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由 Fam Zheng 提交于
bdrv_replace_child_noperm tries to hand over the quiesce_counter state from old bs to the new one, but if they are not on the same aio context this causes unbalance. Fix this by setting the correct aio context before calling bdrv_append(). Reported-by: NEd Swierk <eswierk@skyportsystems.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NFam Zheng <famz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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