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 <stefa...@redhat.com> > > 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 <m...@redhat.com> > > 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
