Re: Race condition in module load causing undefined symbols

["K.R. Foley" <kr@cybsft.com>]

Steve Lord wrote:
> Andrew Morton wrote:
>
> > Stephen Lord <lord@xfs.org> wrote:
> >
> > > Pozsár Balázs wrote:
> > > > On Sat, Jun 11, 2005 at 08:23:20AM -0500, Steve Lord wrote:
> > > > >>I think this is not actually module loading itself, but a problem
> > > >>between the fork/exec/wait code in nash and the kernel.
> > > > > > I do not use nash, only bash, so this is not a nash-specific 
> > > issue.
> > > > >
> > > I disabled hyperthreading and things started working, so are there any
> > > HT related scheduling bugs right now?
> >
> >
> >
> > There haven't been any scheduler changes for some time.  There have 
> > been a
> > few low-level SMT changes I think.
> >
> > Are you able to identify which kernel version broke it?
>
> Still have not narrowed this down too far, disabling SMT made no
> difference, disabling SMP did, which I was expecting.
>
> Steve

I initially saw this with 2.6.12-rc1 and every version up through rc3. I
haven't tried with later versions. :-/ I initially reported here:
http://marc.theaimsgroup.com/?l=linux-kernel&m=111235814529008&w=2

The way that I got around it was to compile in my aic7xxx driver instead
of making it a module. I have also recently received an email from
someone saying that disabling module unloading would also solve it. That
very well may be true since I did run into another booting problem
(2.6.12-rc5) that disabling module unloading fixed :-/ I haven't had a
chance to go back and check this out though.

So to summarize: I have a dual 933 with aic7xxx compiled in to get
passed the problem described above. I have a dual 2.6 w/HT that I have
disabled module unloading to get passed another boot condition.


--
   kr

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