Re: port-amd64/55543: PVHVM fails to attach hypervisor bus on Amazon EC2 t2.micro

[Jared McNeill <jmcneill%invisible.ca@localhost>]

The following reply was made to PR port-amd64/55543; it has been noted by GNATS.

From: Jared McNeill <jmcneill%invisible.ca@localhost>
To: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
Cc: gnats-bugs%netbsd.org@localhost, port-amd64-maintainer%netbsd.org@localhost, 
    gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: port-amd64/55543: PVHVM fails to attach hypervisor bus on Amazon
 EC2 t2.micro
Date: Sun, 6 Sep 2020 14:50:32 -0300 (ADT)

 On Sun, 6 Sep 2020, Manuel Bouyer wrote:
 
 > On Sun, Sep 06, 2020 at 02:31:23PM +0200, Manuel Bouyer wrote:
 >> Unfortunably with Xen 4.2.5 it boots. Also, xencons is present.
 >>
 >> Can you enter ddb when it's hung ? if so, can you see where the Xen-related
 >> threads are waiting ?
 >
 > Also, enabling the DPRINTK macro in xenbus/xenbus_probe.c could give
 > hints.
 
 I don't see any output from DPRINTK so I guess we are hung before the 
 thread had an opportunity to run. Unfortunately console input is not 
 supported on EC2 so I can't get to ddb.