I also get this bug from time to time. The box is operating as a hotspot with hostapd. # uname -a Linux brix1.sabanet.at 4.19.0-5-amd64 #1 SMP Debian 4.19.37-5+deb10u2 (2019-08-08) x86_64 GNU/Linux # less /var/log/syslog.1 [...] Sep 4 20:10:55 brix1 hostapd: wlan_ap0: STA d8:68:c3:a1:a8:5f IEEE 802.11: authenticated Sep 4 20:10:55 brix1 hostapd: wlan_ap0: STA d8:68:c3:a1:a8:5f IEEE 802.11: associated (aid 7) Sep 4 20:10:55 brix1 hostapd: wlan_ap0: STA d8:68:c3:a1:a8:5f RADIUS: starting accounting session 2AAF52FCD5713118 Sep 4 20:10:55 brix1 hostapd: wlan_ap0: STA d8:68:c3:a1:a8:5f WPA: pairwise key handshake completed (RSN) Sep 4 20:10:55 brix1 kernel: [342104.421804] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068 Sep 4 20:10:55 brix1 kernel: [342104.421826] PGD 0 P4D 0 Sep 4 20:10:55 brix1 kernel: [342104.421839] Oops: 0002 [#1] SMP NOPTI Sep 4 20:10:55 brix1 kernel: [342104.421851] CPU: 3 PID: 18804 Comm: kworker/ 3:1 Not tainted 4.19.0-5-amd64 #1 Debian 4.19.37-5+deb10u2 Sep 4 20:10:55 brix1 kernel: [342104.421862] Hardware name: GIGABYTE GB- EAPD-4200/MZAPLEP-00, BIOS F8 01/18/2018 Sep 4 20:10:55 brix1 kernel: [342104.421899] Workqueue: events iwl_mvm_add_new_dqa_stream_wk [iwlmvm] Sep 4 20:10:55 brix1 kernel: [342104.421931] RIP: 0010:iwl_trans_pcie_txq_enable+0x5e/0x430 [iwlwifi] Sep 4 20:10:55 brix1 kernel: [342104.421942] Code: 63 c6 4c 8b a4 c7 40 91 00 00 f0 48 0f ab 87 40 a1 00 00 73 0d 80 3d 64 62 02 00 00 0f 84 4c 03 00 00 44 89 c7 e8 12 7a 91 c8 <49> 89 44 24 68 4d 85 ed 0f 84 b9 02 00 00 0f b6 85 22 a2 00 00 39 Sep 4 20:10:55 brix1 kernel: [342104.421958] RSP: 0018:ffffb3f98498fc68 EFLAGS: 00010203 Sep 4 20:10:55 brix1 kernel: [342104.421967] RAX: 00000000000009c4 RBX: 000000000000001f RCX: 0000000000000000 Sep 4 20:10:55 brix1 kernel: [342104.421977] RDX: 0000000000000000 RSI: 000000000000001f RDI: 0000000000002710 Sep 4 20:10:55 brix1 kernel: [342104.421986] RBP: ffff93bded3b0018 R08: 0000000000002710 R09: 0000000000000001 Sep 4 20:10:55 brix1 kernel: [342104.421995] R10: 000000000000000a R11: ffff93bdf53c1ff0 R12: 0000000000000000 Sep 4 20:10:55 brix1 kernel: [342104.422004] R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000001f Sep 4 20:10:55 brix1 kernel: [342104.422014] FS: 0000000000000000(0000) GS:ffff93bdf7b80000(0000) knlGS:0000000000000000 Sep 4 20:10:55 brix1 kernel: [342104.422024] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Sep 4 20:10:55 brix1 kernel: [342104.422032] CR2: 0000000000000068 CR3: 000000021320a000 CR4: 00000000003406e0 Sep 4 20:10:55 brix1 kernel: [342104.422041] Call Trace: Sep 4 20:10:55 brix1 kernel: [342104.422062] ? try_to_wake_up+0x54/0x490 Sep 4 20:10:55 brix1 kernel: [342104.422090] iwl_mvm_enable_txq+0x1dc/0x320 [iwlmvm] Sep 4 20:10:55 brix1 kernel: [342104.422126] iwl_mvm_add_new_dqa_stream_wk+0x9a8/0x1180 [iwlmvm] Sep 4 20:10:55 brix1 kernel: [342104.422144] ? __switch_to_asm+0x40/0x70 Sep 4 20:10:55 brix1 kernel: [342104.422153] ? __switch_to_asm+0x40/0x70 Sep 4 20:10:55 brix1 kernel: [342104.422163] ? __switch_to+0x8c/0x440 Sep 4 20:10:55 brix1 kernel: [342104.422172] ? __switch_to_asm+0x34/0x70 Sep 4 20:10:55 brix1 kernel: [342104.422181] ? __switch_to_asm+0x40/0x70 Sep 4 20:10:55 brix1 kernel: [342104.422193] process_one_work+0x1a7/0x3a0 Sep 4 20:10:55 brix1 kernel: [342104.422204] worker_thread+0x30/0x390 Sep 4 20:10:55 brix1 kernel: [342104.422214] ? create_worker+0x1a0/0x1a0 Sep 4 20:10:55 brix1 kernel: [342104.422223] kthread+0x112/0x130 Sep 4 20:10:55 brix1 kernel: [342104.422231] ? kthread_bind+0x30/0x30 Sep 4 20:10:55 brix1 kernel: [342104.422242] ret_from_fork+0x35/0x40 Sep 4 20:10:55 brix1 kernel: [342104.422252] 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 nls_ascii nls_cp437 vfat fat arc4 intel_rapl btusb btrtl btbcm x86_pkg_temp_thermal btintel bluetooth kvm_intel iwlmvm kvm mac80211 irqbypass crct10dif_pclmul snd_soc_skl crc32_pclmul efi_pstore snd_soc_skl_ipc evdev snd_soc_sst_ipc i915 snd_soc_sst_dsp snd_hda_ext_core snd_soc_acpi_intel_match snd_soc_acpi snd_soc_core drbg snd_compress iwlwifi cdc_ether usbnet mii snd_hda_intel ansi_cprng sg ghash_clmulni_intel snd_hda_codec option drm_kms_helper cfg80211 intel_cstate snd_hda_core usb_wwan snd_hwdep usbserial intel_rapl_perf ecdh_generic snd_pcm rfkill pcspkr efivars drm wdat_wdt mei_me snd_timer ucsi_acpi snd typec_ucsi mei soundcore i2c_algo_bit Sep 4 20:10:55 brix1 kernel: [342104.422437] typec pcc_cpufreq video button it87 hwmon_vid coretemp efivarfs ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 crc32c_generic fscrypto ecb sd_mod crc32c_intel xhci_pci xhci_hcd usbcore ahci libahci aesni_intel libata aes_x86_64 crypto_simd cryptd glue_helper sdhci_pci cqhci lpc_ich sdhci i2c_i801 usb_common r8169 scsi_mod mmc_core realtek libphy fan thermal i2c_hid hid Sep 4 20:10:55 brix1 kernel: [342104.422543] CR2: 0000000000000068 Sep 4 20:10:55 brix1 kernel: [342104.422553] ---[ end trace 74fd1f8e20bd8306 ]--- Sep 4 20:10:56 brix1 kernel: [342105.365974] RIP: 0010:iwl_trans_pcie_txq_enable+0x5e/0x430 [iwlwifi] Sep 4 20:10:56 brix1 kernel: [342105.365986] Code: 63 c6 4c 8b a4 c7 40 91 00 00 f0 48 0f ab 87 40 a1 00 00 73 0d 80 3d 64 62 02 00 00 0f 84 4c 03 00 00 44 89 c7 e8 12 7a 91 c8 <49> 89 44 24 68 4d 85 ed 0f 84 b9 02 00 00 0f b6 85 22 a2 00 00 39 Sep 4 20:10:56 brix1 kernel: [342105.365992] RSP: 0018:ffffb3f98498fc68 EFLAGS: 00010203 Sep 4 20:10:56 brix1 kernel: [342105.365996] RAX: 00000000000009c4 RBX: 000000000000001f RCX: 0000000000000000 Sep 4 20:10:56 brix1 kernel: [342105.365999] RDX: 0000000000000000 RSI: 000000000000001f RDI: 0000000000002710 Sep 4 20:10:56 brix1 kernel: [342105.366002] RBP: ffff93bded3b0018 R08: 0000000000002710 R09: 0000000000000001 Sep 4 20:10:56 brix1 kernel: [342105.366005] R10: 000000000000000a R11: ffff93bdf53c1ff0 R12: 0000000000000000 Sep 4 20:10:56 brix1 kernel: [342105.366008] R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000001f Sep 4 20:10:56 brix1 kernel: [342105.366011] FS: 0000000000000000(0000) GS:ffff93bdf7b80000(0000) knlGS:0000000000000000 Sep 4 20:10:56 brix1 kernel: [342105.366015] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Sep 4 20:10:56 brix1 kernel: [342105.366017] CR2: 00007ffe70cf8efc CR3: 000000021320a000 CR4: 00000000003406e0
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