2.5.31 qlogic error "this should not happen"
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Try applying the attached patch and see if it helps you out any.
The box locked up while running bonnie++ with the patch. One difference was without the patch, it printed the "this should not happen" 9 times. With the patch, it printed 54 times (6 times more), if that's any kind of clue.
I'm trying Eric's suggestion to change QLOGICFC_REQ_QUEUE_LEN from 127 to 255 on top of your patch.
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Randy Hron http://home.earthlink.net/~rwhron/kernel/bigbox.html