======================================
| [  618.989413][    C1]  #4: ffffffffba57dd40 (rcu_read_lock){....}-{1:3}, at: ip6_input (./include/linux/rcupdate.h:300 (discriminator 2) ./include/linux/rcupdate.h:840 (discriminator 2) net/ipv6/ip6_input.c:544 (discriminator 2))
| [  618.989719][    C1]  #5: ff1100000d172f68 (&vxlan->hash_lock){+.-.}-{3:3}, at: vxlan_snoop (./include/linux/spinlock.h:342 drivers/net/vxlan/vxlan_core.c:1487) vxlan
| [  618.990071][    C1]
| [  618.990071][    C1] stack backtrace:
[  618.990291][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  618.990293][    C1] Call Trace:
[  618.990295][    C1]  <IRQ>
[  618.990296][    C1]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[  618.990302][    C1]  lockdep_rcu_suspicious.cold (kernel/locking/lockdep.c:6876)
[  618.990307][    C1] vxlan_fdb_create (drivers/net/vxlan/vxlan_core.c:872 (discriminator 8)) vxlan
[  618.990313][    C1]  ? vxlan_find_mac_rcu (./include/linux/rhashtable.h:648 (discriminator 8) ./include/linux/rhashtable.h:673 (discriminator 8) drivers/net/vxlan/vxlan_core.c:396 (discriminator 8)) vxlan
[  618.990319][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  618.990322][    C1]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  618.990325][    C1]  ? vxlan_open (drivers/net/vxlan/vxlan_core.c:3030) vxlan
[  618.990330][    C1]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  618.990335][    C1] vxlan_fdb_update (drivers/net/vxlan/vxlan_core.c:1095 drivers/net/vxlan/vxlan_core.c:1138) vxlan
[  618.990341][    C1]  ? vxlan_fdb_create (./arch/x86/include/asm/bitops.h:202 (discriminator 1)) vxlan
[  618.990345][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  618.990347][    C1]  ? do_raw_spin_lock (./include/linux/instrumented.h:55 ./include/linux/atomic/atomic-instrumented.h:1301 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116)
[  618.990351][    C1] vxlan_snoop (drivers/net/vxlan/vxlan_core.c:1491) vxlan
[  618.990359][    C1] vxlan_rcv (drivers/net/vxlan/vxlan_core.c:1634 (discriminator 1) drivers/net/vxlan/vxlan_core.c:1772 (discriminator 1)) vxlan
[  618.990368][    C1]  ? encap_bypass_if_local (drivers/net/vxlan/vxlan_core.c:2353) vxlan
[  618.990372][    C1]  ? __udp6_lib_lookup (net/ipv6/udp.c:392)
[  618.990378][    C1]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  618.990382][    C1]  ? encap_bypass_if_local (drivers/net/vxlan/vxlan_core.c:2353) vxlan
[  618.990386][    C1]  ? udpv6_queue_rcv_one_skb (net/ipv6/udp.c:842)
[  618.990389][    C1]  udpv6_queue_rcv_one_skb (net/ipv6/udp.c:842)
[  618.990393][    C1]  udp6_unicast_rcv_skb (net/ipv6/udp.c:1029)
[  618.990396][    C1]  ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:479)
[  618.990403][    C1]  ip6_input_finish (net/ipv6/ip6_input.c:534)
[  618.990406][    C1]  ip6_input (./include/linux/netfilter.h:325 ./include/linux/netfilter.h:319 net/ipv6/ip6_input.c:545)
[  618.990408][    C1]  ? ip6_input_finish (net/ipv6/ip6_input.c:527 (discriminator 46))
[  618.990411][    C1]  ? ip6_rcv_core (./include/linux/rcupdate.h:873 net/ipv6/ip6_input.c:328)
[  618.990416][    C1]  ipv6_rcv (./include/net/dst.h:480 (discriminator 4) net/ipv6/ip6_input.c:119 (discriminator 4) ./include/linux/netfilter.h:325 (discriminator 4) ./include/linux/netfilter.h:319 (discriminator 4) net/ipv6/ip6_input.c:351 (discriminator 4))
[  618.990418][    C1]  ? ip6_rcv_core (net/ipv6/ip6_input.c:211 (discriminator 96))
[  618.990422][    C1]  ? mark_usage (kernel/locking/lockdep.c:4674)
[  618.990424][    C1]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  618.990428][    C1]  ? process_backlog (./include/linux/local_lock_internal.h:62 (discriminator 2) net/core/dev.c:6673 (discriminator 2))
[  618.990430][    C1]  __netif_receive_skb_one_core (net/core/dev.c:6234)
[  618.990432][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  618.990435][    C1]  ? __netif_receive_skb_list_core (net/core/dev.c:6280 (discriminator 2))
[  618.990437][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  618.990443][    C1]  process_backlog (net/core/dev.c:6675)
[  618.990448][    C1]  __napi_poll (net/core/dev.c:7734)
[  618.990451][    C1]  net_rx_action (net/core/dev.c:7797 net/core/dev.c:7954)
[  618.990455][    C1]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  618.990458][    C1]  ? __napi_poll (./include/net/gro.h:507)
