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Date:      Thu, 18 Jun 2020 09:23:17 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 204521] [new driver] [request] Port rtsx from OpenBSD to FreeBSD
Message-ID:  <bug-204521-227-4voBm1v9SB@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-204521-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-204521-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D204521

--- Comment #231 from Gary Jennejohn <gljennjohn@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 mems=
et()
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=
().=20
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 str=
uct
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-ke=
rnel
call.
I must admit that I can see no way that this error could happen.

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