On 2020-05-08 23:30:45 [+0200], Stephen Berman wrote: > > Can you log the output on the serial console? > > How do I do that?
The spec for your mainboard says "serial port header". You would need to connect a cable there to another computer and log its output. The alternative would be to delay the output on the console and use a camera. > > If the commit you cited is really the problem then it would mean that a > > worker isn't scheduled for some reason. Could you please enable > > CONFIG_WQ_WATCHDOG to see if workqueue core code notices that a worker > > isn't making progress? > > How will I know if that happens, is there a specific message in the tty? On the tty console where you see the "timing out command, waited" message, there should be something starting with |BUG: workqueue lockup - pool following with the pool information that got stuck. That code checks the workqueues every 30secs by default. So if you waited >= 60secs then system is not detecting a stall. As far as I can tell, there is nothing special on your system. The CD and disk drives are served by the AHCI controller. There is no special SCSI/SATA/SAS controller. Right now I have no idea how the workqueues fit in the picture. Could you please check if the stall-dector says something? Is it possible to show me output when the timeout message comes? My guess is that the system is going down and before unounting/remount RO the filesystem it flushes its last data. But this is done before issuing the "halt-syscall". > Thanks for your reply. > > Steve Berman Sebastian
