Re: [Qemu-devel] make check: crash in vhost-user chardev cleanup

[Marc-André Lureau]

Hi

On Fri, Feb 24, 2017 at 11:54 PM Dr. David Alan Gilbert <address@hidden>
wrote:

> Hi,
>   I'm seeing a hang+crash doing a make check that
> looks like it's coming from vhost-user's chardev cleanup,
> so I'm suspecting your e0b283e7c.
> The synptom is that the make check hangs in the qtest
> part, and a dmesg shows that a qemu crashed.
>

See that thread:
https://lists.nongnu.org/archive/html/qemu-devel/2017-02/msg06015.html


> I got a backtrace that shows:
>
> (gdb) where
> #0  0x0000560d3344f03e in qemu_chr_fe_read_all (address@hidden,
> address@hidden "\v", address@hidden) at
> /home/dgilbert/git/qemu/chardev/char.c:209
> #1  0x0000560d33199d64 in vhost_user_read (address@hidden,
> dev=<optimized out>)
>     at /home/dgilbert/git/qemu/hw/virtio/vhost-user.c:125
> #2  0x0000560d3319a11f in vhost_user_get_vring_base (dev=0x560d35a614a0,
> ring=0x7ffea7a2f670)
>     at /home/dgilbert/git/qemu/hw/virtio/vhost-user.c:417
> #3  0x0000560d33196abb in vhost_virtqueue_stop (address@hidden,
> address@hidden, vq=0x560d35a61678, idx=1) at
> /home/dgilbert/git/qemu/hw/virtio/vhost.c:1070
> #4  0x0000560d33198cd4 in vhost_dev_stop (address@hidden,
> address@hidden)
>     at /home/dgilbert/git/qemu/hw/virtio/vhost.c:1533
> #5  0x0000560d3317bfd8 in vhost_net_stop_one (net=0x560d35a614a0,
> dev=0x560d3729cc00)
>     at /home/dgilbert/git/qemu/hw/net/vhost_net.c:288
> #6  0x0000560d3317c4aa in vhost_net_stop (address@hidden,
> ncs=<optimized out>, address@hidden) at
> /home/dgilbert/git/qemu/hw/net/vhost_net.c:367
> #7  0x0000560d33179201 in virtio_net_vhost_status (status=<optimized out>,
> n=0x560d3729cc00)
>     at /home/dgilbert/git/qemu/hw/net/virtio-net.c:176
> #8  0x0000560d33179201 in virtio_net_set_status (vdev=0x560d3729cc00,
> status=7 '\a')
>     at /home/dgilbert/git/qemu/hw/net/virtio-net.c:250
> #9  0x0000560d3339ce99 in qemu_del_net_client (nc=0x560d35a61250) at
> /home/dgilbert/git/qemu/net/net.c:390
> #10 0x0000560d3339e30d in net_cleanup () at
> /home/dgilbert/git/qemu/net/net.c:1454
> #11 0x0000560d330ee940 in main (argc=<optimized out>, argv=<optimized
> out>, envp=<optimized out>)
>     at /home/dgilbert/git/qemu/vl.c:4637
> (gdb)
>
> #0  qemu_chr_fe_read_all (address@hidden, address@hidden
> "\v", address@hidden)
>     at /home/dgilbert/git/qemu/chardev/char.c:209
> 209         Chardev *s = be->chr;
>
> Dave
>
> --
> Dr. David Alan Gilbert / address@hidden / Manchester, UK
>
> --
Marc-André Lureau