Mysterious graphic that makes ubuntu host unusable

[Joel Rees]

I've seen this, too. No solution, just figured it was more evidence of too
many cooks spoiling the stew. For some reason I suspect systemd, but I
suppose I'm just showing my prejudices there.

2021年4月24日(土) 2:33 reader <reader at newsguy.com>:

> Setup:
>   Hardware: HP xw8600 2x xeon 56?? - 32 GB ram
> Running: ubuntu 20.10 with zfs on root
>
> Trying to describe a phenomena I see every so often.  I have not been
> able to isolate the culprit.  It just is not apparent what things have
> to happen to cause this problem.
>
> Some times when I have left the machine running and switched over to
> a windows host thru a KVM switch connecting two servers
>
> When I switch back to ubuntu zfs I sometimes find a full screen graphic
> displayed.  No amount of twiggling the keyboard will get thru and show
> the hosts lxde desktop. Not spc, or backspc, or esc, or
> control-alt-del.  Or any other keyboard press or combo I could imagine
> will get thru the the desktop.  There is no prompt asking for creds.
>
> I can logon thru ssh from the windows host and do everything in text
> mode that one would normally do.
>
> I've searched thru ps wwaux output for anything to do with locking or
> screen or the like.  I killed a few pids but so far have not hit the
> right one.
>
> There are 550+ pids showing...  So I really have no idea what I'm looking
> for.
>
> Some kind of screen locking seems most likely but I have definitely
> turned off the screensaver in desktop selections, so it does not even
> start on bootup/login
>
> I figured I could find a pid for X and kill that but I do not see such
> a thing... maybe overlooking it.  Probably overkill but I'm really at
> a loss as to what to do to trace down the program doing this.
>
> I've been getting restarted by first going in thru ssh and shutting
> down 2 VBox vms I often have running thru VBoxManage at cli.  Once
> that is done in a way that no harm is done I then reboot that server.
> Quite a tedious pita what you are working hard on something
>
> I know there are things that are designed to lock out all but the
> current user.  And one is required to reinsert there login creds to
> get to work.
>
> `ps wwaux|grep lock'  turns up about 10-12 pids of the format:
>
>   `... [kworker/0:0H-kblockd]' (sq brackets not added).  Which seem
>   unrelated.
>
> This grahpic that takes over the screen does not offer any kind of
> UID passwd type thing... it offers nothing and responds to nothing
> I've found so far.
>
> The problem does not happen every time I leave the host running and do
> something else... just occasionally . . .
>
> Can anyone guess what program would put up a graphic that effectively
> locks the OS from use thru any normal means
>
> Any suggestions would be greatly appreciated.
>
>
>
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