======================================
| [   66.798354][ T1042] ==================================================================
| [   66.798717][ T1042] 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)
| [   66.799042][ T1042] Write of size 8 at addr 0000000000000000 by task ip/1042
| [   66.799375][ T1042]
[   66.799503][ T1042] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   66.799508][ T1042] Call Trace:
[   66.799512][ T1042]  <TASK>
[   66.799516][ T1042]  dump_stack_lvl (lib/dump_stack.c:123)
[   66.799531][ T1042]  ? try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   66.799535][ T1042]  kasan_report (mm/kasan/report.c:597)
[   66.799545][ T1042]  ? try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   66.799550][ T1042]  kasan_check_range (mm/kasan/generic.c:194 mm/kasan/generic.c:200)
[   66.799553][ T1042]  try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   66.799559][ T1042]  __cancel_work (kernel/workqueue.c:2161 kernel/workqueue.c:4364)
[   66.799563][ T1042]  ? enable_delayed_work (kernel/workqueue.c:4359)
[   66.799569][ T1042]  __cancel_work_sync (kernel/workqueue.c:4383)
[   66.799574][ T1042]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[   66.799584][ T1042]  ? netdev_notify_peers (net/core/dev.c:1891)
[   66.799588][ T1042]  ? netif_close_many (net/core/dev.c:1959)
[   66.799593][ T1042]  netif_close_many (net/core/dev.c:1959)
[   66.799598][ T1042]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194)
[   66.799611][ T1042]  ? __dev_close_many (net/core/dev.c:1949)
[   66.799615][ T1042]  ? netif_close_many_and_unlock (net/core/dev.c:12476)
[   66.799620][ T1042]  unregister_netdevice_many_notify (net/core/dev.c:12545)
[   66.799625][ T1042]  ? vxlan_dellink (drivers/net/vxlan/vxlan_core.c:4480) vxlan
[   66.799644][ T1042]  ? vxlan_fdb_delete_bulk (drivers/net/vxlan/vxlan_core.c:4480) vxlan
[   66.799657][ T1042]  ? dev_ingress_queue_create (net/core/dev.c:12499)
[   66.799662][ T1042]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.799670][ T1042]  ? __nla_validate_parse (./include/net/netlink.h:1307 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[   66.799687][ T1042]  rtnl_dellink (net/core/rtnetlink.c:3530 net/core/rtnetlink.c:3570)
[   66.799693][ T1042]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   66.799711][ T1042]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   66.799716][ T1042]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.799722][ T1042]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   66.799726][ T1042]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   66.799729][ T1042]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   66.799733][ T1042]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   66.799736][ T1042]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   66.799740][ T1042]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   66.799742][ T1042]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.799750][ T1042]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   66.799755][ T1042]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   66.799759][ T1042]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   66.799766][ T1042]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   66.799768][ T1042]  ? 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)
[   66.799772][ T1042]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   66.799777][ T1042]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   66.799780][ T1042]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.799786][ T1042]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   66.799790][ T1042]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   66.799794][ T1042]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   66.799800][ T1042]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   66.799803][ T1042]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   66.799811][ T1042]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   66.799816][ T1042]  ? __copy_msghdr (net/socket.c:2556)
[   66.799823][ T1042]  ___sys_sendmsg (net/socket.c:2686)
[   66.799826][ T1042]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   66.799829][ T1042]  ? __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)
[   66.799840][ T1042]  ? copy_msghdr_from_user (net/socket.c:2673)
[   66.799845][ T1042]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   66.799849][ T1042]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.799855][ T1042]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   66.799859][ T1042]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   66.799869][ T1042]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   66.799875][ T1042]  __sys_sendmsg (net/socket.c:2716)
[   66.799878][ T1042]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   66.799882][ T1042]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   66.799890][ T1042]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   66.799894][ T1042]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   66.799901][ T1042]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   66.799907][ T1042] RIP: 0033:0x7f46ee2901d7
[   66.799914][ T1042] 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)
[   66.799917][ T1042] RSP: 002b:00007ffcf96b8b28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   66.799922][ T1042] RAX: ffffffffffffffda RBX: 00007ffcf96b9250 RCX: 00007f46ee2901d7
[   66.799925][ T1042] RDX: 0000000000000000 RSI: 00007ffcf96b8b90 RDI: 0000000000000005
[   66.799926][ T1042] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   66.799928][ T1042] R10: 00007f46ee18cf60 R11: 0000000000000246 R12: 0000000000000002
[   66.799930][ T1042] R13: 00000000691ccf55 R14: 0000000000499600 R15: 0000000000000000
| [   66.817723][ T1042] #PF: error_code(0x0002) - not-present page
| [   66.817944][ T1042] PGD ecfd067 P4D ecfd067 PUD debf067 PMD 0
| [   66.818189][ T1042] Oops: Oops: 0002 [#1] SMP KASAN
