On Wed, Sep 17, 2014 at 2:44 PM, Alexey Kardashevskiy <a...@ozlabs.ru> wrote: > On 09/17/2014 07:25 PM, Paolo Bonzini wrote: > btw any better idea of a hack to try? Testers are pushing me - they want to > upgrade the broken setup and I am blocking them :) Thanks!
Paolo's qemu_co_mutex_lock(&s->lock) idea in qcow2_invalidate_cache() is good. Have you tried that patch? I haven't checked the qcow2 code whether that works properly across bdrv_close() (is the lock freed?) but in principle that's how you protect against concurrent I/O. Stefan
