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[Qemu-discuss] Qemu corrupted qcow2 system image

From: Ivan Volosyuk
Subject: [Qemu-discuss] Qemu corrupted qcow2 system image
Date: Thu, 05 Nov 2015 01:09:04 +0000

Yesterday, I did a few tweaks for my system which uses VGA passthrough.
- I moved virtual CPUs to dedicated CPUs (isolcpus=4-7 kernel boot argument)
- I instructed my windows guest to use MSI IRQ

Sound crackles disappeared, but after a few minutes of playing Starcraft I got first ever reboot of windows 8.1 in virtual machine. When I tried to restart the virtual machine I got the message that qcow2 image is corrupted.
qemu-img check crashes with segfault now on the image.

Any way I can make a useful bug report from this?

I assume the qemu code handling writes to the qcow2 image was a bit stressed with the constraint to use different CPUs for virtual CPUs and actual io threads.

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