======================================
| [   90.266662][ T2366] ==================================================================
| [   90.267027][ T2366] BUG: KASAN: null-ptr-deref in try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
| [   90.267357][ T2366] Write of size 8 at addr 0000000000000000 by task ip/2366
| [   90.267665][ T2366]
[   90.267782][ T2366] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   90.267786][ T2366] Call Trace:
[   90.267789][ T2366]  <TASK>
[   90.267792][ T2366]  dump_stack_lvl (lib/dump_stack.c:123)
[   90.267807][ T2366]  ? try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   90.267811][ T2366]  kasan_report (mm/kasan/report.c:597)
[   90.267823][ T2366]  ? try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   90.267828][ T2366]  kasan_check_range (mm/kasan/generic.c:194 mm/kasan/generic.c:200)
[   90.267832][ T2366]  try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   90.267838][ T2366]  __cancel_work (kernel/workqueue.c:2161 kernel/workqueue.c:4364)
[   90.267841][ T2366]  ? enable_delayed_work (kernel/workqueue.c:4359)
[   90.267848][ T2366]  __cancel_work_sync (kernel/workqueue.c:4383)
[   90.267852][ T2366]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[   90.267862][ T2366]  ? netdev_notify_peers (net/core/dev.c:1891)
[   90.267866][ T2366]  ? netif_close_many (net/core/dev.c:1959)
[   90.267871][ T2366]  netif_close_many (net/core/dev.c:1959)
[   90.267876][ T2366]  ? __dev_close_many (net/core/dev.c:1949)
[   90.267880][ T2366]  ? netif_close_many_and_unlock (net/core/dev.c:12476)
[   90.267884][ T2366]  ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21))
[   90.267892][ T2366]  unregister_netdevice_many_notify (net/core/dev.c:12545)
[   90.267897][ T2366]  ? vxlan_dellink (drivers/net/vxlan/vxlan_core.c:4488) vxlan
[   90.267912][ T2366]  ? vxlan_fdb_delete_bulk (drivers/net/vxlan/vxlan_core.c:4480) vxlan
[   90.267922][ T2366]  ? dev_ingress_queue_create (net/core/dev.c:12499)
[   90.267927][ T2366]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   90.267930][ T2366]  ? __nla_validate_parse (./include/net/netlink.h:1307 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[   90.267947][ T2366]  rtnl_dellink (net/core/rtnetlink.c:3530 net/core/rtnetlink.c:3570)
[   90.267952][ T2366]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   90.267971][ T2366]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   90.267977][ T2366]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   90.267987][ T2366]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   90.267992][ T2366]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   90.267995][ T2366]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   90.268002][ T2366]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   90.268006][ T2366]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   90.268009][ T2366]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   90.268012][ T2366]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   90.268020][ T2366]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   90.268028][ T2366]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   90.268031][ T2366]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   90.268038][ T2366]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   90.268041][ T2366]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333)
[   90.268045][ T2366]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   90.268050][ T2366]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   90.268054][ T2366]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   90.268059][ T2366]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   90.268064][ T2366]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   90.268068][ T2366]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   90.268075][ T2366]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   90.268078][ T2366]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   90.268085][ T2366]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   90.268088][ T2366]  ? __copy_msghdr (net/socket.c:2556)
[   90.268096][ T2366]  ___sys_sendmsg (net/socket.c:2686)
[   90.268099][ T2366]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   90.268101][ T2366]  ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3125)
[   90.268114][ T2366]  ? copy_msghdr_from_user (net/socket.c:2673)
[   90.268119][ T2366]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   90.268124][ T2366]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   90.268129][ T2366]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   90.268133][ T2366]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   90.268147][ T2366]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   90.268153][ T2366]  __sys_sendmsg (net/socket.c:2716)
