[OE-core] gdb failure on simplest hello world program -- oe-selftest

[Khem Raj]

On 12/28/18 8:31 AM, richard.purdie at linuxfoundation.org wrote:
> On Fri, 2018-12-28 at 17:49 +0800, ChenQi wrote:
>> On 12/26/2018 07:06 PM, richard.purdie at linuxfoundation.org wrote:
>>> On Wed, 2018-12-26 at 10:09 +0800, ChenQi wrote:
>>>> Hi All,
>>>>
>>>> 'oe-selftest -r package.PackageTests.test_gdb_hardlink_debug'
>>>> fails.
>>>> I did the tests on both my Fedora27 and ubuntu16.04 servers. They
>>>> both
>>>> failed.
>>>> I can also reproduce this issue manually.
>>>>
>>>> I did some investigation. No clue how to fix this it. So I want
>>>> to seek
>>>> help from community.
>>>>
>>>> Below is some output from oe-selftest.
>>>> [snip]
>>>> 2018-12-26 09:27:58,440 - oe-selftest - INFO -
>>>> test_gdb_hardlink_debug
>>>> (package.PackageTests)
>>>> 2018-12-26 09:37:55,333 - oe-selftest - INFO - gdbtest
>>>> /usr/bin/hello1
>>>> 2018-12-26 09:37:59,904 - oe-selftest - ERROR - GDB result:
>>>> 1: Reading symbols from /usr/bin/hello1...Reading symbols from
>>>> /usr/bin/.debug/hello4...done.
>>>> done.
>>>> (gdb) Breakpoint 1 at 0x1060: file /usr/include/bits/stdio2.h,
>>>> line 107.
>>>> (gdb) Starting program: /usr/bin/hello1
>>>>
>>>> Breakpoint 1, main () at /usr/include/bits/stdio2.h:107
>>>> 107    /usr/include/bits/stdio2.h: No such file or directory.
>>>> (gdb) Continuing.
>>>> Hello World!
>>>> [Inferior 1 (process 312) exited normally]
>>>> (gdb)
>>>> 2018-12-26 09:38:00,907 - oe-selftest - INFO -  ... FAIL
>>>> [snip]
>>>>
>>>> The hello world problem is as follows.
>>>> $ cat
>>>> meta-selftest/recipes-test/selftest-hardlink/selftest-
>>>> hardlink/hello.c
>>>> #include <stdio.h>
>>>>
>>>> int main() {
>>>>       printf("Hello World!\n");
>>>> }
>>>>
>>>> Some extra information:
>>>> 1. Remove '-O2' or '-D_FORTIFY_SOURCE=2', and it works correctly.
>>>> 2. Adding some system call like daemon(0,0) before printf also
>>>> works.
>>>> 3. Reverting poky repo to
>>>> 1c048479af7cc98e30f9a33d1f3bef03711544aa,
>>>> which adds this selftest case, does not work. It still fails.
>>>> 4. Hongxu confirms that things work on his host.
>>>> 5. I also don't see failure about this test case on yocto's
>>>> autobuilder.
>>>>
>>>> Could somebody help to provide some suggestions?
>>>
>>> This is strange and there must be some difference between your
>>> configuration and what what we test on the autobuilder or on
>>> Hongxu's
>>> setup.
>>   
>> Hi Richard,
>>
>> I have talked with Hongxu and we can now both confirm that there does
>> exist some problem.
>>
>>> Which DISTRO and MACHINE are you using?
>>   
>> DISTRO is poky
>> MACHINE is qemux86.
>>
>> It seems that if MACHINE is qemux86-64, the test case could pass. But
>> that's just because the test case only checks 'Breakpoint 1, main ()
>> at hello.c:4'. See the console output below.
>> (gdb) b main
>> Breakpoint 1 at 0x1050: file /usr/include/bits/stdio2.h, line 107.
>> (gdb) r
>> Starting program: /usr/bin/hello1
>>
>> Breakpoint 1, main () at hello.c:4
>> 4        printf("Hello World!\n");
>> (gdb) c
>> Continuing.
>> Hello World!
>> [Inferior 1 (process 156) exited normally]
>> (gdb) q
>>
>> Even in this case, the 'b main' does not give correct result. The
>> test case passes because 'Breakpoint 1, main () at hello.c:4' is
>> there.
>>
>> On qemux86, we have:
>> (gdb) Breakpoint 1 at 0x1060: file /usr/include/bits/stdio2.h, line
>> 107.
>> (gdb) Starting program: /usr/bin/hello1
>>
>> Breakpoint 1, main () at /usr/include/bits/stdio2.h:107
>> 107    /usr/include/bits/stdio2.h: No such file or directory.
>> (gdb) Continuing.
>> Hello World!
>> [Inferior 1 (process 156) exited normally]
>> (gdb)
>>
>>> I think the key to resolving this is will be to understanding how
>>> to
>>> reproduce it...
>>   
>> Two ways to reproduce the problem:
>>
>> I) reproduce it via oe-selftest
>> 1) . oe-init-build-env build-selftest
>> 2) SANITY_TESTED_DISTROS = ""
>> 3) oe-selftest -r package.PackageTests.test_gdb_hardlink_debug
>>
>> II) reproduce it manually
>> 1) add meta-selftest to bblayers.conf
>> 2) IMAGE_INSTALL_append = " selftest-hardlink selftest-hardlink-dbg
>> selftest-hardlink-gdb"
>> 3) bitbake core-image-minimal
>> 4) On target:
>>       gdb /usr/bin/hello1
>>       (gdb) b main
> 
> I confirmed I could also reproduce it. We've just been lucky with the
> configuration the autobuilder tests.
> 
> I think we need to improve the test case. Does installing the libc
> headers/dev package so that stdio2.h is there help?

This is not exported API so libc headers may not work but installing 
libc dev package should help here.

> 
> Cheers,
> 
> Richard
>