Hi Waldemar, can you try launching QEMU with -monitor telnet::4442,server,nowait (or any other port), and check if the monitor is available when the suspected deadlock occurs? If connecting works, try info block and blockstats, this may give some further clues, whether the hang happens in host or in guest. Of course everything is possible, but I think it is quite unlikely that it hangs in the host virtio code: it's used a lot in emulation of systems where we have much more users (x86-64 and ppc). Artyom On Mon, Mar 31, 2014 at 9:27 AM, wbx