======================================
| [  279.024007][    C0] 1 lock held by br_netfilter_qu/1932:
| [ 279.024194][ C0] #0: ffffffff8b779b40 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [  279.024528][    C0]
| [  279.024528][    C0] stack backtrace:
[  279.024766][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  279.024768][    C0] Call Trace:
[  279.024770][    C0]  <IRQ>
[ 279.024772][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 279.024778][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 279.024783][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 279.024788][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 279.024794][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 279.024798][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 279.024801][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 279.024804][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 279.024809][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 279.024812][ C0] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 279.024815][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 279.024821][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 279.024823][ C0] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 279.024827][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 279.024830][ C0] ? xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 279.024832][ C0] xa_set_mark (lib/xarray.c:2076 lib/xarray.c:2146) 
[ 279.024834][ C0] ? __pfx_xa_set_mark (lib/xarray.c:2144) 
[ 279.024837][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 279.024842][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 279.024846][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:54 lib/ref_tracker.c:223) 
[ 279.024850][ C0] ? trace_kfree (./include/trace/events/kmem.h:94 (discriminator 21)) 
[ 279.024856][ C0] ? kfree (mm/slub.c:4831) 
[ 279.024859][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 279.024863][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:213) 
[ 279.024867][ C0] ? ref_tracker_free (lib/ref_tracker.c:281) 
[ 279.024870][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 279.024873][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:281) 
[ 279.024876][ C0] ? __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) 
[ 279.024882][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 279.024884][ C0] ? rcu_core (kernel/rcu/tree.c:2834) 
[ 279.024889][ C0] ? handle_softirqs (kernel/softirq.c:580) 
[ 279.024893][ C0] __put_net (./include/linux/llist.h:238 ./include/linux/llist.h:265 net/core/net_namespace.c:732) 
[ 279.024899][ C0] ? do_syscall_64 (./include/linux/entry-common.h:330 ./include/linux/entry-common.h:414 ./include/linux/entry-common.h:449 arch/x86/entry/syscall_64.c:100) 
[ 279.024903][ C0] ? __pfx___put_net (net/core/net_namespace.c:729) 
[ 279.024908][ C0] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 279.024914][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2368) 
[ 279.024918][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 279.024920][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 279.024923][ C0] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 279.024927][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 279.024930][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 279.024933][ C0] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 279.024936][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 279.024942][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 279.024945][ C0] handle_softirqs (kernel/softirq.c:580) 
[ 279.024949][ C0] ? copy_fpstate_to_sigframe (./include/linux/bottom_half.h:33 ./arch/x86/include/asm/fpu/api.h:77 arch/x86/kernel/fpu/signal.c:220) 
[ 279.024952][ C0] do_softirq (kernel/softirq.c:480 kernel/softirq.c:467) 
[  279.024955][    C0]  </IRQ>
[  279.024956][    C0]  <TASK>
[ 279.024957][ C0] __local_bh_enable_ip (kernel/softirq.c:407) 
[ 279.024961][ C0] copy_fpstate_to_sigframe (arch/x86/kernel/fpu/signal.c:222) 
[ 279.024964][ C0] ? fpu__alloc_mathframe (arch/x86/kernel/fpu/signal.c:493) 
[ 279.024968][ C0] get_sigframe (arch/x86/kernel/signal.c:163) 
[ 279.024975][ C0] ? __pfx_get_sigframe (arch/x86/kernel/signal.c:96) 
[ 279.024979][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 279.024982][ C0] ? trace_rseq_update (./include/trace/events/rseq.h:11 (discriminator 21)) 
[ 279.024987][ C0] x64_setup_rt_frame (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 arch/x86/kernel/signal_64.c:153 arch/x86/kernel/signal_64.c:176) 
[ 279.024992][ C0] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:425) 
[ 279.024996][ C0] ? __pfx_x64_setup_rt_frame (arch/x86/kernel/signal_64.c:165) 
[ 279.024999][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 279.025002][ C0] ? _raw_spin_unlock_irq (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 ./include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202) 
[ 279.025007][ C0] handle_signal (arch/x86/kernel/signal.c:250 arch/x86/kernel/signal.c:294) 
[ 279.025011][ C0] arch_do_signal_or_restart (arch/x86/kernel/signal.c:340) 
[ 279.025014][ C0] ? __pfx_arch_do_signal_or_restart (arch/x86/kernel/signal.c:334) 
[ 279.025020][ C0] ? audit_reset_context.part.0.constprop.0 (./include/linux/list.h:373 kernel/auditsc.c:1025) 
[ 279.025025][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 279.025029][ C0] exit_to_user_mode_loop (kernel/entry/common.c:113) 
[ 279.025034][ C0] do_syscall_64 (./include/linux/entry-common.h:330 ./include/linux/entry-common.h:414 ./include/linux/entry-common.h:449 arch/x86/entry/syscall_64.c:100) 
[ 279.025038][ C0] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  279.025042][    C0] RIP: 0033:0x7f8b91f3183b
[ 279.025047][ C0] Code: 48 85 f6 74 15 48 b9 00 00 00 80 01 00 00 00 48 8b 06 48 85 c8 75 48 49 89 f0 41 ba 08 00 00 00 4c 89 c6 b8 0e 00 00 00 0f 05 <89> c2 f7 da 3d 00 f0 ff ff b8 00 00 00 00 0f 47 c2 48 8b 94 24 88
All code
========
   0:	48 85 f6             	test   %rsi,%rsi
   3:	74 15                	je     0x1a
   5:	48 b9 00 00 00 80 01 	movabs $0x180000000,%rcx
   c:	00 00 00 
   f:	48 8b 06             	mov    (%rsi),%rax
  12:	48 85 c8             	test   %rcx,%rax
  15:	75 48                	jne    0x5f
  17:	49 89 f0             	mov    %rsi,%r8
  1a:	41 ba 08 00 00 00    	mov    $0x8,%r10d
  20:	4c 89 c6             	mov    %r8,%rsi
  23:	b8 0e 00 00 00       	mov    $0xe,%eax
  28:	0f 05                	syscall
  2a:*	89 c2                	mov    %eax,%edx		<-- trapping instruction
  2c:	f7 da                	neg    %edx
  2e:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
  33:	b8 00 00 00 00       	mov    $0x0,%eax
  38:	0f 47 c2             	cmova  %edx,%eax
  3b:	48                   	rex.W
  3c:	8b                   	.byte 0x8b
  3d:	94                   	xchg   %eax,%esp
  3e:	24 88                	and    $0x88,%al

Code starting with the faulting instruction
===========================================
   0:	89 c2                	mov    %eax,%edx
   2:	f7 da                	neg    %edx
   4:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
   9:	b8 00 00 00 00       	mov    $0x0,%eax
   e:	0f 47 c2             	cmova  %edx,%eax
  11:	48                   	rex.W
  12:	8b                   	.byte 0x8b
  13:	94                   	xchg   %eax,%esp
  14:	24 88                	and    $0x88,%al
[  279.025049][    C0] RSP: 002b:00007ffd596be2d0 EFLAGS: 00000246 ORIG_RAX: 000000000000000e
[  279.025053][    C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f8b91f3183b
[  279.025055][    C0] RDX: 0000000000000000 RSI: 00007ffd596be390 RDI: 0000000000000002
[  279.025056][    C0] RBP: 0000000000000000 R08: 00007ffd596be390 R09: 0000000000000000
[  279.025058][    C0] R10: 0000000000000008 R11: 0000000000000246 R12: 000056448f335620


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