b49e0 EFLAGS: 00010206
[   30.066433][    C0] RAX: 000000000000045c RBX: 00007ff9106d0ab0 RCX: 0000000000000407
[   30.066663][    C0] RDX: 00007ff9105db528 RSI: 0000000000000001 RDI: 00000000cf6be145
[   30.066995][    C0] RBP: 00007ff9105dc940 R08: 0000000000000001 R09: 00007ff91096c4e0
[   30.067231][    C0] R10: 00007ff9105b46d0 R11: 00007ff9105dc940 R12: 00000000cf6be145


Finger prints:
asm_exc_page_fault:dump_stack_lvl:mark_lock_irq:mark_lock