Hello, For a couple of weeks I see following errors printed in dmesg from time to time: iwlwifi 0000:04:00.0: Queue 4 is active on fifo 1 and stuck for 10000 ms. SW [189, 201] HW [189, 201] FH TRB=0x0c01040c8 iwlwifi 0000:04:00.0: Microcode SW error detected. Restarting 0x2000000. iwlwifi 0000:04:00.0: Start IWL Error Log Dump: iwlwifi 0000:04:00.0: Status: 0x00000100, count: 6 iwlwifi 0000:04:00.0: Loaded firmware version: 36.9f0a2d68.0 iwlwifi 0000:04:00.0: 0x00000084 | NMI_INTERRUPT_UNKNOWN iwlwifi 0000:04:00.0: 0x200002B0 | trm_hw_status0 iwlwifi 0000:04:00.0: 0x00000000 | trm_hw_status1 iwlwifi 0000:04:00.0: 0x0002485C | branchlink2 iwlwifi 0000:04:00.0: 0x0003A7CA | interruptlink1 iwlwifi 0000:04:00.0: 0x0003E6A4 | interruptlink2 iwlwifi 0000:04:00.0: 0x00000000 | data1 iwlwifi 0000:04:00.0: 0x00000080 | data2 iwlwifi 0000:04:00.0: 0x07830000 | data3 iwlwifi 0000:04:00.0: 0x82818D06 | beacon time iwlwifi 0000:04:00.0: 0x4E60EC46 | tsf low iwlwifi 0000:04:00.0: 0x00000257 | tsf hi iwlwifi 0000:04:00.0: 0x00000000 | time gp1 iwlwifi 0000:04:00.0: 0xBF706F42 | time gp2 iwlwifi 0000:04:00.0: 0x00000001 | uCode revision type iwlwifi 0000:04:00.0: 0x00000024 | uCode version major iwlwifi 0000:04:00.0: 0x9F0A2D68 | uCode version minor iwlwifi 0000:04:00.0: 0x00000230 | hw version iwlwifi 0000:04:00.0: 0x00489000 | board version iwlwifi 0000:04:00.0: 0x0000001C | hcmd iwlwifi 0000:04:00.0: 0x0222204A | isr0 iwlwifi 0000:04:00.0: 0x00800000 | isr1 iwlwifi 0000:04:00.0: 0x0800180A | isr2 iwlwifi 0000:04:00.0: 0x004000C0 | isr3 iwlwifi 0000:04:00.0: 0x00000000 | isr4 iwlwifi 0000:04:00.0: 0xA138009D | last cmd Id iwlwifi 0000:04:00.0: 0x00000000 | wait_event iwlwifi 0000:04:00.0: 0x00000080 | l2p_control iwlwifi 0000:04:00.0: 0x00011420 | l2p_duration iwlwifi 0000:04:00.0: 0x0000003F | l2p_mhvalid iwlwifi 0000:04:00.0: 0x000000CE | l2p_addr_match iwlwifi 0000:04:00.0: 0x0000000D | lmpm_pmg_sel iwlwifi 0000:04:00.0: 0x04120134 | timestamp iwlwifi 0000:04:00.0: 0x0034B0C8 | flow_handler iwlwifi 0000:04:00.0: 0x00000000 | ADVANCED_SYSASSERT iwlwifi 0000:04:00.0: 0x00000000 | umac branchlink1 iwlwifi 0000:04:00.0: 0x00000000 | umac branchlink2 iwlwifi 0000:04:00.0: 0x00000000 | umac interruptlink1 iwlwifi 0000:04:00.0: 0x00000000 | umac interruptlink2 iwlwifi 0000:04:00.0: 0x00000000 | umac data1 iwlwifi 0000:04:00.0: 0x00000000 | umac data2 iwlwifi 0000:04:00.0: 0x00000000 | umac data3 iwlwifi 0000:04:00.0: 0x00000000 | umac major iwlwifi 0000:04:00.0: 0x00000000 | umac minor iwlwifi 0000:04:00.0: 0x00000000 | frame pointer iwlwifi 0000:04:00.0: 0x00000000 | stack pointer iwlwifi 0000:04:00.0: 0x00000000 | last host cmd iwlwifi 0000:04:00.0: 0x00000000 | isr status reg iwlwifi 0000:04:00.0: mcast filter cmd error. ret=-5 Recently I also saw following warning in Linux 5.0rc5 which happened just after above: WARNING: CPU: 0 PID: 8802 at net/mac80211/offchannel.c:158 ieee80211_offchannel_return+0x18f/0x1a0 [mac80211] Modules linked in: ccm algif_aead