Re: 2.6.19-rc3: known unfixed regressions (v3)

Jun'ichi Nomura
2006-10-30T17:22:34Z

Hi Michael,

Michael S. Tsirkin wrote:
>> The code is related to bd_claim_by_disk which is called when
>> device-mapper or md tries to mark the underlying devices
>> for exclusive use and creates symlinks from/to the devices
>> in sysfs. The patch added error handlings which weren't in
>> the original code.
>>
>> I have no idea how it affects ACPI event handling.
>
> It's a mystery. Probably exposes a bug somewhere?
>
>> Are you using dm and/or md on your machine?
>
> The .config is attached to bugzilla.

OK, I found you disabled CONFIG_MD, which means neither
dm.ko nor md.ko was built.
Do you have any out-of-tree kernel modules which call either
bd_claim_by_kobject or bd_claim_by_disk?

If you aren't using either of them, I'm afraid reverting
the patch doesn't really solve your problem because the patched
code is called only from them.

>> Have you seen any unusual kernel messages or symptoms regarding
>> dm/md before the ACPI problem occurs?
>
> I haven't.

Thanks,
--
Jun'ichi Nomura, NEC Corporation of America