Bug#821225: disk/memory corruption inside VM, VM crashes on KVM on amd64
severity 821225 normal
retitle 821225 transparent huge pages cause disk/memory corruption inside VM, VM crashes on KVM on AMD CPUs
thanks
On Sat, Apr 16, 2016 at 09:45:52PM +0200, Marc Haber wrote:
> I have a desktop PC running with an AMD Phenom II X6 1090T processor,
> cpu family 16, model 10. This is as far as I know not subject to the
> recent AMD microcode issues, but the amd64-microcode package is
> installed nevertheless.
>
> The host is running a few KVM VMs, also Debian. As soon as the host
> runs a kernel of 4.5.0 or later, VMs fail through disk-intensive
> operations, such as running aide --update multiple times in a row.
> This is independent of the kernel version runing in the guest.
>
> Failures can manifest themselves in processes in the guest
> segfaulting, the guest detecting a journal abort of its ext4
> filesystems and remounting the filesystem r/o or the guest stopping
> dead in its tracks. Neither the logs of the guest nor of the host show
> anything more conclusive. The system can run for up to six hours
> before the VM begins to show the errativ behavior, but usually the
> issue surfaces in the first ten minutes of the system running.
A workaround is disabling transparent huge pages at runtime. With this
setting, all VMs are fine again.
Greetings
Marc
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Marc Haber | "I don't trust Computers. They | Mailadresse im Header
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