======================================
| [   24.668047][  T347] ==================================================================
| [   24.668378][  T347] 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)
| [   24.668677][  T347] Write of size 8 at addr 0000000000000000 by task ip/347
| [   24.668901][  T347]
[   24.669005][  T347] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   24.669008][  T347] Call Trace:
[   24.669012][  T347]  <TASK>
[   24.669014][  T347]  dump_stack_lvl (lib/dump_stack.c:123)
[   24.669027][  T347]  ? try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   24.669031][  T347]  kasan_report (mm/kasan/report.c:597)
[   24.669039][  T347]  ? try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   24.669045][  T347]  kasan_check_range (mm/kasan/generic.c:194 mm/kasan/generic.c:200)
[   24.669049][  T347]  try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   24.669054][  T347]  __cancel_work (kernel/workqueue.c:2161 kernel/workqueue.c:4364)
[   24.669058][  T347]  ? enable_delayed_work (kernel/workqueue.c:4359)
[   24.669063][  T347]  ? qdisc_destroy (net/sched/sch_generic.c:1355)
[   24.669071][  T347]  __cancel_work_sync (kernel/workqueue.c:4383)
[   24.669075][  T347]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[   24.669082][  T347]  ? netdev_notify_peers (net/core/dev.c:1891)
[   24.669085][  T347]  ? netif_close_many (net/core/dev.c:1959)
[   24.669090][  T347]  netif_close_many (net/core/dev.c:1959)
[   24.669094][  T347]  ? __mutex_handoff (kernel/locking/mutex.c:88)
[   24.669100][  T347]  ? __dev_close_many (net/core/dev.c:1949)
[   24.669104][  T347]  ? netif_close_many_and_unlock (net/core/dev.c:12476)
[   24.669108][  T347]  unregister_netdevice_many_notify (net/core/dev.c:12545)
[   24.669115][  T347]  ? dev_ingress_queue_create (net/core/dev.c:12499)
[   24.669118][  T347]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   24.669122][  T347]  ? unregister_netdevice_queue (net/core/dev.c:12442)
[   24.669125][  T347]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.669129][  T347]  ? unregister_netdevice_many (net/core/dev.c:12441)
[   24.669133][  T347]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48) ip6_gre
[   24.669143][  T347]  ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[   24.669149][  T347]  rtnl_dellink (net/core/rtnetlink.c:3530 net/core/rtnetlink.c:3570)
[   24.669154][  T347]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   24.669173][  T347]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.669179][  T347]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.669184][  T347]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.669188][  T347]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   24.669191][  T347]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.669195][  T347]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   24.669198][  T347]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   24.669203][  T347]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   24.669206][  T347]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.669212][  T347]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   24.669216][  T347]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   24.669220][  T347]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   24.669227][  T347]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   24.669229][  T347]  ? 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)
[   24.669233][  T347]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   24.669237][  T347]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   24.669241][  T347]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.669245][  T347]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   24.669250][  T347]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   24.669253][  T347]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   24.669260][  T347]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   24.669263][  T347]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   24.669267][  T347]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   24.669269][  T347]  ? __copy_msghdr (net/socket.c:2556)
[   24.669278][  T347]  ___sys_sendmsg (net/socket.c:2686)
[   24.669280][  T347]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   24.669284][  T347]  ? __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)
[   24.669291][  T347]  ? copy_msghdr_from_user (net/socket.c:2673)
[   24.669295][  T347]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.669300][  T347]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.669305][  T347]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.669310][  T347]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   24.669322][  T347]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.669331][  T347]  __sys_sendmsg (net/socket.c:2716)
[   24.669333][  T347]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   24.669336][  T347]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   24.669348][  T347]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   24.669355][  T347]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   24.669362][  T347]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   24.669369][  T347] RIP: 0033:0x7f2ebf60a1d7
[   24.669375][  T347] 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)
[   24.669379][  T347] RSP: 002b:00007ffed277db18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   24.669385][  T347] RAX: ffffffffffffffda RBX: 00007ffed277e240 RCX: 00007f2ebf60a1d7
[   24.669387][  T347] RDX: 0000000000000000 RSI: 00007ffed277db80 RDI: 0000000000000005
[   24.669389][  T347] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   24.669391][  T347] R10: 00007f2ebf506f60 R11: 0000000000000246 R12: 0000000000000002
[   24.669392][  T347] R13: 00000000691cd68e R14: 0000000000499600 R15: 0000000000000000
| [   24.685439][  T347] #PF: error_code(0x0002) - not-present page
| [   24.685651][  T347] PGD b2cd067 P4D b2cd067 PUD e728067 PMD 0
| [   24.685896][  T347] Oops: Oops: 0002 [#1] SMP KASAN
| [   24.686419][  T347] Tainted: [B]=BAD_PAGE
