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    SubjectRe: 2.6.26-rc4: RIP __call_for_each_cic+0x20/0x50

    On Tue, 3 Jun 2008, Paul E. McKenney wrote:
    > 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.


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