I'm also affected by this bug. Running Buster with latest (official) kernel on a Gigabyte Brix GB-EAPD-4200 box. # uname -a Linux brix1 4.19.0-5-amd64 #1 SMP Debian 4.19.37-3 (2019-05-15) x86_64 GNU/ Linux [433951.400223] WARNING: CPU: 2 PID: 402 at drivers/net/wireless/intel/ iwlwifi/mvm/tx.c:1431 iwl_mvm_rx_tx_cmd+0x1e6/0x650 [iwlmvm] [433951.400228] Modules linked in: devlink nf_tables nfnetlink ctr ccm bridge 8021q garp stp mrp llc snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic arc4 nls_ascii nls_cp437 vfat iwlmvm fat intel_rapl btusb btrtl x86_pkg_temp_thermal btbcm mac80211 btintel bluetooth kvm_intel snd_soc_skl kvm snd_soc_skl_ipc irqbypass crct10dif_pclmul snd_soc_sst_ipc iwlwifi snd_soc_sst_dsp crc32_pclmul i915 snd_hda_ext_core snd_soc_acpi_intel_match snd_soc_acpi snd_soc_core cfg80211 evdev snd_compress drbg efi_pstore snd_hda_intel drm_kms_helper snd_hda_codec snd_hda_core ghash_clmulni_intel snd_hwdep intel_cstate mei_me ansi_cprng cdc_ether intel_rapl_perf ecdh_generic wdat_wdt snd_pcm rfkill usbnet drm sg option mei mii usb_wwan snd_timer usbserial ucsi_acpi pcspkr efivars snd typec_ucsi soundcore i2c_algo_bit [433951.400365] typec video pcc_cpufreq button it87 hwmon_vid coretemp efivarfs ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 crc32c_generic fscrypto ecb sd_mod crc32c_intel ahci libahci xhci_pci libata xhci_hcd sdhci_pci cqhci aesni_intel sdhci aes_x86_64 scsi_mod crypto_simd cryptd glue_helper usbcore mmc_core r8169 lpc_ich realtek i2c_i801 libphy usb_common fan i2c_hid thermal hid [433951.400454] CPU: 2 PID: 402 Comm: irq/133-iwlwifi Not tainted 4.19.0-5- amd64 #1 Debian 4.19.37-3 [433951.400456] Hardware name: GIGABYTE GB-EAPD-4200/MZAPLEP-00, BIOS F8 01/18/2018 [433951.400485] RIP: 0010:iwl_mvm_rx_tx_cmd+0x1e6/0x650 [iwlmvm] [433951.400490] Code: 5c 24 28 48 8d 44 24 28 48 39 c3 0f 84 8c 02 00 00 44 0f b6 6c 24 0a c6 44 24 13 00 41 8d 45 ff 66 89 44 24 10 e9 ea 00 00 00 <0f> 0b 81 4b 28 00 01 00 00 45 31 f6 49 8b 47 10 48 8b b0 d0 03 00 [433951.400494] RSP: 0018:ffff9abf012d7d38 EFLAGS: 00010246 [433951.400499] RAX: 0000000000000001 RBX: ffff8bdc353f1c00 RCX: 0000000080150014 [433951.400502] RDX: 0000000080150015 RSI: 0000000000000001 RDI: ffff8bdc37566f00 [433951.400504] RBP: ffff8bdc34294000 R08: ffff8bdc353f1c30 R09: ffffffffc0dbf101 [433951.400507] R10: ffff8bdc30eaf980 R11: 0000000000000001 R12: ffff8bdc35206324 [433951.400510] R13: 0000000000000088 R14: 000000000000170a R15: ffff8bdc3536d548 [433951.400514] FS: 0000000000000000(0000) GS:ffff8bdc37b00000(0000) knlGS: 0000000000000000 [433951.400517] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [433951.400520] CR2: 00007fb1e775c028 CR3: 000000018a20a000 CR4: 00000000003406e0 [433951.400523] Call Trace: [433951.400555] iwl_pcie_rx_handle+0x239/0x860 [iwlwifi] [433951.400579] iwl_pcie_irq_handler+0x183/0x6b0 [iwlwifi] [433951.400589] ? irq_finalize_oneshot.part.43+0x100/0x100 [433951.400595] irq_thread_fn+0x1f/0x60 [433951.400600] irq_thread+0xe7/0x170 [433951.400605] ? irq_forced_thread_fn+0x70/0x70 [433951.400610] ? irq_thread_check_affinity+0xd0/0xd0 [433951.400615] kthread+0x112/0x130 [433951.400620] ? kthread_bind+0x30/0x30 [433951.400628] ret_from_fork+0x35/0x40 [433951.400635] ---[ end trace 703640882042d75e ]---
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