======================================
| [ 13.176743][ C3] #1: ffffc900007e7d40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:3214) 
| [ 13.177210][ C3] #2: ffffffff9bd793c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   13.177573][    C3]
| [   13.177573][    C3] stack backtrace:
[   13.177830][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.177832][    C3] Workqueue: events_unbound call_usermodehelper_exec_work
[   13.177842][    C3] Call Trace:
[   13.177845][    C3]  <IRQ>
[ 13.177847][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.177854][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 13.177859][ C3] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 13.177865][ C3] mark_lock (kernel/locking/lockdep.c:4756) 
[ 13.177869][ C3] mark_usage (kernel/locking/lockdep.c:4645) 
[ 13.177872][ C3] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 13.177874][ C3] ? unwind_next_frame (./include/linux/rcupdate.h:874 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 13.177882][ C3] ? copy_process (kernel/fork.c:2166) 
[ 13.177887][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 13.177890][ C3] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 13.177893][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.177896][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 13.177899][ C3] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 13.177903][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.177906][ C3] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 13.177908][ C3] xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 13.177911][ C3] ? __pfx_xa_set_mark (lib/xarray.c:2144) 
[ 13.177914][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 13.177919][ C3] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 13.177924][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:54 lib/ref_tracker.c:223) 
[ 13.177930][ C3] ? mark_held_locks (kernel/locking/lockdep.c:4328) 
[ 13.177932][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.177936][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:213) 
[ 13.177941][ C3] ? ref_tracker_free (lib/ref_tracker.c:281) 
[ 13.177944][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 13.177947][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:281) 
[ 13.177950][ C3] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2368) 
[ 13.177956][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 13.177959][ C3] ? rcu_core (kernel/rcu/tree.c:2834) 
[ 13.177963][ C3] ? handle_softirqs (kernel/softirq.c:580) 
[ 13.177967][ C3] __put_net (./include/linux/llist.h:238 ./include/linux/llist.h:265 net/core/net_namespace.c:732) 
[ 13.177972][ C3] ? kmem_cache_alloc_noprof (mm/slub.c:4024 mm/slub.c:4185 mm/slub.c:4204) 
[ 13.177978][ C3] ? __pfx___put_net (net/core/net_namespace.c:729) 
[ 13.177983][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 13.177988][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2368) 
[ 13.177992][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.177995][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2578) 
[ 13.178000][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 13.178004][ C3] ? mark_held_locks (kernel/locking/lockdep.c:4328) 
[ 13.178007][ C3] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 13.178010][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 13.178016][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 13.178019][ C3] handle_softirqs (kernel/softirq.c:580) 
[ 13.178023][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.178026][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.178028][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   13.178032][    C3]  </IRQ>
[   13.178033][    C3]  <TASK>
[ 13.178034][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.178039][ C3] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.178042][ C3] Code: 74 24 10 e8 81 d8 7e fd 48 89 ef e8 39 2b 7f fd 81 e3 00 02 00 00 75 29 9c 58 f6 c4 02 75 35 48 85 db 74 01 fb bf 01 00 00 00 <e8> fa e8 72 fd 65 8b 05 53 fb b4 02 85 c0 74 0e 5b 5d c3 cc cc cc
All code
========
   0:	74 24                	je     0x26
   2:	10 e8                	adc    %ch,%al
   4:	81 d8 7e fd 48 89    	sbb    $0x8948fd7e,%eax
   a:	ef                   	out    %eax,(%dx)
   b:	e8 39 2b 7f fd       	call   0xfffffffffd7f2b49
