Still happens with linux 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2 (2019-08-28) x86_64 The bug occurs every few days, though I don't know how exactly it is triggered. After it happened the PC is rather unresponsive. I can ping it but new ssh logins no longer work. But ssh sessions opened before the bug seen to continue to work. Is there anything I can do to help tracking this problem down? [ 7075.088754] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068 [ 7075.088774] PGD 0 P4D 0 [ 7075.088787] Oops: 0002 [#1] SMP NOPTI [ 7075.088799] CPU: 0 PID: 1658 Comm: kworker/0:0 Not tainted 4.19.0-6-amd64 #1 Debian 4.19.67-2 [ 7075.088808] Hardware name: GIGABYTE GB-EAPD-4200/MZAPLEP-00, BIOS F8 01/18/2018 [ 7075.088846] Workqueue: events iwl_mvm_add_new_dqa_stream_wk [iwlmvm] [ 7075.088879] RIP: 0010:iwl_trans_pcie_txq_enable+0x5e/0x420 [iwlwifi] [ 7075.088889] Code: 63 c6 4c 8b a4 c7 40 91 00 00 f0 48 0f ab 87 40 a1 00 00 73 0d 80 3d 80 81 02 00 00 0f 84 4c 03 00 00 44 89 c7 e8 12 47 2d cb <49> 89 44 24 68 4d 85 ed 0f 84 b9 02 00 00 0f b6 85 22 a2 00 00 39 [ 7075.088904] RSP: 0018:ffffbd2942797c58 EFLAGS: 00010203 [ 7075.088913] RAX: 00000000000009c4 RBX: 000000000000001f RCX: 0000000000000000 [ 7075.088922] RDX: 0000000000000000 RSI: 000000000000001f RDI: 0000000000002710 [ 7075.088930] RBP: ffff9b5f74070018 R08: 0000000000002710 R09: 0000000000000001 [ 7075.088938] R10: ffff9b5f6fd06868 R11: ffff9b5f73551ff0 R12: 0000000000000000 [ 7075.088946] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 7075.088956] FS: 0000000000000000(0000) GS:ffff9b5f77a00000(0000) knlGS: 0000000000000000 [ 7075.088965] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 7075.088975] CR2: 0000000000000068 CR3: 000000021ae0a000 CR4: 00000000003406f0 [ 7075.088983] Call Trace: [ 7075.089020] iwl_mvm_enable_txq+0x1cf/0x300 [iwlmvm] [ 7075.089056] iwl_mvm_add_new_dqa_stream_wk+0xc47/0x12c0 [iwlmvm] [ 7075.089076] ? __switch_to_asm+0x41/0x70 [ 7075.089086] ? __switch_to_asm+0x35/0x70 [ 7075.089096] ? __switch_to_asm+0x35/0x70 [ 7075.089106] ? __switch_to+0x8c/0x440 [ 7075.089116] ? __switch_to_asm+0x41/0x70 [ 7075.089125] ? __switch_to_asm+0x35/0x70 [ 7075.089138] process_one_work+0x1a7/0x3a0 [ 7075.089150] worker_thread+0x30/0x390 [ 7075.089160] ? create_worker+0x1a0/0x1a0 [ 7075.089169] kthread+0x112/0x130 [ 7075.089178] ? kthread_bind+0x30/0x30 [ 7075.089189] ret_from_fork+0x35/0x40 [ 7075.089199] 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 intel_rapl arc4 fat snd_soc_skl iwlmvm x86_pkg_temp_thermal snd_soc_skl_ipc snd_soc_sst_ipc i915 snd_soc_sst_dsp snd_hda_ext_core snd_soc_acpi_intel_match mac80211 snd_soc_acpi kvm_intel snd_soc_core kvm btusb snd_compress btrtl btbcm btintel irqbypass bluetooth snd_hda_intel crct10dif_pclmul iwlwifi snd_hda_codec crc32_pclmul drbg snd_hda_core ansi_cprng option drm_kms_helper cdc_ether evdev usb_wwan snd_hwdep ghash_clmulni_intel usbnet intel_cstate mii snd_pcm efi_pstore cfg80211 drm ecdh_generic wdat_wdt intel_rapl_perf usbserial sg snd_timer ucsi_acpi snd mei_me rfkill typec_ucsi pcc_cpufreq efivars mei pcspkr [ 7075.089387] i2c_algo_bit soundcore typec 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 aesni_intel sdhci_pci ahci cqhci libahci aes_x86_64 sdhci crypto_simd cryptd glue_helper libata mmc_core i2c_i801 lpc_ich usb_common r8169 scsi_mod realtek libphy fan thermal i2c_hid hid [ 7075.089498] CR2: 0000000000000068 [ 7075.089507] ---[ end trace 5e759e88c3da4c33 ]--- [ 7075.146121] RIP: 0010:iwl_trans_pcie_txq_enable+0x5e/0x420 [iwlwifi] [ 7075.146136] Code: 63 c6 4c 8b a4 c7 40 91 00 00 f0 48 0f ab 87 40 a1 00 00 73 0d 80 3d 80 81 02 00 00 0f 84 4c 03 00 00 44 89 c7 e8 12 47 2d cb <49> 89 44 24 68 4d 85 ed 0f 84 b9 02 00 00 0f b6 85 22 a2 00 00 39 [ 7075.146153] RSP: 0018:ffffbd2942797c58 EFLAGS: 00010203 [ 7075.146163] RAX: 00000000000009c4 RBX: 000000000000001f RCX: 0000000000000000 [ 7075.146172] RDX: 0000000000000000 RSI: 000000000000001f RDI: 0000000000002710 [ 7075.146181] RBP: ffff9b5f74070018 R08: 0000000000002710 R09: 0000000000000001 [ 7075.146190] R10: ffff9b5f6fd06868 R11: ffff9b5f73551ff0 R12: 0000000000000000 [ 7075.146198] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 7075.146208] FS: 0000000000000000(0000) GS:ffff9b5f77a00000(0000) knlGS: 0000000000000000 [ 7075.146219] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 7075.146227] CR2: 0000000000000068 CR3: 0000000271d58000 CR4: 00000000003406f0
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