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Hardware - Support => Start up and Shutdown => Topic started by: MS on October 15, 2018, 01:16:47 PM

Title: Error loop on reboot
Post by: MS on October 15, 2018, 01:16:47 PM

Oftentimes when issued manually to reboot, the system would close up all the processes but somehow fail to proceed. When given input, the terminal would show up, with the last line telling the system is initiating reboot, but further input returns the original black screen, which we had escaped. Further input rolls back to the same terminal sequence, appearing to load again each time anew.

Title: Re: Error loop on reboot
Post by: Feainnewedd on October 21, 2018, 02:11:34 AM

Same problem. I think I'm rolling back to 3.8.

Title: Re: Error loop on reboot
Post by: Jerry on October 21, 2018, 02:14:15 AM

We'd need to know your hardware profile, boot up logs etc. We can't do anything without this info sorry.

Moved to Start up and Shutdown section.

Title: Re: Error loop on reboot
Post by: MS on October 23, 2018, 03:59:59 PM

Sure deal, tell what you want to know and how to get the data.

Title: Re: Error loop on reboot
Post by: kpanic on October 23, 2018, 04:48:31 PM

Quote from: MS on October 15, 2018, 01:16:47 PM

Oftentimes when issued manually to reboot, the system would close up all the processes but somehow fail to proceed. When given input, the terminal would show up, with the last line telling the system is initiating reboot, but further input returns the original black screen, which we had escaped. Further input rolls back to the same terminal sequence, appearing to load again each time anew.

If you are trying to shutdown, reboot or startup and
still find out just a black screen, try this:

Press CTRL+ALT+F2
You should get a login prompt. Login and type 'sudo su'
Then command:

Code: [Select]

mount | grep /dev/sd
If it gives some drives still mounted, then
try to unmount them and if it fails, remount them read-only
by commanding something like: 'sync; mount -o remount,ro /dev/sdX'
where X is the partition you are trying to unmount.

So, first try to unmount the unmounted partitions, if some or all
of them fail, then try to remount them read-only, like said above.
Let's say it succeeded, then just command:

Code: [Select]

sync; init 0and reboot...

But, if it did not succeed, then try:

Code: [Select]

sync; mount -o remount,rw / ;
There are certain race-type bugs in Ubuntu systemd services which cause
these kinds of problems. But, let's fix them, right? :)

Title: Re: Error loop on reboot
Post by: kpanic on October 23, 2018, 04:57:31 PM

Actually bug in the order, in which system tries to close processes and unmount directories.
When done in inconsistent order, the system shutdown process may hung up, waiting for
another process to free the resource it is trying to access

Title: Re: Error loop on reboot
Post by: MS on October 23, 2018, 11:38:44 PM

Quote from: kpanic on October 23, 2018, 04:57:31 PM

Actually bug in the order, in which system tries to close processes and unmount directories.
When done in inconsistent order, the system shutdown process may hung up, waiting for
another process to free the resource it is trying to access

So you want that information still or not?