Re: 2.6.3-rc2-mm1

[Andrew Morton]

Anton Blanchard <anton@xxxxxxxxx> wrote:
>
>  
> > This kernel and also 2.6.3-rc1-mm1 have a nasty bug which causes
> > current->preempt_count to be decremented by one on each hard IRQ.  It
> > manifests as a BUG() in the slab code early in boot.
> > 
> > Disabling CONFIG_DEBUG_SPINLOCK_SLEEP will fix this up.  Do not use this
> > feature on ia32, for it is bust.
> 
> A few questions spring to mind. Like who wrote that dodgy patch? 

The dog wrote my homework?

> And any ideas how said person (who will remain nameless) broke ia32?

Not really.  I spent a couple of hours debugging the darn thing, then gave
up and used binary search to find the offending patch.

<looks>

include/asm-i386/hardirq.h:IRQ_EXIT_OFFSET needs treatment, I bet.  
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