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[Qemu-devel] virtio-blk broken after system reset


From: Jan Kiszka
Subject: [Qemu-devel] virtio-blk broken after system reset
Date: Fri, 12 Nov 2010 23:02:23 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666

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. If 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=0x17040e0, idx=0) at 
/data/qemu/hw/virtio.c:258
#4  0x0000000000569511 in virtqueue_pop (vq=0x17040e0, elem=0x17cea58) at 
/data/qemu/hw/virtio.c:388
#5  0x0000000000419e31 in virtio_blk_get_request (s=0x1704010) at 
/data/qemu/hw/virtio-blk.c:132
#6  virtio_blk_handle_output (vdev=0x1704010, vq=<value optimized out>) at 
/data/qemu/hw/virtio-blk.c:369

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

Jan

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