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Re: [Qemu-devel] qemu virtio_net abort bisect
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] qemu virtio_net abort bisect |
Date: |
Fri, 11 Nov 2016 01:07:52 +0200 |
On Thu, Nov 10, 2016 at 03:02:43PM -0800, John Fastabend wrote:
> Hi Michael,
>
> I'm getting a qemu crash from a load/unload of virtio_net.ko in guest
> kernel with the following,
>
> > ./x86_64-softmmu/qemu-system-x86_64 -hda
> > /var/lib/libvirt/images/Fedora-test0.img \
> -m 4096 -enable-kvm -smp 4 -netdev tap,id=hn0,queues=4,vhost=on \
> -device virtio-net-pci,netdev=hn0,mq=on,vectors=9
>
> in the host I do a simple
>
> # rmmod virtio_net
> # modprobe virtio_net
>
> And bisecting points at this merge which just from the commit message
> looks like it could be the culprit,
>
> > Merge: 4eb28ab 5300063
> > Author: Stefan Hajnoczi <address@hidden>
> > Date: Thu Nov 3 14:41:53 2016 +0000
> >
> > Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging
> >
> > virtio, pc: fixes and features
> >
> > nvdimm hotplug support
> > virtio migration and ioeventfd rework <--- ioeventfd bits?
> > virtio crypto device
> > ipmi fixes
> >
> > Signed-off-by: Michael S. Tsirkin <address@hidden>
>
> Running without the above and everything works no issues. I started to
> debug but admittedly got a bit lost in the notifier hooks maybe someone
> will have a better idea. Here is the error I get,
>
> > kvm_io_ioeventfd_add: error adding ioeventfd: File exists
> > Aborted (core dumped)
>
> I had a gdb backtrace at one point and can post that if its helpful.
>
> Thanks,
> John
Thanks!
Unfortunately it looks like a recent change broke this for a lot of people.
If you have the time, it might be helpful to try both
[PATCH] vhost-scsi: Update 'ioeventfd_started' with host notifiers
and
[PATCH v2] vhost: Update 'ioeventfd_started' with host notifiers
--
MST