Re: [Qemu-devel] assert hit on master with q35 machine type

[Doug Goldstein]

On 1/10/17 10:01 AM, Stefan Hajnoczi wrote:
> On Mon, Jan 09, 2017 at 01:08:53PM +0000, Dr. David Alan Gilbert wrote:
>> copying in Stefan since it's his commit.
> 
> I can't reproduce the assertion failure.
> 
> Are you able to provide a backtrace (e.g. launch QEMU under gdb and then
> use the 'bt' command after the assertion failure is raised)?
> 
> Thanks,
> Stefan
> 

#0  __GI_raise (address@hidden) at ../sysdeps/unix/sysv/linux/raise.c:58
#1  0x00007ffff44db3ea in __GI_abort () at abort.c:89
#2  0x00007ffff44d1bb7 in __assert_fail_base (fmt=<optimized out>,
    address@hidden "vq->notification_disabled
> 0",
    address@hidden
"/home/doug/work/qemu/hw/virtio/virtio.c",
    address@hidden,
    address@hidden <__PRETTY_FUNCTION__.43707>
"virtio_queue_set_notification") at assert.c:92
#3  0x00007ffff44d1c62 in __GI___assert_fail (
    address@hidden "vq->notification_disabled
> 0",
    address@hidden
"/home/doug/work/qemu/hw/virtio/virtio.c",
    address@hidden,
    address@hidden <__PRETTY_FUNCTION__.43707>
"virtio_queue_set_notification") at assert.c:101
#4  0x00005555557f25d6 in virtio_queue_set_notification (vq=0x55555666aa90,
    address@hidden) at /home/doug/work/qemu/hw/virtio/virtio.c:215
#5  0x00005555557dc311 in virtio_net_has_buffers (q=<optimized out>,
    q=<optimized out>, bufsize=102)
    at /home/doug/work/qemu/hw/net/virtio-net.c:1008
#6  virtio_net_receive (nc=<optimized out>, buf=0x555557386b88 "", size=102)
    at /home/doug/work/qemu/hw/net/virtio-net.c:1148
#7  0x00005555559cad33 in nc_sendv_compat (flags=<optimized out>, iovcnt=1,
    iov=0x7fffead746d0, nc=0x55555788b340) at net/net.c:705
#8  qemu_deliver_packet_iov (sender=<optimized out>, flags=<optimized out>,
    iov=0x7fffead746d0, iovcnt=1, opaque=0x55555788b340) at net/net.c:732
#9  0x00005555559cd929 in qemu_net_queue_deliver (size=<optimized out>,
    data=<optimized out>, flags=<optimized out>, sender=<optimized out>,
    queue=0x55555788b550) at net/queue.c:164
#10 qemu_net_queue_flush (queue=0x55555788b550) at net/queue.c:261
#11 0x00005555559cab0c in qemu_flush_or_purge_queued_packets (
    nc=0x55555788b340, purge=<optimized out>) at net/net.c:611
#12 0x00005555557f1eff in virtio_queue_notify_vq (vq=0x55555666aa90)
    at /home/doug/work/qemu/hw/virtio/virtio.c:1318
#13 0x00005555557adec8 in memory_region_write_accessor (mr=0x555557756d30,
    addr=0, value=<optimized out>, size=2, shift=<optimized out>,
    mask=<optimized out>, attrs=...) at /home/doug/work/qemu/memory.c:526
#14 0x00005555557ab25d in access_with_adjusted_size (address@hidden,
    address@hidden, address@hidden,
    access_size_min=<optimized out>, access_size_max=<optimized out>,
    access=0x5555557ade50 <memory_region_write_accessor>, mr=0x555557756d30,
    attrs=...) at /home/doug/work/qemu/memory.c:592
#15 0x00005555557af28c in memory_region_dispatch_write (
    address@hidden, addr=0, data=<optimized out>,
    address@hidden, address@hidden)
    at /home/doug/work/qemu/memory.c:1336
#16 0x0000555555764d8a in address_space_write_continue (mr=0x555557756d30,
    l=<optimized out>, addr1=<optimized out>, len=2, buf=0x7ffff7fed028 "",
    attrs=..., addr=34359750656, as=0x5555560aa6a0 <address_space_memory>)
    at /home/doug/work/qemu/exec.c:2635
#17 address_space_write (as=0x5555560aa6a0 <address_space_memory>,
    addr=<optimized out>, attrs=..., buf=<optimized out>, len=<optimized
out>)
    at /home/doug/work/qemu/exec.c:2686
#18 0x000055555576532d in address_space_rw (as=<optimized out>,
    addr=<optimized out>, attrs=..., address@hidden,
    address@hidden "", len=<optimized out>,
    is_write=<optimized out>) at /home/doug/work/qemu/exec.c:2788
#19 0x00005555557aa2a8 in kvm_cpu_exec (address@hidden)
    at /home/doug/work/qemu/kvm-all.c:1968
#20 0x0000555555797d48 in qemu_kvm_cpu_thread_fn (arg=0x5555565bc7f0)
    at /home/doug/work/qemu/cpus.c:998
#21 0x00007ffff48726ca in start_thread (arg=0x7fffead75700)
    at pthread_create.c:333
#22 0x00007ffff45ac0af in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

-- 
Doug Goldstein

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