[j-nsp] Configuration database stuck with mgd crashing

[Luis Balbinot]

As root you can “mgd -I” to fix that. We also had the same issue and it’s
been fixed on 16.1R7. We never opened a JTAC case for that because we knew
the answer would be software upgrade since 16.1R7 was already out. The
cause was Netconf and it randomly occurred.

Strangely this was caused by the service release version. Earlier 16.1R6
images were fine.

On Fri, 31 Aug 2018 at 08:49 Tore Anderson <tore at fud.no> wrote:

> One of my routers (a MX240 running 16.1R6-S2.3) have gotten stuck in a
> state where it believes the configuration database has been modified,
> and if I try to configure it anyway, mgd crashes and is respawned:
>
> tore at router> configure exclusive
> error: configuration database modified
>
> tore at router> configure private
> error: shared configuration database modified
>
> tore at router> configure
> Entering configuration mode
>
> Message from syslogd at router at Aug 31 13:38:57  ...
> router mgd[20554]: ../../../../../../src/ui/lib/access/model.c:238: insist
> 'model > 0 && model <= MODEL_MAX' failed
>
> error: session failure: unexpected termination
> error: remote side unexpectedly closed connection
> Connection to router closed.
>
> At this point PID 20554 goes away from the process list. However if I
> log back in I can see a «ghost» reference to it:
>
> router> configure exclusive
> Users currently editing the configuration:
>   tore terminal pts/0 (pid 20554) on since 2018-08-31 13:38:57 CEST, idle
> 00:01:25
> error: configuration database modified
>
> "request system logout user tore all" will get rid of that reference,
> but the fundamental defective state of the configuration database
> remains.
>
> Any suggestions on how to correct this problem without requiring
> any downtime? I have of course tried "restart management", but
> that didn't help. NETCONF is impacted too.
>
> Tore
>
>
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