  10:	81 e3 00 02 00 00    	and    $0x200,%ebx
  16:	75 29                	jne    0x41
  18:	9c                   	pushf
  19:	58                   	pop    %rax
  1a:	f6 c4 02             	test   $0x2,%ah
  1d:	75 35                	jne    0x54
  1f:	48 85 db             	test   %rbx,%rbx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
  2a:*	e8 fa e8 72 fd       	call   0xfffffffffd72e929		<-- trapping instruction
  2f:	65 8b 05 53 fb b4 02 	mov    %gs:0x2b4fb53(%rip),%eax        # 0x2b4fb89
  36:	85 c0                	test   %eax,%eax
  38:	74 0e                	je     0x48
  3a:	5b                   	pop    %rbx
  3b:	5d                   	pop    %rbp
  3c:	c3                   	ret
  3d:	cc                   	int3
  3e:	cc                   	int3
  3f:	cc                   	int3

Code starting with the faulting instruction
===========================================
   0:	e8 fa e8 72 fd       	call   0xfffffffffd72e8ff
   5:	65 8b 05 53 fb b4 02 	mov    %gs:0x2b4fb53(%rip),%eax        # 0x2b4fb5f
   c:	85 c0                	test   %eax,%eax
   e:	74 0e                	je     0x1e
  10:	5b                   	pop    %rbx
  11:	5d                   	pop    %rbp
  12:	c3                   	ret
  13:	cc                   	int3
  14:	cc                   	int3
  15:	cc                   	int3
[   13.178045][    C3] RSP: 0018:ffffc900007e7708 EFLAGS: 00000206
[   13.178048][    C3] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 0000000000000040
[   13.178050][    C3] RDX: 0000000000000000 RSI: ffffffff9b8a76e1 RDI: 0000000000000001
[   13.178052][    C3] RBP: ffff8880010bd580 R08: 0000000000000001 R09: 0000000000000001
[   13.178053][    C3] R10: ffffffff9c7f75d7 R11: ffff8880010bd598 R12: ffff8880010bd580
[   13.178055][    C3] R13: ffffea0000231800 R14: ffff88800197e640 R15: ffff888008c62f80
[ 13.178061][ C3] get_partial_node.part.0 (mm/slub.c:2903) 
[ 13.178066][ C3] ___slab_alloc (mm/slub.c:2864 mm/slub.c:2981 mm/slub.c:3839) 
[ 13.178069][ C3] ? copy_signal (kernel/fork.c:1648 (discriminator 2)) 
[ 13.178074][ C3] ? copy_signal (kernel/fork.c:1648 (discriminator 2)) 
[ 13.178076][ C3] __slab_alloc.constprop.0 (mm/slub.c:3949) 
[ 13.178080][ C3] ? copy_signal (kernel/fork.c:1648 (discriminator 2)) 
[ 13.178082][ C3] kmem_cache_alloc_noprof (mm/slub.c:4024 mm/slub.c:4185 mm/slub.c:4204) 
[ 13.178086][ C3] copy_signal (kernel/fork.c:1648 (discriminator 2)) 
[ 13.178089][ C3] copy_process (kernel/fork.c:2166) 
[ 13.178095][ C3] ? __pfx_copy_process (kernel/fork.c:1918) 
[ 13.178098][ C3] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 13.178104][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 13.178108][ C3] kernel_clone (./include/linux/random.h:26 kernel/fork.c:2600) 
[ 13.178112][ C3] ? __pfx_kernel_clone (kernel/fork.c:2559) 
[ 13.178115][ C3] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 13.178117][ C3] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 13.178121][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 13.178125][ C3] user_mode_thread (kernel/fork.c:2668) 
[ 13.178128][ C3] ? __pfx_user_mode_thread (kernel/fork.c:2668) 
[ 13.178134][ C3] ? __pfx_call_usermodehelper_exec_async (kernel/umh.c:64) 
[ 13.178138][ C3] ? __pfx_kernel_sigaction (kernel/signal.c:4276) 
[ 13.178143][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.178147][ C3] call_usermodehelper_exec_work (kernel/umh.c:132 kernel/umh.c:163) 
[ 13.178152][ C3] process_one_work (kernel/workqueue.c:3243) 
[ 13.178158][ C3] ? __pfx_process_one_work (kernel/workqueue.c:3140) 
[ 13.178164][ C3] ? assign_work (kernel/workqueue.c:1200) 
[ 13.178168][ C3] worker_thread (kernel/workqueue.c:3315 kernel/workqueue.c:3402) 
[ 13.178174][ C3] ? __pfx_worker_thread (kernel/workqueue.c:3348) 
[ 13.178178][ C3] kthread (kernel/kthread.c:464) 
[ 13.178183][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.178186][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 13.178189][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 13.178191][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.178194][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 13.178198][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 13.178200][ C3] ? __pfx_kthread (kernel/kthread.c:413) 


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