libbsd: "swi6: Giant task queue" suspend if removing SD Card

RUI Zhengxin ruizx at
Sun Jan 10 05:38:55 UTC 2021

Hi Chris & Christian,
Thanks for your help.
In our application, shell is very useful for testing and debuging.
We want to avoid shell hang when sd card is removed unexpected.
Current workaround solution we used is ti_sdhci_get_card_present get the sd removing flag but it always return true.
The uplayer application get the flag and not access the sd card again.

Best regards.
At 2021-01-08 07:19:11, "Chris Johns" <chrisj at> wrote:
>On 8/1/21 1:10 am, Christian Mauderer wrote:
>> Hello RUI Zhengxin,
>> On 07/01/2021 04:43, RUI Zhengxin wrote:
>>> Hi all,
>>> We find "swi6: Giant task queue" suspend if removing SD Card.
>>> libbsd5.1 is running at beagle bone hardware, the sdhci driver is attached
>>> success.
>>> *sdhci_ti0: <TI MMCHS (SDHCI 2.0)> mem 0x4809c000-0x4809c3ff irq 78,4 on
>>> simplebus0*
>>> *mmc0: <MMC/SD bus> on sdhci_ti0*
>>> The console show the message when removing sd card
>>> *emerg: mmcsd_detach: FIXME*
>> Like the message suggests: Removing SD cards is currently not implemented. The
>> part of the subsystem is just removed and replaced by a BSD_PANIC("FIXME"). It's
>> a bit back since I last touched that subsystem but if I remember correctly, it
>> would be quite a bit of work to add that support.
>I have added VFS support to libbsd but I have not looked at this specific set of
>interfaces. I have left them alone for now. Once my changes are merged and
>stable it would be interesting to see if the devfs and related pieces can be
>reverted back to something closer to the original FreeBSD sources and if it
>helps in this case.
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