diff -Naur qemu-kvm-0.12.5.orig//posix-aio-compat.c qemu-kvm-0.12.5/posix-aio-compat.c
--- qemu-kvm-0.12.5.orig//posix-aio-compat.c	2010-07-27 01:43:53.000000000 +0100
+++ qemu-kvm-0.12.5/posix-aio-compat.c	2010-08-07 01:49:07.051265778 +0100
@@ -597,6 +597,7 @@
     acb->aio_type = QEMU_AIO_IOCTL;
     acb->aio_fildes = fd;
     acb->ev_signo = SIGUSR2;
+    acb->async_context_id = get_async_context_id();
     acb->aio_offset = 0;
     acb->aio_ioctl_buf = buf;
     acb->aio_ioctl_cmd = req;