Re: 2.6.0-test7 DEBUG_PAGEALLOC oops

[Manfred Spraul]

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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