[Libguestfs] nbdkit: cow.c:591: cow_extents: Assertion `count > 0' failed.

[Richard W.M. Jones]

I wonder if this is an overflow:

$ ./nbdkit sparse-random 3G --filter=cow --run 'nbdinfo --map $uri'
# OK

$ ./nbdkit sparse-random 4G --filter=cow --run 'nbdinfo --map $uri'
nbdkit: cow.c:591: cow_extents: Assertion `count > 0' failed.

Any size >= 4G seems to cause the crash.

Rich.

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Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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