On Fri, Apr 27 2007, James Bottomley wrote: > > sgpnt[0:1] page c1ee5af0/0x1ee5af0 length 32 > > Kernel panic - not syncing: Buffer at physical address > 16 Mb used for aha1542 > > > > As before, no problems using the sda hard disk (which is the boot drive): > > everything works reliably until I touch the cdrom drive. > > > > I'll be happy to assist with the debugging, but the system with the > > aha1542 has no development facilities, i.e., I'll have to build test > > kernels on a different system, and turnaround is going to be slow :-(. > > I'm interested. > > This is clearly a use_sg==1 path that has failed to bounce the buffer > for some reason ... and I was contemplating eliminating the GFP_DMA from > our sr driver because I thought the block bouncing had it covered. > > It might also be helpful to apply this patch. It should give a stack > trace of the problem command and not immediately panic the box. It's due to the crappy ->generic_packet() ioctl stuff, it bypasses the block layer. So that needs to be converted to use block pc requests and the block layer interface, then things will just work. Christoph had a sort-of ready patch for that some time ago. Christoph, did that ever materialize into a full blown patch? -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
