On Tue, 3 Jun 2008, Paul E. McKenney wrote:
quoted text
> 
> The fact that put_io_context() was called from exit_io_context() means
> that this is the last thread of a process exiting.  The fact that
> cfq_free_io_context() was called (via cfq_dtor()) from put_io_context()
> means that this was the last reference to the io_context.  Yet when
> we traverse the cic_list, part of it is corrupted -- ascii "k"s through
> RAX and RBX.

The "ascii 'k's" are just the slab POISON_FREE byte (0x6b).

IOW, something simply kfree'd the memory too early, causing the list 
traversal to then break.

		Linus
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