Re: Removing an SDHC card causes a kernel panic on -current

On 06/26/12 22:29, Kenneth D. Merry wrote:
> On Tue, Jun 26, 2012 at 19:41:07 -0400, Benjamin Kaduk wrote:
>> On Tue, 26 Jun 2012, Michael Butler wrote:
>>
>>> As follows, in "g_disk_providergone", a NULL pointer reference?:
>>
>> g_disk_providergone() is new in r237518 (by ken); ken cc'd.
> 
> Can you try the attached patch to sys/geom/geom_disk.c?

This fixes the panic :-)

> 
> Also, do you have full dmesg information for when the panic happened?
> 
> It looks like disk_destroy() has already been called in this case, and I
> suppose that's likely to happen for any of the users of the GEOM disk class
> that haven't been updated with the reference count changes I made in da(4).
> (i.e. all of the rest of them.)
> 
> Let me know whether this works for you.

All I have is the following leading up to my removal of the card (and
the restart afterwards):

Jun 26 08:57:11 toshi kernel: sdhci0-slot0: Card inserted
Jun 26 08:57:11 toshi kernel: mmc0: <MMC/SD bus> on sdhci0
Jun 26 08:57:11 toshi kernel: mmc0: Probing bus
Jun 26 08:57:11 toshi kernel: mmc0: SD probe: OK (OCR: 0x00ff8000)
Jun 26 08:57:11 toshi kernel: mmc0: Current OCR: 0x00ff8000
Jun 26 08:57:11 toshi kernel: mmc0: Probing cards
Jun 26 08:57:11 toshi kernel: mmc0: New card detected (CID
03534453553136478080d4290400a300)
Jun 26 08:57:11 toshi kernel: mmc0: New card detected (CSD
400e00325b59000076b27f800a404000)
Jun 26 08:57:11 toshi kernel: mmc0: Card at relative address 36832 added:
Jun 26 08:57:11 toshi kernel: mmc0:  card: SDHC SU16G 8.0 SN -2133579516
MFG 03/2010 by 3 SD
Jun 26 08:57:11 toshi kernel: mmc0:  bus: 4bit, 50MHz, high speed timing
Jun 26 08:57:11 toshi kernel: mmc0:  memory: 31116288 blocks, erase
sector 8192 blocks
Jun 26 08:57:12 toshi kernel: mmc0: setting transfer rate to 25.000MHz
Jun 26 08:57:12 toshi kernel: mmcsd0: 14GB <SDHC SU16G 8.0 SN
-2133579516 MFG 03/2010 by 3 SD> at mmc0 24.0MHz/4bit/65535-block
Jun 26 08:57:12 toshi kernel: GEOM: new disk mmcsd0
Jun 26 08:57:12 toshi kernel: mmc0: setting bus width to 4 bits

Jun 26 08:58:44 toshi syslogd: kernel boot file is /boot/kernel/kernel
Jun 26 08:58:44 toshi kernel: Copyright (c) 1992-2012 The FreeBSD Project.
Jun 26 08:58:44 toshi kernel: Copyright (c) 1979, 1980, 1983, 1986,
1988, 1989, 1991, 1992, 1993, 1994
Jun 26 08:58:44 toshi kernel: The Regents of the University of
California. All rights reserved.
Jun 26 08:58:44 toshi kernel: FreeBSD is a registered trademark of The
FreeBSD Foundation.