Thanks for reporting this bug and doing the analysis.
Despite your pinpointing, I'm afraid I don't quite understand where you
are saying the problem is. I'm sorry, please bear with me. The
QLIST_FOREACH variables are (var, head, field), so we start with
&s->cluster_allocs as head, assign 'old_alloc' to
s->cluster_allocs.lh_first to begin, use that in the loop, and then on
each iteration we set old_allocs = old_allocs->next_in_flight.le_next.
What are you saying we should be using instead?
can you tell me exactly how to reproduce this, with a precise 'qemu-img
create' command, precise kvm command, and how big the qcow2 image is
when it hangs? Given how reproducible it is for you, I"m surprised I
haven't run into it, so I imagine you must be using different options
than I usually do. I'll try to reproduce with your exact options, so
that I can try on the upstream qemu version to see if this has been
fixed upstream.
Thanks again.
** Changed in: qemu-kvm (Ubuntu)
Importance: Undecided => High
** Changed in: qemu-kvm (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/917824
Title:
qemu loops/hangs on extending qcow2-diskspace
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