Re: Memory corruption in powerpc guests with virtio_balloon (was Re: [PATCH v3] virtio_balloon: fix deadlock on OOM)

"Michael S. Tsirkin" [off-list ref] writes:

On Fri, Dec 01, 2017 at 11:31:08PM +1100, Michael Ellerman wrote:

quoted

"Michael S. Tsirkin" [off-list ref] writes:

quoted

fill_balloon doing memory allocations under balloon_lock
can cause a deadlock when leak_balloon is called from
virtballoon_oom_notify and tries to take same lock.

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quoted

Somehow this commit seems to be killing powerpc guests.

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Thanks for the report!
A fix was just posted:
virtio_balloon: fix increment of vb->num_pfns in fill_balloon()

Would appreciate testing.

Yep that fixes it. Thanks.

Tested-by: Michael Ellerman <mpe@ellerman.id.au>

cheers