[rdiff-backup-users] Process hangs 100% with no strace activity

[Lorenzo Campanelli]

Hello,
    I've been trying to troubleshoot an intermittent issue where a
rdiff-backup process gets stuck in an infinite loop with 100% CPU
cycles (shown via top).  When I check the processes using strace,
there is no activity.  I tried seeing if removing old slices would
help prevent this, but it comes back even when there are small amounts
of slice files.  Can this happen if the files are being
accessed/modified during backup?  Is this a sign of possible file
system corruption? My system log doesn't show anything regarding that,
but is this what could cause rdiff-backup to get stuck?  Have any tips
on troubleshooting this further?

-Lorenzo