Re: kern/57560: xennetback_xenbus.c rev 1.109 broke guests, causes DOM0 reboot

[Brad Spencer <brad%anduin.eldar.org@localhost>]

The following reply was made to PR port-xen/57560; it has been noted by GNATS.

From: Brad Spencer <brad%anduin.eldar.org@localhost>
To: Martin Husemann <martin%duskware.de@localhost>
Cc: riastradh%NetBSD.org@localhost, gnats-bugs%NetBSD.org@localhost, martin%NetBSD.org@localhost
Subject: Re: kern/57560: xennetback_xenbus.c rev 1.109 broke guests, causes
 DOM0 reboot
Date: Sat, 05 Aug 2023 09:59:18 -0400

 Martin Husemann <martin%duskware.de@localhost> writes:
 
 > I verified I could reproduce the issue in my setup with a -current kernel
 > from yesterday without the sys/arch/xen/xen/xennetback_xenbus.c backouts.
 > As described here, as soon as the domU starts dhcpcd the dom0 locked
 > up hard - no breaking into ddb possible, no console output.
 
 For me, the system actually will reboot after a short bit after it hangs
 up, but the lockup is very tight in the mean time.
 
 > Then I updated to -current as-is right now (with the xennetback_xenbus.c
 > changes backed out) and everything worked fine.
 >
 > This was only to verify I'm on the same base as Brad.
 
 Thank you very much for the verify in this matter.
 
 > Then I applied the xvifmembars.diff change, booted the new dom0 kernel
 > and verified domUs can use the network just fine.
 
 That is also good to hear.  It will probably be a bit before I can test
 for myself, but that is very encouraging.
 
 > So: with the "diff" variant everything seems to be fine.
 >
 > Martin
 
 
 
 -- 
 Brad Spencer - brad%anduin.eldar.org@localhost - KC8VKS - http://anduin.eldar.org