Hi Jeff,
there is a problem in ubd / aio on host 2.4, that I can reproduce easily. I inserted some counters into submit_aio(), not_aio_thread() and ubd_intr(). If the problem occurs, both submit_aio_24() and not_aio_thread() are waiting for a write to pipe to complete, while both pipes are filled with 57 entries each.
Since SIGIO is blocked at that time, ubd_intr() isn't started, and the system hangs.
I think, we have to add some "flowcontrol", but have no idea how to do this.
I don't know, if this could be problem on 2.6 host also.
Bodo
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