Hi folks. My friend today launched stress-ng multiple times and he could twice time reproduce the odd bug, which looks like a bug in the wifi driver. lspci detects this device as: Network controller: Realtek Semiconductor Co., Ltd. RTL8822BE 802.11a/b/g/n/ac WiFi adapter I decided to report here because every time after this bug happens the system became fully unresponsive. Which is really very annoying. stress-ng-iomix (147381): drop_caches: 3 stress-ng-iomix (147417): drop_caches: 3 stress-ng-iomix (147415): drop_caches: 3 rtw_pci 0000:04:00.0: stop vif ea:01:4e:ce:99:c5 on port 0 rtw_pci 0000:04:00.0: start vif 06:72:1e:97:fc:83 on port 0 BUG: kernel NULL pointer dereference, address: 0000000000000070 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] SMP NOPTI CPU: 1 PID: 819 Comm: irq/76-rtwpci Not tainted 5.5.0-0.rc4.git0.1.fc32.x86_64 #1 Hardware name: System manufacturer System Product Name/ROG STRIX X470-I GAMING, BIOS 3004 12/16/2019 RIP: 0010:rtw_pci_tx_isr+0x96/0x230 [rtwpci] Code: 0e 01 00 00 48 8b 44 24 08 44 0f b6 64 24 13 48 c1 e0 06 49 83 c4 01 48 89 04 24 49 c1 e4 06 49 01 dc 4c 89 e7 e8 8a d1 96 ce <8b> 50 70 48 8b 70 48 49 89 c6 48 8b 03 48 8d b8 b0 00 00 00 48 8b RSP: 0018:ffffad9f00d6fe08 EFLAGS: 00010086 RAX: 0000000000000000 RBX: ffff9b66766e5d68 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000086 RDI: 0000000000000086 RBP: 000000000000006a R08: 0000000000000000 R09: 0000000000000059 R10: 0000000000000000 R11: ffff9b667da6ae38 R12: ffff9b66766e5ee8 R13: ffff9b66766e1e80 R14: 0000000000000005 R15: ffff9b66766e07c0 FS: 0000000000000000(0000) GS:ffff9b667da40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000070 CR3: 0000000333690000 CR4: 00000000003406e0 Call Trace: rtw_pci_interrupt_threadfn+0x15b/0x210 [rtwpci] ? irq_finalize_oneshot.part.0+0xf0/0xf0 irq_thread_fn+0x20/0x60 irq_thread+0xdc/0x170 ? irq_forced_thread_fn+0x80/0x80 kthread+0xf9/0x130 ? irq_thread_check_affinity+0xf0/0xf0 ? kthread_park+0x90/0x90 ret_from_fork+0x22/0x40 Modules linked in: salsa20_generic camellia_generic camellia_aesni_avx2 camellia_aesni_avx_x86_64 camellia_x86_64 cast6_avx_x86_64 cast6_generic cast_common serpent_avx2 serpent_avx_x86_64 serpent_sse2_x86_64 serpent_generic twofish_generic twofish_avx_x86_64 twofish_x86_64_3way twofish_x86_64 twofish_common ofb tgr192 wp512 rmd320 rmd256 rmd160 rmd128 md4 uinput rfcomm xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp tun bridge stp llc nft_objref nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nf_tables_set nft_chain_nat nf_tables ebtable_nat ebtable_broute ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_mangle iptable_raw iptable_security ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter cmac bnep sunrpc snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio rtwpci snd_hda_codec_hdmi rtw88 snd_hda_intel snd_intel_dspcfg edac_mce_amd snd_usb_audio uvcvideo videobuf2_vmalloc videobuf2_memops snd_hda_codec snd_usbmidi_lib videobuf2_v4l2 snd_hda_core videobuf2_common mac80211 btusb snd_rawmidi kvm snd_hwdep btrtl videodev snd_seq btbcm btintel snd_seq_device irqbypass bluetooth cfg80211 snd_pcm eeepc_wmi mc joydev crct10dif_pclmul snd_timer crc32_pclmul asus_wmi ecdh_generic snd sparse_keymap rfkill sp5100_tco ccp ecc video soundcore libarc4 wmi_bmof pcspkr i2c_piix4 ghash_clmulni_intel k10temp gpio_amdpt gpio_generic acpi_cpufreq binfmt_misc ip_tables amdgpu amd_iommu_v2 gpu_sched ttm drm_kms_helper drm igb crc32c_intel uas dca i2c_algo_bit usb_storage wmi pinctrl_amd fuse CR2: 0000000000000070 ---[ end trace 5e058b15ff4e55d6 ]--- # /usr/src/kernels/`uname -r`/scripts/faddr2line /lib/debug/lib/modules/`uname -r`/kernel/drivers/net/wireless/realtek/rtw88/rtwpci.ko.debug rtw_pci_tx_isr+0x96 rtw_pci_tx_isr+0x96/0x230: rtw_pci_tx_isr at /usr/src/debug/kernel-5.4.fc32/linux-5.5.0-0.rc4.git0.1.fc32.x86_64/drivers/net/wireless/realtek/rtw88/pci.c:836 # eu-addr2line -e /lib/debug/lib/modules/`uname -r`/kernel/drivers/net/wireless/realtek/rtw88/rtwpci.ko.debug rtw_pci_tx_isr+0x96 drivers/net/wireless/realtek/rtw88/pci.c:836:3 $ uname -r 5.5.0-0.rc4.git0.1.fc32.x86_64 -- Best Regards, Mike Gavrilov.
