[Bug 246279] ciss device driver not allowing more than 48 drives to be detected by the CAM layer

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246279

--- Comment #42 from Peter Eriksson <pen@lysator.liu.se> ---
(In reply to commit-hook from comment #33)

> I've also noted my extreme reservations about making the cr == NULL
> panic just a printf. There's some race that's causing it (I think
> with where we set the shutdown flag racing another thread that's setting it w/o 
> ciss_mtx held). Ideally, someone would chase that to ground who had the hardware and > the time to do so, but I do not.

Perhaps we should make that panic / printf fix selectable via a sysctl knob? I
agree that there is a bug somewhere since with the change to printf() I
sometimes see a never-ending loop with errors instead. However, that takes
longer to "develop" than the panic-reboot so it still makes it a bit more
usable... It typically occurs with bad disks though, so another fix is to
remove the bad disks :-)

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