Re: Apache segmentation fault when loading libphp7.so

On 13.08.2020 at 14:47, Kai F=C3=BCrstenberg wrote:

> Am 13.08.2020 um 14:34 schrieb Christoph M. Becker:
>
>> On 13.08.2020 at 13:47, Kai F=C3=BCrstenberg wrote:
>>
>>> Am 13.08.2020 um 12:53 schrieb Christoph M. Becker:
>>>
>>>> On 13.08.2020 at 11:52, Kai F=C3=BCrstenberg wrote:
>>>>
>>>>> Am 13.08.2020 um 10:31 schrieb Christoph M. Becker:
>>>>>
>>>>>> On 12.08.2020 at 18:09, Kai F=C3=BCrstenberg wrote:
>>>>>>
>>>>>>> Hello everybody,
>>>>>>>
>>>>>>> and thank you for you help so far.
>>>>>>>
>>>>>>> I played around with gdb a little bit.
>>>>>>>
>>>>>>> I re-configured php the way I did in 7.2 (just with some slight
>>>>>>> modifications), to use mysql, gd and some other things.
>>>>>>>
>>>>>>> But this time, httpd stops with
>>>>>>>
>>>>>>> Program received signal SIGSEGV, Segmentation fault.
>>>>>>> resolve_stripslashes () at
>>>>>>> /usr/src/apache_testing/php-7.4.9/Zend/zend_cpuinfo.h:157
>>>>>>> 157=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 __builtin_cpu_init();
>>>>>>>
>>>>>>> Before I had the fault
>>>>>>>
>>>>>>> #0=C2=A0 resolve_base64_decode () at
>>>>>>> /usr/src/apache_testing/php-7.4.9/Zend/zend_cpuinfo.h:141
>>>>>>>
>>>>>>> Line 141 of zend_cpuinfo.h is the very same command
>>>>>>> __builtin_cpu_init()
>>>>>>>
>>>>>>> It seems, that exactly this command __builtin_cpu_init() fails for=
 some
>>>>>>> reason...
>>>>>>
>>>>>> Did you check config.log?  There is a test for __builtin_cpu_init()
>>>>>> availability[1] which apparently succeeds on your system, but it's =
worth
>>>>>> to actually look that up in config.log.  Maybe this test should use
>>>>>> AC_RUN_IFELSE instead of AC_LINK_IFELSE (and have the then and else
>>>>>> branch of the ternary operator swapped)?
>>>>>>
>>>>>> [1]
>>>>>> <https://github.com/php/php-src/blob/php-7.3.21/acinclude.m4#L3261-=
L3278>
>>>>>
>>>>> config.log:
>>>>> configure:13702: checking for __builtin_cpu_init
>>>>> configure:13718: cc -o conftest -g -O2 -fvisibility=3Dhidden -pthrea=
d
>>>>> -D_REENTRANT  conftest.c -lm -ldl  -lpthread >&5
>>>>> configure:13718: $? =3D 0
>>>>> configure:13721: result: yes
>>>>> configure:13741: checking for __builtin_cpu_supports
>>>>> configure:13757: cc -o conftest -g -O2 -fvisibility=3Dhidden -pthrea=
d
>>>>> -D_REENTRANT  conftest.c -lm -ldl  -lpthread >&5
>>>>> configure:13757: $? =3D 0
>>>>> configure:13760: result: yes
>>>>>
>>>>> I just don't understand what you mean with the link...
>>>>
>>>> I basically suggested to apply
>>>> <https://gist.github.com/cmb69/3fd0106ce78446c9e10e54eec21a4d82>, and=
 to
>>>> run ./configure again.  Would the result still be "yes"?
>>>
>>> OK, so far so good.
>>>
>>> I just wonder, which file you want me to patch, because my acinclude.m=
4
>>> (in Zend subfolder, v7.3) only has about 200 lines (the mentioned part
>>> is missing in this file) and in 7.4 this file is completely missing...
>>
>> The patch is about acinclude.m4 in the toplevel folder:
>> <https://github.com/php/php-src/blob/php-7.3.21/acinclude.m4>.
>
> This file is not available in 7.4. In 7.3 it's there, but not 7.4.
> I can try 7.3 with your patch. Just gimme some time and see if this work=
s.

For PHP 7.4, the relevant code has been moved to build/php.m4, where you
could apply the patch manually.

=2D-
Christoph M. Becker