======================================
| [   23.227032][    C0]  #3: ffffffffaa577d20 (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))
| [   23.227197][    C0]  #4: ffffffffaa577c00 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:300 (discriminator 2) kernel/rcu/tree.c:2611 (discriminator 2))
| [   23.227359][    C0]
| [   23.227359][    C0] stack backtrace:
[   23.227479][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   23.227481][    C0] Call Trace:
[   23.227483][    C0]  <IRQ>
[   23.227484][    C0]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[   23.227489][    C0]  print_usage_bug.part.0.cold (kernel/locking/lockdep.c:4042)
[   23.227492][    C0]  ? filter_irq_stacks (kernel/stacktrace.c:402)
[   23.227495][    C0]  mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4056 kernel/locking/lockdep.c:4267)
[   23.227497][    C0]  ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[   23.227499][    C0]  ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:697)
[   23.227501][    C0]  ? save_trace (kernel/locking/lockdep.c:589)
[   23.227503][    C0]  ? get_user_pages_remote (mm/gup.c:1773 (discriminator 1) mm/gup.c:2614 (discriminator 1))
[   23.227506][    C0]  mark_lock (kernel/locking/lockdep.c:4753)
[   23.227508][    C0]  mark_usage (kernel/locking/lockdep.c:4642)
[   23.227510][    C0]  __lock_acquire (kernel/locking/lockdep.c:5191)
[   23.227511][    C0]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   23.227513][    C0]  ? rcu_do_batch (./include/linux/rcupdate.h:310 (discriminator 2) kernel/rcu/tree.c:2619 (discriminator 2))
[   23.227516][    C0]  lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   23.227517][    C0]  ? tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[   23.227519][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   23.227521][    C0]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   23.227523][    C0]  _raw_spin_lock (./include/linux/spinlock_api_smp.h:158 (discriminator 1) kernel/locking/spinlock.c:158 (discriminator 1))
[   23.227525][    C0]  ? tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[   23.227526][    C0] tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[   23.227528][    C0]  tcf_action_rcu_free (net/sched/act_api.c:367 net/sched/act_api.c:378)
[   23.227529][    C0]  ? rcu_do_batch (./include/linux/rcupdate.h:310 (discriminator 2) kernel/rcu/tree.c:2619 (discriminator 2))
[   23.227531][    C0]  rcu_do_batch (kernel/rcu/tree.c:2617)
[   23.227534][    C0]  ? trace_rcu_batch_end (./include/trace/events/rcu.h:714 (discriminator 19))
[   23.227536][    C0]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   23.227537][    C0]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   23.227539][    C0]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:178 (discriminator 6) kernel/locking/spinlock.c:198 (discriminator 6))
[   23.227540][    C0]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:179 (discriminator 1) kernel/locking/spinlock.c:198 (discriminator 1))
[   23.227542][    C0]  rcu_core (kernel/rcu/tree.c:2869)
[   23.227544][    C0]  handle_softirqs (kernel/softirq.c:622)
[   23.227546][    C0]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.227549][    C0]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   23.227550][    C0]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[   23.227552][    C0]  __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)
[   23.227554][    C0]  irq_exit_rcu (kernel/softirq.c:752)
[   23.227555][    C0]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[   23.227557][    C0]  </IRQ>
[   23.227558][    C0]  <TASK>
[   23.227558][    C0]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:697)
[   23.227560][    C0] RIP: 0010:lock_acquire.part.0 (./arch/x86/include/asm/irqflags.h:158 (discriminator 1) kernel/locking/lockdep.c:5871 (discriminator 1))
[   23.227563][    C0] Code: ff 65 0f c1 05 37 d9 33 04 83 f8 01 4c 8b 14 24 0f 85 30 01 00 00 9c 58 f6 c4 02 0f 85 4d 01 00 00 4d 85 d2 0f 85 16 01 00 00 <48> 8b 44 24 30 65 48 2b 05 a9 92 33 04 0f 85 43 01 00 00 48 83 c4
All code
========
   0:	ff 65 0f             	jmp    *0xf(%rbp)
   3:	c1 05 37 d9 33 04 83 	roll   $0x83,0x433d937(%rip)        # 0x433d941
   a:	f8                   	clc
   b:	01 4c 8b 14          	add    %ecx,0x14(%rbx,%rcx,4)
   f:	24 0f                	and    $0xf,%al
  11:	85 30                	test   %esi,(%rax)
  13:	01 00                	add    %eax,(%rax)
  15:	00 9c 58 f6 c4 02 0f 	add    %bl,0xf02c4f6(%rax,%rbx,2)
  1c:	85 4d 01             	test   %ecx,0x1(%rbp)
  1f:	00 00                	add    %al,(%rax)
  21:	4d 85 d2             	test   %r10,%r10
  24:	0f 85 16 01 00 00    	jne    0x140
  2a:*	48 8b 44 24 30       	mov    0x30(%rsp),%rax		<-- trapping instruction
  2f:	65 48 2b 05 a9 92 33 	sub    %gs:0x43392a9(%rip),%rax        # 0x43392e0
  36:	04 
  37:	0f 85 43 01 00 00    	jne    0x180
  3d:	48                   	rex.W
  3e:	83                   	.byte 0x83
  3f:	c4                   	.byte 0xc4

Code starting with the faulting instruction
===========================================
   0:	48 8b 44 24 30       	mov    0x30(%rsp),%rax
   5:	65 48 2b 05 a9 92 33 	sub    %gs:0x43392a9(%rip),%rax        # 0x43392b6
   c:	04 
   d:	0f 85 43 01 00 00    	jne    0x156
  13:	48                   	rex.W
  14:	83                   	.byte 0x83
  15:	c4                   	.byte 0xc4