[  618.990461][    C1]  ? trace_rcu_this_gp.isra.0 (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3) ./include/trace/events/rcu.h:107 (discriminator 3) kernel/rcu/tree.c:992 (discriminator 3))
[  618.990465][    C1]  ? trace_rcu_quiescent_state_report (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3) ./include/trace/events/rcu.h:368 (discriminator 3))
[  618.990471][    C1]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[  618.990473][    C1]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  618.990476][    C1]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:178 (discriminator 6) kernel/locking/spinlock.c:198 (discriminator 6))
[  618.990478][    C1]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[  618.990482][    C1]  handle_softirqs (kernel/softirq.c:622)
[  618.990487][    C1]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[  618.990491][    C1]  __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)
[  618.990493][    C1]  irq_exit_rcu (kernel/softirq.c:752)
[  618.990495][    C1]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1062 (discriminator 37) arch/x86/kernel/apic/apic.c:1062 (discriminator 37))
[  618.990497][    C1]  </IRQ>
[  618.990498][    C1]  <TASK>
[  618.990499][    C1]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:674)
[  618.990502][    C1] RIP: 0010:lock_release (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 ./arch/x86/include/asm/irqflags.h:159 kernel/locking/lockdep.c:5892 kernel/locking/lockdep.c:5875)
[  618.990504][    C1] Code: 4b 37 04 83 f8 01 0f 85 fc 00 00 00 9c 58 f6 c4 02 0f 85 11 01 00 00 41 f7 c7 00 02 00 00 0f 84 c7 00 00 00 fb 4c 8b 7c 24 18 <48> 8b 5c 24 08 4c 8b 74 24 10 48 83 c4 20 c3 65 8b 05 82 06 37 04
All code
========
   0:	4b 37                	rex.WXB (bad)
   2:	04 83                	add    $0x83,%al
   4:	f8                   	clc
   5:	01 0f                	add    %ecx,(%rdi)
   7:	85 fc                	test   %edi,%esp
   9:	00 00                	add    %al,(%rax)
   b:	00 9c 58 f6 c4 02 0f 	add    %bl,0xf02c4f6(%rax,%rbx,2)
  12:	85 11                	test   %edx,(%rcx)
  14:	01 00                	add    %eax,(%rax)
  16:	00 41 f7             	add    %al,-0x9(%rcx)
  19:	c7 00 02 00 00 0f    	movl   $0xf000002,(%rax)
  1f:	84 c7                	test   %al,%bh
  21:	00 00                	add    %al,(%rax)
  23:	00 fb                	add    %bh,%bl
  25:	4c 8b 7c 24 18       	mov    0x18(%rsp),%r15
  2a:*	48 8b 5c 24 08       	mov    0x8(%rsp),%rbx		<-- trapping instruction
  2f:	4c 8b 74 24 10       	mov    0x10(%rsp),%r14
  34:	48 83 c4 20          	add    $0x20,%rsp
  38:	c3                   	ret
  39:	65 8b 05 82 06 37 04 	mov    %gs:0x4370682(%rip),%eax        # 0x43706c2

Code starting with the faulting instruction
===========================================
   0:	48 8b 5c 24 08       	mov    0x8(%rsp),%rbx
   5:	4c 8b 74 24 10       	mov    0x10(%rsp),%r14
   a:	48 83 c4 20          	add    $0x20,%rsp
   e:	c3                   	ret
   f:	65 8b 05 82 06 37 04 	mov    %gs:0x4370682(%rip),%eax        # 0x4370698
[  618.990506][    C1] RSP: 0018:ffa000000fd07380 EFLAGS: 00000206
[  618.990508][    C1] RAX: 0000000000000046 RBX: ffffffffba775620 RCX: 0000000000000001
[  618.990509][    C1] RDX: 0000000000000003 RSI: ffffffffba001084 RDI: ffffffffb9a7a960
[  618.990510][    C1] RBP: 0000000000092cc0 R08: 0000000000000001 R09: ff1100000a9ed260
[  618.990511][    C1] R10: 0000000000000001 R11: 0000000000000001 R12: ff11000012e694d8
[  618.990512][    C1] R13: 0000000000092cc0 R14: ffffffffb7af5256 R15: 0000000000000001
[  618.990513][    C1]  ? kmem_cache_alloc_noprof (./include/linux/sched/mm.h:318 mm/slub.c:4565 mm/slub.c:4925 mm/slub.c:4959)
[  618.990521][    C1]  kmem_cache_alloc_noprof (./include/linux/sched/mm.h:318 mm/slub.c:4565 mm/slub.c:4925 mm/slub.c:4959)
[  618.990523][    C1]  ? __alloc_object (mm/kmemleak.c:494 (discriminator 1) mm/kmemleak.c:676 (discriminator 1))
[  618.990528][    C1]  __alloc_object (mm/kmemleak.c:494 (discriminator 1) mm/kmemleak.c:676 (discriminator 1))
[  618.990531][    C1]  __create_object (mm/kmemleak.c:790)
[  618.990532][    C1]  ? kasan_save_track (mm/kasan/common.c:78)
[  618.990537][    C1]  kmem_cache_alloc_noprof (./include/linux/kmemleak.h:44 mm/slub.c:4625 mm/slub.c:4945 mm/slub.c:4959)
[  618.990539][    C1]  ? ptlock_alloc (mm/memory.c:7531 (discriminator 7))
[  618.990544][    C1]  ptlock_alloc (mm/memory.c:7531 (discriminator 7))
