Re: Apache segmentation fault when loading libphp7.so

Am 13.08.2020 um 10:20 schrieb Keith Roberts:
> Could this be a bug in the PHP code:
>=20
> https://bugs.php.net/bug.php?id=3D78769
>=20
> Is __builtin_cpu_init part of PHP source code and what does=20
> __builtin_cpu_init function do?
>=20
> Is it trying to check for some CPU flags that are not existent on your =

> particular CPU?

AFAIK __builtin_cpu_init is a function of gcc.

I don't know what it does. PHP uses this function from 7.3.

The bug could fit. I will check and try to compile on a different
machine with Buster and see if the error is reproduceable.

Kai


>=20
> Keith
>=20
> On 13/08/2020 09:03, Kai F=C3=BCrstenberg wrote:
>> Am 12.08.2020 um 22:54 schrieb Keith Roberts:
>>> Hi Kai,
>>>
>>> Have you uninstalled the debian default distro versions of httpd and =
PHP
>>> as well?
>>>
>>> I have had issues when compiling apache and PHP with the distro versi=
ons
>>> installed.
>>>
>>> They don't always work well side by side.
>> Hi Keith,
>>
>> I never installed them. The initial installation was a minimal one and=
 I
>> always compiled these programs from source.
>>
>> But I re-checked and I have no distro versions of them.
>>
>> While checking distro or old versions of programs, I deleted any older=

>> version of gcc (in case of some lib confusion), but no change.
>>
>> I also checked the source code of PHP: The function __builtin_cpu_init=

>> was first used in the 7.3 versions, which explaines why I am not able =
to
>> use any newer version as 7.2.x atm. In 7.2.33 this function is not use=
d.
>>
>> Kai
>>
>>
>>> Keith
>>>
>>> On 12/08/2020 17:09, 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...
>>>>
>>>> Kai
>>>>
>>>>
>>>>
>>>>
>>>> Am 11.08.2020 um 20:24 schrieb [email protected]:
>>>>> Hi Keith,
>>>>>
>>>>> Am 11.08.2020 um 16:51 schrieb Keith Roberts:
>>>>>> You could try logging PHP startup errors:
>>>>>>
>>>>>> https://www.php.net/manual/en/errorfunc.configuration.php#ini.disp=
lay-startup-errors
>>>>>
>>>>>
>>>>> this did not work. I have nothing on my screen or in any log.
>>>>> php -i sais I used the correct php.ini
>>>>>
>>>>>> Or try running Apache daemon using valgrind:
>>>>>>
>>>>>> https://www.valgrind.org/docs/manual/quick-start.html
>>>>> This was REALLY strange. I don't know if this is expected behaviour=
,
>>>>> but using valgrind, the server is up and running.
>>>>>
>>>>> I created a full output, ...
>>>>>
>>>>> (valgrind --leak-check=3Dfull --show-leak-kinds=3Dall -v
>>>>> /usr/local/httpd-test/bin/httpd -k start)
>>>>>
>>>>> ... which you can find here:
>>>>> https://pastebin.com/Dwgjxjgj
>>>>>
>>>>> Greets
>>>>> Kai
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> HTH
>>>>>>
>>>>>> Keith
>>>>>>
>>>>>> On 11/08/2020 13:54, Kai F=C3=BCrstenberg wrote:
>>>>>>> Hello Keith,
>>>>>>>
>>>>>>> no, it's not mod_alias, because debug log sais the module is load=
ed.
>>>>>>> Without mod_alias it looks like below.
>>>>>>>
>>>>>>> When I comment out phplib7.so, the server starts and is online.
>>>>>>>
>>>>>>> I don't know if it helps: httpd sends a return code 139.
>>>>>>> PHP in the CLI works.
>>>>>>>
>>>>>>>
>>>>>>> [Tue Aug 11 14:49:21.635494 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module authn_file_module from
>>>>>>> /usr/local/httpd-test/modules/mod_authn_file.so
>>>>>>> [Tue Aug 11 14:49:21.635606 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module authn_core_module from
>>>>>>> /usr/local/httpd-test/modules/mod_authn_core.so
>>>>>>> [Tue Aug 11 14:49:21.635688 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module authz_host_module from
>>>>>>> /usr/local/httpd-test/modules/mod_authz_host.so
>>>>>>> [Tue Aug 11 14:49:21.635796 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module authz_groupfile_module from=

