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SubjectRe: 2.6.0-test7 DEBUG_PAGEALLOC oops
Mike wrote:

>Unable to handle kernel paging request at virtual address c034a000
> printing eip:
>c0134d5a
>*pde = 00102027
>*pte = 0034a000
>
Fault trying to read from address 0xc034a000: the page is not mapped.

>Oops: 0000 [#1]
>CPU: 0
>EIP: 0060:[<c0134d5a>] Not tainted
>EFLAGS: 00010002
>EIP is at store_stackinfo+0x4e/0x80
>
In store_stackinfo: the function stores a backtrace of the last
kmem_cache_free caller in the object - might be useful, and the memory
is not used.

>eax: 00000000 ebx: c7802f98 ecx: c0301390 edx: c030138c
>esi: c0349ffe edi: 017e0008 ebp: c0349da6 esp: c0349d96
>ds: 007b es: 007b ss: 0068
>Process swapper (pid: 0, threadinfo=c0348000 task=c02fcbe0)
>
The esp value is sane, the stack is at 0xc0348000, and the fault is at
'a000: just behind the end of the stack.
I assume the fauling line is
svalue = *sptr++;

It looks like store stackinfo accesses memory behind the end of the stack.
Which gcc version do you use? Could you send me mm/slab.o?

--
Manfred

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