Hi,
Witold Arndt wrote on 2016-06-27 08:53:40 +0200 [Re: [BackupPC-users]
BackupPC_trashClean (?) freezes system]:
> On Sonntag, 26. Juni 2016 22:21:45 CEST Adam Goryachev wrote:
> > Can you login to the server after it has "hung"? I'm assuming yes since
> > you can try to kill the process.
> > I'd strongly suggest checking the various logs, starting with dmesg
> > Also, check the physical "host" to see what it thinks the status of the
> > VM is.
>
> Jep, I can login to the vm and everything besides backuppc is running and
> instantly responsive. Other processes which use the disk have no problem
> reading or wrting and iotop shows no hangups.
are they using the same file system? Can you show us a 'df -T' and perhaps
'df -i' of your BackupPC VM?
> > Almost every time I've tried to kill a process and seen it turn into a
> > zombie, it's because the process was sleeping / waiting for disk IO, and
> > it won't die until after the OS decides the disk IO has failed or succeeded.
>
> This is consistent with the 85% waiting usage, but there are no errors any
> log
> (dmesg, syslog, backuppc/log/*) whatsoever.
>
> I'm a bit lost since there were no configuration changes (besides removal and
> addition of backup clients) and this setup has been running since 04/2014.
I would suspect file system corruption. Is the trash directory empty when the
freeze occurs? In general, I'd suggest an 'fsck', but with a BackupPC pool
that might not work. You *could* try moving the trash directory out of the way
and recreating it with the same permissions. This would avoid accessing a
problematic file within it, supposing this is causing the problems. Though,
normally, I'd expect something in the system log files in case of a file
system panic. Well, 'df -T' might tell us more.
Regards,
Holger
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