> There seems to be an issue if we try to build a btrfs based FS that
> is less than 70M, we get the following assertion failure:
> 
> mkfs.btrfs: extent-tree.c:2682: btrfs_reserve_extent: Assertion
> `!(ret)' failed.

> mkfs.btrfs -b 104857600 -r rootfs rootfs.btrfs

Honestly, the path of least resistance is probably to avoid the -r
option all together.  As you've found, it's not reliable.

I'd take the time to roll the infrastrcture to populate the image by
writing to a mounted image with the kernel code.

- z
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