应用错误收集

我们有一个64位的Web服务器，内存为7GB，PHP在周末运行我们的网站时崩溃，该网站由带有选择性Zend类的Codeigniter提供支持。几乎所有进入我们网站的PHP请求都导致了SIGSEGV。我们运行该网站的同一规范上的其他服务器的数量要少得多。不确定是否相关，我们正在运行APC（PHP 5.3.6附带的版本，我认为它是3.1.3p1），我们发现我们有很多“无法为池分配内存”。在错误日志中。运行APC统计信息我发现缓存已满。

所以我的第一个问题，我认为拥有完整的APC缓存不应该导致SIGSEGV？

这是标题和gdb的PHP 5.3.6，我想出了以下回溯：

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f9d259007e0 (LWP 6020)]
strlen () at ../sysdeps/x86_64/strlen.S:31
31              pcmpeqb (%rdi), %xmm2
(gdb) backtrace
#0  strlen () at ../sysdeps/x86_64/strlen.S:31
#1  0x00007f9d1e14e274 in xbuf_format_converter (xbuf=0x7fffa8560f10, fmt=0x7f9d1e26d0df "s, %s%s given, called in %s on line %d and defined", ap=0x7fffa8560fb0)
    at /usr/src/debug/php-5.3.6/main/spprintf.c:574
#2  0x00007f9d1e14f164 in vspprintf (pbuf=0x7f9d270327d8, max_len=0, format=, ap=) at /usr/src/debug/php-5.3.6/main/spprintf.c:797
#3  0x00007f9d1e19b56f in zend_error (type=4096, format=0x7f9d1e26d0b8 "Argument %d passed to %s%s%s() must %s%s, %s%s given, called in %s on line %d and defined")
    at /usr/src/debug/php-5.3.6/Zend/zend.c:1051
#4  0x00007f9d1e1eac56 in zend_verify_arg_error (execute_data=0x7f9d257e88f8) at /usr/src/debug/php-5.3.6/Zend/zend_execute.c:471
#5  zend_verify_arg_type (execute_data=0x7f9d257e88f8) at /usr/src/debug/php-5.3.6/Zend/zend_execute.c:505
#6  ZEND_RECV_SPEC_HANDLER (execute_data=0x7f9d257e88f8) at /usr/src/debug/php-5.3.6/Zend/zend_vm_execute.h:449
#7  0x00007f9d1e1c0e30 in execute (op_array=0x7f9d26ffe998) at /usr/src/debug/php-5.3.6/Zend/zend_vm_execute.h:107
#8  0x00007f9d1e19b0fd in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /usr/src/debug/php-5.3.6/Zend/zend.c:1194
#9  0x00007f9d1e1487c8 in php_execute_script (primary_file=0x7fffa8563640) at /usr/src/debug/php-5.3.6/main/main.c:2268
#10 0x00007f9d1e2246a5 in php_handler (r=0x7f9d26dbc8c0) at /usr/src/debug/php-5.3.6/sapi/apache2handler/sapi_apache2.c:669
#11 0x00007f9d2593d8b0 in ap_run_handler (r=0x7f9d26dbc8c0) at /usr/src/debug/httpd-2.2.16/server/config.c:158
#12 0x00007f9d2594116e in ap_invoke_handler (r=0x7f9d26dbc8c0) at /usr/src/debug/httpd-2.2.16/server/config.c:376
#13 0x00007f9d2594c5fc in ap_internal_redirect (new_uri=, r=) at /usr/src/debug/httpd-2.2.16/modules/http/http_request.c:502
#14 0x00007f9d1f3637a5 in handler_redirect (r=0x7f9d26dcad38) at /usr/src/debug/httpd-2.2.16/modules/mappers/mod_rewrite.c:4831
#15 0x00007f9d2593d8b0 in ap_run_handler (r=0x7f9d26dcad38) at /usr/src/debug/httpd-2.2.16/server/config.c:158
#16 0x00007f9d2594116e in ap_invoke_handler (r=0x7f9d26dcad38) at /usr/src/debug/httpd-2.2.16/server/config.c:376
#17 0x00007f9d2594c7c0 in ap_process_request (r=0x7f9d26dcad38) at /usr/src/debug/httpd-2.2.16/modules/http/http_request.c:282
#18 0x00007f9d25949698 in ap_process_http_connection (c=0x7f9d26dabf78) at /usr/src/debug/httpd-2.2.16/modules/http/http_core.c:190
#19 0x00007f9d259453c8 in ap_run_process_connection (c=0x7f9d26dabf78) at /usr/src/debug/httpd-2.2.16/server/connection.c:43
#20 0x00007f9d259510b7 in child_main (child_num_arg=) at /usr/src/debug/httpd-2.2.16/server/mpm/prefork/prefork.c:662
#21 0x00007f9d259513ca in make_child (s=0x7f9d268a8860, slot=17) at /usr/src/debug/httpd-2.2.16/server/mpm/prefork/prefork.c:758
#22 0x00007f9d2595204c in perform_idle_server_maintenance (_pconf=, plog=, s=) at /usr/src/debug/httpd-2.2.16/server/mpm/prefork/prefork.c:893
#23 ap_mpm_run (_pconf=, plog=, s=) at /usr/src/debug/httpd-2.2.16/server/mpm/prefork/prefork.c:1097
#24 0x00007f9d25929840 in main (argc=1, argv=0x7fffa8563c88) at /usr/src/debug/httpd-2.2.16/server/main.c:740

