[Qemu-devel] virtio-scsi WRITE_VERIFY crash

[Venkatesh Srinivas]

Hi,

When a Linux guest does a simple 'sg_verify /dev/<scsi disk on a
virtio-scsi HBA>', qemu (-master from git) crashes, tripping an
assertion in scsi-disk.c:scsi_dma_complete(), that the completing DMA
command has no IOCB.

The callpath is:
scsi_dma_complete
dma_complete
dma_bdrv_cb
dma_bdrv_io
dma_bdrv_read
scsi_do_read
bdrv_co_em_bh
aio_bh_poll
aio_poll.

At the assertion, we have a zero-element iovector and the request has
a status of -1.

-- vs;