Re: [PATCH v2 2/2] vhost-user: add a request-reply lock

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Aug 29, 2024 at 11:09:44AM +0530, Prasad Pandit wrote:
> On Wed, 28 Aug 2024 at 16:45, Michael S. Tsirkin <mst@redhat.com> wrote:
> > >  - Place QEMU_LOCK_GUARD near the vhost_user_write() calls, holding
> > >    the lock for longer fails some tests during rpmbuild(8).
> >
> > what do you mean fails rpmbuild? that qemu with this patch can not be compiled?
> 
> * In V1 of this patch, QEMU_LOCK_GUARD was placed near beginning of
> the function. But that caused some unit tests to fail reporting
> TIMEOUT errors. In this V2, QEMU_LOCK_GUARD is placed near
> vhost_user_write() calls, to reduce the time that lock is held.
> 
> * Both (V1 & V2) compile well, but fail at '%check' stage while
> running unit tests (on some machines), ie. rpm package is not built.
> rpmbuild(8) on F40 machine failed, but koji scratch build with the
> same SRPM worked fine. Those scratch builds are shared above. RHEL-9
> SRPM built well on RHEL-9 host, but failed to build on F40 machine
> reporting failure at '%check' stage of rpmbuild(8).
> 
> Thank you.
> ---
>   - Prasad

Weird.  Seems to indicate some kind of deadlock?

-- 
MST