RAX: ffffffffffffffda RBX: 000000000002ba40 RCX: 000000000045deb9
RDX: 0000000000000000 RSI: 00000000200006c0 RDI: 0000000000000003
RBP: 00007f407b102ca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000a
R13: 00007fff96ec695f R14: 00007f407b1039c0 R15: 000000000118bf2c
BUG: unable to handle kernel NULL pointer dereference at 0000000000000088
IP: test_and_set_bit arch/x86/include/asm/bitops.h:220 [inline]
IP: try_to_grab_pending+0xc3/0x610 kernel/workqueue.c:1230
PGD 9bcec067 P4D 9bcec067 PUD 9e0e9067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.14.203-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events cfg80211_destroy_iface_wk
task: ffff8880b54aa4c0 task.stack: ffff8880b54b0000
RIP: 0010:test_and_set_bit arch/x86/include/asm/bitops.h:220 [inline]
RIP: 0010:try_to_grab_pending+0xc3/0x610 kernel/workqueue.c:1230
RSP: 0018:ffff8880b54b7960 EFLAGS: 00010097
RAX: ffff8880b54aa4c0 RBX: 0000000000000088 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880b54aad0c
RBP: ffff8880b54b79d0 R08: ffffffff8ae0a6b4 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000297 R14: dffffc0000000011 R15: ffff8880b54aa4c0
FS:  0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000088 CR3: 00000000a3297000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __cancel_work_timer+0x90/0x460 kernel/workqueue.c:2923
 rhashtable_free_and_destroy+0x26/0x710 lib/rhashtable.c:1073
 mesh_table_free net/mac80211/mesh_pathtbl.c:70 [inline]
 mesh_pathtbl_unregister+0x42/0xa0 net/mac80211/mesh_pathtbl.c:906
 ieee80211_teardown_sdata+0x1e2/0x290 net/mac80211/iface.c:1142
 rollback_registered_many+0x83f/0xba0 net/core/dev.c:7217
 rollback_registered+0xca/0x170 net/core/dev.c:7245
 unregister_netdevice_queue+0x1b4/0x360 net/core/dev.c:8266
 unregister_netdevice include/linux/netdevice.h:2442 [inline]
 ieee80211_if_remove+0x1fc/0x2b0 net/mac80211/iface.c:1933
 ieee80211_del_iface+0x12/0x20 net/mac80211/cfg.c:143
 rdev_del_virtual_intf net/wireless/rdev-ops.h:57 [inline]
 cfg80211_destroy_ifaces+0xee/0x690 net/wireless/core.c:317
 cfg80211_destroy_iface_wk+0x1a/0x20 net/wireless/core.c:329
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 4b 04 00 00 4c 89 6d 00 e8 db 1b 0b 00 45 84 e4 0f 85 71 01 00 00 e8 5d 3e 20 00 <f0> 48 0f ba 2b 00 72 1a 45 31 e4 e8 4d 3e 20 00 44 89 e0 48 83 
RIP: test_and_set_bit arch/x86/include/asm/bitops.h:220 [inline] RSP: ffff8880b54b7960
RIP: try_to_grab_pending+0xc3/0x610 kernel/workqueue.c:1230 RSP: ffff8880b54b7960
CR2: 0000000000000088
---[ end trace cd80bd19391b97ed ]---