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

[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:
> > Hello!
> >
> > I'm not sure what triggeres this, neither if it is btrfs specific.
> > The filesystems have been recreated from scratch. Mainly during my
> > rsync backup (from btrfs to btrfs), but not necessarily limited to
> > rsync usage, my system experiences uninterruptable freezes of
> > commands like "df", "du", "btrfs fs sync", and probably more.  
> 
> 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...

-- 
Regards,
Kai

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