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Date: Fri, 12 Nov 2010 23:02:23 +0100
From: Jan Kiszka <jan.kiszka@web.de>
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Subject: [Qemu-devel] virtio-blk broken after system reset
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To: qemu-devel <qemu-devel@nongnu.org>
Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

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Hi,

both after hard and guest-initiated reset, something is seriously broken
with virtio block devices. If I reset my Linux guest while still in
grub, the bios will simply fail to read from the disk after the reboot. I=
f I
reset after Linux touched the device, qemu terminates:

Breakpoint 1, 0x00007ffff4b945b0 in _exit () from /lib64/libc.so.6
(gdb) bt
#0  0x00007ffff4b945b0 in _exit () from /lib64/libc.so.6
#1  0x00007ffff4b2948d in __run_exit_handlers () from /lib64/libc.so.6
#2  0x00007ffff4b29535 in exit () from /lib64/libc.so.6
#3  0x0000000000568da3 in virtqueue_num_heads (vq=3D0x17040e0, idx=3D0) a=
t /data/qemu/hw/virtio.c:258
#4  0x0000000000569511 in virtqueue_pop (vq=3D0x17040e0, elem=3D0x17cea58=
) at /data/qemu/hw/virtio.c:388
#5  0x0000000000419e31 in virtio_blk_get_request (s=3D0x1704010) at /data=
/qemu/hw/virtio-blk.c:132
#6  virtio_blk_handle_output (vdev=3D0x1704010, vq=3D<value optimized out=
>) at /data/qemu/hw/virtio-blk.c:369

This is with current qemu.git head, haven't tried older versions. Known b=
ug?

Jan


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