======================================
| [ 1106.664876][    C0]  #6: ffffffffb8b8bda0 (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))
| [ 1106.665041][    C0]  #7: ffffffffb8b8bc80 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:300 (discriminator 2) kernel/rcu/tree.c:2611 (discriminator 2))
| [ 1106.665204][    C0]
| [ 1106.665204][    C0] stack backtrace:
[ 1106.665324][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1106.665326][    C0] Workqueue: netns cleanup_net
[ 1106.665329][    C0] Call Trace:
[ 1106.665330][    C0]  <IRQ>
[ 1106.665332][    C0]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[ 1106.665337][    C0]  print_usage_bug.part.0.cold (kernel/locking/lockdep.c:4042)
[ 1106.665339][    C0]  ? filter_irq_stacks (kernel/stacktrace.c:402)
[ 1106.665343][    C0]  mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4056 kernel/locking/lockdep.c:4267)
[ 1106.665344][    C0]  ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[ 1106.665346][    C0]  ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:697)
[ 1106.665347][    C0]  ? save_trace (kernel/locking/lockdep.c:589)
[ 1106.665349][    C0]  ? read_from_oldmem (fs/proc/vmcore.c:226)
[ 1106.665351][    C0]  mark_lock (kernel/locking/lockdep.c:4753)
[ 1106.665353][    C0]  mark_usage (kernel/locking/lockdep.c:4642)
[ 1106.665354][    C0]  __lock_acquire (kernel/locking/lockdep.c:5191)
[ 1106.665356][    C0]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[ 1106.665357][    C0]  ? rcu_do_batch (./include/linux/rcupdate.h:310 (discriminator 2) kernel/rcu/tree.c:2619 (discriminator 2))
[ 1106.665359][    C0]  lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 1106.665361][    C0]  ? tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[ 1106.665363][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1106.665365][    C0]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[ 1106.665367][    C0]  _raw_spin_lock (./include/linux/spinlock_api_smp.h:158 (discriminator 1) kernel/locking/spinlock.c:158 (discriminator 1))
[ 1106.665368][    C0]  ? tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[ 1106.665369][    C0] tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[ 1106.665371][    C0]  tcf_action_rcu_free (net/sched/act_api.c:367 net/sched/act_api.c:378)
[ 1106.665372][    C0]  ? rcu_do_batch (./include/linux/rcupdate.h:310 (discriminator 2) kernel/rcu/tree.c:2619 (discriminator 2))
[ 1106.665374][    C0]  rcu_do_batch (kernel/rcu/tree.c:2617)
[ 1106.665377][    C0]  ? trace_rcu_batch_end (./include/trace/events/rcu.h:714 (discriminator 19))
[ 1106.665379][    C0]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[ 1106.665380][    C0]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[ 1106.665381][    C0]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[ 1106.665383][    C0]  rcu_core (kernel/rcu/tree.c:2869)
[ 1106.665384][    C0]  handle_softirqs (kernel/softirq.c:622)
[ 1106.665386][    C0]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1106.665388][    C0]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1106.665389][    C0]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[ 1106.665391][    C0]  __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)
[ 1106.665392][    C0]  irq_exit_rcu (kernel/softirq.c:752)
[ 1106.665394][    C0]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[ 1106.665395][    C0]  </IRQ>
[ 1106.665396][    C0]  <TASK>
[ 1106.665397][    C0]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:697)
[ 1106.665398][    C0] RIP: 0010:lock_acquire.part.0 (./arch/x86/include/asm/irqflags.h:158 (discriminator 1) kernel/locking/lockdep.c:5871 (discriminator 1))
[ 1106.665400][    C0] Code: ff 65 0f c1 05 f7 56 c1 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 69 10 c1 04 0f 85 43 01 00 00 48 83 c4
All code
========
   0:	ff 65 0f             	jmp    *0xf(%rbp)
   3:	c1 05 f7 56 c1 04 83 	roll   $0x83,0x4c156f7(%rip)        # 0x4c15701
   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 69 10 c1 	sub    %gs:0x4c11069(%rip),%rax        # 0x4c110a0
  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 69 10 c1 	sub    %gs:0x4c11069(%rip),%rax        # 0x4c11076
   c:	04 
   d:	0f 85 43 01 00 00    	jne    0x156
  13:	48                   	rex.W
  14:	83                   	.byte 0x83
  15:	c4                   	.byte 0xc4
[ 1106.665402][    C0] RSP: 0018:ffa00000000c7108 EFLAGS: 00000206
[ 1106.665404][    C0] RAX: 0000000000000046 RBX: 0000000000000000 RCX: ffa56a8a55738f1b
[ 1106.665405][    C0] RDX: 0000000000000001 RSI: ffffffffb807e08a RDI: ffffffffb7a727c0
[ 1106.665406][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ff11000001aed220
[ 1106.665407][    C0] R10: 0000000000000200 R11: 0000000000000001 R12: ffffffffb8b8bda0
[ 1106.665408][    C0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
[ 1106.665410][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1106.665412][    C0]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[ 1106.665413][    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))
[ 1106.665415][    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))
[ 1106.665416][    C0]  ? __unwind_start (arch/x86/kernel/unwind_orc.c:741)
[ 1106.665417][    C0]  ? 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))
[ 1106.665419][    C0]  ? stack_access_ok (./arch/x86/include/asm/stacktrace.h:55)
[ 1106.665421][    C0]  ? get_stack_info_noinstr (arch/x86/kernel/dumpstack_64.c:173)
[ 1106.665423][    C0]  __unwind_start (arch/x86/kernel/unwind_orc.c:787)
[ 1106.665424][    C0]  ? write_profile (profile.c:?)
