jon@astro.ucla.edu (Jonathan Eisenhamer) (07/07/89)
To All Spots, A while ago, I asked: > > To All Spots, > > Yes, here is another "what is that panic" question: > What is the panic: > > panic: dup biodone > > The system then reboots. Any help would be appreciated and all answers > will be summarized to the net. > As promised, this is the basic answer: For DMA operations, there is a flag called B_DONE associated with the memory used for the I/O. When an DMA I/O operation is complete, the software that initiated the DMA operation (usually a driver) calls a routine biodone() that among other things, sets the B_DONE flag. If, for whatever reason, the B_DONE flag has already been set, the above panic occurs. Almost assuredly this is an indication of a software problem in the driver. For us, this was directly associated with the installation of new equipment and the associated drivers. The problem is now in the process of being repaired. Thanks again to all those who replied!!! Jonathan Eisenhamer jon@astro.ucla.edu jon@uclastro.bitnet bonnie::jon (span 5.708) (213)206-8596