Message-ID: <3F103018.6020008@pobox.com>
Date: Sat, 12 Jul 2003 11:58:16 -0400
From: Jeff Garzik <jgarzik@pobox.com>
Organization: none
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To: Jamie Lokier <jamie@shareable.org>
CC: Dave Jones <davej@codemonkey.org.uk>,
       Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: 2.5 'what to expect'
References: <20030711140219.GB16433@suse.de> <20030712152406.GA9521@mail.jlokier.co.uk>
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Jamie Lokier wrote:
> Dave Jones wrote:
> 
>>- Some people seem to have trouble running rpm, most notably Red Hat 9 users.
>>  This is a known bug of rpm.
>>  Workaround: run "export LD_ASSUME_KERNEL=2.2.5", before running rpm.
> 
> 
> Ah, _thank you_.
> 
> It's not an rpm bug, as such; it's a problem/bug with DB4, the
> Berkeley DB library.
> 
> I just spent 2 hours trying to figure out why rpm was failing.
> write() returning EINVAL for no reason?  Finally spotted that O_DIRECT
> was the significant bit.

You got it.  db4+O_DIRECT == blah.  (I just had a conversation yesterday 
with rpm's maintainer about what the problems are)

One problem is O_DIRECT should return an error on open(2) or fcntl(2), 
not write(2).

Another problem appears to be that db does not know about the alignment 
requirements of O_DIRECT.


> End result: I copied an rpm database from another machine.  It's wrong
> for this machine, but nearly right.  Ah well.
> 
> If I'd only known about the LD_ASSUME_KERNEL fix sooner.

Unfortunately, LD_ASSUME_KERNEL is a lucky hack, not a fix.  rpm dlopens 
a pam .so.  LD_ASSUME_KERNEL doesn't work for that .so, only for rpm 
itself...  fun ensues.

	Jeff


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