Re: Apache segmentation fault when loading libphp7.so

Am 13.08.2020 um 15:28 schrieb Christoph M. Becker:
> On 13.08.2020 at 14:47, Kai Fürstenberg wrote:
> 
>> Am 13.08.2020 um 14:34 schrieb Christoph M. Becker:
>>
>>> On 13.08.2020 at 13:47, Kai Fürstenberg wrote:
>>>
>>>> Am 13.08.2020 um 12:53 schrieb Christoph M. Becker:
>>>>
>>>>> On 13.08.2020 at 11:52, Kai Fürstenberg wrote:
>>>>>
>>>>>> Am 13.08.2020 um 10:31 schrieb Christoph M. Becker:
>>>>>>
>>>>>>> On 12.08.2020 at 18:09, Kai Fürstenberg 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             __builtin_cpu_init();
>>>>>>>>
>>>>>>>> Before I had the fault
>>>>>>>>
>>>>>>>> #0  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=hidden -pthread
>>>>>> -D_REENTRANT  conftest.c -lm -ldl  -lpthread >&5
>>>>>> configure:13718: $? = 0
>>>>>> configure:13721: result: yes
>>>>>> configure:13741: checking for __builtin_cpu_supports
>>>>>> configure:13757: cc -o conftest -g -O2 -fvisibility=hidden -pthread
>>>>>> -D_REENTRANT  conftest.c -lm -ldl  -lpthread >&5
>>>>>> configure:13757: $? = 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.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>.
>>
>> 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 works.
> 
> For PHP 7.4, the relevant code has been moved to build/php.m4, where you
> could apply the patch manually.

found it, patched it, no success :-(

gdb sais during start:

(gdb) run -X -e debug -k start
Starting program: /usr/local/httpd-test/bin/httpd -X -e debug -k start
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[Thu Aug 13 16:37:33.167001 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module authn_file_module from
/usr/local/httpd-test/modules/mod_authn_file.so
[Thu Aug 13 16:37:33.172838 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module authn_core_module from
/usr/local/httpd-test/modules/mod_authn_core.so
[Thu Aug 13 16:37:33.180461 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module authz_host_module from
/usr/local/httpd-test/modules/mod_authz_host.so
[Thu Aug 13 16:37:33.188699 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module authz_groupfile_module from
/usr/local/httpd-test/modules/mod_authz_groupfile.so
[Thu Aug 13 16:37:33.192880 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module authz_user_module from
/usr/local/httpd-test/modules/mod_authz_user.so
[Thu Aug 13 16:37:33.198609 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module authz_core_module from
/usr/local/httpd-test/modules/mod_authz_core.so
[Thu Aug 13 16:37:33.203728 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module access_compat_module from
/usr/local/httpd-test/modules/mod_access_compat.so
[Thu Aug 13 16:37:33.209049 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module auth_basic_module from
/usr/local/httpd-test/modules/mod_auth_basic.so
[Thu Aug 13 16:37:33.214484 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module reqtimeout_module from
/usr/local/httpd-test/modules/mod_reqtimeout.so
[Thu Aug 13 16:37:33.219988 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module filter_module from
/usr/local/httpd-test/modules/mod_filter.so
[Thu Aug 13 16:37:33.225700 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module mime_module from
/usr/local/httpd-test/modules/mod_mime.so
[Thu Aug 13 16:37:33.233384 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module log_config_module from
/usr/local/httpd-test/modules/mod_log_config.so
[Thu Aug 13 16:37:33.238389 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module env_module from
/usr/local/httpd-test/modules/mod_env.so
[Thu Aug 13 16:37:33.244778 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module headers_module from
/usr/local/httpd-test/modules/mod_headers.so
[Thu Aug 13 16:37:33.250135 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module setenvif_module from
/usr/local/httpd-test/modules/mod_setenvif.so
[Thu Aug 13 16:37:33.254650 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module version_module from
/usr/local/httpd-test/modules/mod_version.so
[Thu Aug 13 16:37:33.259923 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module unixd_module from
/usr/local/httpd-test/modules/mod_unixd.so
[Thu Aug 13 16:37:33.266106 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module status_module from
/usr/local/httpd-test/modules/mod_status.so
[Thu Aug 13 16:37:33.272127 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module autoindex_module from
/usr/local/httpd-test/modules/mod_autoindex.so
[Thu Aug 13 16:37:33.276585 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module dir_module from
/usr/local/httpd-test/modules/mod_dir.so
[Thu Aug 13 16:37:33.282635 2020] [so:debug] [pid 25320:tid 3083007424]
mod_so.c(266): AH01575: loaded module alias_module from
/usr/local/httpd-test/modules/mod_alias.so

Program received signal SIGSEGV, Segmentation fault.
resolve_stripslashes () at
/usr/src/apache_testing/php-7.4.9/Zend/zend_cpuinfo.h:157
157             __builtin_cpu_init();



(gdb) bt
#0  resolve_stripslashes () at
/usr/src/apache_testing/php-7.4.9/Zend/zend_cpuinfo.h:157
#1  0xb7fe2aa2 in elf_machine_rel (skip_ifunc=<optimized out>,
reloc_addr_arg=<optimized out>, version=<optimized out>, sym=<optimized
out>, reloc=0xb6eabe48, map=0x4eaa40)
    at ../sysdeps/i386/dl-machine.h:353
#2  elf_dynamic_do_Rel (skip_ifunc=<optimized out>, lazy=<optimized
out>, nrelative=<optimized out>, relsize=<optimized out>,
reladdr=<optimized out>, map=<optimized out>)
    at do-rel.h:137
#3  _dl_relocate_object (scope=<optimized out>, reloc_mode=<optimized
out>, consider_profiling=<optimized out>) at dl-reloc.c:258
#4  0xb7fe9efa in dl_open_worker (a=<optimized out>) at dl-open.c:377
#5  0xb7da0a9c in __GI__dl_catch_exception (exception=<optimized out>,
operate=<optimized out>, args=<optimized out>) at dl-error-skeleton.c:196
#6  0xb7fe98fe in _dl_open (file=0x4db670
"/usr/local/httpd-test/modules/libphp7.so", mode=-2147483390,
caller_dlopen=0xb7ec6934 <apr_dso_load+36>, nsid=<optimized out>, argc=6,
    argv=0xbffffc14, env=0xbffffc30) at dl-open.c:599
#7  0xb7e4a2c8 in dlopen_doit (a=0xbffff4dc) at dlopen.c:66
#8  0xb7da0a9c in __GI__dl_catch_exception (exception=<optimized out>,
operate=<optimized out>, args=<optimized out>) at dl-error-skeleton.c:196
#9  0xb7da0b40 in __GI__dl_catch_error (objname=0x4df47c,
errstring=0x4df480, mallocedp=0x4df478, operate=0xb7e4a250
<dlopen_doit>, args=0xbffff4dc) at dl-error-skeleton.c:215
#10 0xb7e4aa71 in _dlerror_run (operate=0xb7e4a250 <dlopen_doit>,
args=0xbffff4dc) at dlerror.c:163
#11 0xb7e4a366 in __dlopen (file=0x4db670
"/usr/local/httpd-test/modules/libphp7.so", mode=258) at dlopen.c:87
#12 0xb7ec6934 in apr_dso_load (res_handle=0xbffff694, path=0x4db670
"/usr/local/httpd-test/modules/libphp7.so", pool=0x4b0218) at
dso/unix/dso.c:139
#13 0x0045d295 in dso_load (cmd=cmd@entry=0xbffff9fc,
modhandlep=modhandlep@entry=0xbffff694, filename=filename@entry=0x4e8a18
"modules/libphp7.so", used_filename=0xbffff69c)
    at mod_so.c:162
#14 0x0045d53a in load_module (cmd=0xbffff9fc, dummy=0xbffff93c,
modname=0x4e8a08 "php7_module", filename=0x4e8a18 "modules/libphp7.so")
at mod_so.c:263
#15 0x00449ff2 in invoke_cmd (cmd=<optimized out>,
parms=parms@entry=0xbffff9fc, mconfig=mconfig@entry=0xbffff93c,
args=<optimized out>) at config.c:895
#16 0x0044ac98 in execute_now (p=0xbffff984, ptemp=0xbffff988,
parent=<optimized out>, sub_tree=<optimized out>, parms=<optimized out>,
    args=0x4dad03 "php7_module        modules/libphp7.so",
cmd_line=<optimized out>) at config.c:1707
#17 ap_build_config_sub (p=p@entry=0x4b0218,
temp_pool=temp_pool@entry=0x4dabe8, l=<optimized out>, parms=<optimized
out>, current=<optimized out>, curr_parent=<optimized out>,
    conftree=<optimized out>) at config.c:1171
#18 0x0044cba2 in ap_build_config (parms=0xbffff9fc, p=0x4b0218,
temp_pool=0x4dabe8, conftree=0x4a6628 <ap_conftree>) at config.c:1428
#19 0x0044d342 in ap_process_resource_config (s=0x4d7930, fname=0x4dd990
"/usr/local/httpd-test/conf/httpd.conf", conftree=0x4a6628
<ap_conftree>, p=<optimized out>,
    ptemp=0x4dabe8) at config.c:1877
#20 0x0044e135 in ap_read_config (process=<optimized out>,
ptemp=<optimized out>, filename=<optimized out>, conftree=<optimized
out>) at config.c:2339
#21 0x00425c33 in main (argc=<optimized out>, argv=<optimized out>) at
main.c:659

Kai