在 2015/10/29 23:09, Will Deacon 写道:
> On Thu, Oct 29, 2015 at 09:35:42PM +0800, kbuild test robot wrote:
>> [auto build test ERROR on arm64/for-next/core -- if it's inappropriate base,
>> please suggest rules for selecting the more suitable base]
>>
>> url:
>> https://github.com/0day-ci/linux/commits/Li-Bin/recordmcount-arm64-replace-the-ignored-mcount-call-into-nop/20151028-160846
>> config: arm64-allmodconfig (attached as .config)
>> reproduce:
>> wget
>> https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross
>> -O ~/bin/make.cross
>> chmod +x ~/bin/make.cross
>> # save the attached .config to linux build tree
>> make.cross ARCH=arm64
>>
>> All errors (new ones prefixed by >>):
>>
>>>> /bin/bash: line 1: 117734 Segmentation fault ./scripts/recordmcount
>>>> "arch/arm64/kernel/traps.o"
>> --
>>>> /bin/bash: line 1: 113824 Segmentation fault ./scripts/recordmcount
>>>> "arch/arm64/mm/fault.o"
>
> I can reproduce this locally with an allmodconfig build. The offset
> parameter to make_nop_arm64 is nuts:
>
> Program received signal SIGSEGV, Segmentation fault.
> make_nop_arm64 (map=0x7ffff7fef000, offset=2600547309829750784) at
> scripts/recordmcount.c:170
> 170 if (*ptr != 0x94000000)
>
> Both shdr->sh_offset (0x17000000000000) and relp->r_offset
> (0x2400000000000000)
> look dodgy in the caller.
>
The allmodconfig configs the CONFIG_CPU_BIG_ENDIAN, and the test system is
little eddian, so
it triggers the error.
It is a bug in nop_mcount:
...
if (mcountsym == Elf_r_sym(relp) && !is_fake_mcount(relp)) {
if (make_nop) {
ret = make_nop((void *)ehdr, shdr->sh_offset + relp->r_offset);
}
...
shdr->sh_offset and welp->r_offset should handle endianness properly as
_w(shdr->sh_offset)/
_w(relp->r_offset). I will post a patchset including this patch soon.
Thanks,
Li Bin
> Li, can you take a look please?
>
> Will
>
> .
>
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