Re: Fedora kernel crashing in virtio when running on qemu

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On Tue, Mar 21, 2017 at 3:59 PM, Adam Williamson
<adamwill@xxxxxxxxxxxxxxxxx> wrote:
> On Tue, 2017-03-21 at 20:48 +0000, Richard W.M. Jones wrote:
>> On Tue, Mar 21, 2017 at 12:58:06PM -0700, Adam Williamson wrote:
>> > On Tue, 2017-03-21 at 19:40 +0000, Richard W.M. Jones wrote:
>> > > https://bugzilla.redhat.com/show_bug.cgi?id=1430297
>> > >
>> > > This has been going on for a few weeks with no attention.  It prevents
>> > > anyone from running libguestfs on Fedora 26.
>> > >
>> > > It's (IMHO) pretty serious for anyone using virtualization: "kernel
>> > > doesn't boot on qemu" should be a blocker for a Fedora release.
>> > >
>> > > Can anyone see what's going on?
>> >
>> > The earlier case looks like
>> > https://bugzilla.redhat.com/show_bug.cgi?id=1430043 , which was fixed
>> > in rc2. I'm not sure about the latter case, though Thorsten Leemhuis
>> > reported intermittent crash / hang during boot with rc2 as:
>> >
>> > https://bugzilla.kernel.org/show_bug.cgi?id=194911
>> >
>> > Since rc2 I've seen occasional failures which are probably the same as
>> > the ones Thorsten was seeing, but usually it works OK. I run 26-on-26
>> > VMs via virt-manager quite a lot, they certainly don't fail every time.
>>
>> Does libguestfs-test-tool work for you in F26?
>
> Hum, interesting results:
>
> If I run it as a regular user, it works.
> If I run it as root as usual, it gives me a libvirt error, some
> permission issue.
> If I run it as root with LIBGUESTFS_BACKEND=direct , it hits the same
> kernel trace you hit.

Off the top of my head, I'd guess that the failing cases are using
vhost on the host.  I've never used vhost in my life, so I have no
clue about it.

--Andy
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