* [Qemu-devel] make check: crash in vhost-user chardev cleanup
@ 2017-02-24 19:51 Dr. David Alan Gilbert
2017-02-24 20:08 ` Marc-André Lureau
0 siblings, 1 reply; 3+ messages in thread
From: Dr. David Alan Gilbert @ 2017-02-24 19:51 UTC (permalink / raw)
To: marcandre.lureau, qemu-devel; +Cc: mst, armbru
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.
I got a backtrace that shows:
(gdb) where
#0 0x0000560d3344f03e in qemu_chr_fe_read_all (be=be@entry=0x0, buf=buf@entry=0x7ffea7a2f520 "\v", len=len@entry=12) at /home/dgilbert/git/qemu/chardev/char.c:209
#1 0x0000560d33199d64 in vhost_user_read (msg=msg@entry=0x7ffea7a2f520, 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 (dev=dev@entry=0x560d35a614a0, vdev=vdev@entry=0x560d3729cc00, vq=0x560d35a61678, idx=1) at /home/dgilbert/git/qemu/hw/virtio/vhost.c:1070
#4 0x0000560d33198cd4 in vhost_dev_stop (hdev=hdev@entry=0x560d35a614a0, vdev=vdev@entry=0x560d3729cc00)
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 (dev=dev@entry=0x560d3729cc00, ncs=<optimized out>, total_queues=total_queues@entry=1) 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 (be=be@entry=0x0, buf=buf@entry=0x7ffea7a2f520 "\v", len=len@entry=12)
at /home/dgilbert/git/qemu/chardev/char.c:209
209 Chardev *s = be->chr;
Dave
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [Qemu-devel] make check: crash in vhost-user chardev cleanup
2017-02-24 19:51 [Qemu-devel] make check: crash in vhost-user chardev cleanup Dr. David Alan Gilbert
@ 2017-02-24 20:08 ` Marc-André Lureau
2017-02-24 20:12 ` Dr. David Alan Gilbert
0 siblings, 1 reply; 3+ messages in thread
From: Marc-André Lureau @ 2017-02-24 20:08 UTC (permalink / raw)
To: Dr. David Alan Gilbert, qemu-devel; +Cc: armbru, mst
Hi
On Fri, Feb 24, 2017 at 11:54 PM Dr. David Alan Gilbert <dgilbert@redhat.com>
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 (be=be@entry=0x0,
> buf=buf@entry=0x7ffea7a2f520 "\v", len=len@entry=12) at
> /home/dgilbert/git/qemu/chardev/char.c:209
> #1 0x0000560d33199d64 in vhost_user_read (msg=msg@entry=0x7ffea7a2f520,
> 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 (dev=dev@entry=0x560d35a614a0,
> vdev=vdev@entry=0x560d3729cc00, vq=0x560d35a61678, idx=1) at
> /home/dgilbert/git/qemu/hw/virtio/vhost.c:1070
> #4 0x0000560d33198cd4 in vhost_dev_stop (hdev=hdev@entry=0x560d35a614a0,
> vdev=vdev@entry=0x560d3729cc00)
> 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 (dev=dev@entry=0x560d3729cc00,
> ncs=<optimized out>, total_queues=total_queues@entry=1) 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 (be=be@entry=0x0, buf=buf@entry=0x7ffea7a2f520
> "\v", len=len@entry=12)
> at /home/dgilbert/git/qemu/chardev/char.c:209
> 209 Chardev *s = be->chr;
>
> Dave
>
> --
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
>
> --
Marc-André Lureau
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] make check: crash in vhost-user chardev cleanup
2017-02-24 20:08 ` Marc-André Lureau
@ 2017-02-24 20:12 ` Dr. David Alan Gilbert
0 siblings, 0 replies; 3+ messages in thread
From: Dr. David Alan Gilbert @ 2017-02-24 20:12 UTC (permalink / raw)
To: Marc-André Lureau; +Cc: qemu-devel, armbru, mst
* Marc-André Lureau (marcandre.lureau@gmail.com) wrote:
> Hi
>
> On Fri, Feb 24, 2017 at 11:54 PM Dr. David Alan Gilbert <dgilbert@redhat.com>
> 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
Ah OK, as long as it's known about. It's a reliable crash in my main build
world on my laptop.
Dave
>
> > I got a backtrace that shows:
> >
> > (gdb) where
> > #0 0x0000560d3344f03e in qemu_chr_fe_read_all (be=be@entry=0x0,
> > buf=buf@entry=0x7ffea7a2f520 "\v", len=len@entry=12) at
> > /home/dgilbert/git/qemu/chardev/char.c:209
> > #1 0x0000560d33199d64 in vhost_user_read (msg=msg@entry=0x7ffea7a2f520,
> > 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 (dev=dev@entry=0x560d35a614a0,
> > vdev=vdev@entry=0x560d3729cc00, vq=0x560d35a61678, idx=1) at
> > /home/dgilbert/git/qemu/hw/virtio/vhost.c:1070
> > #4 0x0000560d33198cd4 in vhost_dev_stop (hdev=hdev@entry=0x560d35a614a0,
> > vdev=vdev@entry=0x560d3729cc00)
> > 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 (dev=dev@entry=0x560d3729cc00,
> > ncs=<optimized out>, total_queues=total_queues@entry=1) 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 (be=be@entry=0x0, buf=buf@entry=0x7ffea7a2f520
> > "\v", len=len@entry=12)
> > at /home/dgilbert/git/qemu/chardev/char.c:209
> > 209 Chardev *s = be->chr;
> >
> > Dave
> >
> > --
> > Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
> >
> > --
> Marc-André Lureau
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 3+ messages in thread
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2017-02-24 19:51 [Qemu-devel] make check: crash in vhost-user chardev cleanup Dr. David Alan Gilbert
2017-02-24 20:08 ` Marc-André Lureau
2017-02-24 20:12 ` Dr. David Alan Gilbert
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