[   90.268156][ T2366]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   90.268160][ T2366]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   90.268168][ T2366]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   90.268172][ T2366]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   90.268179][ T2366]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   90.268189][ T2366] RIP: 0033:0x7f2ddcd7d1d7
[   90.268197][ T2366] Code: 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0e                   	(bad)
   1:	00 f7                	add    %dh,%bh
   3:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[   90.268200][ T2366] RSP: 002b:00007fff68f835f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   90.268205][ T2366] RAX: ffffffffffffffda RBX: 00007fff68f83d20 RCX: 00007f2ddcd7d1d7
[   90.268207][ T2366] RDX: 0000000000000000 RSI: 00007fff68f83660 RDI: 0000000000000005
[   90.268209][ T2366] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   90.268211][ T2366] R10: 00007f2ddcc79f60 R11: 0000000000000246 R12: 0000000000000002
[   90.268213][ T2366] R13: 00000000691cbb6a R14: 0000000000499600 R15: 0000000000000000
| [   90.284339][ T2366] #PF: error_code(0x0002) - not-present page
| [   90.284557][ T2366] PGD 93db067 P4D 93db067 PUD c32d067 PMD 0
| [   90.284789][ T2366] Oops: Oops: 0002 [#1] SMP KASAN
| [   90.285364][ T2366] Tainted: [B]=BAD_PAGE
[   90.285503][ T2366] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   90.285734][ T2366] RIP: 0010:try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   90.285967][ T2366] Code: 00 41 89 c0 b8 01 00 00 00 45 85 c0 74 0f 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3 be 08 00 00 00 48 89 df e8 7f 7f 81 00 <f0> 48 0f ba 2b 00 72 11 48 83 c4 10 31 c0 5b 5d 41 5c 41 5d 41 5e
All code
========
   0:	00 41 89             	add    %al,-0x77(%rcx)
   3:	c0 b8 01 00 00 00 45 	sarb   $0x45,0x1(%rax)
   a:	85 c0                	test   %eax,%eax
   c:	74 0f                	je     0x1d
   e:	48 83 c4 10          	add    $0x10,%rsp
  12:	5b                   	pop    %rbx
  13:	5d                   	pop    %rbp
  14:	41 5c                	pop    %r12
  16:	41 5d                	pop    %r13
  18:	41 5e                	pop    %r14
  1a:	41 5f                	pop    %r15
  1c:	c3                   	ret
  1d:	be 08 00 00 00       	mov    $0x8,%esi
  22:	48 89 df             	mov    %rbx,%rdi
  25:	e8 7f 7f 81 00       	call   0x817fa9
  2a:*	f0 48 0f ba 2b 00    	lock btsq $0x0,(%rbx)		<-- trapping instruction
  30:	72 11                	jb     0x43
  32:	48 83 c4 10          	add    $0x10,%rsp
  36:	31 c0                	xor    %eax,%eax
  38:	5b                   	pop    %rbx
  39:	5d                   	pop    %rbp
  3a:	41 5c                	pop    %r12
  3c:	41 5d                	pop    %r13
  3e:	41 5e                	pop    %r14

Code starting with the faulting instruction
===========================================
   0:	f0 48 0f ba 2b 00    	lock btsq $0x0,(%rbx)
   6:	72 11                	jb     0x19
   8:	48 83 c4 10          	add    $0x10,%rsp
   c:	31 c0                	xor    %eax,%eax
   e:	5b                   	pop    %rbx
   f:	5d                   	pop    %rbp
  10:	41 5c                	pop    %r12
  12:	41 5d                	pop    %r13
  14:	41 5e                	pop    %r14
[   90.286617][ T2366] RSP: 0018:ffffc90004bbef18 EFLAGS: 00010046
[   90.286850][ T2366] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffa1e4090a
[   90.287115][ T2366] RDX: fffffbfff4c0f2cd RSI: 0000000000000008 RDI: ffffffffa6079660
[   90.287391][ T2366] RBP: ffffc90004bbef80 R08: 0000000000000001 R09: fffffbfff4c0f2cc
[   90.287696][ T2366] R10: ffffffffa6079667 R11: ffffc90004bbea00 R12: 0000000000000000
[   90.287956][ T2366] R13: 0000000000000286 R14: ffff88800c142000 R15: dffffc0000000000
[   90.288234][ T2366] FS:  00007f2ddcbaf800(0000) GS:ffff8880901f2000(0000) knlGS:0000000000000000
[   90.288562][ T2366] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   90.288804][ T2366] CR2: 0000000000000000 CR3: 000000000fe97006 CR4: 0000000000772ef0
[   90.289074][ T2366] PKRU: 55555554
[   90.289235][ T2366] Call Trace:
[   90.289376][ T2366]  <TASK>
[   90.289476][ T2366]  __cancel_work (kernel/workqueue.c:2161 kernel/workqueue.c:4364)
[   90.289672][ T2366]  ? enable_delayed_work (kernel/workqueue.c:4359)
[   90.289851][ T2366]  __cancel_work_sync (kernel/workqueue.c:4383)
[   90.290030][ T2366]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[   90.290204][ T2366]  ? netdev_notify_peers (net/core/dev.c:1891)
[   90.290388][ T2366]  ? netif_close_many (net/core/dev.c:1959)
