I have an IDE disk which shows up with zero geometry values (zero
sectors/track, zero heads, zero cylinders).  This produces a
divide-by-zero trap in the kernel at boot time when diskerr() tries to
work out the C/H/S location of an erroring block (which occurs when the
kernel tries to read the beginning of the disk to figure out the boot
device - this is on i386).

Now, this disk is obviously rather broken.  But it seems to me that
panicking is not a correct response.  What do you people think?  Worth
a PR, or is this a sufficiently drastic hardware failure that it
doesn't really much matter what the kernel's reaction is?

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