======================================
| [   73.009365][ T1043] ==================================================================
| [   73.009936][ T1043] 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)
| [   73.010434][ T1043] Write of size 8 at addr 0000000000000000 by task ip/1043
| [   73.010906][ T1043]
[   73.011112][ T1043] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   73.011121][ T1043] Call Trace:
[   73.011124][ T1043]  <TASK>
[   73.011127][ T1043]  dump_stack_lvl (lib/dump_stack.c:123)
[   73.011139][ T1043]  ? try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   73.011145][ T1043]  kasan_report (mm/kasan/report.c:597)
[   73.011154][ T1043]  ? try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   73.011161][ T1043]  kasan_check_range (mm/kasan/generic.c:194 mm/kasan/generic.c:200)
[   73.011167][ T1043]  try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   73.011177][ T1043]  __cancel_work (kernel/workqueue.c:2161 kernel/workqueue.c:4364)
[   73.011182][ T1043]  ? enable_delayed_work (kernel/workqueue.c:4359)
[   73.011194][ T1043]  __cancel_work_sync (kernel/workqueue.c:4383)
[   73.011201][ T1043]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[   73.011210][ T1043]  ? netdev_notify_peers (net/core/dev.c:1891)
[   73.011217][ T1043]  ? netif_close_many (net/core/dev.c:1959)
[   73.011226][ T1043]  netif_close_many (net/core/dev.c:1959)
[   73.011234][ T1043]  ? __dev_close_many (net/core/dev.c:1949)
[   73.011241][ T1043]  ? netif_close_many_and_unlock (net/core/dev.c:12476)
[   73.011251][ T1043]  unregister_netdevice_many_notify (net/core/dev.c:12545)
[   73.011259][ T1043]  ? vxlan_dellink (drivers/net/vxlan/vxlan_core.c:4480) vxlan
[   73.011299][ T1043]  ? vxlan_fdb_delete_bulk (drivers/net/vxlan/vxlan_core.c:4480) vxlan
[   73.011322][ T1043]  ? dev_ingress_queue_create (net/core/dev.c:12499)
[   73.011329][ T1043]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.011335][ T1043]  ? __nla_validate_parse (./include/net/netlink.h:1307 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[   73.011346][ T1043]  rtnl_dellink (net/core/rtnetlink.c:3530 net/core/rtnetlink.c:3570)
[   73.011354][ T1043]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   73.011390][ T1043]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.011398][ T1043]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.011409][ T1043]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.011415][ T1043]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   73.011419][ T1043]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   73.011426][ T1043]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   73.011432][ T1043]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   73.011439][ T1043]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   73.011444][ T1043]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.011456][ T1043]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   73.011463][ T1043]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   73.011469][ T1043]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   73.011482][ T1043]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   73.011486][ T1043]  ? 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)
[   73.011493][ T1043]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   73.011501][ T1043]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   73.011508][ T1043]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.011518][ T1043]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   73.011527][ T1043]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   73.011533][ T1043]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   73.011541][ T1043]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   73.011548][ T1043]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   73.011556][ T1043]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   73.011561][ T1043]  ? __copy_msghdr (net/socket.c:2556)
[   73.011574][ T1043]  ___sys_sendmsg (net/socket.c:2686)
[   73.011579][ T1043]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   73.011584][ T1043]  ? __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)
[   73.011593][ T1043]  ? copy_msghdr_from_user (net/socket.c:2673)
[   73.011602][ T1043]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.011610][ T1043]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.011619][ T1043]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.011626][ T1043]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   73.011632][ T1043]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   73.011644][ T1043]  __sys_sendmsg (net/socket.c:2716)
[   73.011649][ T1043]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   73.011655][ T1043]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   73.011669][ T1043]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   73.011676][ T1043]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   73.011685][ T1043]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   73.011690][ T1043] RIP: 0033:0x7fc18e5351d7
[   73.011697][ T1043] 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)
[   73.011702][ T1043] RSP: 002b:00007fff9bd09098 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   73.011708][ T1043] RAX: ffffffffffffffda RBX: 00007fff9bd097c0 RCX: 00007fc18e5351d7
[   73.011711][ T1043] RDX: 0000000000000000 RSI: 00007fff9bd09100 RDI: 0000000000000005
[   73.011715][ T1043] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   73.011717][ T1043] R10: 00007fc18e431f60 R11: 0000000000000246 R12: 0000000000000002
[   73.011720][ T1043] R13: 00000000691cbb52 R14: 0000000000499600 R15: 0000000000000000
| [   73.040178][ T1043] #PF: error_code(0x0002) - not-present page
| [   73.040548][ T1043] PGD 236e067 P4D 236e067 PUD 9fe9067 PMD 0
| [   73.041154][ T1043] Oops: Oops: 0002 [#1] SMP KASAN
