Hello!
My Kubuntu18.04.1 machine fatally crashes at random times.
Computer stays on (can hear the fan running), display/screen black and doesn't 'wake' after keyboard press, keyboard locks up (caps lock light not toggling), mouse non-responsive, power button does nothing.
This happens at random intervals during gaming, internet browser use, no use at all (even when just sitting at the login screen). At first I thought it was the CPU/GPUs over-heating, so I began monitoring them, but it happens when they're both hot and 'cold'.
Possibly my GPUs/CPU/thunderbolt display aren't fully-supported, and randomly crash when doing specific registering jobs, etc. I can recreate the behaviour/symptoms by suspending the system to RAM. It refuses to wake, and the same display/keyboard/mouse symptoms show. Syslog shows different issues, depending on if the bug/crash happens during a RAM suspension, or during a random crash. If I suspend to RAM, it doesn't show errors (simply says "starting suspend to ram..." etc. If it's a crash, syslog has some error output (attached below).
See attached what syslog spits out just before the random crash, and when I boot kubuntu back up. Note, hot-plugging an HDMI display during this version of the crash/bug doesn't give me any display/control: randomcrashSyslog[Jan25].txt
Here's a short version from a random crash at a different time (same type) which I believe holds the key errors: randomcrashSHORTSyslog[Jan26].txt
See attached the syslog when the system is manually suspended to RAM:
See attached a syslog when I left the system at the login screen for an hour or so. Screen did go black, and I could not wake it, however the keyboard seemed responsive (caps lock light toggles, etc.). This - to me - seems good evidence that it's either the thunderbolt bus which my display is attached to is not "waking up" right, or the graphics drivers are unable to process the display wake-up process, or both! Logged in successfully with a black screen and used init 6 to reboot: loginscreenblackdisplaySyslog[Jan26].txt
Update: Swapped my thunderbolt display for an HDMI one. Suspend to RAM and the wake-up process works! SO 18.04 doesn't like thunderbolt displays. I'm going to try and reproduce the random crash on the HDMI-display. Just have to leave it on for a while and wait.
Update update: Continues to crash randomly with HDMI display. Here's the syslog: randomcrashHDMIsyslog[Jan26].txt
Same symptoms, different syslog output. The first 'random crash' syslog is most likely the most telling/is of most importance. Nothing seems harmful in syslog just before suspending to RAM.
The system stops logging due to the suspension, but seems to keep logging once the screen goes black on a random crash, so that probably means it's some kind of driver failure instead of a kernel panic or something? I think the suspension not waking and the random crash are two separate, but very similar issues. I have a feeling there's just little support for my RAM/GPU/CPU/Motherboard. I've also attached my system profile. If you need more info, let me know.
Anyways, hopefully someone will have some insight into this, or will be able to point me in the direction of where to make this known to some developers!
Brief Profile
Mac Pro Late 2013 - https://support.apple.com/kb/SP697?locale=en_US
Weird, I know, but I've also got macOS and Windows installed for a triple-boot setup. Super fun, and testing its capabilities!
Processor - Intel Xeon E5 with 25MB L3 cache and Turbo Boost up to 3.9GHz - 3.0GHz 8-Core
Memory - DDR3 ECC memory 3.0GHz 8-Core 64GB (four 16GB)
Graphics - Dual AMD FirePro D300 graphics processors with 2GB of GDDR5 VRAM each - 3.7GHz Quad-Core
System Profile according to command "inxi -Fxz" and "System Profiler and Benchmark" on KDE Discover:
profile[Jan25].txt
Syslog events during random bug/crash with thunderbolt display. Glaring errors here. I think I even cut off it's logging after a couple of minutes of it being black by hard resetting. Next time I'll let it run longer:
randomcrashSyslog[Jan25].txt
The same type of crash, at a different time. Shortened syslog which I believe holds the errors which could help solve the issue:
randomcrashSHORTSyslog[Jan26].txt
The same type of crash, but with only an HDMI display connected.
randomcrashHDMIsyslog[Jan26].txt
Syslog events when screen goes black at login window after a while with thunderbolt display connected. Keyboard was responsive but the display didn't wake. Logged in with black screen and issued init 6 to reboot.
loginscreenblackdisplaySyslog[Jan26].txt
My Kubuntu18.04.1 machine fatally crashes at random times.