[   24.686552][  T347] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   24.686780][  T347] 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)
[   24.687028][  T347] 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 1f 93 82 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 1f 93 82 00       	call   0x829349
  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
[   24.687634][  T347] RSP: 0018:ffffc90000c56f08 EFLAGS: 00010046
[   24.687900][  T347] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff86849b8a
[   24.688152][  T347] RDX: fffffbfff16acacd RSI: 0000000000000008 RDI: ffffffff8b565660
[   24.688421][  T347] RBP: ffffc90000c56f70 R08: 0000000000000001 R09: fffffbfff16acacc
[   24.688681][  T347] R10: ffffffff8b565667 R11: ffffc90000c569c0 R12: 0000000000000000
[   24.688974][  T347] R13: 0000000000000282 R14: ffff88800cac1000 R15: dffffc0000000000
[   24.689251][  T347] FS:  00007f2ebf43c800(0000) GS:ffff8880e1b87000(0000) knlGS:0000000000000000
[   24.689545][  T347] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   24.689765][  T347] CR2: 0000000000000000 CR3: 0000000002df5006 CR4: 0000000000772ef0
[   24.690056][  T347] PKRU: 55555554
[   24.690189][  T347] Call Trace:
[   24.690334][  T347]  <TASK>
[   24.690426][  T347]  __cancel_work (kernel/workqueue.c:2161 kernel/workqueue.c:4364)
[   24.690623][  T347]  ? enable_delayed_work (kernel/workqueue.c:4359)
[   24.690828][  T347]  ? qdisc_destroy (net/sched/sch_generic.c:1355)
[   24.691017][  T347]  __cancel_work_sync (kernel/workqueue.c:4383)
[   24.691190][  T347]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[   24.691362][  T347]  ? netdev_notify_peers (net/core/dev.c:1891)
[   24.691532][  T347]  ? netif_close_many (net/core/dev.c:1959)
[   24.691711][  T347]  netif_close_many (net/core/dev.c:1959)
[   24.691904][  T347]  ? __mutex_handoff (kernel/locking/mutex.c:88)
[   24.692091][  T347]  ? __dev_close_many (net/core/dev.c:1949)
[   24.692259][  T347]  ? netif_close_many_and_unlock (net/core/dev.c:12476)
[   24.692472][  T347]  unregister_netdevice_many_notify (net/core/dev.c:12545)
[   24.692695][  T347]  ? dev_ingress_queue_create (net/core/dev.c:12499)
[   24.692883][  T347]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   24.693077][  T347]  ? unregister_netdevice_queue (net/core/dev.c:12442)
[   24.693284][  T347]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.693453][  T347]  ? unregister_netdevice_many (net/core/dev.c:12441)
[   24.693625][  T347]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48) ip6_gre
[   24.693798][  T347]  ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[   24.693969][  T347]  rtnl_dellink (net/core/rtnetlink.c:3530 net/core/rtnetlink.c:3570)
[   24.694153][  T347]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   24.694383][  T347]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.694573][  T347]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.694746][  T347]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.694913][  T347]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   24.695093][  T347]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.695261][  T347]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   24.695471][  T347]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   24.695652][  T347]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   24.695820][  T347]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.695990][  T347]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   24.696174][  T347]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   24.696341][  T347]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   24.696515][  T347]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   24.696688][  T347]  ? 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)
[   24.696860][  T347]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   24.697029][  T347]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   24.697210][  T347]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.697379][  T347]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   24.697548][  T347]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   24.697720][  T347]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   24.697894][  T347]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   24.698061][  T347]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   24.698250][  T347]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   24.698456][  T347]  ? __copy_msghdr (net/socket.c:2556)
[   24.698637][  T347]  ___sys_sendmsg (net/socket.c:2686)
[   24.698804][  T347]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   24.698976][  T347]  ? __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)
[   24.699201][  T347]  ? copy_msghdr_from_user (net/socket.c:2673)
[   24.699372][  T347]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.699547][  T347]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.699833][  T347]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.700002][  T347]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   24.700181][  T347]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.700366][  T347]  __sys_sendmsg (net/socket.c:2716)
[   24.700653][  T347]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   24.700861][  T347]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   24.701031][  T347]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   24.701218][  T347]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   24.701498][  T347]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   24.701715][  T347] RIP: 0033:0x7f2ebf60a1d7
[   24.701904][  T347] 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)
[   24.702635][  T347] RSP: 002b:00007ffed277db18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   24.702907][  T347] RAX: ffffffffffffffda RBX: 00007ffed277e240 RCX: 00007f2ebf60a1d7
[   24.703170][  T347] RDX: 0000000000000000 RSI: 00007ffed277db80 RDI: 0000000000000005
[   24.703436][  T347] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   24.703801][  T347] R10: 00007f2ebf506f60 R11: 0000000000000246 R12: 0000000000000002


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