On Thu, Apr 06, 2017 at 02:08:47PM -0500, Eric Blake wrote:
> When a block device that is part of a throttle group is hot-unplugged,
> we forgot to remove it from the throttle group. This leaves stale
> memory around, and causes an easily reproducible crash:
> 
> $ ./x86_64-softmmu/qemu-system-x86_64 -nodefaults -nographic -qmp stdio \
> -device virtio-scsi-pci,bus=pci.0 -drive \
> id=drive_image2,if=none,format=raw,file=file2,bps=512000,iops=100,group=foo \
> -device scsi-hd,id=image2,drive=drive_image2 -drive \
> id=drive_image3,if=none,format=raw,file=file3,bps=512000,iops=100,group=foo \
> -device scsi-hd,id=image3,drive=drive_image3
> {'execute':'qmp_capabilities'}
> {'execute':'device_del','arguments':{'id':'image3'}}
> {'execute':'system_reset'}
> 
> Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1428810
> 
> Suggested-by: Alberto Garcia <berto@igalia.com>
> Signed-off-by: Eric Blake <eblake@redhat.com>
> ---
>  block/block-backend.c | 3 +++
>  1 file changed, 3 insertions(+)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>