======================================
| [ 1242.073641][    C2]  #3: ffffffffb0b77d20 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame (./include/linux/rcupdate.h:300 (discriminator 2) ./include/linux/rcupdate.h:838 (discriminator 2) ./include/linux/rcupdate.h:1181 (discriminator 2) arch/x86/kernel/unwind_orc.c:495 (discriminator 2))
| [ 1242.073805][    C2]  #4: ffffffffb0b77c00 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:300 (discriminator 2) kernel/rcu/tree.c:2611 (discriminator 2))
| [ 1242.073968][    C2]
| [ 1242.073968][    C2] stack backtrace:
[ 1242.074085][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1242.074087][    C2] Call Trace:
[ 1242.074088][    C2]  <IRQ>
[ 1242.074089][    C2]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[ 1242.074095][    C2]  print_usage_bug.part.0.cold (kernel/locking/lockdep.c:4042)
[ 1242.074097][    C2]  ? filter_irq_stacks (kernel/stacktrace.c:402)
[ 1242.074101][    C2]  mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4056 kernel/locking/lockdep.c:4267)
[ 1242.074103][    C2]  ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[ 1242.074105][    C2]  ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:697)
[ 1242.074107][    C2]  ? save_trace (kernel/locking/lockdep.c:589)
[ 1242.074108][    C2]  ? migrate_vma_insert_page.isra.0 (mm/migrate_device.c:1055)
[ 1242.074113][    C2]  mark_lock (kernel/locking/lockdep.c:4753)
[ 1242.074115][    C2]  mark_usage (kernel/locking/lockdep.c:4642)
[ 1242.074116][    C2]  __lock_acquire (kernel/locking/lockdep.c:5191)
[ 1242.074117][    C2]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[ 1242.074119][    C2]  ? rcu_do_batch (./include/linux/rcupdate.h:310 (discriminator 2) kernel/rcu/tree.c:2619 (discriminator 2))
[ 1242.074121][    C2]  lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 1242.074123][    C2]  ? tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[ 1242.074125][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1242.074127][    C2]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[ 1242.074129][    C2]  _raw_spin_lock (./include/linux/spinlock_api_smp.h:158 (discriminator 1) kernel/locking/spinlock.c:158 (discriminator 1))
[ 1242.074131][    C2]  ? tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[ 1242.074132][    C2] tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[ 1242.074134][    C2]  tcf_action_rcu_free (net/sched/act_api.c:367 net/sched/act_api.c:378)
[ 1242.074135][    C2]  ? rcu_do_batch (./include/linux/rcupdate.h:310 (discriminator 2) kernel/rcu/tree.c:2619 (discriminator 2))
[ 1242.074137][    C2]  rcu_do_batch (kernel/rcu/tree.c:2617)
[ 1242.074140][    C2]  ? trace_rcu_batch_end (./include/trace/events/rcu.h:714 (discriminator 19))
[ 1242.074142][    C2]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[ 1242.074143][    C2]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[ 1242.074145][    C2]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:178 (discriminator 6) kernel/locking/spinlock.c:198 (discriminator 6))
[ 1242.074146][    C2]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:179 (discriminator 1) kernel/locking/spinlock.c:198 (discriminator 1))
[ 1242.074148][    C2]  rcu_core (kernel/rcu/tree.c:2869)
[ 1242.074150][    C2]  handle_softirqs (kernel/softirq.c:622)
[ 1242.074151][    C2]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1242.074154][    C2]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1242.074155][    C2]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[ 1242.074158][    C2]  __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)
[ 1242.074159][    C2]  irq_exit_rcu (kernel/softirq.c:752)
[ 1242.074160][    C2]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[ 1242.074162][    C2]  </IRQ>
[ 1242.074163][    C2]  <TASK>
[ 1242.074163][    C2]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:697)
[ 1242.074165][    C2] RIP: 0010:lock_release (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/locking/lockdep.c:5885 kernel/locking/lockdep.c:5875)
[ 1242.074168][    C2] Code: 85 d2 0f 85 84 00 00 00 65 48 8b 05 c0 8b 33 04 8b 80 ec 0a 00 00 85 c0 75 72 48 81 3b a0 1d cc b1 74 69 4c 89 7c 24 18 9c 58 <49> 89 c7 fa 48 c7 c7 cd 44 63 b0 e8 46 16 33 02 4c 89 f6 48 89 df
All code
