Re: [LTP] Posix test case mmap/31-1 fails on Linux/eglibc

Yasuaki Ishimatsu
2012-01-04T02:50:23Z

Hi Gao,

2012/01/04 11:05, Wanlong Gao wrote:
> On 01/04/2012 09:37 AM, Yasuaki Ishimatsu wrote:
>
>> Hi Kai,
>>
>> 2011/12/28 19:55, Kang Kai wrote:
>>> Hi all,
>>>
>>> I run mmap/31-1 failed with ENOMEM on linux, with error message:
>>> off: fffffffffffff000, len: fffffffffffff000
>>> Test FAIL: expect EOVERFLOW but get other error: Cannot allocate memory
>>>
>>> But compare to mmap/24-2, it mmap() the same length but pass. Its output:
>>> available memory: 18446744073709551615
>>> addr: 7f78c54fa000, len: ffffffffffffffff
>>> addr: 7f78c54fa000, len: fffffffffffff000
>>> Test Pass: mmap/24-2.c Get ENOMEM: Cannot allocate memory
>>>
>>> So I suppose that mmap/31-1 may need update, but I don't know how to
>>> make mmap() overflow as expect.
>>> Any suggestion is appreciated.
>>
>> I don't think mmap/31-1 need update since it is Linux Kernel's problem,
>> not the test's problem. The problem is being discussed on LKML.
>>
>> https://lkml.org/lkml/2011/12/22/85
>
>
> But it seems that the patch was not acceptable.

As you say, it has not been accepted yet.
But I think Linux will be fixed to return EOVERFLOW in mmap/31-1's test
in the near future.

Regards,
Yasuaki Ishimatsu

>
> Thanks
> -Wanlong Gao
>
>>
>> Regards,
>> Yasuaki Ishimatsu
>>
>>>
>>> Regards,
>>> Kai