Craig Barratt wrote at about 00:46:47 -0700 on Monday, October 27, 2008:
> Jeffrey writes:
>
> > Can't call method "isCached" on an undefined value at
> > /usr/share/BackupPC/lib/BackupPC/Xfer/RsyncFileIO.pm line 165.
>
> That isn't good. This is the case where it is doing a random check
> of the cached checksums (based on $Conf{RsyncCsumCacheVerifyProb}).
> I am missing an error check just prior to this line of code. An
> error will occur if there is some problem open/reading the cached
> checksum information. A possible cause might be some file system
> corruption.
>
> I'd be curious what the error is. Just prior to this line
> you could add this code:
>
> if ( $err ) {
> $fio->log("Can't get rsync digests from $attr->{fullPath}"
> . " (err=$err, name=$f->{name})");
> $fio->{stats}{errorCnt}++;
> return -1;
> }
>
> Alternatively, just set $Conf{RsyncCsumCacheVerifyProb} to 0. This
> code will be skipped, and I suspect it will fail further down and
> there is an error check there. Seeing the error number would be
> helpful.
>
> I would also try removing the --checksum-seed=32761 option from
> $Conf{RsyncArgs} and trying the backup again. This will disable
> the use of cached checksums.
>
> Craig
Interesting -- I ended up having to reboot (which of course required a
restart of the backuppc service) and the problem went away.
This is the second time this has happened to me.
I suspect (in a fuzzy type of way) that somehow this may have been
caused by my rebooting the nfs server (which is mounted on
/var/lib/BackupPC) without doing something like restarting the
backuppc service - the result was that for some time there may have
been a stale nfs link hanging around and it is possible that this
occurred during the middle of a backup. I also may have killed the
BackupPC_dump process using 'kill -9' when I was unable to kill it
from the web interface.
I wish I could replicate this better so I could confirm the
cause/effect here but I have definitely been doing a lot of
starting/stopping of both nfs and backuppc as I learn and get it set
up.
Still... it would be nice to get some type of email or other warning
when a backup freezes up because conceivably one could be unaware of
this issue for days...
I will keep your troubleshooting patch in mind and will use it next
time I see this problem.
THANKS!
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