On 09/22/2014 09:49 PM, Sam Hajian wrote:
>> As a general rule, turning debug options off to make bugs disappear is
>> not really a good option, the sooner you catch a bug the better. Anyway,
> I seems I was not clear, I said I tried 2 scenarios. I initially tried
> IPIPE & LPAE and there was a null pointer dereference, as shown in the
> log.
>
> [ 7.132601] Unable to handle kernel NULL pointer dereference at
> virtual address 00000000
> [ 7.149256] pgd = c0003000, hw pgd = c0003000
> [ 7.158295] [00000000] *pgd=80000080004003, *pmd=00000000
> [ 7.169475] Internal error: Oops: 206 [#1] SMP ARM
>
> When I traced it, found that in debug code which is set by
> CONFIG_SLUB_DEBUG. to confirm that when I had this flag off the null
> pointer dereference was gone. But ran into other problem with invalid
> paging request.
How is that different to what I said? You turned off a debug option
(CONFIG_SLUB_DEBUG) and made a bug disappear.
--
Gilles.
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