ID: 39460 Updated by: [EMAIL PROTECTED] Reported By: ben at thelemite dot freeserve dot co dot uk -Status: Open +Status: Assigned Bug Type: MSSQL related Operating System: Solaris 10 PHP Version: 5.2.0 -Assigned To: +Assigned To: fmk
Previous Comments: ------------------------------------------------------------------------ [2006-11-10 14:32:48] ben at thelemite dot freeserve dot co dot uk - ------------------------------------------------------------------------ [2006-11-10 13:56:42] ben at thelemite dot freeserve dot co dot uk Firstly I seem to have narrowed it down a little further. Crashes only occur when the first 64-bit field occurs in column 2 (as in my test table). If I rearrange the table to something like TestTable { id, int value1, int value2, bigint } suddenly it doesn't crash anymore. very, very weird. anyway, the requested backtrace:- php_mssql_get_column_content_with_type+0x2b8(6c0178, 2, 604998, 3e, 6140d8, 61357c) _mssql_fetch_batch+0x244(0, 6037c8, ffffffff, 0, 2, 523858) zif_mssql_query+0x2a4(2, 604ae0, ffffffff, 6c0178, 2, ffbfed60) zend_do_fcall_common_helper_SPEC+0x6f0(ffbfee08, ffbfee08, 1, 688e20, ffbfee08, 66d9e0) execute+0x10c(6418d8, 40, 523818, ffbff0dc, 168, 748c) zend_do_fcall_common_helper_SPEC+0x204(ffbff1e0, 35ebd8, 1, 6418d8, ffbff1e0, 1) execute+0x10c(689008, 40, 523818, ffbff3b4, 78, 748c) zend_do_fcall_common_helper_SPEC+0x204(ffbff3e0, ffbff3e0, 1, 0, 0, ffbff4a8) execute+0x10c(5fffa0, ffbffc70, 1e8ff0, ffbff4ac, 4, 2279ac) zend_execute_scripts+0xe0(7c54, 0, 3, ffbff598, 523598, ffbffc70) php_execute_script+0x260(ffbffc70, 74, 2d00, 74657374, 0, ffbffa48) main+0xfb8(2, ffbffd0c, ffbffd18, 50bf40, 0, 0) _start+0x5c(0, 0, 0, 0, 0, 0) ------------------------------------------------------------------------ [2006-11-10 12:58:31] [EMAIL PROTECTED] Thank you for this bug report. To properly diagnose the problem, we need a backtrace to see what is happening behind the scenes. To find out how to generate a backtrace, please read http://bugs.php.net/bugs-generating-backtrace.php for *NIX and http://bugs.php.net/bugs-generating-backtrace-win32.php for Win32 Once you have generated a backtrace, please submit it to this bug report and change the status back to "Open". Thank you for helping us make PHP better. ------------------------------------------------------------------------ [2006-11-10 12:55:39] ben at thelemite dot freeserve dot co dot uk Just to clarify; it segfaults both in apache mod and cli. SQL Server 2003 is being used. built using gcc 3.4.6, and mssql is built-in (not DSO loaded) ------------------------------------------------------------------------ [2006-11-10 12:44:31] ben at thelemite dot freeserve dot co dot uk Description: ------------ Executing SELECT * queries on tables that contain 64-bit values (such as bigints) cause a seg fault. Segfault occurs in php_mssql_get_column_content_with_type within php_mssql.c It's probably system dependent but has been verified on a separate Solaris 10 setup. Note the following things though: 1) Running queries containing 64-bit fields that do not contain the primary key do not seem to cause the crash, e.g: "SELECT value from TestTable", but individually selecting fields does, e.g: "SELECT id,value". Bizzarely "SELECT value,id" doesn't cause a crash. 2) There seems to be some weird allocation issues going on that I have not been able to get to the bottom of. In php_mssql_get_column_content_with_type there is: case SQLFLT8: ZVAL_DOUBLE(result, (double) floatcol8(offset)); break; If I change it to: case SQLFLT8: { DBFLT8 res_buf; memcpy(&res_buf, &floatcol8(offset), 8); ZVAL_DOUBLE(result, res_buf); } break; It cures the problem! But (very bizzarely), the following code still crashes: res_buf = *(DBFLT8 *)dbdata(mssql_ptr->link,offset); ZVAL_DOUBLE(result, res_buf); BUT... It does not crash at the point of reading the data into res_buf. It's crashes when something is done with the value! (Possibly FreeTDS is corrupting the stack?). Help! SunOS 5.10 Generic_118833-17 sun4u sparc SUNW,Ultra-60 PHP 5.1.6 (cli) (built: Oct 26 2006 15:30:54) [same on 5.2.0 as well though] FreeTDS 0.63 Reproduce code: --------------- Table I have been using for experimenting:- TestTable { id, int value, bigint } PHP code to generate crash:- $link = mssql_connect("MyServer","MyUser","MyPassword"); $q = mssql_query("SELECT * from TestTable"); echo $q; Expected result: ---------------- Resource id #X Actual result: -------------- nothing (segfaults when run from CLI) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=39460&edit=1