Re: [uml-devel] fuzz tested 32 bit user mode linux image hangs in radix_tree_next_chunk()

[Richard Weinberger <richard@nod.at>]

Am 09.11.2013 20:07, schrieb Toralf FA?rster:
> On 11/06/2013 10:31 PM, Richard Weinberger wrote:
>> Am 06.11.2013 22:18, schrieb Toralf FA?rster:
>>> On 11/06/2013 05:06 PM, Konstantin Khlebnikov wrote:
>>>> In this case it must stop after scanning whole tree in line:
>>>> /* Overflow after ~0UL */
>>>> if (!index)
>>>>   return NULL;
>>>>
>>>
>>> A fresh current example with latest git tree shows that lines 769 and 770 do alternate :
>>
>> Can you please ask gdb for the value of offset?
>>
>> Thanks,
>> //richard
>>
> 
> Still trying to get those values. One attempt to do that was to replace -O2 with -O0 in the Makefile,
> but that resulted into this error :
> 
>   LD      kernel/built-in.o
>   CC      mm/memory.o
> In function a??zap_pmd_rangea??,
>     inlined from a??zap_pud_rangea?? at mm/memory.c:1265:8,
>     inlined from a??unmap_page_rangea?? at mm/memory.c:1290:8:
> mm/memory.c:1220:23: error: call to a??__compiletime_assert_1220a?? declared with attribute error: BUILD_BUG failed
> mm/memory.c: In function a??follow_page_maska??:
> mm/memory.c:1530:18: error: call to a??__compiletime_assert_1530a?? declared with attribute error: BUILD_BUG failed
> make[1]: *** [mm/memory.o] Error 1
> make: *** [mm] Error 2
> 
> 
> With -O1 it compiled at least.

You cannot build Linux with -O1/O0.
Try printing the value using printk...

Thanks,
//richard

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