[  618.990546][    C1]  pte_alloc_one (./include/linux/mm.h:3775 ./include/linux/mm.h:3824 ./include/asm-generic/pgalloc.h:79 arch/x86/mm/pgtable.c:18)
[  618.990549][    C1]  __pte_alloc (mm/memory.c:453)
[  618.990553][    C1]  ? pmd_install (mm/memory.c:445)
[  618.990555][    C1]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4069 (discriminator 3) kernel/rcu/tree.c:4061 (discriminator 3))
[  618.990557][    C1]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[  618.990561][    C1]  copy_pte_range (mm/memory.c:1253 (discriminator 3))
[  618.990567][    C1]  ? copy_present_ptes (./include/linux/page-flags.h:226 (discriminator 3))
[  618.990569][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  618.990571][    C1]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  618.990574][    C1]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[  618.990578][    C1]  ? _raw_spin_unlock (./include/linux/spinlock_api_smp.h:169 (discriminator 1) kernel/locking/spinlock.c:190 (discriminator 1))
[  618.990581][    C1]  copy_p4d_range (mm/memory.c:1408 mm/memory.c:1445 mm/memory.c:1469)
[  618.990588][    C1]  copy_page_range (mm/memory.c:1555)
[  618.990592][    C1]  ? mas_wr_store_entry (lib/maple_tree.c:366)
[  618.990595][    C1]  ? copy_p4d_range (mm/memory.c:1420)
[  618.990599][    C1]  ? __vma_start_exclude_readers (mm/mmap_lock.c:126 (discriminator 38))
[  618.990604][    C1]  dup_mmap (mm/mmap.c:1840)
[  618.990611][    C1]  ? mmap_read_lock_maybe_expand (./include/linux/rwsem.h:221 (discriminator 1))
[  618.990613][    C1]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  618.990615][    C1]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[  618.990618][    C1]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[  618.990620][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  618.990622][    C1]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  618.990628][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  618.990630][    C1]  ? copy_process (kernel/fork.c:1542 kernel/fork.c:1595 kernel/fork.c:2289)
[  618.990633][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  618.990638][    C1]  copy_process (kernel/fork.c:1543 kernel/fork.c:1595 kernel/fork.c:2289)
[  618.990646][    C1]  ? pidfd_prepare (./include/linux/list.h:1021 (discriminator 3) ./include/linux/pid.h:98 (discriminator 3) kernel/fork.c:1918 (discriminator 3))
[  618.990650][    C1]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4069 (discriminator 3) kernel/rcu/tree.c:4061 (discriminator 3))
[  618.990651][    C1]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4069 (discriminator 3) kernel/rcu/tree.c:4061 (discriminator 3))
[  618.990653][    C1]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[  618.990657][    C1]  kernel_clone (kernel/fork.c:2748)
[  618.990660][    C1]  ? create_io_thread (kernel/fork.c:2686)
[  618.990665][    C1]  ? __might_fault (mm/memory.c:7292 (discriminator 5))
[  618.990667][    C1]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  618.990671][    C1]  __do_sys_clone (kernel/fork.c:2889)
[  618.990674][    C1]  ? kernel_clone (./include/trace/events/sched.h:396 (discriminator 19))
[  618.990682][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  618.990684][    C1]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  618.990688][    C1]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  618.990690][    C1]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[  618.990692][    C1]  ? exc_page_fault (arch/x86/mm/fault.c:1489 (discriminator 3) arch/x86/mm/fault.c:1536 (discriminator 3))
[  618.990694][    C1]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  618.990696][    C1] RIP: 0033:0x7ffb162eb126
[  618.990698][    C1] Code: 7d e0 e8 7d af 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 af f5 ff       	call   0xfffffffffff5af84
   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)
	...
[  618.990700][    C1] RSP: 002b:00007fff522fce40 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
[  618.990701][    C1] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007ffb162eb126
[  618.990702][    C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
[  618.990703][    C1] RBP: 00007fff522fce60 R08: 0000000000000000 R09: 0000000000000020
[  618.990703][    C1] R10: 00007ffb16229e50 R11: 0000000000000246 R12: 000055aa68705a90


Finger prints:
vxlan_fdb_create:vxlan_fdb_update:vxlan_snoop:vxlan_rcv:udpv6_queue_rcv_one_skb