======================================
| [ 1190.753901][    C3]  #5: ffffffffbb98bda0 (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))
| [ 1190.754057][    C3]  #6: ffffffffbb98bc80 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:300 (discriminator 2) kernel/rcu/tree.c:2611 (discriminator 2))
| [ 1190.754232][    C3]
| [ 1190.754232][    C3] stack backtrace:
[ 1190.754353][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1190.754355][    C3] Workqueue: netns cleanup_net
[ 1190.754358][    C3] Call Trace:
[ 1190.754360][    C3]  <IRQ>
[ 1190.754362][    C3]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[ 1190.754368][    C3]  print_usage_bug.part.0.cold (kernel/locking/lockdep.c:4042)
[ 1190.754371][    C3]  ? filter_irq_stacks (kernel/stacktrace.c:402)
[ 1190.754375][    C3]  mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4056 kernel/locking/lockdep.c:4267)
[ 1190.754377][    C3]  ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[ 1190.754379][    C3]  ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:697)
[ 1190.754381][    C3]  ? save_trace (kernel/locking/lockdep.c:589)
[ 1190.754382][    C3]  ? __skb_to_sgvec (./include/linux/scatterlist.h:137 (discriminator 1) ./include/linux/scatterlist.h:162 (discriminator 1) net/core/skbuff.c:5254 (discriminator 1))
[ 1190.754385][    C3]  mark_lock (kernel/locking/lockdep.c:4753)
[ 1190.754387][    C3]  mark_usage (kernel/locking/lockdep.c:4642)
[ 1190.754388][    C3]  __lock_acquire (kernel/locking/lockdep.c:5191)
[ 1190.754390][    C3]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[ 1190.754391][    C3]  ? rcu_do_batch (./include/linux/rcupdate.h:310 (discriminator 2) kernel/rcu/tree.c:2619 (discriminator 2))
[ 1190.754394][    C3]  lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 1190.754396][    C3]  ? tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[ 1190.754398][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1190.754400][    C3]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[ 1190.754402][    C3]  _raw_spin_lock (./include/linux/spinlock_api_smp.h:158 (discriminator 1) kernel/locking/spinlock.c:158 (discriminator 1))
[ 1190.754403][    C3]  ? tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[ 1190.754405][    C3] tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[ 1190.754407][    C3]  tcf_action_rcu_free (net/sched/act_api.c:367 net/sched/act_api.c:378)
[ 1190.754408][    C3]  ? rcu_do_batch (./include/linux/rcupdate.h:310 (discriminator 2) kernel/rcu/tree.c:2619 (discriminator 2))
[ 1190.754410][    C3]  rcu_do_batch (kernel/rcu/tree.c:2617)
[ 1190.754413][    C3]  ? trace_rcu_batch_end (./include/trace/events/rcu.h:714 (discriminator 19))
[ 1190.754415][    C3]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[ 1190.754416][    C3]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[ 1190.754418][    C3]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[ 1190.754420][    C3]  rcu_core (kernel/rcu/tree.c:2869)
[ 1190.754421][    C3]  handle_softirqs (kernel/softirq.c:622)
[ 1190.754423][    C3]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1190.754426][    C3]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1190.754428][    C3]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[ 1190.754431][    C3]  __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)
[ 1190.754433][    C3]  irq_exit_rcu (kernel/softirq.c:752)
[ 1190.754434][    C3]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1061 (discriminator 37) arch/x86/kernel/apic/apic.c:1061 (discriminator 37))
[ 1190.754436][    C3]  </IRQ>
[ 1190.754436][    C3]  <TASK>
[ 1190.754437][    C3]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:697)