>>>>>>> /usr/local/httpd-test/modules/mod_authz_groupfile.so
>>>>>>> [Tue Aug 11 14:49:21.635874 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module authz_user_module from
>>>>>>> /usr/local/httpd-test/modules/mod_authz_user.so
>>>>>>> [Tue Aug 11 14:49:21.666338 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module authz_core_module from
>>>>>>> /usr/local/httpd-test/modules/mod_authz_core.so
>>>>>>> [Tue Aug 11 14:49:21.666433 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module access_compat_module from
>>>>>>> /usr/local/httpd-test/modules/mod_access_compat.so
>>>>>>> [Tue Aug 11 14:49:21.666522 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module auth_basic_module from
>>>>>>> /usr/local/httpd-test/modules/mod_auth_basic.so
>>>>>>> [Tue Aug 11 14:49:21.666617 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module reqtimeout_module from
>>>>>>> /usr/local/httpd-test/modules/mod_reqtimeout.so
>>>>>>> [Tue Aug 11 14:49:21.666713 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module filter_module from
>>>>>>> /usr/local/httpd-test/modules/mod_filter.so
>>>>>>> [Tue Aug 11 14:49:21.666805 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module mime_module from
>>>>>>> /usr/local/httpd-test/modules/mod_mime.so
>>>>>>> [Tue Aug 11 14:49:21.666907 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module log_config_module from
>>>>>>> /usr/local/httpd-test/modules/mod_log_config.so
>>>>>>> [Tue Aug 11 14:49:21.666999 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module env_module from
>>>>>>> /usr/local/httpd-test/modules/mod_env.so
>>>>>>> [Tue Aug 11 14:49:21.667102 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module headers_module from
>>>>>>> /usr/local/httpd-test/modules/mod_headers.so
>>>>>>> [Tue Aug 11 14:49:21.667195 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module setenvif_module from
>>>>>>> /usr/local/httpd-test/modules/mod_setenvif.so
>>>>>>> [Tue Aug 11 14:49:21.667298 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module version_module from
>>>>>>> /usr/local/httpd-test/modules/mod_version.so
>>>>>>> [Tue Aug 11 14:49:21.667395 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module unixd_module from
>>>>>>> /usr/local/httpd-test/modules/mod_unixd.so
>>>>>>> [Tue Aug 11 14:49:21.667484 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module status_module from
>>>>>>> /usr/local/httpd-test/modules/mod_status.so
>>>>>>> [Tue Aug 11 14:49:21.667588 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module autoindex_module from
>>>>>>> /usr/local/httpd-test/modules/mod_autoindex.so
>>>>>>> [Tue Aug 11 14:49:21.667680 2020] [so:debug] [pid 25863:tid
>>>>>>> 3082425792]
>>>>>>> mod_so.c(266): AH01575: loaded module dir_module from
>>>>>>> /usr/local/httpd-test/modules/mod_dir.so
>>>>>>> Speicherzugriffsfehler
>>>>>>>
>>>>>>> Kai
>>>>>>>
>>>>>>>
>>>>>>> Am 11.08.2020 um 14:05 schrieb Keith Roberts:
>>>>>>>> Hi Kai,
>>>>>>>>
>>>>>>>> Is it seg faulting when the mod_alias mod is loaded?
>>>>>>>>
>>>>>>>> Can you try to run apache and PHP module without the mod_alias
>>>>>>>> module to
>>>>>>>> see if it happens then?
>>>>>>>>
>>>>>>>> Kind Regards,
>>>>>>>>
>>>>>>>> Keith Roberts
>>>>>>>>
>>>>>>>> On 11/08/2020 11:21, Kai F=C3=BCrstenberg wrote:
>>>>>>>>> /usr/local/httpd-test/modules/mod_dir.so
>>>>>>>>> [Tue Aug 11 12:04:48.058215 2020] [so:debug] [pid 24664:tid
>>>>>>>>> 3083007424]
>>>>>>>>> mod_so.c(266): AH01575: loaded module alias_module from
>>>>>>>>> /usr/local/httpd-test/modules/mod_alias.so
>>>>>>>>> Speicherzugriffsfehler
>>>>>>>>>
>>>>>>>>> "Speicherzugrifftsfehler" =3D "Segmentation fault"