Anton Blanchard [off-list ref] wrote:

quoted

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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