使用一些简单的gdb，我发现执行似乎已经到达Zend_Locale :: _ prepareLocale（），显然当PHP试图输出错误消息时，一些错误的指针导致了SIGSEGV：

(gdb) frame 9
#9  0x00007f9d1e1487c8 in php_execute_script (primary_file=0x7fffa8563640) at /usr/src/debug/php-5.3.6/main/main.c:2268
2268                    retval = (zend_execute_scripts(ZEND_REQUIRE TSRMLS_CC, NULL, 3, prepend_file_p, primary_file, append_file_p) == SUCCESS);
(gdb) p *primary_file
$1 = {type = ZEND_HANDLE_FILENAME, filename = 0x7f9d26dcd2d0 "/mnt/goserver/goanimate.com/index.php", opened_path = 0x0, handle = {fd = 646922536, fp = 0x7f9d268f4128, stream = {handle = 0x7f9d268f4128,
      isatty = 0, mmap = {len = 140312938585584, pos = 140312938463096, map = 0x7f9d26dca068, buf = 0x7f9d26dabff8 "\310\307\332&\235\177", old_handle = 0x7f9d25948971, old_closer = 0}, reader = 0xc,
      fsizer = 0x7f9d26dc3840, closer = 0x7f9d26dca078}}, free_filename = 0 '\000'}
(gdb) frame 7
#7  0x00007f9d1e1c0e30 in execute (op_array=0x7f9d27000c40) at /usr/src/debug/php-5.3.6/Zend/zend_vm_execute.h:107
107                     if ((ret = EX(opline)->handler(execute_data TSRMLS_CC)) > 0) {
(gdb) p *op_array
$2 = {type = 2 '\002', function_name = 0x7f9d0ef9aec0 "_prepareLocale", scope = 0x7f9d26ffd228, fn_flags = 1025, prototype = 0x0, num_args = 2, required_num_args = 1, arg_info = 0x7f9d0ef9ae68,
  pass_rest_by_reference = 0 '\000', return_reference = 0 '\000', done_pass_two = 1 '\001', refcount = 0x7f9d27000d38, opcodes = 0x7f9d0efad760, last = 161, size = 161, vars = 0x7f9d0efb2540,
  last_var = 12, size_var = 16, T = 94, brk_cont_array = 0x7f9d0efb2530, last_brk_cont = 1, current_brk_cont = -1, try_catch_array = 0x0, last_try_catch = 0, static_variables = 0x0, start_op = 0x0,
  backpatch_count = 0, this_var = 4294967295, filename = 0x7f9d0ef9aed0 "/mnt/goserver/gslib/include/Zend/Locale.php", line_start = 1003, line_end = 1069,
  doc_comment = 0x7f9d0ef9af08 "/**\n     * Internal function, returns a single locale on detection\n     *\n     * @param  string|Zend_Locale $locale (Optional) Locale to work on\n     * @param  boolean", ' ' , "$strict (Optional) St"..., doc_comment_len = 362, early_binding = 4294967295, reserved = {0x1, 0x0, 0x0, 0x0}}
(gdb) p op_array->arg_info
$3 = (zend_arg_info *) 0x7f9d0ef9ae68
(gdb) p *(op_array->arg_info)
$4 = {name = 0x7f9d0ef9c3b0 "locale", name_len = 6, class_name = 0xffffffff , class_name_len = 0, array_type_hint = 0 '\000', allow_null = 1 '\001',
  pass_by_reference = 0 '\000', return_reference = 0 '\000', required_num_args = 0}
(gdb) frame 2
#2  0x00007f9d1e14f164 in vspprintf (pbuf=0x7f9d27034a98, max_len=0, format=, ap=) at /usr/src/debug/php-5.3.6/main/spprintf.c:797
797             xbuf_format_converter(&xbuf, format, ap);
(gdb) frame 1
#1  0x00007f9d1e14e274 in xbuf_format_converter (xbuf=0x7fffa8560f10, fmt=0x7f9d1e26d0df "s, %s%s given, called in %s on line %d and defined", ap=0x7fffa8560fb0)
    at /usr/src/debug/php-5.3.6/main/spprintf.c:574
574                                                             s_len = strlen(s);
(gdb) p s
$7 = 0xffffffff

我正在考虑在Zend引擎代码中没有注意到的mallocs等失败，但我不太了解Zend内部确认它。有人有这方面的线索吗？感谢。

PHP 5.3.6 SIGSEGV（使用Zend_Locale？）

1 个答案: