I am getting the below trace on 2.6.17-rc2 / AMD x86_64 / PCIX HCA 
with both the IB sources that come with the kernel and svn trunk 6520.

This happens if i just modprobe -r ib_mthca after fresh reboot, can
anyone reproduce it on her/his system as well? The module does get 
modprobed out.

Or.

$ modprobe -r ib_mthca

$ dmesg

slab error in kmem_cache_destroy(): cache `ib_mad': Can't free all objects

Call Trace: <ffffffff8106decf>{kmem_cache_destroy+150}
        <ffffffff88094615>{:ib_mad:ib_mad_cleanup_module+25}
        <ffffffff810447ef>{sys_delete_module+415} 
        <ffffffff8112f0cf>{__up_write+20}
        <ffffffff8105ce8b>{sys_munmap+91} 
        <ffffffff81009656>{system_call+126}

ib_mad: Failed to destroy ib_mad cache


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