Re: Apache segmentation fault when loading libphp7.so

Hello Christoph and Keith, as the apache module is still not starting, I have accepted a suggestion from the httpd mailing list to try php-fpm instead. This now works great and I have already transferred it from testing to production. Thank you for your help. Kai Am 13.08.2020 um 16:40 schrieb Kai Fürstenberg: > 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 >