[rdiff-backup-users] crash in gzip.py

[Lew Wolfgang]

Hi Folks,

I occasionally encounter an error that terminates a backup
and requires a "--check-destination-dir" run to recover.

The error seems to be associated with gzip.py being asked to
do a negative seek in write mode.  The docs for gzip.py explicitly
say it can't do this.  I'm not sure about which file(s) cause this
error, bit it might be one of the firefox user  .cache files.  This
is on an openSUSE 13.2 Linux system with rdiff-backup 1.2.8.

Any ideas?

 File "/usr/lib64/python2.7/gzip.py", line 423, in seek
    raise IOError('Negative seek in write mode')
IOError: Negative seek in write mode

Thanks,
Lew