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[2010-10-12 12:20 UTC] martynas at venck dot us
Description:
------------
Setting zlib.output_compression to On in .htaccess leads to
frequent Segmentation faults.
I've managed to get full backtraces:
Program terminated with signal 11, Segmentation fault.
#0 0x000000000084c7a1 in zend_hash_copy (target=0x19562138,
source=0x19566258, pCopyConstructor=0x83d7b7
<zval_add_ref>,
tmp=0x7fffaabe9ee0, size=8)
at /usr/local/src/php-5.2.14/Zend/zend_hash.c:785
785 if (p->nKeyLength) {
(gdb) bt
#0 0x000000000084c7a1 in zend_hash_copy (target=0x19562138,
source=0x19566258, pCopyConstructor=0x83d7b7
<zval_add_ref>,
tmp=0x7fffaabe9ee0, size=8)
at /usr/local/src/php-5.2.14/Zend/zend_hash.c:785
#1 0x000000000083d8ad in _zval_copy_ctor_func
(zvalue=0x19562110)
at /usr/local/src/php-5.2.14/Zend/zend_variables.c:133
#2 0x00000000008be28f in _zval_copy_ctor
(zvalue=0x19562110)
at /usr/local/src/php-5.2.14/Zend/zend_variables.h:45
#3 0x00000000008be07e in
cgi_php_import_environment_variables (
array_ptr=0x19562110) at /usr/local/src/php-
5.2.14/sapi/cgi/cgi_main.c:586
#4 0x00000000008be2aa in sapi_cgi_register_variables (
track_vars_array=0x19562110)
at /usr/local/src/php-5.2.14/sapi/cgi/cgi_main.c:635
#5 0x00000000007fd40e in php_register_server_variables ()
at /usr/local/src/php-5.2.14/main/php_variables.c:577
#6 0x00000000007fd4ef in php_auto_globals_create_server (
name=0x19213ba0 "_SERVER", name_len=7)
at /usr/local/src/php-5.2.14/main/php_variables.c:768
#7 0x000000000082d414 in zend_is_auto_global (name=0x92f475
"_SERVER",
name_len=7) at /usr/local/src/php-
5.2.14/Zend/zend_compile.c:4162
#8 0x00000000004cee64 in php_enable_output_compression
(buffer_size=16386)
at /usr/local/src/php-5.2.14/ext/zlib/zlib.c:1029
#9 0x00000000004cf089 in php_zlib_output_compression_start
()
---Type <return> to continue, or q <return> to quit---
at /usr/local/src/php-5.2.14/ext/zlib/zlib.c:1068
#10 0x00000000004ccb20 in OnUpdate_zlib_output_compression
(entry=0x192aa4b0,
new_value=0x195620f0 "16386", new_value_length=5,
mh_arg1=0x88,
mh_arg2=0xe30380, mh_arg3=0x0, stage=16)
at /usr/local/src/php-5.2.14/ext/zlib/zlib.c:210
#11 0x0000000000855367 in zend_alter_ini_entry_ex (
name=0x1976aac0 "zlib.output_compression",
name_length=24,
new_value=0x195921f0 "16386", new_value_length=5,
modify_type=2, stage=16,
force_change=0) at /usr/local/src/php-
5.2.14/Zend/zend_ini.c:293
#12 0x00000000008551b8 in zend_alter_ini_entry (
name=0x1976aac0 "zlib.output_compression",
name_length=24,
new_value=0x195921f0 "16386", new_value_length=5,
modify_type=2, stage=16)
at /usr/local/src/php-5.2.14/Zend/zend_ini.c:248
#13 0x00002b2e4c125029 in sapi_cgi_activate ()
from /usr/local/lib/php/extensions/htscanner.so
#14 0x00000000007f5ebd in sapi_activate ()
at /usr/local/src/php-5.2.14/main/SAPI.c:389
#15 0x00000000007ebb00 in php_request_startup ()
at /usr/local/src/php-5.2.14/main/main.c:1284
#16 0x00000000008c05b6 in main (argc=3, argv=0x7fffaabef1a8)
at /usr/local/src/php-5.2.14/sapi/cgi/cgi_main.c:1910
Perhaps htscanner should call zend_alter_ini_entry w/
PHP_INI_STAGE_HTACCESS, since _SERVER appears not to be
setup during php_enable_output_compression call?
Reproduce code:
---------------
php_flag zlib.output_compression on
Expected result:
----------------
Pages being served.
Actual result:
--------------
Segmentation fault.
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Last updated: Mon Oct 27 09:00:02 2025 UTC |
I'm attaching a working patch below. At the point where zend_alter_ini_entry calls are made, Zend engine is not initialized yet; therefore--we have to do the calls in PHP_INI_STAGE_HTACCESS stage. See main/main.c--sapi_activate call comes before zend_startup and environment calls. Segmentation faults are now gone. Index: htscanner.c ============================================================ ======= --- htscanner.c (revision 303747) +++ htscanner.c (working copy) @@ -162,7 +162,7 @@ } } #endif - if (zend_alter_ini_entry(name, name_len + 1, value, value_len, mode, PHP_INI_STAGE_RUNTIME) == FAILURE) { + if (zend_alter_ini_entry(name, name_len + 1, value, value_len, mode, PHP_INI_STAGE_HTACCESS) == FAILURE) { if (HTG(verbose)) { zend_error(E_WARNING, "Adding option (Name: %s Value: %s) (%i, %i) failed!\n", name, value, name_len, value_len); } @@ -427,7 +427,7 @@ while (SUCCESS == zend_hash_get_current_data_ex(entry_fetched->ini_entries, (void**)&value, &pos)) { zend_hash_get_current_key_ex(entry_fetched->ini_entries, &name, &len, &num, 0, &pos); - if (zend_alter_ini_entry(name, len, value, strlen(value), PHP_INI_PERDIR, PHP_INI_STAGE_RUNTIME) == FAILURE) { + if (zend_alter_ini_entry(name, len, value, strlen(value), PHP_INI_PERDIR, PHP_INI_STAGE_HTACCESS) == FAILURE) { char msg[1024]; htscannerMutexUnlock(ini_entries_cache_mutex); snprintf(msg, sizeof (msg), "Adding option from cache (Name: '%s' Value: '%s') failed!\n", name, value);