Re: Apache segmentation fault when loading libphp7.so

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 s=
ome
>>>>> 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 wo=
rth
>>>> 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-L3=
278>
>>>
>>> config.log:
>>> configure:13702: checking for __builtin_cpu_init
>>> configure:13718: cc -o conftest -g -O2 -fvisibility=3Dhidden -pthread
>>> -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 -pthread
>>> -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 t=
o
>> 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.m4
> (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>.

=2D-
Christoph M. Becker