On Fri, Oct 18, 2019 at 12:55:02AM -0700, Sacha wrote:
> Dear all,
> 
>  first of all sorry if this bug report is not complete, the issue is on our
> production firewalls and each test cut all our AS network, we have to be in
> the datacenter to go further.

This is not good.

>  We have 2 firewalls on master/slave Carp failover, with BGPD and OSPF.
>  After upgrading on 6.6, we have an issue when we reboot one of our two
> firewalls, it make the other crash the BGPD daemon (our AS is no more
> announced).
>  This occurs even on master and slave firewall, when we reboot one the other
> looses it's bgp.
>  What we know so far is if we stop ospf & ospf6 daemons before the reboot,
> there is no more issue.
>  I'm going to the datacenter this afternoon, I will try to reproduce with
> more logs.
>  All ideas for debugging are welcome.
> 

Check /var/log/daemon what did bgpd log before going down?
I would be interested to see the bgpd related syslog output.

You can increase logging with bgpctl log verbose or just run bgpd
in debug more (bgpd -dvv).

If one of the process crashes (normally by a SIGSEGV or similar signal)
then set the sysctl kern.nosuidcoredump=3 and create a directory called
/var/crash/bgpd. Also make sure your limit for the coredumpsize is high
enough. This should allow you to get a coredump of the crashing process.
Once you have a core it should be possible to get a backtrace.

-- 
:wq Claudio

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