Solved -- my error. I completely forgot that I had used config to make a kernel from the Stable kernel, disabling devices that don't exist in this machine, or so I thought. Fortunately, when I installed it, I saved the stock Stable kernel.
I took your suggestion and downloaded a current snapshot and booted the cd. Plugging and unplugging the USB disk caused no trouble. Then I tried the 5.8 install disk. Worked fine. That's when I remembered the config'ed kernel. So I booted the system with the stock Stable kernel and that worked fine, too, not surprisingly. So thank you for your help and sorry for the false alarm. /Don Allen On 11/12/15, Stefan Sperling <s...@stsp.name> wrote: > On Thu, Nov 12, 2015 at 12:53:06PM -0500, Donald Allen wrote: >> fdisk and disklabel output below. >> >> I should note that the panic is reproducible. I rebooted the problem >> system and tried plugging and unplugging the USB drive and it panicked >> again. The HP laptop, running the 5.8 install cd system, exhibits no >> such problems. Plug the same drive in and I get a device address >> normally in dmesg. Unplug it, no problem. So it appears there is >> something about the USB hardware in the problem machine that is >> confusing the OpenBSD driver. I should note that I've run Linux and >> FreeBSD on the same machine with no USB issues of this kind with the >> same drive. > > Please try -current. ddb in -current should show a trace by default.
