Immediately after a crash and forced poweroff, I ran "journalctl -b -1", which I've pasted below (minus the huge amount of systemd-udevd logs which are likely irrelevant). The freeze always happens in VLC, and indeed the logs show VLC failures at the end of the logs.
I should also note that I'm using glitchy cheap chinese bluetooth speakers. No matter what device connects to these speakers (phones and various laptops), the sound often dies and I have to disconnect and reconnect the bluetooth session to recover. I doubt that's related but mention it for completeness. When VLC can bring down the whole platform, that seems like a serious problem with the kernel. Regardless of how badly an app like VLC behaves, it shouldn't be able to freeze the whole system. --- Aug 21 08:53:40 hostname kernel: microcode: microcode updated early to revision 0x368, date = 2019-04-23 Aug 21 08:53:40 hostname kernel: Linux version 5.4.0-42-generic (buildd@lgw01-amd64-038) (gcc version 9.3.0 (Ubuntu 9.3.0-10ubuntu2)) #46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020 (Ubuntu 5.4.0-42.46-generic 5.4.44) Aug 21 08:53:40 hostname kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-5.4.0-42-generic root=UUID=(redacted) ro quiet splash vt.handoff=7 Aug 21 08:53:40 hostname kernel: KERNEL supported cpus: Aug 21 08:53:40 hostname kernel: Intel GenuineIntel Aug 21 08:53:40 hostname kernel: AMD AuthenticAMD Aug 21 08:53:40 hostname kernel: Hygon HygonGenuine Aug 21 08:53:40 hostname kernel: Centaur CentaurHauls Aug 21 08:53:40 hostname kernel: zhaoxin Shanghai Aug 21 08:53:40 hostname kernel: x86/fpu: x87 FPU will use FXSAVE (...) [copious systemd-udevd logs snipped] Aug 21 09:19:11 hostname systemd-udevd[4206]: value '[dmi/id]sys_vendor' is 'Dell Inc.' Aug 21 09:19:11 hostname systemd-udevd[4205]: ext4_inode_cache(357:console-setup.service): Device (SEQNUM=7613, ACTION=remove) processed Aug 21 09:19:11 hostname systemd-udevd[4205]: ext4_inode_cache(357:console-setup.service): sd-device-monitor: Passed 164 byte to netlink monitor Aug 21 09:19:11 hostname systemd-udevd[4206]: ext4_inode_cache(1161:NetworkManager-dispatcher.service): Device (SEQNUM=7614, ACTION=remove) processed Aug 21 09:19:11 hostname systemd-udevd[4206]: ext4_inode_cache(1161:NetworkManager-dispatcher.service): sd-device-monitor: Passed 177 byte to netlink monitor Aug 21 09:19:14 hostname systemd-udevd[325]: Cleanup idle workers Aug 21 09:19:14 hostname systemd-udevd[4205]: Unload module index Aug 21 09:19:14 hostname systemd-udevd[4205]: Unloaded link configuration context. Aug 21 09:19:14 hostname systemd-udevd[4206]: Unload module index Aug 21 09:19:14 hostname systemd-udevd[4206]: Unloaded link configuration context. Aug 21 09:19:14 hostname systemd-udevd[325]: Worker [4205] exited Aug 21 09:19:14 hostname systemd-udevd[325]: Worker [4206] exited Aug 21 09:19:23 hostname vlc.desktop[2577]: [00005591dba78700] main audio output error: too low audio sample frequency (0) Aug 21 09:19:23 hostname vlc.desktop[2577]: [00007fb34d0176b0] main decoder error: failed to create audio output Aug 21 09:19:23 hostname vlc.desktop[2577]: [00007fb34c009260] ts demux error: libdvbpsi error (PSI decoder): TS discontinuity (received 11, expected 10) for PID 0 Aug 21 09:19:23 hostname vlc.desktop[2577]: [00007fb34d01d6b0] main decoder error: buffer deadlock prevented Aug 21 09:19:23 hostname vlc.desktop[2577]: [00007fb34d0176b0] main decoder error: buffer deadlock prevented Aug 21 09:19:34 hostname pkexec[4257]: pam_unix(polkit-1:session): session opened for user root by (uid=1000) Aug 21 09:19:34 hostname pkexec[4257]: blee: Executing command [USER=root] [TTY=unknown] [CWD=/home/blee] [COMMAND=/usr/lib/update-notifier/package-system-locked] Aug 21 09:19:35 hostname vlc.desktop[2577]: [00005591dba78700] main audio output error: too low audio sample frequency (0) Aug 21 09:19:35 hostname vlc.desktop[2577]: [00007fb38101ca10] main decoder error: failed to create audio output Aug 21 09:19:35 hostname vlc.desktop[2577]: [00007fb3800050e0] ts demux error: libdvbpsi error (PSI decoder): TS discontinuity (received 11, expected 10) for PID 0 Aug 21 09:19:35 hostname vlc.desktop[2577]: [00007fb38100b580] main decoder error: buffer deadlock prevented Aug 21 09:19:35 hostname vlc.desktop[2577]: [00007fb38101ca10] main decoder error: buffer deadlock prevented Aug 21 09:19:41 hostname vlc.desktop[2577]: [00005591dba78700] main audio output error: too low audio sample frequency (0) Aug 21 09:19:41 hostname vlc.desktop[2577]: [00007fb35d018870] main decoder error: failed to create audio output Aug 21 09:19:41 hostname vlc.desktop[2577]: [00007fb35c003480] ts demux error: libdvbpsi error (PSI decoder): TS discontinuity (received 11, expected 10) for PID 0 Aug 21 09:19:42 hostname vlc.desktop[2577]: [00007fb35c006f30] main decoder error: buffer deadlock prevented Aug 21 09:19:42 hostname vlc.desktop[2577]: [00007fb35d018870] main decoder error: buffer deadlock prevented Aug 21 09:19:46 hostname vlc.desktop[2577]: [00005591dba78700] main