Unplug a SCSI disk which is currently being accessed, then after a few minutes plug it back in again.
The host sometimes panics with the message:
kernel BUG at block/blk-core.c:1944. ... RIP [<ffffffff812473e5>] blk_dequeue_request+0xa5/0xc0
- RHEL 6.1.z kernels
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