"btrfs_reserve_extent: Assertion `ret` failed." during btrfsck --init-csum-tree

Hi together,
after a btrfs was missing some csums and therefore remounted read-only, I unmounted it and experienced

    $ sudo btrfsck --init-csum-tree /dev/sde1
    Creating a new CRC tree
    Checking filesystem on /dev/sde1
    UUID: bd6298ea-0748-45fe-87c8-eace6793ca89
    Reinit crc root
    extent-tree.c:2657: btrfs_reserve_extent: Assertion `ret` failed.
    btrfs check[0x43d6c1]
    btrfs check(btrfs_reserve_extent+0xb63)[0x443111]
    btrfs check(btrfs_alloc_free_block+0x5a)[0x44318c]
    btrfs check[0x436585]
    btrfs check(btrfs_search_slot+0x11d1)[0x4382fc]
    btrfs check(btrfs_csum_file_block+0x3ce)[0x4477cc]
    btrfs check(cmd_check+0xef2)[0x425ef5]
    btrfs check(main+0x15d)[0x40991d]
    /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5)[0x7f405dcf8ec5]
    btrfs check[0x4094d9]

with btrfs-progs 3.18-rc1 on Linux 3.17.6. What could that mean?

-Kalle
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