cbc des_generic ecb cmac md4 algif_hash hid_sensor_rotation hid_sensor_accel_3d nf_log_ipv4 hid_sensor_als nf_log_common hid_sensor_gyro_3d hid_sensor_magn_3d wacom nft_counter hid_sensor_trigger hid_sensor_iio_common xt_mark industrialio_triggered_buffer ipt_REJECT nf_reject_ipv4 kfifo_buf xt_LOG industrialio xt_addrtype xt_tcpudp snd_soc_skl xt_conntrack nf_conntrack snd_soc_hdac_hda arc4 snd_hda_ext_core nf_defrag_ipv4 snd_soc_acpi_intel_match libcrc32c hid_sensor_hub joydev snd_soc_acpi iwlmvm snd_soc_skl_ipc mousedev nft_compat intel_ishtp_hid snd_soc_sst_ipc intel_rapl intel_wmi_thunderbolt wmi_bmof snd_soc_sst_dsp mac80211 nf_tables x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_hdmi nfnetlink snd_soc_core coretemp snd_hda_codec_conexant snd_hda_codec_generic nls_iso8859_1 nls_cp437 kvm_intel snd_hda_intel vfat iwlwifi fat snd_hda_codec intel_cstate snd_hwdep intel_uncore snd_hda_core psmouse intel_rapl_perf snd_pcm input_leds cfg80211 snd_timer rtsx_pci_ms memstick mei_me mei intel_pch_thermal intel_ish_ipc ucsi_acpi intel_ishtp typec_ucsi typec thinkpad_acpi wmi ledtrig_audio nvram snd soundcore rfkill battery tpm_crb ac i2c_hid evdev tpm_tis tpm_tis_core mac_hid tpm rng_core pcc_cpufreq ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 fscrypto algif_skcipher af_alg hid_logitech_hidpp hid_logitech_dj hid_generic usbhid hid dm_crypt dm_mod crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel rtsx_pci_sdmmc serio_raw mmc_core atkbd aesni_intel libps2 aes_x86_64 crypto_simd cryptd glue_helper xhci_pci rtsx_pci i8042 serio xhci_hcd i915 intel_gtt i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm agpgart kvmgt vfio_mdev mdev vfio_iommu_type1 vfio kvm irqbypass CPU: 0 PID: 8802 Comm: kworker/0:0 Tainted: G T 5.0.0-rc5 #1 Workqueue: events_freezable ieee80211_restart_work [mac80211] RIP: 0010:ieee80211_offchannel_return+0x18f/0x1a0 [mac80211] Code: eb 98 41 83 0f 02 be 10 00 00 00 4c 89 ff e8 d8 22 ff ff e9 69 ff ff ff 31 d2 48 89 de 4c 89 ff e8 76 f6 04 00 e9 57 ff ff ff <0f> 0b 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 40 00 0f 1f 44 00 00 RSP: 0018:ffff99350967fde0 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff8c63172b9f80 RSI: 0000000000000000 RDI: ffff8c6307d907a0 RBP: ffff8c6307d907a0 R08: 0000000000000001 R09: 000000000000038d R10: 0000000000000001 R11: 0000000000000000 R12: ffff8c63075a28a0 R13: ffff8c6307d907a0 R14: 0000000000000000 R15: ffff8c6307d91438 FS: 0000000000000000(0000) GS:ffff8c6319400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00006d1f075aa000 CR3: 000000020900c006 CR4: 00000000003606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __ieee80211_scan_completed+0x1b7/0x3f0 [mac80211] ieee80211_scan_cancel+0xd1/0x1f0 [mac80211] ieee80211_restart_work+0x99/0xf0 [mac80211] process_one_work+0x19b/0x3c0 worker_thread+0x30/0x380 ? process_one_work+0x3c0/0x3c0 kthread+0x113/0x130 ? kthread_park+0x80/0x80 ret_from_fork+0x35/0x40 ---[ end trace 1ba7bbe576255260 ]--- Jordan
