A user in the Ubuntu bugtracker reports that Ubuntu 25.04 (w/ Linux 6.14) does not exhibit the problematic behavior any more, so I guess upgrading your Debian 13 guests to trixie's backports kernel (6.16 at the time of posting) also has a chance of fixing this bug for you.
[TTM] Buffer eviction failed
- Thread starter tanolis
- Start date
Thx for this - i checked the source of that kernel-version on and it seems that the "breaking code" is still there.
If I understood Post #22 (https://forum.proxmox.com/threads/ttm-buffer-eviction-failed.152720/post-721493) correctly, every kernel since 6.8.10 has it (still). So it should actually not help here - not sure why it might for the guy from the post you mentioned.
My symptoms are also a little different (Gui-Lock after some hours only) - but I will give that a try as well. I really would prefer having that fixed in an official kernel-package rather than patching and self-compiling etc. ;-)
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