That appears to have been the problem and the solution.  Thank you!

ATB,

    Paul

On 26/11/2020 10:41, David While via BackupPC-users wrote:
>
> Have a look here https://github.com/backuppc/backuppc/issues/369
>
> I think this might be the same problem - not actually a problem with
> BackupPC but with rsync.
>
> David While BSc(Hons) MBSC CEng CITP
>
> On 26/11/2020 10:19, Paul Leyland wrote:
>>
>> Another problem has cropped up with the newly installed 20.04LTS release.
>>
>> The Ubuntu system backs up several other machines as well as itself,
>> one of which runs Ubuntu 20.10, two Gentoo boxes and a Windows 10
>> machine. The Linux boxes all use rsync whereas the Windows box
>> exports its disk to the backup machine which mounts it with Samba.
>> Backups of the server and of its Windows client work fine.
>>
>> So far the other Ubuntu system and one Gentoo box go into a strange
>> failure mode. It is possble that the other may do so too but it
>> hasn't had chance to do so yet.
>>
>> The failure goes as follows.  First a backup, whether incremental or
>> full doesn't matter, is started. I monitor its progress with lsof on
>> each system to see what is being read and written.  I also use "ls
>> -larts" in active subdirectories of /var/lib/backuppc/pc/PCNAME/new
>> to monitor what is being written and read.  All goes well for a long
>> time then activity apparently ceases, but only apparently.
>>
>> What is really happening is that the newly formed XferLOG.z grows
>> enormously. Until it was killed just now, that file had reached
>> 4180700817 bytes (3.9GiB) after 6 hours and then stopped growing. A
>> typical log file might be 20MiB.  Examination with BackupPC_zcat on
>> the giant file shows the regular log lines for a long time but
>> eventually turns into binary mush.
>>
>> The NewFileList file is also strange. It ends part way through a
>> standard line as follows:
>>
>> 486f208a006a335645ec1839b9c001ac 189
>> f%2f/flib/ffirmware/fcxgb4/fconfigs/attrib
>> bc6f59e44fdcdac6a4034b43f588bafe 449 f%2f/flib/ffirmware/fcxgb4/attrib
>> 3f250cfd4201077c6e341454dd042d3c 766 f%2f/flib/ffi
>>
>> and is 24756 (i.e. 6 * 4096) bytes long.
>>
>> Anyone else seen similar behaviour and / or have an idea as to what
>> may be going wrong?
>>
>>
>> Thanks,
>>
>>     Paul
>>
>>
>>
>>
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