[Bug 220057] Kernel regression. Linux VMs crashing (I did not test Windows guest VMs)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220057

--- Comment #12 from Adolfo (adolfotregosa@gmail.com) ---
I tested both NVIDIA driver versions 570.144 and the beta 575.51.02.
Assuming my machine is fine — since reverting that commit resolved the issue —
I believe the reason there are so few reports is that Proxmox still ships with
kernel 6.8. We had an opt-in for 6.11.11, and it also works fine.
Recently, 6.14 was offered as an opt-in, and that's what led me down the rabbit
hole. I started compiling vanilla kernels: 6.12.25 LTS crashed, and 6.12-rc1
crashed as well. This indicated that the problem was introduced between 6.11.11
and 6.12-rc1.
I performed a bisect, which led me to the problematic commit. After reverting
that commit, I can now run 6.14.4 without issues, just like 6.11.11.

Regarding Proxmox VM guest configuration. Proxmox does not use libvirt but I
leave the VM configuration file bellow.

GNU nano 7.2 /etc/pve/qemu-server/200.conf                                      
-------------
affinity: 0-7
agent: 0
args: -machine hpet=off
balloon: 0
bios: ovmf
boot: order=hostpci2
cores: 8
cpu: host,flags=+pdpe1gb
cpuunits: 200
efidisk0: local-lvm:vm-200-disk-0,efitype=4m,pre-enrolled-keys=1,size=4M
hookscript: local:snippets/200.pl
hostpci0: 0000:01:00,pcie=1,rombar=0
hostpci1: 0000:00:14.0,rombar=0
hostpci2: 0000:06:00.0,rombar=0
hostpci4: 0000:03:0a.2,rombar=0
hotplug: usb
hugepages: 1024
kvm: 1
machine: q35
memory: 32768
meta: creation-qemu=9.0.2,ctime=1737473987
name: cachyOS
numa: 1
onboot: 0
ostype: l26
scsihw: virtio-scsi-single
smbios1: uuid=f75921fc-d45e-4463-8590-8a4aab19e6e8
sockets: 1
startup: order=3,up=300,down=20
tablet: 0
vga: none
vmgenid: 2cd9b643-58a2-4ac4-a01c-f6a131e65c6d

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