[pve-devel] Unit 240.scope already exists.

[Stefan Priebe - Profihost AG]

Am 12.09.2018 um 10:19 schrieb Wolfgang Bumiller:
> On Wed, Sep 12, 2018 at 08:29:02AM +0200, Stefan Priebe - Profihost AG wrote:
>> Hello,
>>
>> i don't know whether this is a known bug but since Proxmox V5 i have
>> seen the following error message several times while trying to start a
>> vm after shutdown:
>> ERROR: start failed:
>> org.freedesktop.systemd1.UnitExists: Unit 240.scope already exists
> 
> We've seen this happen. I'm inclined to consider it a systemd issue
> since we perform a `systemctl stop` on the scope at startup. And
> particularly when the qemu process is already gone it's weird that this
> command returns before the scope is actually gone.
> To me this looks like a timing issue. (And the systemctl command line
> tool also doesn't give us a lot of choices regarding synchronization,
> eg. I wish there was a 'systemctl wait' to wait for a job to finish...).
> 
> Since the explicit unconditional `systemctl stop` doesn't seem to be
> doing the trick we may just have to talk to systemd more via dbus at
> startup.
> We already use dbus to create the scope in the first place, but waiting
> for jobs we don't know exist anymore after trying to make sure they
> actually don't hasn't felt too appealing to us...
> 
>>
>> I had a similiar problem under our ubuntu 18.04 workstations where the
>> only solution was to tun:
>>
>> rm -fv /run/systemd/transient/$name.scope
>> systemctl daemon-reload
> 
> When it's not a timing issue, a `systemctl stop $name.scope` should work
> as well. If it doesn't, I'd very much like to know why (and why
> systemctl doesn't tell you about it...).

yes that's most probably correct and yes i also think this is a systemd
issue.


What about implementing a retry / wait 1s for max 5s if the scope is
stopped but still exists?

Greets,
Stefan