xfs_repair: "fatal error -- ran out of disk space!"

[Patrick J. LoPresti]

I have a 5.1TB XFS file system that is 93% full (399G free according to "df").

I am trying to run "xfs_repair" on it.

The output is appended.

Question:  What am I supposed to do about this?  "xfs_repair -V" says
"xfs_repair version 3.1.5".  (I downloaded and built the latest
version hoping it would fix the issue, but no luck.)  Should I just
start deleting files at random?

Any ideas would be appreciated; I am trying to get this server back
up, and restoring 5.1T is not going to be pleasant.

Thanks!

 - Pat


Phase 1 - find and verify superblock...
Phase 2 - using internal log
        - zero log...
        - scan filesystem freespace and inode maps...
sb_icount 42688, counted 59328
sb_ifree 1, counted 36
sb_fdblocks 104582610, counted 24
        - found root inode chunk
Phase 3 - for each AG...
        - scan and clear agi unlinked lists...
        - process known inodes and perform inode discovery...
        - agno = 0
        - agno = 1
        - agno = 2
        - agno = 3
        - agno = 4
        - agno = 5
        - process newly discovered inodes...
Phase 4 - check for duplicate blocks...
        - setting up duplicate extent list...
        - check for inodes claiming duplicate blocks...
        - agno = 0
        - agno = 2
        - agno = 3
        - agno = 5
        - agno = 4
        - agno = 1
Phase 5 - rebuild AG headers and trees...
        - reset superblock...
Phase 6 - check inode connectivity...
        - resetting contents of realtime bitmap and summary inodes
        - traversing filesystem ...

fatal error -- ran out of disk space!