[Bug 110951] GPU hang while using kvmgt

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110951

--- Comment #20 from velde666 at gmail.com ---
Hi there,

this morning at 11:05 the Windows vm crashed again with loads of following
messages:

Nov 17 11:05:04 floor13 kernel: gvt: vgpu 1: fail: shadow page 00000000676a8bff
guest entry 0xfb286b90fb286b9 type 9
Nov 17 11:05:04 floor13 kernel: gvt: vgpu 1: fail: spt 00000000bd066075 guest
entry 0xfb286b90fb286b9 type 9
Nov 17 11:05:04 floor13 kernel: gvt: vgpu 1: fail: shadow page 00000000bd066075
guest entry 0xfb286b90fb286b9 type 9.
Nov 17 11:05:04 floor13 kernel: gvt: guest page write error, gpa 194e47000

ending with

Nov 17 11:05:05 floor13 kernel: gvt: vgpu 1: fail to flush post shadow
Nov 17 11:05:05 floor13 kernel: gvt: vgpu 1: fail to dispatch workload, skip



After that I got several kernel traces starting with

Nov 17 11:07:46 floor13 kernel: INFO: task gvt_service_thr:301 blocked for more
than 122 seconds.

repeating every 2 minutes and ending at 11:15:58.



Unfortunately no dump was written in /sys/class/drm/card0/error

[root at floor13 ~]# cat /sys/class/drm/card0/error
No error state collected

I had to destroy the vm leaving the corresponding qemu-kvm process zombified.
As long as I do not restart the host I am not able to restart the Windows vm as
the zombie process blocks all connected devices

Any help or suggestions much appreciated :\

Best regards
Alex

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