Re: [PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu

[Paolo Bonzini]

On 13/05/20 13:26, Daniel P. Berrangé wrote:
> Are you referring to the in-kernel NFS client hangs here ?  AFAIK, it is
> impossible to do anything to get out of those hangs from userspace, because
> the thread is stuck in an uninterruptable sleep in kernel space.
> 
> If using the in-QEMU NFS client, then there is a network connection that
> can be yanked just like the NBD client.

But it's a bad idea to yank it (and also the NBD client) because you're
not sure which wites have made it to the server (and to the medium) and
which haven't.

Effectively, the in-QEMU NFS client and NBD client are always operating
in "soft" mode, but we should always treat that as a bug (which cannot
be fixed) and not a feature for read-write images.

Paolo