Backtrace

WARNING: CPU: 1 PID: 18369 at drivers/net/wireless/intel/iwlwifi/pcie/trans.c:2084 iwl_trans_pcie_grab_nic_access+0x1af/0x1e0 [iwlwifi]
Modules linked in: rfcomm xt_CHECKSUM xt_MASQUERADE nf_nat_tftp nf_conntrack_tftp nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_REJECT nf_reject_ipv6 ip6t_rpfilter ipt_REJECT nf_reject_ipv4 xt_conntrack ebtable_nat ebtable_broute ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat iptable_mangle iptable_raw iptable_security nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c ccm tun bridge stp llc ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter cmac bnep sunrpc dm_crypt iwlmvm mac80211 btusb btrtl btbcm dell_wmi dell_laptop libarc4 dell_smbios btintel dell_wmi_descriptor wmi_bmof snd_hda_codec_idt snd_hda_codec_generic sparse_keymap dcdbas bluetooth ledtrig_audio iTCO_wdt snd_hda_intel iTCO_vendor_support snd_intel_dspcfg snd_hda_codec snd_hda_core iwlwifi gpio_ich cfg80211 snd_hwdep snd_seq snd_seq_device i2c_i801 joydev ecdh_generic dell_smm_hwmon snd_pcm snd_timer ecc coretemp pcspkr snd rfkill
 soundcore lpc_ich acpi_cpufreq ip_tables i915 i2c_algo_bit cec drm_kms_helper drm ums_realtek uas serio_raw usb_storage sky2 wmi video fuse
CPU: 1 PID: 18369 Comm: kworker/1:11 Tainted: G        W         5.7.15-100.fc31.x86_64 #1
Hardware name: Dell Inc. Inspiron 1545                   /0G848F, BIOS A05 02/25/2009
Workqueue: events cfg80211_rfkill_block_work [cfg80211]
RIP: 0010:iwl_trans_pcie_grab_nic_access+0x1af/0x1e0 [iwlwifi]
Code: 50 ce 49 8d 56 08 bf 00 20 00 00 e8 3b be 9b cc e9 3a ff ff ff 89 c6 48 c7 c7 18 11 76 c0 c6 05 52 ff 02 00 01 e8 c3 e6 99 cc <0f> 0b e9 f5 fe ff ff 48 8b 7d 38 48 c7 c1 80 11 76 c0 31 d2 31 f6
RSP: 0000:ffffb7cd40cdfc08 EFLAGS: 00010096
RAX: 000000000000003d RBX: ffffb7cd40cdfc38 RCX: 0000000000000007
RDX: 0000000000000007 RSI: 0000000000000096 RDI: ffff8b4cba719cc0
RBP: ffff8b4cb76d0028 R08: 0000000000000419 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8b4cb76d260c R14: 00000000000403d8 R15: ffff8b4cb7f114b8
FS:  0000000000000000(0000) GS:ffff8b4cba700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564d5ee4b218 CR3: 00000000b88a8000 CR4: 00000000000406e0
Call Trace:
 iwl_set_bits_prph+0x27/0x80 [iwlwifi]
 iwl_fw_dbg_stop_restart_recording+0x246/0x260 [iwlwifi]
 ? __cancel_work_timer+0xe3/0x160
 __iwl_mvm_mac_stop+0x79/0x150 [iwlmvm]
 iwl_mvm_mac_stop+0xa5/0xc0 [iwlmvm]
 drv_stop+0x34/0x100 [mac80211]
 ieee80211_do_stop+0x54d/0x850 [mac80211]
 ? dev_deactivate_many+0x236/0x280
 ieee80211_stop+0x16/0x20 [mac80211]
 __dev_close_many+0x8e/0xf0
 dev_close_many+0x81/0x120
 dev_close.part.0+0x4e/0x80
 cfg80211_shutdown_all_interfaces+0x71/0xd0 [cfg80211]
 cfg80211_rfkill_block_work+0x1a/0x20 [cfg80211]
 process_one_work+0x1b4/0x380
 worker_thread+0x50/0x3c0
 kthread+0xf9/0x130
 ? process_one_work+0x380/0x380
 ? kthread_park+0x90/0x90
 ret_from_fork+0x35/0x40