Re: [Libguestfs] [PATCH nbdkit] cow: Fix assert failure in cow_extents

$ nbdkit sparse-random 4G --filter=cow --run 'nbdinfo --map $uri' nbdkit: cow.c:591: cow_extents: Assertion `count > 0' failed. This is caused because nbdinfo calls us with count = 0xfffffe00 which is rounded up to the next boundary and overflows (so count = 0). Use a 64 bit variable for count to allow rounding up. --- tests/Makefile.am | 2 ++ filters/cow/cow.c | 16 +++++++++--- tests/test-cow-extents-large.sh | 46 +++++++++++++++++++++++++++++++++ 3 files changed, 61 insertions(+), 3 deletions(-)