Computer stays on (can hear the fan running), display/screen black and doesn't 'wake' after keyboard press, keyboard locks up (caps lock light not toggling), mouse non-responsive, power button does nothing.
This happens at random intervals during gaming, internet browser use, no use at all (even when just sitting at the login screen). At first I thought it was the CPU/GPUs over-heating, so I began monitoring them, but it happens when they're both hot and 'cold'.
Possibly my GPUs/CPU/thunderbolt display aren't fully-supported, and randomly crash when doing specific registering jobs, etc. I can recreate the behaviour/symptoms by suspending the system to RAM. It refuses to wake, and the same display/keyboard/mouse symptoms show. Syslog shows different issues, depending on if the bug/crash happens during a RAM suspension, or during a random crash. If I suspend to RAM, it doesn't show errors (simply says "starting suspend to ram..." etc. If it's a crash, syslog has some error output (attached below).
See attached what syslog spits out just before the random crash, and when I boot kubuntu back up. Note, hot-plugging an HDMI display during this version of the crash/bug doesn't give me any display/control: randomcrashSyslog[Jan25].txt
Here's a short version from a random crash at a different time (same type) which I believe holds the key errors: randomcrashSHORTSyslog[Jan26].txt
See attached the syslog when the system is manually suspended to RAM:
See attached a syslog when I left the system at the login screen for an hour or so. Screen did go black, and I could not wake it, however the keyboard seemed responsive (caps lock light toggles, etc.). This - to me - seems good evidence that it's either the thunderbolt bus which my display is attached to is not "waking up" right, or the graphics drivers are unable to process the display wake-up process, or both! Logged in successfully with a black screen and used init 6 to reboot: loginscreenblackdisplaySyslog[Jan26].txt
Update: Swapped my thunderbolt display for an HDMI one. Suspend to RAM and the wake-up process works! SO 18.04 doesn't like thunderbolt displays. I'm going to try and reproduce the random crash on the HDMI-display. Just have to leave it on for a while and wait.
Update update: Continues to crash randomly with HDMI display. Here's the syslog: randomcrashHDMIsyslog[Jan26].txt
Same symptoms, different syslog output. The first 'random crash' syslog is most likely the most telling/is of most importance. Nothing seems harmful in syslog just before suspending to RAM.
The system stops logging due to the suspension, but seems to keep logging once the screen goes black on a random crash, so that probably means it's some kind of driver failure instead of a kernel panic or something? I think the suspension not waking and the random crash are two separate, but very similar issues. I have a feeling there's just little support for my RAM/GPU/CPU/Motherboard. I've also attached my system profile. If you need more info, let me know.
Anyways, hopefully someone will have some insight into this, or will be able to point me in the direction of where to make this known to some developers!
Brief Profile
Mac Pro Late 2013 - https://support.apple.com/kb/SP697?locale=en_US
Weird, I know, but I've also got macOS and Windows installed for a triple-boot setup. Super fun, and testing its capabilities!
Processor - Intel Xeon E5 with 25MB L3 cache and Turbo Boost up to 3.9GHz - 3.0GHz 8-Core
Memory - DDR3 ECC memory 3.0GHz 8-Core 64GB (four 16GB)
Graphics - Dual AMD FirePro D300 graphics processors with 2GB of GDDR5 VRAM each - 3.7GHz Quad-Core
System Profile according to command "inxi -Fxz" and "System Profiler and Benchmark" on KDE Discover:
profile[Jan25].txt
Syslog events during random bug/crash with thunderbolt display. Glaring errors here. I think I even cut off it's logging after a couple of minutes of it being black by hard resetting. Next time I'll let it run longer:
randomcrashSyslog[Jan25].txt
The same type of crash, at a different time. Shortened syslog which I believe holds the errors which could help solve the issue:
randomcrashSHORTSyslog[Jan26].txt
The same type of crash, but with only an HDMI display connected.
randomcrashHDMIsyslog[Jan26].txt
Syslog events when screen goes black at login window after a while with thunderbolt display connected. Keyboard was responsive but the display didn't wake. Logged in with black screen and issued init 6 to reboot.
loginscreenblackdisplaySyslog[Jan26].txt
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