[ 1106.665426][    C0]  arch_stack_walk (./arch/x86/include/asm/unwind.h:64 arch/x86/kernel/stacktrace.c:24)
[ 1106.665430][    C0]  ? __unwind_start (arch/x86/kernel/unwind_orc.c:741)
[ 1106.665432][    C0]  stack_trace_save (kernel/stacktrace.c:122 (discriminator 1))
[ 1106.665434][    C0]  ? filter_irq_stacks (kernel/stacktrace.c:402)
[ 1106.665436][    C0]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[ 1106.665438][    C0]  kasan_save_stack (mm/kasan/common.c:57)
[ 1106.665444][    C0]  kasan_record_aux_stack (mm/kasan/generic.c:556)
[ 1106.665446][    C0]  ? kernfs_vfs_xattr_set (inode.c:?)
[ 1106.665448][    C0]  __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3131)
[ 1106.665449][    C0]  ? do_raw_spin_unlock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:32 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141)
[ 1106.665451][    C0]  kernfs_put.part.0 (fs/kernfs/dir.c:618)
[ 1106.665453][    C0]  kernfs_remove_by_name_ns (fs/kernfs/dir.c:592 fs/kernfs/dir.c:1799)
[ 1106.665455][    C0]  remove_files (./include/linux/kernfs.h:639 fs/sysfs/group.c:28)
[ 1106.665457][    C0]  sysfs_remove_group (fs/sysfs/group.c:328)
[ 1106.665459][    C0]  sysfs_remove_groups (fs/sysfs/group.c:352 fs/sysfs/group.c:344)
[ 1106.665461][    C0]  device_remove_attrs (drivers/base/core.c:2844 drivers/base/core.c:2980)
[ 1106.665464][    C0]  ? device_remove_file (drivers/base/core.c:3073)
[ 1106.665467][    C0]  ? kernfs_remove_by_name_ns (fs/kernfs/dir.c:1803)
[ 1106.665469][    C0]  device_del (drivers/base/core.c:3894)
[ 1106.665470][    C0]  ? __device_link_del (./include/linux/kobject.h:89)
[ 1106.665472][    C0]  unregister_netdevice_many_notify (net/core/dev.c:12479)
[ 1106.665475][    C0]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[ 1106.665477][    C0]  ? mutex_is_locked (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:3188 kernel/locking/mutex.h:48 kernel/locking/mutex.c:65)
[ 1106.665479][    C0]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[ 1106.665481][    C0]  ? unregister_netdevice_queue (net/core/dev.c:12311 (discriminator 1))
[ 1106.665484][    C0]  default_device_exit_batch (net/core/dev.c:12507 net/core/dev.c:13099)
[ 1106.665486][    C0]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[ 1106.665488][    C0]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[ 1106.665491][    C0]  ? fou_exit_net (net/ipv4/fou_core.c:1228)
[ 1106.665495][    C0]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[ 1106.665497][    C0]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[ 1106.665498][    C0]  ? netns_install (./include/linux/ns_common.h:26)
[ 1106.665499][    C0]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1106.665501][    C0]  ? idr_destroy (lib/radix-tree.c:310 lib/radix-tree.c:674 lib/radix-tree.c:1563)
[ 1106.665503][    C0]  cleanup_net (net/core/net_namespace.c:702)
[ 1106.665505][    C0]  ? net_passive_dec (./include/linux/llist.h:241)
[ 1106.665506][    C0]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[ 1106.665508][    C0]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[ 1106.665510][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1106.665512][    C0]  process_one_work (kernel/workqueue.c:3314)
[ 1106.665514][    C0]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[ 1106.665516][    C0]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 1106.665518][    C0]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[ 1106.665522][    C0]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[ 1106.665523][    C0]  kthread (kernel/kthread.c:436)
[ 1106.665525][    C0]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[ 1106.665528][    C0]  ? kthread_affine_node (kernel/kthread.c:378)
[ 1106.665530][    C0]  ret_from_fork (arch/x86/kernel/process.c:158)
[ 1106.665532][    C0]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[ 1106.665534][    C0]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[ 1106.665536][    C0]  ? kthread_affine_node (kernel/kthread.c:378)


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