[Bug 204521] [new driver] [request] Port rtsx from OpenBSD to FreeBSD

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204521

--- Comment #231 from Gary Jennejohn <gljennjohn at gmail.com> ---
(In reply to unitrunker from comment #228)
This is pretty weird.  Looking at my kernel. which has the same address for
mmc_go_discovery() as your kernel, the panic is happening in a call to memset()
in the first call to mmc_send_app_op_cond().
Apparently the compiler has optimized mmc_go_discovery() by inlining
mmc_send_app_op_cond(), since that function is only used in mc_go_discovery(). 
This conclusion is supported by the fact that there is no entry for
mmc_send_app_op_cond in the ELF header.
The really strange thing is that memset() is being called to zero out a struct
mmc_command cmd which is on the kernel stack.  That should bever raise an
error.  It should also never result in a calltrap, because this is an in-kernel
call.
I must admit that I can see no way that this error could happen.

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