======================================
| [   36.815753][  T422] ==================================================================
| [   36.816072][  T422] 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)
| [   36.816369][  T422] Write of size 8 at addr 0000000000000000 by task ip/422
| [   36.816594][  T422]
[   36.816720][  T422] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   36.816724][  T422] Call Trace:
[   36.816727][  T422]  <TASK>
[   36.816730][  T422]  dump_stack_lvl (lib/dump_stack.c:123)
[   36.816739][  T422]  ? try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   36.816745][  T422]  kasan_report (mm/kasan/report.c:597)
[   36.816754][  T422]  ? try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   36.816764][  T422]  kasan_check_range (mm/kasan/generic.c:194 mm/kasan/generic.c:200)
[   36.816770][  T422]  try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   36.816775][  T422]  ? __queue_work (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 kernel/workqueue.c:2350)
[   36.816783][  T422]  __cancel_work (kernel/workqueue.c:2161 kernel/workqueue.c:4364)
[   36.816788][  T422]  ? enable_delayed_work (kernel/workqueue.c:4359)
[   36.816796][  T422]  ? queue_delayed_work_on (kernel/workqueue.c:2565 (discriminator 1))
[   36.816800][  T422]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   36.816811][  T422]  __cancel_work_sync (kernel/workqueue.c:4383)
[   36.816817][  T422]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[   36.816827][  T422]  ? netdev_notify_peers (net/core/dev.c:1891)
[   36.816834][  T422]  ? netif_close_many (net/core/dev.c:1959)
[   36.816842][  T422]  netif_close_many (net/core/dev.c:1959)
[   36.816851][  T422]  ? __dev_close_many (net/core/dev.c:1949)
[   36.816858][  T422]  ? netif_close_many_and_unlock (net/core/dev.c:12476)
[   36.816867][  T422]  unregister_netdevice_many_notify (net/core/dev.c:12545)
[   36.816874][  T422]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   36.816882][  T422]  ? dev_ingress_queue_create (net/core/dev.c:12499)
[   36.816886][  T422]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   36.816895][  T422]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   36.816900][  T422]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   36.816908][  T422]  rtnl_dellink (net/core/rtnetlink.c:3530 net/core/rtnetlink.c:3570)
[   36.816915][  T422]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   36.816953][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   36.816963][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   36.816974][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   36.816981][  T422]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   36.816985][  T422]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   36.816993][  T422]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   36.816999][  T422]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   36.817006][  T422]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   36.817011][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   36.817024][  T422]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   36.817031][  T422]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   36.817038][  T422]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   36.817051][  T422]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   36.817056][  T422]  ? 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)
[   36.817063][  T422]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   36.817071][  T422]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   36.817078][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   36.817088][  T422]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   36.817097][  T422]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   36.817103][  T422]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   36.817110][  T422]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   36.817113][  T422]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   36.817118][  T422]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   36.817121][  T422]  ? __copy_msghdr (net/socket.c:2556)
[   36.817128][  T422]  ___sys_sendmsg (net/socket.c:2686)
[   36.817131][  T422]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   36.817134][  T422]  ? __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)
[   36.817140][  T422]  ? copy_msghdr_from_user (net/socket.c:2673)
[   36.817146][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   36.817150][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   36.817156][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   36.817159][  T422]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   36.817164][  T422]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   36.817171][  T422]  __sys_sendmsg (net/socket.c:2716)
[   36.817174][  T422]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   36.817178][  T422]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   36.817186][  T422]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   36.817190][  T422]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   36.817195][  T422]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   36.817199][  T422] RIP: 0033:0x7fad9dc161d7
[   36.817203][  T422] 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)
[   36.817206][  T422] RSP: 002b:00007ffed4c80618 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   36.817210][  T422] RAX: ffffffffffffffda RBX: 00007ffed4c80d40 RCX: 00007fad9dc161d7
[   36.817212][  T422] RDX: 0000000000000000 RSI: 00007ffed4c80680 RDI: 0000000000000005
[   36.817214][  T422] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   36.817215][  T422] R10: 00007fad9db12f60 R11: 0000000000000246 R12: 0000000000000002
[   36.817217][  T422] R13: 00000000691ccbb6 R14: 0000000000499600 R15: 0000000000000000
| [   36.835052][  T422] #PF: error_code(0x0002) - not-present page
| [   36.835347][  T422] PGD dc5e067 P4D dc5e067 PUD 958f067 PMD 0
| [   36.835679][  T422] Oops: Oops: 0002 [#1] SMP KASAN