[ 1190.754439][    C3] RIP: 0010:__orc_find (arch/x86/kernel/unwind_orc.c:111)
[ 1190.754441][    C3] Code: e1 07 83 c1 03 40 38 f9 7c 05 40 84 ff 75 30 48 63 0a 48 01 d1 49 39 ca 73 b0 4c 8d 4a fc 4d 39 c1 73 b3 49 29 f3 48 83 c4 30 <49> c1 fb 02 4b 8d 04 5b 48 8d 04 43 5b c3 31 c0 c3 48 89 f0 c3 48
All code
========
   0:	e1 07                	loope  0x9
   2:	83 c1 03             	add    $0x3,%ecx
   5:	40 38 f9             	cmp    %dil,%cl
   8:	7c 05                	jl     0xf
   a:	40 84 ff             	test   %dil,%dil
   d:	75 30                	jne    0x3f
   f:	48 63 0a             	movslq (%rdx),%rcx
  12:	48 01 d1             	add    %rdx,%rcx
  15:	49 39 ca             	cmp    %rcx,%r10
  18:	73 b0                	jae    0xffffffffffffffca
  1a:	4c 8d 4a fc          	lea    -0x4(%rdx),%r9
  1e:	4d 39 c1             	cmp    %r8,%r9
  21:	73 b3                	jae    0xffffffffffffffd6
  23:	49 29 f3             	sub    %rsi,%r11
  26:	48 83 c4 30          	add    $0x30,%rsp
  2a:*	49 c1 fb 02          	sar    $0x2,%r11		<-- trapping instruction
  2e:	4b 8d 04 5b          	lea    (%r11,%r11,2),%rax
  32:	48 8d 04 43          	lea    (%rbx,%rax,2),%rax
  36:	5b                   	pop    %rbx
  37:	c3                   	ret
  38:	31 c0                	xor    %eax,%eax
  3a:	c3                   	ret
  3b:	48 89 f0             	mov    %rsi,%rax
  3e:	c3                   	ret
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	49 c1 fb 02          	sar    $0x2,%r11
   4:	4b 8d 04 5b          	lea    (%r11,%r11,2),%rax
   8:	48 8d 04 43          	lea    (%rbx,%rax,2),%rax
   c:	5b                   	pop    %rbx
   d:	c3                   	ret
   e:	31 c0                	xor    %eax,%eax
  10:	c3                   	ret
  11:	48 89 f0             	mov    %rsi,%rax
  14:	c3                   	ret
  15:	48                   	rex.W
[ 1190.754443][    C3] RSP: 0018:ffa00000004a6d88 EFLAGS: 00000286
[ 1190.754446][    C3] RAX: dffffc0000000000 RBX: ffffffffbc7c2116 RCX: ffffffffb9f6e8ca
[ 1190.754448][    C3] RDX: ffffffffbc4e06a0 RSI: ffffffffbc4e06a0 RDI: 0000000000000000
[ 1190.754449][    C3] RBP: 0000000000000001 R08: ffffffffbc4e06a4 R09: ffffffffbc4e06a0
[ 1190.754451][    C3] R10: ffffffffb9f6e9d0 R11: 0000000000000000 R12: ffa00000004a6ef0
[ 1190.754453][    C3] R13: ffa00000004a6e98 R14: ff11000008fec640 R15: 0000000000000000
[ 1190.754454][    C3]  ? rtmsg_fib (./include/linux/skbuff.h:1386 ./include/net/netlink.h:1055 net/ipv4/fib_semantics.c:551)
[ 1190.754457][    C3]  ? rtmsg_fib (net/ipv4/fib_semantics.c:545)
[ 1190.754459][    C3]  unwind_next_frame (arch/x86/kernel/unwind_orc.c:217 arch/x86/kernel/unwind_orc.c:510)
[ 1190.754461][    C3]  ? rtmsg_fib (./include/linux/skbuff.h:1386 ./include/net/netlink.h:1055 net/ipv4/fib_semantics.c:551)
[ 1190.754462][    C3]  ? stack_access_ok (./arch/x86/include/asm/stacktrace.h:55)
[ 1190.754464][    C3]  ? __unwind_start (arch/x86/kernel/unwind_orc.c:787)
[ 1190.754466][    C3]  ? write_profile (profile.c:?)
[ 1190.754468][    C3]  arch_stack_walk (arch/x86/kernel/stacktrace.c:25)
[ 1190.754472][    C3]  ? rtmsg_fib (./include/linux/skbuff.h:1386 ./include/net/netlink.h:1055 net/ipv4/fib_semantics.c:551)
[ 1190.754474][    C3]  stack_trace_save (kernel/stacktrace.c:122 (discriminator 1))
[ 1190.754476][    C3]  ? filter_irq_stacks (kernel/stacktrace.c:402)
[ 1190.754478][    C3]  ? __unwind_start (arch/x86/kernel/unwind_orc.c:787)
[ 1190.754479][    C3]  ? cleanup_net (net/core/net_namespace.c:702)
[ 1190.754481][    C3]  ? write_profile (profile.c:?)
[ 1190.754483][    C3]  ? __kernel_text_address (kernel/extable.c:79)
[ 1190.754484][    C3]  ? write_profile (profile.c:?)
