On 18/12/2023 3:34 pm, Joe Tretter wrote: > Hello, > > I discussed the below problem with the QubesOS team on Github > (https://github.com/QubesOS/qubes-issues/issues/4493) and they suggest > that this seems to be a problem with Xen, and suggested that I post it > to this e-mail address. > > I have problems restoring backups in QubesOS release 4.1.2 on one of > my machines. > Other users reported the issue too, but no QubesOS developer seemed to > be able to reproduce it, therefore nothing happened for a while and > the assumption has been that it's some sort of hardware problem. > > I analyzed the problem down to the "scrypt" tool > (https://www.tarsnap.com/scrypt.html) falsely complaining that the > password would be wrong. > I proceeded and re-compiled the "scrypt" tool in it's latest version > and found that the self-tests show intermittent erratic behavior. > > This issue only happens with QubesOS/Xen Kernel, if I boot into a > kernel without Xen, the problem can't be observed. > The problem can only be observed on one of my machines which is a Dell > Inspiron 5675 with an AMD Ryzen 7 1700 Eight-Core Processor. > > I hope you can help with this issue.
So the issue is specific to your AMD Zen1 system, and only when Xen is in the mix. Can you try booting Xen with spec-ctrl=eager-fpu and see if that changes the behaviour ? ~Andrew
