Date: Mon, 08 Nov 2021 11:37:22 +0100 From: Oskar Holmlund <info@ohdata.se> To: kamalpr@gmail.com Cc: freebsd-arm <freebsd-arm@freebsd.org>, owner-freebsd-arm@freebsd.org Subject: Re: bug in mmc driver Message-ID: <26c5cec49c59d7a5b1d5f53c48791d61@ohdata.se> In-Reply-To: <CAK=yUGLqcK96ZKh9DAccp19Xoq7gkaz7vK0fPeUHE3sTwRaWbQ@mail.gmail.com> References: <CAK=yUG%2Bu9K3=9yHKeabBkyKx%2B6=mGy3_cKXaJeTa75OQ%2BbTJYg@mail.gmail.com> <22fb38d9b6cda8baec08713159bb65afcc8cd418.camel@freebsd.org> <CAK=yUGLqcK96ZKh9DAccp19Xoq7gkaz7vK0fPeUHE3sTwRaWbQ@mail.gmail.com>
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2021-11-01 08:25 skrev Kamal R. Prasad:
> 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
>>
>>
Hi Kamal,
Can you add your bugreport to
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255289
Please, share your script and maybe some more details about your
hardware.
--
Bästa Hälsningar
Oskar Holmlund
Tel 070-3220292
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