Re: spinlocks() are severely broken in 2.2.X and 2.4.X for modules

[Andi Kleen]

On Sat, Jul 01, 2000 at 02:32:15PM +0200, Andi Kleen wrote:
> On Sat, Jul 01, 2000 at 11:59:11AM +0200, Manfred Spraul wrote:
> > Andi Kleen wrote:
> > > 
> > > I had it happen to me in the past too for my sysctl rewrite. In this
> > > case it happened in the main kernel for a .sysctl -> .data relocation.
> > > It happened in the main vmlinux. It seems to require some complex
> > > input to trigger (it is not as simple as intersegment relocation does not
> > > work). In my case I had a few hundred relocations and one was wrong
> > > and caused crashes.
> > > 
> > 
> > Is it possible to detect the problem automatically until binutils is
> > fixed? (objdump + script)
> 
> Here is a quick hack. The results are slightly off because of section
> padding though. It only works on object files or modules (vmlinux doesn't
> have any reloc records) 

[...]

Ok, it breaks with semaphores too. That probably explains the off-ness.

Also of course it only makes sense to run it with kernel modules that went
through ld -r

-Andi