I didn't try the SysRq commands, as I didn't know about them. My impression was, that everything just stopped working, nothing except the hard reset seemed to cause any reaction, hardware or otherwise.
The syslog didn't show anything unusual either. I compared several versions of the syslog after different freezes and didn't find any similarities in the last 5 minutes before it stopped working.
A co-worker using Ubuntu 18.04. and kernel 4.15.0-151 also reported problems with freezes, that didn't occur in 4.15.0-147, but he didnt have the RO filesystem problem.
I will check whether the SysRq commands work the next freeze.
I didn't try the SysRq commands, as I didn't know about them. My impression was, that everything just stopped working, nothing except the hard reset seemed to cause any reaction, hardware or otherwise.
The syslog didn't show anything unusual either. I compared several versions of the syslog after different freezes and didn't find any similarities in the last 5 minutes before it stopped working.
A co-worker using Ubuntu 18.04. and kernel 4.15.0-151 also reported problems with freezes, that didn't occur in 4.15.0-147, but he didnt have the RO filesystem problem.
I will check whether the SysRq commands work the next freeze.