| [   36.836299][  T422] Tainted: [B]=BAD_PAGE
[   36.836433][  T422] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   36.836646][  T422] 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)
[   36.836875][  T422] 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
[   36.837589][  T422] RSP: 0018:ffffc90000a56f18 EFLAGS: 00010046
[   36.837907][  T422] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff9f04090a
[   36.838166][  T422] RDX: fffffbfff464f2cd RSI: 0000000000000008 RDI: ffffffffa3279660
[   36.838434][  T422] RBP: ffffc90000a56f80 R08: 0000000000000001 R09: fffffbfff464f2cc
[   36.838790][  T422] R10: ffffffffa3279667 R11: ffffc90000a56a00 R12: 0000000000000000
[   36.839048][  T422] R13: 0000000000000286 R14: ffff888008859000 R15: dffffc0000000000
[   36.839303][  T422] FS:  00007fad9da48800(0000) GS:ffff8880930f2000(0000) knlGS:0000000000000000
[   36.839703][  T422] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   36.839922][  T422] CR2: 0000000000000000 CR3: 000000000cca6006 CR4: 0000000000772ef0
[   36.840278][  T422] PKRU: 55555554
[   36.840412][  T422] Call Trace:
[   36.840537][  T422]  <TASK>
[   36.840622][  T422]  ? __queue_work (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 kernel/workqueue.c:2350)
[   36.840800][  T422]  __cancel_work (kernel/workqueue.c:2161 kernel/workqueue.c:4364)
[   36.841076][  T422]  ? enable_delayed_work (kernel/workqueue.c:4359)
[   36.841250][  T422]  ? queue_delayed_work_on (kernel/workqueue.c:2565 (discriminator 1))
[   36.841418][  T422]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   36.841588][  T422]  __cancel_work_sync (kernel/workqueue.c:4383)
[   36.841859][  T422]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[   36.842033][  T422]  ? netdev_notify_peers (net/core/dev.c:1891)
[   36.842197][  T422]  ? netif_close_many (net/core/dev.c:1959)
[   36.842380][  T422]  netif_close_many (net/core/dev.c:1959)
[   36.842645][  T422]  ? __dev_close_many (net/core/dev.c:1949)
[   36.842818][  T422]  ? netif_close_many_and_unlock (net/core/dev.c:12476)
[   36.843033][  T422]  unregister_netdevice_many_notify (net/core/dev.c:12545)
[   36.843240][  T422]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   36.843517][  T422]  ? dev_ingress_queue_create (net/core/dev.c:12499)
[   36.843692][  T422]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   36.843879][  T422]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   36.844046][  T422]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   36.844321][  T422]  rtnl_dellink (net/core/rtnetlink.c:3530 net/core/rtnetlink.c:3570)
[   36.844490][  T422]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   36.844716][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   36.844895][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   36.845167][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   36.845341][  T422]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   36.845511][  T422]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   36.845681][  T422]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   36.845993][  T422]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   36.846160][  T422]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   36.846337][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   36.846606][  T422]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   36.846784][  T422]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   36.846963][  T422]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   36.847132][  T422]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   36.847403][  T422]  ? 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)
[   36.847572][  T422]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   36.847746][  T422]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   36.847922][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   36.848192][  T422]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   36.848376][  T422]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   36.848541][  T422]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   36.848715][  T422]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   36.848991][  T422]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   36.849161][  T422]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   36.849377][  T422]  ? __copy_msghdr (net/socket.c:2556)
[   36.849558][  T422]  ___sys_sendmsg (net/socket.c:2686)
[   36.849731][  T422]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   36.849916][  T422]  ? __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)
[   36.850134][  T422]  ? copy_msghdr_from_user (net/socket.c:2673)
[   36.850307][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   36.850579][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   36.850775][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   36.850954][  T422]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   36.851122][  T422]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   36.851406][  T422]  __sys_sendmsg (net/socket.c:2716)
[   36.851570][  T422]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   36.851802][  T422]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   36.851976][  T422]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   36.852252][  T422]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   36.852423][  T422]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   36.852630][  T422] RIP: 0033:0x7fad9dc161d7
[   36.852920][  T422] 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)
[   36.853521][  T422] RSP: 002b:00007ffed4c80618 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   36.853918][  T422] RAX: ffffffffffffffda RBX: 00007ffed4c80d40 RCX: 00007fad9dc161d7
[   36.854168][  T422] RDX: 0000000000000000 RSI: 00007ffed4c80680 RDI: 0000000000000005
[   36.854530][  T422] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   36.854787][  T422] R10: 00007fad9db12f60 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