Date: Mon, 1 Nov 2021 12:55:49 +0530 From: "Kamal R. Prasad" <kamalpr@gmail.com> To: Ian Lepore <ian@freebsd.org> Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: bug in mmc driver Message-ID: <CAK=yUGLqcK96ZKh9DAccp19Xoq7gkaz7vK0fPeUHE3sTwRaWbQ@mail.gmail.com> In-Reply-To: <22fb38d9b6cda8baec08713159bb65afcc8cd418.camel@freebsd.org> References: <CAK=yUG%2Bu9K3=9yHKeabBkyKx%2B6=mGy3_cKXaJeTa75OQ%2BbTJYg@mail.gmail.com> <22fb38d9b6cda8baec08713159bb65afcc8cd418.camel@freebsd.org>
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yes it is a problem in mmc/sd controller. I will check if the no of
times we release bus matches acquiring bus.
The controller is a micron controller with this output from
# geom ls disk
Geom name: flash/spi0
Providers:
1. Name: flash/spi0
Mediasize: 67108864 (64M)
Sectorsize: 512
Stripesize: 262144
Stripeoffset: 0
Mode: r0w0e0
descr: s25fl512s
ident: (null)
rotationrate: unknown
fwsectors: 0
fwheads: 0
Geom name: mmcsd0
Providers:
1. Name: mmcsd0
Mediasize: 14763950080 (14G)
Sectorsize: 512
Stripesize: 512
Stripeoffset: 0
Mode: r2w2e5
descr: MMCHC R1J57L 1.1 SN 81687B5C MFG 11/2017 by 19 0x004e
ident: 81687B5C
rotationrate: 0
fwsectors: 0
fwheads: 0
On Sat, Oct 30, 2021 at 12:04 AM Ian Lepore <ian@freebsd.org> wrote:
>
> On Fri, 2021-10-29 at 10:02 +0530, Kamal R. Prasad wrote:
> > hello,
> >
> > if i run a stress test on a freebsd system booted from a micron mmc
> > device, and run a script which in a loop opens the same mmc device in
> > read-only mode, it causes a problem in acquiring the bus and panics
> > the box. both the stress test and a script to open the mmc device in
> > read only mode are in user space and so kernel should not have
> > panic'ed. Pl see stack trace from our freebsd derived os.
> >
> > thanks
> > -kamal
> > --------------
> >
> > panic: mmc: host bridge didn't serialize us.
> >
> > [...]
> >
>
> This indicates a problem in the low-level mmc/sd controller ("host
> bridge") driver. You didn't say anything about what hardware is in
> use; I have no idea what driver to look at.
>
> -- Ian
>
>
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