[ 1190.754486][    C3]  kasan_save_stack (mm/kasan/common.c:57)
[ 1190.754489][    C3]  ? kasan_save_stack (mm/kasan/common.c:57)
[ 1190.754490][    C3]  ? kasan_save_track (mm/kasan/common.c:78)
[ 1190.754491][    C3]  ? __kasan_slab_alloc (mm/kasan/common.c:340 mm/kasan/common.c:366)
[ 1190.754493][    C3]  ? kmem_cache_alloc_node_noprof (./include/linux/kasan.h:253 mm/slub.c:4570 mm/slub.c:4899 mm/slub.c:4951)
[ 1190.754495][    C3]  ? kmalloc_reserve (net/core/skbuff.c:613 (discriminator 7))
[ 1190.754496][    C3]  ? __alloc_skb (net/core/skbuff.c:713)
[ 1190.754498][    C3]  ? rtmsg_fib (./include/linux/skbuff.h:1386 ./include/net/netlink.h:1055 net/ipv4/fib_semantics.c:551)
[ 1190.754503][    C3]  kasan_save_track (mm/kasan/common.c:78)
[ 1190.754504][    C3]  __kasan_slab_alloc (mm/kasan/common.c:340 mm/kasan/common.c:366)
[ 1190.754506][    C3]  kmem_cache_alloc_node_noprof (./include/linux/kasan.h:253 mm/slub.c:4570 mm/slub.c:4899 mm/slub.c:4951)
[ 1190.754508][    C3]  kmalloc_reserve (net/core/skbuff.c:613 (discriminator 7))
[ 1190.754510][    C3]  __alloc_skb (net/core/skbuff.c:713)
[ 1190.754511][    C3]  ? __alloc_skb (./include/linux/bottom_half.h:20 (discriminator 2) net/core/skbuff.c:695 (discriminator 2))
[ 1190.754513][    C3]  ? napi_skb_cache_get (./include/linux/local_lock_internal.h:61)
[ 1190.754515][    C3]  ? atomic_notifier_call_chain (./include/linux/rcupdate.h:871 kernel/notifier.c:224)
[ 1190.754517][    C3]  rtmsg_fib (./include/linux/skbuff.h:1386 ./include/net/netlink.h:1055 net/ipv4/fib_semantics.c:551)
[ 1190.754519][    C3]  ? fib_dump_info (net/ipv4/fib_semantics.c:1725)
[ 1190.754520][    C3]  ? ret_from_fork_asm (arch/x86/entry/entry_64.S:245)
[ 1190.754523][    C3]  fib_table_delete (net/ipv4/fib_trie.c:1740 (discriminator 1))
[ 1190.754526][    C3]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1190.754527][    C3]  ? fib_table_lookup (net/ipv4/fib_trie.c:1604)
[ 1190.754529][    C3]  ? lockdep_rtnl_is_held (./include/linux/lockdep.h:249 net/core/rtnetlink.c:182)
[ 1190.754531][    C3]  ? fib_get_table (net/ipv4/fib_frontend.c:124 (discriminator 2))
[ 1190.754534][    C3]  fib_magic (net/ipv4/fib_frontend.c:1136)
[ 1190.754536][    C3]  ? fib_new_table (net/ipv4/fib_frontend.c:88 (discriminator 1))
[ 1190.754540][    C3]  fib_del_ifaddr (net/ipv4/fib_frontend.c:1347)
[ 1190.754541][    C3]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[ 1190.754543][    C3]  fib_inetaddr_event (net/ipv4/fib_frontend.c:1478)
[ 1190.754545][    C3]  notifier_call_chain (kernel/notifier.c:85)
[ 1190.754547][    C3]  blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 1190.754549][    C3]  __inet_del_ifa (net/ipv4/devinet.c:450)
[ 1190.754552][    C3]  ? lockdep_rtnl_is_held (./include/linux/lockdep.h:249 net/core/rtnetlink.c:182)
[ 1190.754553][    C3]  inetdev_event (net/ipv4/devinet.c:487 net/ipv4/devinet.c:328 net/ipv4/devinet.c:1655)
[ 1190.754555][    C3]  ? 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)
[ 1190.754559][    C3]  notifier_call_chain (kernel/notifier.c:85)
[ 1190.754562][    C3]  unregister_netdevice_many_notify (net/core/dev.c:2287 net/core/dev.c:2301 net/core/dev.c:12446)
[ 1190.754566][    C3]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[ 1190.754567][    C3]  ? 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)
[ 1190.754569][    C3]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[ 1190.754571][    C3]  ? unregister_netdevice_queue (net/core/dev.c:12311 (discriminator 1))
[ 1190.754575][    C3]  default_device_exit_batch (net/core/dev.c:12507 net/core/dev.c:13099)
[ 1190.754578][    C3]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[ 1190.754581][    C3]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[ 1190.754584][    C3]  ? fou_exit_net (net/ipv4/fou_core.c:1228)
[ 1190.754588][    C3]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[ 1190.754590][    C3]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[ 1190.754591][    C3]  ? netns_install (./include/linux/ns_common.h:26)
[ 1190.754593][    C3]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1190.754594][    C3]  ? idr_destroy (lib/radix-tree.c:310 lib/radix-tree.c:674 lib/radix-tree.c:1563)
[ 1190.754597][    C3]  cleanup_net (net/core/net_namespace.c:702)
[ 1190.754599][    C3]  ? net_passive_dec (./include/linux/llist.h:241)
[ 1190.754600][    C3]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[ 1190.754602][    C3]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[ 1190.754604][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1190.754606][    C3]  process_one_work (kernel/workqueue.c:3314)
[ 1190.754608][    C3]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[ 1190.754610][    C3]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 1190.754613][    C3]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[ 1190.754615][    C3]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[ 1190.754617][    C3]  ? __kthread_parkme (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:272)
[ 1190.754619][    C3]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[ 1190.754621][    C3]  kthread (kernel/kthread.c:436)
[ 1190.754623][    C3]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[ 1190.754626][    C3]  ? kthread_affine_node (kernel/kthread.c:378)
[ 1190.754628][    C3]  ret_from_fork (arch/x86/kernel/process.c:158)
[ 1190.754630][    C3]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[ 1190.754632][    C3]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[ 1190.754634][    C3]  ? kthread_affine_node (kernel/kthread.c:378)


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