[rrd-users] ERROR: attempting to write beyond end of file

[Tobias Oetiker]

Hi Stefan,

Today Stefan Brandl wrote:

> On Tue, Jan 18, 2011 at 08:46:26AM +0100, Tobias Oetiker wrote:
> > Hi Stefan,
> >
> > Yesterday Stefan Brandl wrote:
> >
> > > As far I can see, this is already implemented in 2170.
> >
> > yes it is ...
> >
> > > With mmap disabled the error is gone,
> > > but with mmap I still get:
> > >
> > > noc at lowrider:~$ /opt/rrdtool-1.4.5.002170/bin/rrdtool create tester.rrd DS:inet:GAUGE:600:0:U RRA:AVERAGE:0.5:1:600
> > > noc at lowrider:~$ /opt/rrdtool-1.4.5.002170/bin/rrdtool resize tester.rrd 0 GROW 100
> > > ERROR: attempting to write beyond end of file
> > > noc at lowrider:~$
> >
> > beats me ... I can not reproduce this here ... and valgrind can not
> > find a fault either ...
> >
>
> Hm very strange, but at least one other user has the same problem:
> http://osdir.com/ml/debian-bugs-dist/2010-07/msg05757.html
>
> > what is realy strange about this error is, that it is not a system
> > messsage but rather an internal check in the rrdtool code which
> > thinks there is something wrong ...
> >
>
> Can I do anything to debug this?
> While writing this E-Mail i did some tests.
> 2170 with mmap disabled works as expected, no error ist given.
> And now the "strange" thing:
> If I create a rrd file with mmap enabled (or any older version
> of rrdtool) I get the above error when resizing.
> Despite of the error, I get a resize.rrd.
> And the resulting resize.rrd doesn't differ from the one
> created with 2170 with mmap disabled.
> So the error message seems just to be cosmetical and no real error.

it is bound to be something like that ... off by one ... you could
add some code to the error message to have rrdtool tell you the
position it gets and the position it expects ... maybe it is some
strange off by one thing ...

cheers
tobi

>
>
> Stefan
>
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>

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900