========
   0:	85 d2                	test   %edx,%edx
   2:	0f 85 84 00 00 00    	jne    0x8c
   8:	65 48 8b 05 c0 8b 33 	mov    %gs:0x4338bc0(%rip),%rax        # 0x4338bd0
   f:	04 
  10:	8b 80 ec 0a 00 00    	mov    0xaec(%rax),%eax
  16:	85 c0                	test   %eax,%eax
  18:	75 72                	jne    0x8c
  1a:	48 81 3b a0 1d cc b1 	cmpq   $0xffffffffb1cc1da0,(%rbx)
  21:	74 69                	je     0x8c
  23:	4c 89 7c 24 18       	mov    %r15,0x18(%rsp)
  28:	9c                   	pushf
  29:	58                   	pop    %rax
  2a:*	49 89 c7             	mov    %rax,%r15		<-- trapping instruction
  2d:	fa                   	cli
  2e:	48 c7 c7 cd 44 63 b0 	mov    $0xffffffffb06344cd,%rdi
  35:	e8 46 16 33 02       	call   0x2331680
  3a:	4c 89 f6             	mov    %r14,%rsi
  3d:	48 89 df             	mov    %rbx,%rdi

Code starting with the faulting instruction
===========================================
   0:	49 89 c7             	mov    %rax,%r15
   3:	fa                   	cli
   4:	48 c7 c7 cd 44 63 b0 	mov    $0xffffffffb06344cd,%rdi
   b:	e8 46 16 33 02       	call   0x2331656
  10:	4c 89 f6             	mov    %r14,%rsi
  13:	48 89 df             	mov    %rbx,%rdi
[ 1242.074169][    C2] RSP: 0018:ffa0000002167310 EFLAGS: 00000202
[ 1242.074171][    C2] RAX: 0000000000000202 RBX: ffffffffb0b77d20 RCX: 0000000000000001
[ 1242.074172][    C2] RDX: 0000000000000000 RSI: ffffffffb006f640 RDI: ffffffffb069e950
[ 1242.074173][    C2] RBP: ffa00000021677c0 R08: ffffffffb178bb48 R09: ffffffffb1547e9c
[ 1242.074174][    C2] R10: 0000000000000002 R11: 0000000000000011 R12: ffa0000002167701
[ 1242.074175][    C2] R13: ffa0000002167438 R14: ffffffffad74a6e1 R15: 0000000000000000
[ 1242.074176][    C2]  ? unwind_next_frame (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) ./include/linux/rcupdate.h:1181 (discriminator 2) arch/x86/kernel/unwind_orc.c:495 (discriminator 2))
[ 1242.074179][    C2]  unwind_next_frame (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) ./include/linux/rcupdate.h:1181 (discriminator 2) arch/x86/kernel/unwind_orc.c:495 (discriminator 2))
[ 1242.074180][    C2]  ? __kasan_slab_alloc (mm/kasan/common.c:340 mm/kasan/common.c:366)
[ 1242.074182][    C2]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1242.074183][    C2]  ? stack_access_ok (./arch/x86/include/asm/stacktrace.h:55)
[ 1242.074185][    C2]  ? __unwind_start (arch/x86/kernel/unwind_orc.c:787)
[ 1242.074187][    C2]  ? write_profile (profile.c:?)
[ 1242.074188][    C2]  arch_stack_walk (arch/x86/kernel/stacktrace.c:25)
[ 1242.074192][    C2]  ? kmem_cache_alloc_noprof (./include/linux/kasan.h:253 mm/slub.c:4570 mm/slub.c:4899 mm/slub.c:4906)
[ 1242.074196][    C2]  stack_trace_save (kernel/stacktrace.c:122 (discriminator 1))
[ 1242.074198][    C2]  ? filter_irq_stacks (kernel/stacktrace.c:402)
[ 1242.074200][    C2]  kasan_save_stack (mm/kasan/common.c:57)
[ 1242.074203][    C2]  ? kasan_save_stack (mm/kasan/common.c:57)
[ 1242.074204][    C2]  ? kasan_save_track (mm/kasan/common.c:78)
[ 1242.074206][    C2]  ? __kasan_slab_alloc (mm/kasan/common.c:340 mm/kasan/common.c:366)
[ 1242.074211][    C2]  kasan_save_track (mm/kasan/common.c:78)
[ 1242.074213][    C2]  __kasan_slab_alloc (mm/kasan/common.c:340 mm/kasan/common.c:366)
[ 1242.074214][    C2]  kmem_cache_alloc_noprof (./include/linux/kasan.h:253 mm/slub.c:4570 mm/slub.c:4899 mm/slub.c:4906)
[ 1242.074216][    C2]  __alloc_object (mm/kmemleak.c:483 (discriminator 1) mm/kmemleak.c:665 (discriminator 1))
[ 1242.074218][    C2]  __create_object (mm/kmemleak.c:779)
[ 1242.074219][    C2]  ? kasan_save_track (mm/kasan/common.c:78)
[ 1242.074221][    C2]  kmem_cache_alloc_noprof (./include/linux/kmemleak.h:44 mm/slub.c:4575 mm/slub.c:4899 mm/slub.c:4906)
[ 1242.074223][    C2]  ? __vma_start_exclude_readers (./arch/x86/include/asm/bitops.h:202 (discriminator 1) ./arch/x86/include/asm/bitops.h:232 (discriminator 1) ./include/asm-generic/bitops/instrumented-non-atomic.h:142 (discriminator 1) ./include/linux/thread_info.h:133 (discriminator 1) ./include/linux/sched.h:2069 (discriminator 1) ./include/linux/sched/signal.h:394 (discriminator 1) ./include/linux/sched/signal.h:413 (discriminator 1) mm/mmap_lock.c:126 (discriminator 1))