| [   73.042037][ T1043] Tainted: [B]=BAD_PAGE
[   73.042461][ T1043] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   73.042834][ T1043] 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)
[   73.043232][ T1043] 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
[   73.044531][ T1043] RSP: 0018:ffffc90001486f18 EFLAGS: 00010046
[   73.044903][ T1043] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffa004090a
[   73.045592][ T1043] RDX: fffffbfff484f2cd RSI: 0000000000000008 RDI: ffffffffa4279660
[   73.046076][ T1043] RBP: ffffc90001486f80 R08: 0000000000000001 R09: fffffbfff484f2cc
[   73.046515][ T1043] R10: ffffffffa4279667 R11: ffffc90001486a00 R12: 0000000000000000
[   73.047155][ T1043] R13: 0000000000000286 R14: ffff88800e3f2000 R15: dffffc0000000000
[   73.047593][ T1043] FS:  00007fc18e367800(0000) GS:ffff888091ff2000(0000) knlGS:0000000000000000
[   73.048139][ T1043] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   73.048496][ T1043] CR2: 0000000000000000 CR3: 0000000005a9e002 CR4: 0000000000772ef0
[   73.048910][ T1043] PKRU: 55555554
[   73.049357][ T1043] Call Trace:
[   73.049582][ T1043]  <TASK>
[   73.049733][ T1043]  __cancel_work (kernel/workqueue.c:2161 kernel/workqueue.c:4364)
[   73.050088][ T1043]  ? enable_delayed_work (kernel/workqueue.c:4359)
[   73.050381][ T1043]  __cancel_work_sync (kernel/workqueue.c:4383)
[   73.050869][ T1043]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[   73.051183][ T1043]  ? netdev_notify_peers (net/core/dev.c:1891)
[   73.051467][ T1043]  ? netif_close_many (net/core/dev.c:1959)
[   73.051766][ T1043]  netif_close_many (net/core/dev.c:1959)
[   73.052057][ T1043]  ? __dev_close_many (net/core/dev.c:1949)
[   73.052337][ T1043]  ? netif_close_many_and_unlock (net/core/dev.c:12476)
[   73.052701][ T1043]  unregister_netdevice_many_notify (net/core/dev.c:12545)
[   73.053068][ T1043]  ? vxlan_dellink (drivers/net/vxlan/vxlan_core.c:4480) vxlan
[   73.053589][ T1043]  ? vxlan_fdb_delete_bulk (drivers/net/vxlan/vxlan_core.c:4480) vxlan
[   73.053990][ T1043]  ? dev_ingress_queue_create (net/core/dev.c:12499)
[   73.054288][ T1043]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.054805][ T1043]  ? __nla_validate_parse (./include/net/netlink.h:1307 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[   73.055143][ T1043]  rtnl_dellink (net/core/rtnetlink.c:3530 net/core/rtnetlink.c:3570)
[   73.055450][ T1043]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   73.055821][ T1043]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.056320][ T1043]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.056608][ T1043]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.056895][ T1043]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   73.057192][ T1043]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   73.057675][ T1043]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   73.058047][ T1043]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   73.058356][ T1043]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   73.058679][ T1043]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.059199][ T1043]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   73.059484][ T1043]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   73.059809][ T1043]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   73.060140][ T1043]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   73.060648][ T1043]  ? 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)
[   73.060927][ T1043]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   73.061206][ T1043]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   73.061485][ T1043]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.062001][ T1043]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   73.062289][ T1043]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   73.062576][ T1043]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   73.062891][ T1043]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   73.063381][ T1043]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   73.063673][ T1043]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   73.064015][ T1043]  ? __copy_msghdr (net/socket.c:2556)
[   73.064328][ T1043]  ___sys_sendmsg (net/socket.c:2686)
[   73.064818][ T1043]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   73.065110][ T1043]  ? __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)
[   73.065527][ T1043]  ? copy_msghdr_from_user (net/socket.c:2673)
[   73.066020][ T1043]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.066321][ T1043]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.066601][ T1043]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.066909][ T1043]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   73.067402][ T1043]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   73.067683][ T1043]  __sys_sendmsg (net/socket.c:2716)
[   73.067991][ T1043]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   73.068393][ T1043]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   73.068902][ T1043]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   73.069216][ T1043]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   73.069502][ T1043]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   73.069907][ T1043] RIP: 0033:0x7fc18e5351d7
[   73.070417][ T1043] 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)
[   73.071692][ T1043] RSP: 002b:00007fff9bd09098 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   73.072118][ T1043] RAX: ffffffffffffffda RBX: 00007fff9bd097c0 RCX: 00007fc18e5351d7
[   73.072558][ T1043] RDX: 0000000000000000 RSI: 00007fff9bd09100 RDI: 0000000000000005
[   73.073200][ T1043] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   73.073657][ T1043] R10: 00007fc18e431f60 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