[   23.227564][    C0] RSP: 0018:ffa0000000857460 EFLAGS: 00000206
[   23.227567][    C0] RAX: 0000000000000046 RBX: 0000000000000000 RCX: 32774272f7e67d87
[   23.227568][    C0] RDX: 0000000000000001 RSI: ffffffffa9febde8 RDI: ffffffffa9a6f6c0
[   23.227569][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ff1100000ca351a8
[   23.227570][    C0] R10: 0000000000000200 R11: 0000000000000001 R12: ffffffffaa577d20
[   23.227570][    C0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
[   23.227573][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   23.227574][    C0]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   23.227576][    C0]  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))
[   23.227577][    C0]  ? 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))
[   23.227579][    C0]  ? arch_stack_walk (./arch/x86/include/asm/unwind.h:64 arch/x86/kernel/stacktrace.c:24)
[   23.227582][    C0]  ? stack_access_ok (./arch/x86/include/asm/stacktrace.h:55)
[   23.227584][    C0]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   23.227585][    C0]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.227587][    C0]  ? get_stack_info_noinstr (arch/x86/kernel/dumpstack_64.c:173)
[   23.227589][    C0]  __unwind_start (arch/x86/kernel/unwind_orc.c:787)
[   23.227591][    C0]  ? write_profile (profile.c:?)
[   23.227593][    C0]  arch_stack_walk (./arch/x86/include/asm/unwind.h:64 arch/x86/kernel/stacktrace.c:24)
[   23.227595][    C0]  ? arch_stack_walk (./arch/x86/include/asm/unwind.h:64 arch/x86/kernel/stacktrace.c:24)
[   23.227598][    C0]  stack_trace_save (kernel/stacktrace.c:122 (discriminator 1))
[   23.227600][    C0]  ? filter_irq_stacks (kernel/stacktrace.c:402)
[   23.227602][    C0]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   23.227603][    C0]  ? check_object (mm/slub.c:1407 (discriminator 1) mm/slub.c:1514 (discriminator 1))
[   23.227606][    C0]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   23.227607][    C0]  set_track_prepare (mm/slub.c:1037)
[   23.227610][    C0]  ___slab_alloc (mm/slub.c:1067 mm/slub.c:4480)
[   23.227612][    C0]  ? vm_area_dup (mm/vma_init.c:123 (discriminator 7))
[   23.227615][    C0]  ? vm_area_dup (mm/vma_init.c:123 (discriminator 7))
[   23.227616][    C0]  kmem_cache_alloc_noprof (mm/slub.c:4511 mm/slub.c:4887 mm/slub.c:4906)
[   23.227618][    C0]  ? __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))
[   23.227621][    C0]  vm_area_dup (mm/vma_init.c:123 (discriminator 7))
[   23.227623][    C0]  dup_mmap (mm/mmap.c:1786)
[   23.227626][    C0]  ? mmap_read_lock_maybe_expand (./include/linux/rwsem.h:221 (discriminator 1))
[   23.227628][    C0]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.227629][    C0]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[   23.227631][    C0]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[   23.227632][    C0]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   23.227634][    C0]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.227636][    C0]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   23.227638][    C0]  ? copy_process (kernel/fork.c:1533 kernel/fork.c:1586 kernel/fork.c:2264)
[   23.227639][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   23.227642][    C0]  copy_process (kernel/fork.c:1534 kernel/fork.c:1586 kernel/fork.c:2264)
[   23.227643][    C0]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4040 (discriminator 3) kernel/rcu/tree.c:4032 (discriminator 3))
[   23.227646][    C0]  ? pidfd_prepare (./include/linux/list.h:1021 (discriminator 3))
[   23.227649][    C0]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4040 (discriminator 3) kernel/rcu/tree.c:4032 (discriminator 3))
[   23.227650][    C0]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4040 (discriminator 3) kernel/rcu/tree.c:4032 (discriminator 3))
[   23.227652][    C0]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[   23.227654][    C0]  kernel_clone (kernel/fork.c:2722)
[   23.227655][    C0]  ? create_io_thread (kernel/fork.c:2660)
[   23.227658][    C0]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[   23.227659][    C0]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.227662][    C0]  __do_sys_clone (kernel/fork.c:2863)
[   23.227663][    C0]  ? kernel_clone (./include/trace/events/sched.h:396 (discriminator 19))
[   23.227666][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   23.227668][    C0]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   23.227671][    C0]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   23.227673][    C0]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[   23.227674][    C0]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[   23.227676][    C0]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   23.227677][    C0] RIP: 0033:0x7f246847e226
[   23.227680][    C0] 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)
	...
[   23.227680][    C0] RSP: 002b:00007ffd38253f80 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
[   23.227682][    C0] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f246847e226
[   23.227683][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
[   23.227684][    C0] RBP: 00007ffd38253fa0 R08: 0000000000000000 R09: 0000000000000200
[   23.227685][    C0] R10: 00007f24683bbe50 R11: 0000000000000246 R12: 00007ffd38254720


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