On Fri, 21 Jul 2023, Andrei Cherechesu (OSS) wrote: > > I am really confused. I would try with regular Linux instead of Linux RT > > and also would try to replace all the barriers in > > drivers/tty/hvc/hvc_xen.c with their virt_* version to see if we can > > narrow down the problem a bit. > > > > Unfortunately, we do not normally run regular Linux and we do not have a > stable regular Linux version with our HW support ported on it. We've been > running > Linux RT since 4.14 (or even earlier I think), but this issue has started to > happen > since we upgraded to Xen 4.17 (from 4.14), with both Linux RT 5.15 and 5.10.
I saw that George tried both suggestions without making progress. This is a very difficult bug. If Xen 4.14 works and the issue starts with Xen 4.17, then I would try to bisect it (try Xen 4.15, 4.16, etc. until you narrow down the commit).
