Re: commands like "du", "df", and "btrfs fs sync" hang

[Kai Krakow <hurikhan77@gmail.com>]

Am Thu, 5 May 2016 08:35:37 +0200
schrieb Kai Krakow <hurikhan77@gmail.com>:

> Am Tue, 3 May 2016 08:48:14 +0200
> schrieb Kai Krakow <hurikhan77@gmail.com>:
> 
> > Am Sun, 1 May 2016 20:39:31 -0400
> > schrieb Nicholas D Steeves <nsteeves@gmail.com>:
> >   
> > > On 1 May 2016 at 03:00, Kai Krakow <hurikhan77@gmail.com>
> > > wrote:    
>  [...]  
> > > 
> > > Out of curiosity, does this occur if you don't create or delete
> > > snapshots, or if your backup script doesn't create or delete
> > > snapshots?  And when it occurs, are you able to go to another
> > > terminal and run a command that you don't use often, that
> > > definitely had to be read from disk, but that doesn't query any
> > > filesystem properties (eg: whois)?    
> > 
> > I only create snapshots in the destination device, not on the
> > source. I could try disabling the snapshotting and see if it
> > changes things.
> > 
> > It seems from my observation, that only programs querying disk free
> > or disk usage status hang, especially all of the btrfs subcommands
> > doing it hang, in addition to traditional programs like du and df.
> > I think also "btrfs sub delete" and friends hang. So your guess may
> > very well go into the right direction. Let me try. Coming back
> > later...  
> 
> With the snapshot and sync related bits disabled in my script, I no
> longer experience freezing df/du/... commands.

Ah well, I still do - it just triggers much less often.

But I can track it down to the automounter now: As soon as I stop the
automounter of my backup device, du/df/etc no longer hang. Still I'm
not sure if the problem is originating from btrfs or autofs itself.

-- 
Regards,
Kai

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