RDX: 0000000000000000 RSI: 00000000200006c0 RDI: 0000000000000004
RBP: 00007f646397e1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd1651c8af R14: 00007f646397e300 R15: 0000000000022000
BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
PGD 27127067 P4D 27127067 PUD 2732a067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 29159 Comm: kworker/0:1 Not tainted 4.19.206-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events cfg80211_destroy_iface_wk
RIP: 0010:test_and_set_bit arch/x86/include/asm/bitops.h:209 [inline]
RIP: 0010:try_to_grab_pending+0xcd/0x6f0 kernel/workqueue.c:1229
Code: 3c 02 00 0f 85 26 05 00 00 4c 89 6d 00 e8 5b 51 29 00 31 ff 44 89 e6 e8 91 2a 24 00 45 84 e4 0f 85 da 01 00 00 e8 53 29 24 00 <f0> 48 0f ba 2b 00 41 0f 92 c4 31 ff 44 89 e6 e8 6f 2a 24 00 45 84
RSP: 0018:ffff888091c5f870 EFLAGS: 00010093
RAX: ffff8880383ba5c0 RBX: 0000000000000080 RCX: ffffffff813e695f
RDX: 0000000000000000 RSI: ffffffff813e696d RDI: 0000000000000001
RBP: ffff888091c5f8e8 R08: 0000000000400000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000293 R14: dffffc0000000010 R15: ffff8880383ba5c0
FS:  0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 000000003865a000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __cancel_work_timer+0xa6/0x590 kernel/workqueue.c:2972
 rhashtable_free_and_destroy+0x2b/0x970 lib/rhashtable.c:1145
 mesh_table_free net/mac80211/mesh_pathtbl.c:73 [inline]
 mesh_pathtbl_unregister+0x42/0xa0 net/mac80211/mesh_pathtbl.c:825
 ieee80211_teardown_sdata net/mac80211/iface.c:1122 [inline]
 ieee80211_uninit+0x7e/0x90 net/mac80211/iface.c:1127
 rollback_registered_many+0x927/0xe70 net/core/dev.c:8210
 rollback_registered+0xe9/0x1b0 net/core/dev.c:8238
 unregister_netdevice_queue+0x1de/0x3e0 net/core/dev.c:9305
 unregister_netdevice include/linux/netdevice.h:2615 [inline]
 ieee80211_if_remove+0x213/0x390 net/mac80211/iface.c:1920
 ieee80211_del_iface+0x12/0x20 net/mac80211/cfg.c:144
 rdev_del_virtual_intf net/wireless/rdev-ops.h:57 [inline]
 cfg80211_destroy_ifaces+0x1d0/0x750 net/wireless/core.c:317
 cfg80211_destroy_iface_wk+0x1a/0x20 net/wireless/core.c:329
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
CR2: 0000000000000080
---[ end trace f6cbce61e302dd6c ]---
RIP: 0010:test_and_set_bit arch/x86/include/asm/bitops.h:209 [inline]
RIP: 0010:try_to_grab_pending+0xcd/0x6f0 kernel/workqueue.c:1229
Code: 3c 02 00 0f 85 26 05 00 00 4c 89 6d 00 e8 5b 51 29 00 31 ff 44 89 e6 e8 91 2a 24 00 45 84 e4 0f 85 da 01 00 00 e8 53 29 24 00 <f0> 48 0f ba 2b 00 41 0f 92 c4 31 ff 44 89 e6 e8 6f 2a 24 00 45 84
RSP: 0018:ffff888091c5f870 EFLAGS: 00010093
RAX: ffff8880383ba5c0 RBX: 0000000000000080 RCX: ffffffff813e695f
RDX: 0000000000000000 RSI: ffffffff813e696d RDI: 0000000000000001
RBP: ffff888091c5f8e8 R08: 0000000000400000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000293 R14: dffffc0000000010 R15: ffff8880383ba5c0
FS:  0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 000000003865a000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	3c 02                	cmp    $0x2,%al
   2:	00 0f                	add    %cl,(%rdi)
   4:	85 26                	test   %esp,(%rsi)
   6:	05 00 00 4c 89       	add    $0x894c0000,%eax
   b:	6d                   	insl   (%dx),%es:(%rdi)
   c:	00 e8                	add    %ch,%al
   e:	5b                   	pop    %rbx
   f:	51                   	push   %rcx
  10:	29 00                	sub    %eax,(%rax)
  12:	31 ff                	xor    %edi,%edi
  14:	44 89 e6             	mov    %r12d,%esi
  17:	e8 91 2a 24 00       	callq  0x242aad
  1c:	45 84 e4             	test   %r12b,%r12b
  1f:	0f 85 da 01 00 00    	jne    0x1ff
  25:	e8 53 29 24 00       	callq  0x24297d
* 2a:	f0 48 0f ba 2b 00    	lock btsq $0x0,(%rbx) <-- trapping instruction
  30:	41 0f 92 c4          	setb   %r12b
  34:	31 ff                	xor    %edi,%edi
  36:	44 89 e6             	mov    %r12d,%esi
  39:	e8 6f 2a 24 00       	callq  0x242aad
  3e:	45                   	rex.RB
  3f:	84                   	.byte 0x84