Re: kern/53385 (vnconfig deadlock on fstchg)

["Greg A. Woods" <woods%planix.ca@localhost>]

The following reply was made to PR kern/53385; it has been noted by GNATS.

From: "Greg A. Woods" <woods%planix.ca@localhost>
To: NetBSD GNATS <gnats-bugs%NetBSD.org@localhost>
Cc: 
Subject: Re: kern/53385 (vnconfig deadlock on fstchg)
Date: Fri, 19 Feb 2021 14:07:20 -0800

 > >How-To-Repeat:
 > 	destroy a domU with 2 file-backed disks ?
 
 Definitely that.
 
 I just ran "halt -p" in just such a domU (four LVM disks and two
 file-backed disks) and instantly everything in the dom0 got hung in
 "fstchg", including all login shells.
 
 The dom0 host is running NetBSD/amd64 8.99.32 (kernel from about
 2019/11/28).
 
 (Thankfully other domUs running on the same machine appear to still be
 running and apparently can still access their LVM-backed disks, so I
 think I can shut them down before crashing the dom0 -- BUT the dom0 is
 remote and I don't have easy console access!)
 
 > >Fix:
 > 	workaround: make sure Xen won't call more than one vnconfig -u at
 > 	once. But we need a fix for this.
 
 Seriously!
 
 -- 
 					Greg A. Woods <gwoods%acm.org@localhost>
 
 Kelowna, BC     +1 250 762-7675           RoboHack <woods%robohack.ca@localhost>
 Planix, Inc. <woods%planix.com@localhost>     Avoncote Farms <woods%avoncote.ca@localhost>