https://bugzilla.novell.com/show_bug.cgi?id=642078
https://bugzilla.novell.com/show_bug.cgi?id=642078#c2
--- Comment #2 from Dongyang Li 2010-10-21 14:03:30 UTC ---
This is because of we use qemu-dm to handle blktap requests,
when qemu-dm starts, it will first xenstore_parse_domain_config(), which will
read the xenstore and see the tapdisk, and an entry was added into
drives_table,
then blktapctrl daemon got the watch fired by xenstore, and it tries to connect
the qemu-dm instead of the tapdisk daemon(upstream xen 4.0.1 does this), and
qemu-dm got the request of adding the vbd so another entry of the same image
was added, with a different type IF_BLKTAP.
I think using the upstream xen 4.0.1 way could make the problem go away, any
reason why we are handling tapdisk with qemu-dm?
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