On Fri, Nov 04, 2022 at 03:27:13PM -0600, Alex Williamson wrote:
> On Tue, 25 Oct 2022 15:12:09 -0300
> Jason Gunthorpe <jgg@xxxxxxxxxx> wrote:
>
> > [
> > At this point everything is done and I will start putting this work into a
> > git tree and into linux-next with the intention of sending it during the
> > next merge window.
> >
> > I intend to focus the next several weeks on more intensive QA to look at
> > error flows and other things. Hopefully including syzkaller if I'm lucky
> > ]
>
> In case this one hasn't been reported yet (with IOMMUFD_VFIO_CONTAINER):
>
> ======================================================
> WARNING: possible circular locking dependency detected
> 6.1.0-rc3+ #133 Tainted: G E
> ------------------------------------------------------
> qemu-system-x86/1731 is trying to acquire lock:
> ffff90d3f5fe3e08 (&iopt->iova_rwsem){++++}-{3:3}, at: iopt_map_pages.part.0+0x85/0xe0 [iommufd]
>
> but task is already holding lock:
> ffff90d3f5fe3d18 (&iopt->domains_rwsem){.+.+}-{3:3}, at: iopt_map_pages.part.0+0x18/0xe0 [iommufd]
>
> which lock already depends on the new lock.
I think this is:
https://lore.kernel.org/all/Y1qR6Zxdmuk+ME5z@xxxxxxxxxx/
Thanks,
Jason