[   90.290557][ T2366]  netif_close_many (net/core/dev.c:1959)
[   90.290746][ T2366]  ? __dev_close_many (net/core/dev.c:1949)
[   90.290928][ T2366]  ? netif_close_many_and_unlock (net/core/dev.c:12476)
[   90.291148][ T2366]  ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21))
[   90.291339][ T2366]  unregister_netdevice_many_notify (net/core/dev.c:12545)
[   90.291568][ T2366]  ? vxlan_dellink (drivers/net/vxlan/vxlan_core.c:4488) vxlan
[   90.291760][ T2366]  ? vxlan_fdb_delete_bulk (drivers/net/vxlan/vxlan_core.c:4480) vxlan
[   90.291982][ T2366]  ? dev_ingress_queue_create (net/core/dev.c:12499)
[   90.292154][ T2366]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   90.292334][ T2366]  ? __nla_validate_parse (./include/net/netlink.h:1307 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[   90.292532][ T2366]  rtnl_dellink (net/core/rtnetlink.c:3530 net/core/rtnetlink.c:3570)
[   90.292727][ T2366]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   90.292963][ T2366]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   90.293136][ T2366]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   90.293327][ T2366]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   90.293505][ T2366]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   90.293683][ T2366]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   90.293854][ T2366]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   90.294076][ T2366]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   90.294258][ T2366]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   90.294426][ T2366]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   90.294608][ T2366]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   90.294791][ T2366]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   90.294964][ T2366]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   90.295141][ T2366]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   90.295329][ T2366]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333)
[   90.295507][ T2366]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   90.295695][ T2366]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   90.295875][ T2366]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   90.296051][ T2366]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   90.296234][ T2366]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   90.296414][ T2366]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   90.296588][ T2366]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   90.296774][ T2366]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   90.296958][ T2366]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   90.297173][ T2366]  ? __copy_msghdr (net/socket.c:2556)
[   90.297358][ T2366]  ___sys_sendmsg (net/socket.c:2686)
[   90.297537][ T2366]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   90.297730][ T2366]  ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3125)
[   90.297946][ T2366]  ? copy_msghdr_from_user (net/socket.c:2673)
[   90.298122][ T2366]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   90.298314][ T2366]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   90.298494][ T2366]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   90.298679][ T2366]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   90.298860][ T2366]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   90.299032][ T2366]  __sys_sendmsg (net/socket.c:2716)
[   90.299205][ T2366]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   90.299437][ T2366]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   90.299671][ T2366]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   90.299871][ T2366]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   90.300050][ T2366]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   90.300274][ T2366] RIP: 0033:0x7f2ddcd7d1d7
[   90.300472][ T2366] Code: 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0e                   	(bad)
   1:	00 f7                	add    %dh,%bh
   3:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[   90.301137][ T2366] RSP: 002b:00007fff68f835f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   90.301420][ T2366] RAX: ffffffffffffffda RBX: 00007fff68f83d20 RCX: 00007f2ddcd7d1d7
[   90.301696][ T2366] RDX: 0000000000000000 RSI: 00007fff68f83660 RDI: 0000000000000005
[   90.301961][ T2366] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   90.302238][ T2366] R10: 00007f2ddcc79f60 R11: 0000000000000246 R12: 0000000000000002


Finger prints:
try_to_grab_pending:__cancel_work:__cancel_work_sync:__dev_close_many:netif_close_many
kasan_report:kasan_check_range:try_to_grab_pending:__cancel_work:__cancel_work_sync