VBoxDD.so segfaults on resuming Win11 guest that was previously saved

[sercallegar]

Recently it has become impossible to save and resume guests.

Guests appear to save fine, but cannot be resumed. Trying to resume the machine results in

segfault at 7fe511b0d2b6 ip 00007fe3a4f2f67f sp 00007fe4121fec50 error 6 in VBoxDD.so[7fe3a4e27000+1e5000] likely on CPU 7 (core 3, socket 0) [ 718.476347] Code: 5f 08 48 8b 43 10 4c 8b 6b 18 48 89 df 48 8b 73 28 ff 90 90 08 00 00 85 c0 0f 88 bc 00 00 00 41 0f b6 44 24 61 41 8d 44 06 ff <41> c6 84 07 38 01 00 00 00 48 8d 0c 40 48 89 c2 48 c1 e1 02 49 8d

[sercallegar]

Experiencing the same with Virtuabox 7.1.6 on a linux host both w/ kernel 6.6.x and 6.12.19. Hardware is an old haswell laptop.

[sercallegar]

Now, what is weird is that the issue seems to come and go. It seems to be hardware dependent (I do not have any issue from a very similar windows guest on a different host with the same OS as the one on which I have the problem but way more modern hardware). Furthermore, I am getting the impression (might be wrong) that the issue has started to appear again after an upgrade of the disk drive on which the virtual machine is stored. The upgrade was from a rotating hd to an ssd, with a byte-by-byte copy of the partitions. So I wonder if this might be a timing/race related issue.

[sercallegar]

A symptom that I am noticing is that when you resume from a saved state, vbox typically tries to load the screen image (that initially is shown as grayed until the machine has fully resumed). When the issue occurs, vbox crashes *before* this background image is loaded.

[sercallegar]

I think that I have understood a bit more of it. The issue occurs when you have a virtio disk attachment (even if there are no disks under it).