[ 1242.074227][    C2]  vm_area_dup (mm/vma_init.c:123 (discriminator 7))
[ 1242.074229][    C2]  dup_mmap (mm/mmap.c:1786)
[ 1242.074232][    C2]  ? mmap_read_lock_maybe_expand (./include/linux/rwsem.h:221 (discriminator 1))
[ 1242.074234][    C2]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1242.074235][    C2]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[ 1242.074237][    C2]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[ 1242.074238][    C2]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 1242.074239][    C2]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1242.074242][    C2]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 1242.074243][    C2]  ? copy_process (kernel/fork.c:1533 kernel/fork.c:1586 kernel/fork.c:2264)
[ 1242.074245][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1242.074247][    C2]  copy_process (kernel/fork.c:1534 kernel/fork.c:1586 kernel/fork.c:2264)
[ 1242.074249][    C2]  ? restore_fpregs_from_user (arch/x86/kernel/fpu/signal.c:300)
[ 1242.074252][    C2]  ? pidfd_prepare (./include/linux/list.h:1021 (discriminator 3))
[ 1242.074254][    C2]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4040 (discriminator 3) kernel/rcu/tree.c:4032 (discriminator 3))
[ 1242.074256][    C2]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4040 (discriminator 3) kernel/rcu/tree.c:4032 (discriminator 3))
[ 1242.074257][    C2]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[ 1242.074259][    C2]  kernel_clone (kernel/fork.c:2722)
[ 1242.074261][    C2]  ? create_io_thread (kernel/fork.c:2660)
[ 1242.074263][    C2]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[ 1242.074264][    C2]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1242.074267][    C2]  __do_sys_clone (kernel/fork.c:2863)
[ 1242.074268][    C2]  ? kernel_clone (./include/trace/events/sched.h:396 (discriminator 19))
[ 1242.074271][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1242.074273][    C2]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[ 1242.074276][    C2]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[ 1242.074277][    C2]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[ 1242.074279][    C2]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[ 1242.074280][    C2]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[ 1242.074282][    C2] RIP: 0033:0x7fa7b3ce3226
[ 1242.074284][    C2] Code: 7d e0 e8 7d a4 f5 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5a 89 c3 85 c0 75 2f 64 48 8b 04 25 10 00 00
All code
========
   0:	7d e0                	jge    0xffffffffffffffe2
   2:	e8 7d a4 f5 ff       	call   0xfffffffffff5a484
   7:	45 31 c0             	xor    %r8d,%r8d
   a:	31 d2                	xor    %edx,%edx
   c:	31 f6                	xor    %esi,%esi
   e:	64 48 8b 04 25 10 00 	mov    %fs:0x10,%rax
  15:	00 00 
  17:	bf 11 00 20 01       	mov    $0x1200011,%edi
  1c:	4c 8d 90 d0 02 00 00 	lea    0x2d0(%rax),%r10
  23:	b8 38 00 00 00       	mov    $0x38,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 5a                	ja     0x8c
  32:	89 c3                	mov    %eax,%ebx
  34:	85 c0                	test   %eax,%eax
  36:	75 2f                	jne    0x67
  38:	64                   	fs
  39:	48                   	rex.W
  3a:	8b                   	.byte 0x8b
  3b:	04 25                	add    $0x25,%al
  3d:	10 00                	adc    %al,(%rax)
	...

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 5a                	ja     0x62
   8:	89 c3                	mov    %eax,%ebx
   a:	85 c0                	test   %eax,%eax
   c:	75 2f                	jne    0x3d
   e:	64                   	fs
   f:	48                   	rex.W
  10:	8b                   	.byte 0x8b
  11:	04 25                	add    $0x25,%al
  13:	10 00                	adc    %al,(%rax)
	...
[ 1242.074285][    C2] RSP: 002b:00007ffdb472ea90 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
[ 1242.074286][    C2] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fa7b3ce3226
[ 1242.074287][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
[ 1242.074288][    C2] RBP: 00007ffdb472eab0 R08: 0000000000000000 R09: 0000000000000030
[ 1242.074289][    C2] R10: 00007fa7b3c20e50 R11: 0000000000000246 R12: 000055a158e21650


Finger prints:
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock