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

[Martin Husemann <martin%duskware.de@localhost>]

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

From: Martin Husemann <martin%duskware.de@localhost>
To: Taylor R Campbell <riastradh%NetBSD.org@localhost>
Cc: Brad Spencer <brad%anduin.eldar.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, 5 Aug 2023 15:26:30 +0200

 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.
 
 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.
 
 Then I applied the xvifmembars.diff change, booted the new dom0 kernel
 and verified domUs can use the network just fine.
 
 So: with the "diff" variant everything seems to be fine.
 
 Martin