> On 9/27/07, Tejun Heo <htejun@gmail.com> wrote:
>> Tejun Heo wrote:
>>> Torsten Kaiser wrote:
>>>> Comparing the driver/ata directory from rc3-mm1 and rc4-mm1 the
>>>> following change looked the most suspicions to me:
>>>>
http://git.kernel.org/?p=linux/kernel/git/jgarzik/libata-dev.git;a=blobdiff;f=drivers/...
>>>>
>>>> That after rc4-mm1 the sata_sil24.c did not change anymore also
>>>> matches the occurrence of the error.
>>>>
>>>> To confirm my theorie I exchanged the sata_sil24.c from rc8-mm1 with
>>>> the version from rc3-mm1.
>>>> I was able to boot the resulting kernel successfully 5 times, without
>>>> the error happening again.
>>> Thanks a lot for chasing down the problem. The changed code is address
>>> initialization path and it's weird that it causes intermittent failures,
>>> not a consistent one.
>>>
>>> Anyways, does the attached patch fix the problem?
>
> I'm starting to *really* hate that bug.
> My analysis was wrong, as I booted to modified 2.6.23-rc8-mm1 this
> morning, that failed too. (Same error messages as -rc7-mm1 from the
> first mail in this thread.)
> So it's not that change that causes the breakage.
>
> And I'm not really finding a good pattern to what boots fail and what work.
> It seems to only fail, if I completely power off the system for
> several hours. (Using the physical switch at the backside of the
> powersupply, not the normal soft-off)
>
> One of the five boots I tried yesterday, I also powered the system
> completely off that way, but only leaving it off ~10..20 seconds
> seemed not to trigger the bug.
>
> But I still think that is not a hardware failure, as the -rc3-mm1
> kernel never showed that error, even when I used it several times
> after the first -rc4-mm1 failures.
>
>> If not, can you add printk of iomap[SIL24_PORT_BAR], offset, initialized
>> cmd_addr and scr_addr in the loop and see whether anything is different
>> between when the driver works and fails.
>
> Should I do this anyway?
>
> I compared the dmesg form good and bad boots with -rc7-mm1 but could
> not see any difference, so do you think that these additional
> diagnostics could show a difference?
> Or could you suggest any other debugging options I should try?
