xfs_repair 3.1.4/3.1.5: fatal error -- couldn't malloc dir2 buffer data

[Marc Lehmann <schmorp@xxxxxxxxxx>]

When trying to xfs_repair a 15GB image file, I get this:

Phase 3 - for each AG...
        - scan and clear agi unlinked lists...
        - process known inodes and perform inode discovery...

fatal error -- couldn't malloc dir2 buffer data

this is 3.1.5 - 3.1.4 simply segfaults. using ltrace shows this as
last call to malloc:

   malloc(18446744073708732928)                                  = NULL

I think thats a bit unreasonable of xfs_repair :)

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