audio output error: too low audio sample frequency (0) Aug 21 09:19:46 hostname vlc.desktop[2577]: [00007fb3a4094a70] main decoder error: failed to create audio output Aug 21 09:19:46 hostname vlc.desktop[2577]: [00007fb3a40159e0] ts demux error: libdvbpsi error (PSI decoder): TS discontinuity (received 3, expected 0) for PID 0 Aug 21 09:19:46 hostname vlc.desktop[2577]: [00007fb3a40159e0] ts demux error: libdvbpsi error (PSI decoder): TS discontinuity (received 14, expected 11) for PID 80 Aug 21 09:19:46 hostname vlc.desktop[2577]: [00005591dba78700] vlcpulse audio output error: digital pass-through stream connection failure: Not supported Aug 21 09:19:46 hostname vlc.desktop[2577]: [00005591dba78700] main audio output error: module not functional Aug 21 09:19:46 hostname vlc.desktop[2577]: [00007fb3a4094a70] main decoder error: failed to create audio output Aug 21 09:19:47 hostname vlc.desktop[2577]: libva info: VA-API version 1.7.0 Aug 21 09:19:47 hostname vlc.desktop[2577]: libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so Aug 21 09:19:47 hostname vlc.desktop[2577]: libva info: Found init function __vaDriverInit_1_7 Aug 21 09:19:47 hostname vlc.desktop[2577]: libva error: /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so init failed Aug 21 09:19:47 hostname vlc.desktop[2577]: libva info: va_openDriver() returns 1 Aug 21 09:19:47 hostname vlc.desktop[2577]: libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so Aug 21 09:19:47 hostname vlc.desktop[2577]: libva info: Found init function __vaDriverInit_1_6 Aug 21 09:19:47 hostname vlc.desktop[2577]: libva info: va_openDriver() returns 0 Aug 21 09:19:47 hostname vlc.desktop[2577]: [00007fb3a4094f10] avcodec decoder: Using Intel i965 driver for Intel(R) CherryView - 2.4.0 for hardware decoding Aug 21 09:21:01 hostname CRON[4334]: pam_unix(cron:session): session opened for user root by (uid=0) Aug 21 09:21:01 hostname CRON[4335]: (root) CMD ( test -x /etc/cron.daily/popularity-contest && /etc/cron.daily/popularity-contest --crond) Aug 21 09:21:01 hostname CRON[4334]: pam_unix(cron:session): session closed for user root -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1889992 Title: Ubuntu Focal Fossa freezes spontaneously -- must power off when this happens Status in linux package in Ubuntu: Incomplete Bug description: I just did a fresh first-time install of Ubuntu on a Dell Inspirion 14 with no modifications apart from installing Canon printer drivers and no 3rd party peripherals. The desktop freezes spontaneously. When it freezes, the display freezes including the mouse pointer, and all keystrokes are unresponsive (can't even do ctrl-alt-F3 to get a tty). Forced power off is the only possible action. I think this is irrelevent, but I'll mention that (I think) the lockup only happens when I'm using VLC to play MythTV-served videos from the LAN. Nothing else is running.. not even a browser. I'm simply watching a video and out of the blue it hangs. After rebooting, I play the same video I was watching just before the hang, and finish watching without a freeze up. Which means there's no relation to the video data. $ inxi -Fxz System: Kernel: 5.4.0-42-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: Gnome 3.36.3 Distro: Ubuntu 20.04.1 LTS (Focal Fossa) Machine: Type: Portable System: Dell product: Inspiron 14-3452 v: 4.0.7 serial: <filter> Mobo: Dell model: 0625M8 v: A00 serial: <filter> UEFI: Dell v: 4.0.7 date: 04/26/2016 Battery: ID-1: BAT0 charge: 33.6 Wh condition: 33.6/41.4 Wh (81%) model: Samsung SD DELL 07G075A status: Full CPU: Topology: Dual Core model: Intel Celeron N3050 bits: 64 type: MCP arch: Airmont rev: 3 L2 cache: 1024 KiB flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 6400 Speed: 1377 MHz min/max: 480/2160 MHz Core speeds (MHz): 1: 1034 2: 1139 Graphics: Device-1: Intel Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics vendor: Dell driver: i915 v: kernel bus ID: 00:02.0 Display: server: X.Org 1.19.2 driver: i915 resolution: 1280x800~60Hz OpenGL: renderer: llvmpipe (LLVM 10.0.0 128 bits) v: 3.3 Mesa 20.0.8 direct render: Yes Audio: Device-1: Intel Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series High Definition Audio vendor: Dell driver: snd_hda_intel v: kernel bus ID: 00:1b.0 Sound Server: ALSA v: k5.4.0-42-generic Network: Device-1: Realtek RTL8723BE PCIe Wireless Network Adapter driver: rtl8723be v: kernel port: e000 bus ID: 01:00.0 IF: wlp1s0 state: up mac: <filter> Drives: Local Storage: total: 29.12 GiB used: 8.75 GiB (30.0%) ID-1: /dev/mmcblk0 model: HBG4e size: 29.12 GiB Partition: ID-1: / size: 28.05 GiB used: 8.74 GiB (31.2%) fs: ext4 dev: /dev/mmcblk0p2 Sensors: System Temperatures: cpu: 52.0 C mobo: 47.0 C Fan Speeds (RPM): cpu: 3181 Info: Processes: 199 Uptime: 41m Memory: 1.85 GiB used: 891.8 MiB (46.9%) Init: systemd runlevel: 5 Compilers: gcc: N/A Shell: bash v: 5.0.17 inxi: 3.0.38 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1889992/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