| [   66.818873][ T1042] Tainted: [B]=BAD_PAGE
[   66.819011][ T1042] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   66.819251][ T1042] 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)
[   66.819509][ T1042] 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
[   66.820355][ T1042] RSP: 0018:ffffc9000171ef18 EFLAGS: 00010046
[   66.820597][ T1042] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffb5a4090a
[   66.820979][ T1042] RDX: fffffbfff738f2cd RSI: 0000000000000008 RDI: ffffffffb9c79660
[   66.821259][ T1042] RBP: ffffc9000171ef80 R08: 0000000000000001 R09: fffffbfff738f2cc
[   66.821552][ T1042] R10: ffffffffb9c79667 R11: ffffc9000171ea00 R12: 0000000000000000
[   66.821946][ T1042] R13: 0000000000000286 R14: ffff88800904a000 R15: dffffc0000000000
[   66.822228][ T1042] FS:  00007f46ee0c2800(0000) GS:ffff88807c5f2000(0000) knlGS:0000000000000000
[   66.822666][ T1042] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   66.822908][ T1042] CR2: 0000000000000000 CR3: 0000000008a84003 CR4: 0000000000772ef0
[   66.823191][ T1042] PKRU: 55555554
[   66.823336][ T1042] Call Trace:
[   66.823590][ T1042]  <TASK>
[   66.823693][ T1042]  __cancel_work (kernel/workqueue.c:2161 kernel/workqueue.c:4364)
[   66.823884][ T1042]  ? enable_delayed_work (kernel/workqueue.c:4359)
[   66.824079][ T1042]  __cancel_work_sync (kernel/workqueue.c:4383)
[   66.824262][ T1042]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[   66.824562][ T1042]  ? netdev_notify_peers (net/core/dev.c:1891)
[   66.824759][ T1042]  ? netif_close_many (net/core/dev.c:1959)
[   66.824940][ T1042]  netif_close_many (net/core/dev.c:1959)
[   66.825128][ T1042]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194)
[   66.825476][ T1042]  ? __dev_close_many (net/core/dev.c:1949)
[   66.825658][ T1042]  ? netif_close_many_and_unlock (net/core/dev.c:12476)
[   66.825891][ T1042]  unregister_netdevice_many_notify (net/core/dev.c:12545)
[   66.826229][ T1042]  ? vxlan_dellink (drivers/net/vxlan/vxlan_core.c:4480) vxlan
[   66.826454][ T1042]  ? vxlan_fdb_delete_bulk (drivers/net/vxlan/vxlan_core.c:4480) vxlan
[   66.826697][ T1042]  ? dev_ingress_queue_create (net/core/dev.c:12499)
[   66.826881][ T1042]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.827176][ T1042]  ? __nla_validate_parse (./include/net/netlink.h:1307 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[   66.827372][ T1042]  rtnl_dellink (net/core/rtnetlink.c:3530 net/core/rtnetlink.c:3570)
[   66.827563][ T1042]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   66.827913][ T1042]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   66.828116][ T1042]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.828301][ T1042]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   66.828500][ T1042]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   66.828785][ T1042]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   66.828970][ T1042]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   66.829202][ T1042]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   66.829403][ T1042]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   66.829734][ T1042]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.829925][ T1042]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   66.830119][ T1042]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   66.830300][ T1042]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   66.830601][ T1042]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   66.830785][ T1042]  ? 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)
[   66.830966][ T1042]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   66.831158][ T1042]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   66.831463][ T1042]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.831649][ T1042]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   66.831828][ T1042]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   66.832010][ T1042]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   66.832303][ T1042]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   66.832506][ T1042]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   66.832689][ T1042]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   66.832911][ T1042]  ? __copy_msghdr (net/socket.c:2556)
[   66.833209][ T1042]  ___sys_sendmsg (net/socket.c:2686)
[   66.833395][ T1042]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   66.833581][ T1042]  ? __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)
[   66.833809][ T1042]  ? copy_msghdr_from_user (net/socket.c:2673)
[   66.834093][ T1042]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   66.834274][ T1042]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.834472][ T1042]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   66.834658][ T1042]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   66.834937][ T1042]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   66.835128][ T1042]  __sys_sendmsg (net/socket.c:2716)
[   66.835306][ T1042]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   66.835652][ T1042]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   66.835837][ T1042]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   66.836017][ T1042]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   66.836213][ T1042]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   66.836575][ T1042] RIP: 0033:0x7f46ee2901d7
[   66.836769][ T1042] 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)
[   66.837538][ T1042] RSP: 002b:00007ffcf96b8b28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   66.837821][ T1042] RAX: ffffffffffffffda RBX: 00007ffcf96b9250 RCX: 00007f46ee2901d7
[   66.838101][ T1042] RDX: 0000000000000000 RSI: 00007ffcf96b8b90 RDI: 0000000000000005
[   66.838386][ T1042] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   66.838664][ T1042] R10: 00007f46ee18cf60 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