Comment 15 for bug 1863627

This bug still exists in kernel 5.9.1:

[ 0.000000] Linux version 5.9.1-050901-lowlatency (kernel@kathleen) (gcc (Ubuntu 10.2.0-13ubuntu1) 10.2.0, GNU ld (GNU Binutils for Ubuntu) 2.35.1) #202010170731 SMP PREEMPT Sat Oct 17 07:46:09 UTC 2020
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.9.1-050901-lowlatency root=/dev/mapper/MonVolume2-UbuntuRacine ro vsyscall=none security=apparmor quiet splash vt.handoff=7
[...]
[108952.184116] wlan0: deauthenticating from e4:aa:5d:e0:e5:6f by local choice (Reason: 3=DEAUTH_LEAVING)
[108952.200769] iwlwifi 0000:02:00.0: RF_KILL bit toggled to disable radio.
[108952.200772] iwlwifi 0000:02:00.0: reporting RF_KILL (radio disabled)
[108952.227260] ------------[ cut here ]------------
[108952.227262] UMAC scan UID 0 status was not cleaned
[108952.227289] WARNING: CPU: 2 PID: 57499 at drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c:1246 __iwl_mvm_mac_stop+0x14a/0x150 [iwlmvm]
[108952.227290] Modules linked in: md4 cmac nls_utf8 fscache libdes ccm iwlmvm snd_usb_audio snd_usbmidi_lib pktcdvd uas usb_storage xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp ip6table_mangle ip6table_nat iptable_mangle iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip6table_filter ip6_tables iptable_filter bpfilter bridge stp llc overlay bnep snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic binfmt_misc nls_iso8859_1 snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep mei_hdcp intel_rapl_msr dell_rbtn snd_pcm snd_seq_midi snd_seq_midi_event x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm dell_laptop ledtrig_audio crct10dif_pclmul dell_smm_hwmon uvcvideo snd_rawmidi ghash_clmulni_intel videobuf2_vmalloc videobuf2_memops aesni_intel videobuf2_v4l2 videobuf2_common crypto_simd cryptd glue_helper rapl joydev snd_seq intel_cstate videodev mc btusb btrtl snd_seq_device btbcm btintel input_leds efi_pstore
[108952.227319] mac80211 snd_timer bluetooth i915 ecdh_generic ecc intel_wmi_thunderbolt serio_raw dell_wmi libarc4 dell_smbios drm_kms_helper dcdbas snd cec iwlwifi mei_me dell_wmi_descriptor wmi_bmof soundcore cfg80211 ee1004 rc_core hid_multitouch i2c_algo_bit mei processor_thermal_device fb_sys_fops intel_rapl_common syscopyarea ucsi_acpi sysfillrect intel_xhci_usb_role_switch intel_soc_dts_iosf roles sysimgblt typec_ucsi intel_pch_thermal typec int3403_thermal int340x_thermal_zone intel_hid sparse_keymap mac_hid dell_smo8800 acpi_pad int3400_thermal acpi_thermal_rel sch_fq_codel parport_pc nf_tables nfnetlink ppdev lp parport drm ip_tables x_tables autofs4 usbhid btrfs blake2b_generic xor raid6_pq libcrc32c hid_generic rtsx_pci_sdmmc xhci_pci crc32_pclmul e1000e nvme ahci nvme_core libahci i2c_i801 intel_lpss_pci i2c_smbus intel_lpss idma64 virt_dma xhci_pci_renesas rtsx_pci i2c_hid wmi hid video [last unloaded: cifs]
[108952.227351] CPU: 2 PID: 57499 Comm: NetworkManager Not tainted 5.9.1-050901-lowlatency #202010170731
[108952.227352] Hardware name: Dell Inc. Latitude 5590/0VYDFF, BIOS 1.14.0 07/15/2020
[108952.227361] RIP: 0010:__iwl_mvm_mac_stop+0x14a/0x150 [iwlmvm]
[108952.227363] Code: 9b 04 00 00 74 0e 42 c7 84 a3 fc 17 00 00 00 00 00 00 eb be 44 89 e6 48 c7 c7 88 fa cd c0 c6 05 0c 9b 04 00 01 e8 eb b2 60 c8 <0f> 0b eb d8 66 90 0f 1f 44 00 00 55 48 89 e5 41 56 41 55 41 54 4c
[108952.227364] RSP: 0018:ffffb19a8091bc48 EFLAGS: 00010286
[108952.227366] RAX: 0000000000000000 RBX: ffff99ca968e9ec8 RCX: ffff99ca9e518cc8
[108952.227367] RDX: 00000000ffffffd8 RSI: 0000000000000027 RDI: ffff99ca9e518cc0
[108952.227368] RBP: ffffb19a8091bc60 R08: 0000000000000001 R09: 000000000000097b
[108952.227368] R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000
[108952.227369] R13: ffff99ca968ead48 R14: ffff99ca968e9ec8 R15: ffff99ca968e8ff0
[108952.227371] FS: 00007f00e457f380(0000) GS:ffff99ca9e500000(0000) knlGS:0000000000000000
[108952.227372] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[108952.227373] CR2: 0000556d6a6d9008 CR3: 00000003ef53e002 CR4: 00000000003706e0
[108952.227374] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[108952.227375] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[108952.227375] Call Trace:
[108952.227386] iwl_mvm_mac_stop+0x6a/0x90 [iwlmvm]
[108952.227409] drv_stop+0x34/0x130 [mac80211]
[108952.227433] ieee80211_stop_device+0x46/0x50 [mac80211]
[108952.227453] ieee80211_do_stop+0x551/0x860 [mac80211]
[108952.227457] ? _raw_spin_unlock_bh+0x1e/0x20
[108952.227476] ieee80211_stop+0x1a/0x20 [mac80211]
[108952.227479] __dev_close_many+0x9d/0x110
[108952.227481] dev_close_many+0x85/0x130
[108952.227483] dev_close+0x5e/0x80
[108952.227502] cfg80211_shutdown_all_interfaces+0x77/0xd0 [cfg80211]
[108952.227517] cfg80211_rfkill_set_block+0x26/0x40 [cfg80211]
[108952.227520] rfkill_set_block+0x9b/0x170
[108952.227523] rfkill_fop_write+0x136/0x1e0
[108952.227526] vfs_write+0xcd/0x210
[108952.227528] ksys_write+0xb1/0xe0
[108952.227530] __x64_sys_write+0x1a/0x20
[108952.227533] do_syscall_64+0x38/0x90
[108952.227535] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[108952.227536] RIP: 0033:0x7f00e59f02cf
[108952.227538] Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 2d 44 89 c7 48 89 44 24 08 e8 5c fd ff ff 48
[108952.227539] RSP: 002b:00007ffd14ee7700 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
[108952.227541] RAX: ffffffffffffffda RBX: 000055e2121815c5 RCX: 00007f00e59f02cf
[108952.227542] RDX: 0000000000000008 RSI: 00007ffd14ee7738 RDI: 0000000000000035
[108952.227542] RBP: 0000000000000035 R08: 0000000000000000 R09: 0000000000000001
[108952.227543] R10: 0000000000000000 R11: 0000000000000293 R12: 000055e212e13010
[108952.227544] R13: 0000000000000000 R14: 0000000000000000 R15: 000055e212df8820
[108952.227547] ---[ end trace 4a531882d7fac91e ]---