Fwd: [OpenAFS] mmap issue?
Fri, 23 Mar 2012 16:13:26 -0400
since i blew it and didn't reply-all earlier...
---------- Forwarded message ----------
From: Derrick Brashear <firstname.lastname@example.org>
Date: Fri, Mar 23, 2012 at 3:00 PM
Subject: Re: [OpenAFS] mmap issue?
On Fri, Mar 23, 2012 at 2:52 PM, Eric Chris Garrison <email@example.com> w=
> I've had a complaint from one of our users. =A0He says:
> "I just had afs do a very very nasty thing to me. =A0 I ran a program on
> a data file and for some unknown reason the file was totally corrupted
> after running this program. =A0 I can absolutely certify that the problem
> is not the program itself because I ran exactly the same program on a
> local disk and it did what I was asking it to do without corrupting the
> I suspect strongly this problem is created by memory mapping of the file
> which I think this program is implicitly using. =A0 The actual thing I wa=
> running was a perl script, but it was calling programs I am pretty sure
> do memory mapping for io speed."
> I asked him for details, and he is using code that uses this:
> "I was running a program in the "Antelope" package sold by brtt.com.
> The particular program is a perl script called dbfix_calib. However, the
> offender is almost certainly this line
> system( "dbjoin $dbname.$table calibration | dbset -v - $table.calib
> 'calib =3D=3D NULL' calibration.calib" );"
> He is running OpenAFS 1.5.77 for MacOS 10.6.8, and our servers are at
The server's not an issue here (if you'd said 1.6.0 I'd have told you
you wanted 1.6.1pre4)
That macos client is ancient and i haven't got a clue what bugs it might ha=
If you can give me a test I am happy to verify behavior in a current build.
> I've searched for this, and it appears mmap operations used to be a
> problem. =A0At what version of OpenAFS (server and client) should we be a=
> for this to not be a problem?
> Thank you,
> Eric Chris Garrison | Principal Mass Storage Specialist
> firstname.lastname@example.org =A0 =A0 | Indiana University - Research Storage
> 317-278-1207 =A0 =A0 =A0 =A0| Jabber IM: email@example.com