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[2007-12-12 10:28 UTC] schulmat at cms dot hu-berlin dot de
Description:
------------
The problem can reproduced on Solaris 9 and Solaris 10.
If I compile php with
./configure \
--prefix=/usr/local/wwwbin/php-5.2.5 \
--with-apxs2=/usr/local/wwwbin/apache/bin/apxs \ (Apache 2.2.6)
--with-sybase-ct=/opt/csw (freetds-version 0.64 from blastwave)
and perform this simple query:
select DC_Rights from Resource R where R.Resource_ID = 123;
(DC_Rights type text, Resource_ID = 123 exists, should return "(empty) not NULL, works via tsql)
i get "Incurred fault #6".
Reproduce code:
---------------
<?php
require("DBConnection.cls.php"); // database connection
$db=new DBConnection(); // new object
$test = "set textsize 262144";
echo $test."<br />";
//$db->submitQuery($test); flush();
$query = "select DC_Rights from Resource R where R.Resource_ID = 122"; // expected Result: NULL
flush();
$res_id = $db->submitQuery($query); // works!
$query = "select DC_Rights from Resource R where R.Resource_ID = 123"; // expected Result: ""
flush();
$res_id = $db->submitQuery($query); // doesn't work. Apache: Segmentation fault (11)
echo "done!";
flush();
exit();
?>
Expected result:
----------------
set textsize 262144
select DC_Rights from Resource R where R.Resource_ID = 122
select DC_Rights from Resource R where R.Resource_ID = 123
done!
Actual result:
--------------
Output:
Warning: sybase_connect() [function.sybase-connect]: Sybase: Server message: Changed client character set setting to 'iso_1'. (severity 10, procedure N/A) in /usr/local/htdocs/DBConnection.cls.php on line 7
Warning: sybase_connect() [function.sybase-connect]: Sybase: Server message: Changed database context to 'metadb'. (severity 10, procedure N/A) in /usr/local/htdocs/DBConnection.cls.php on line 7
Warning: sybase_select_db() [function.sybase-select-db]: Sybase: Server message: Changed database context to 'metadb'. (severity 10, procedure N/A) in /usr/local/htdocs/DBConnection.cls.php on line 10
set textsize 262144
select DC_Rights from Resource R where R.Resource_ID = 27397
select DC_Rights from Resource R where R.Resource_ID = 20676
truss output php-cli:
time() = 1197455005
pollsys(0xFFBFE900, 1, 0x00000000, 0x00000000) = 1
read(4, "FD\0\0\002\0\0\0\0", 9) = 9
time() = 1197455005
time() = 1197455005
sigaction(SIGPIPE, 0xFFBFEBA0, 0xFFBFEC40) = 0
pollsys(0xFFBFEBE8, 1, 0x00000000, 0x00000000) = 1
write(4, "0F01\018\0\0\0\0 !\0\0\0".., 24) = 24
sigaction(SIGPIPE, 0xFFBFEBA0, 0xFFBFEC40) = 0
time() = 1197455005
pollsys(0xFFBFEA08, 1, 0x00000000, 0x00000000) = 1
read(4, "0401\0 r\0\0\0\0", 8) = 8
time() = 1197455005
time() = 1197455005
pollsys(0xFFBFEA08, 1, 0x00000000, 0x00000000) = 1
read(4, "E3\00F0106 m e t a d b06".., 106) = 106
time() = 1197455005
write(1, "\n W a r n i n g : s y".., 177) = 177
Warning: sybase_select_db(): Sybase: Server message: Changed database context to 'metadb'.
(severity 10, procedure N/A) in /usr/local/htdocs/DBConnection.cls.php on line 10
write(1, " s e l e c t D C _ R i".., 64) = 64
time() = 1197453664
sigaction(SIGPIPE, 0xFFBFEBA0, 0xFFBFEC40) = 0
pollsys(0xFFBFEBE8, 1, 0x00000000, 0x00000000) = 1
write(4, "0F01\0 J\0\0\0\0 !\0\0\0".., 74) = 74
sigaction(SIGPIPE, 0xFFBFEBA0, 0xFFBFEC40) = 0
time() = 1197453664
pollsys(0xFFBFEA08, 1, 0x00000000, 0x00000000) = 1
read(4, "0401\0 ;\0\0\0\0", 8) = 8
time() = 1197453664
time() = 1197453664
pollsys(0xFFBFEA08, 1, 0x00000000, 0x00000000) = 1
read(4, "EE\0 !\001\t D C _ R i g".., 51) = 51
time() = 1197453664
write(1, " s e l e c t D C _ R i".., 64) = 64
time() = 1197453664
sigaction(SIGPIPE, 0xFFBFEBA0, 0xFFBFEC40) = 0
pollsys(0xFFBFEBE8, 1, 0x00000000, 0x00000000) = 1
write(4, "0F01\0 J\0\0\0\0 !\0\0\0".., 74) = 74
sigaction(SIGPIPE, 0xFFBFEBA0, 0xFFBFEC40) = 0
time() = 1197453664
pollsys(0xFFBFEA08, 1, 0x00000000, 0x00000000) = 1
read(4, "0401\0 W\0\0\0\0", 8) = 8
time() = 1197453664
time() = 1197453664
pollsys(0xFFBFEA08, 1, 0x00000000, 0x00000000) = 1
read(4, "EE\0 !\001\t D C _ R i g".., 79) = 79
time() = 1197453664
Incurred fault #6, FLTBOUNDS %pc = 0xFEC40E48
siginfo: SIGSEGV SEGV_MAPERR addr=0x004DE000
Received signal #11, SIGSEGV [default]
siginfo: SIGSEGV SEGV_MAPERR addr=0x004DE000
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Last updated: Wed Oct 29 12:00:01 2025 UTC |
I get the following after running the test case: PHP Warning: Module 'pdo_mysql' already loaded in Unknown on line 0 bool(true) bool(true) bool(true) bool(true) >>> Query: select DC_Rights from #Resource where Resource_ID = 122 <<< Return: resource array(0) { } >>> Query: select DC_Rights from #Resource where Resource_ID = 123 <<< Return: resource array(1) { [0]=> array(1) { ["DC_Rights"]=> NULL } } >>> Query: select DC_Rights from #Resource where Resource_ID = 124 Segmentation fault: 11 (core dumped) This is on 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Sun Feb 24 10:35:36 UTC 2008 root@driscoll.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64 But, I also have the same trouble on a ubuntu box. PHP 5.2.12 with Suhosin-Patch 0.9.7 (cli) (built: Jan 9 2010 14:15:45) Copyright (c) 1997-2009 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies with eAccelerator v0.9.5.3, Copyright (c) 2004-2006 eAccelerator, by eAccelerator tds version = 7.0 and tds_version = 8.0 both fail Database is MSSQL Server Express Edition version 9.00.1399.06 The following patch fixes the issue but it's a hack. I compiled php5-sybase_ct with debug enabled and the seg fault occurred at line 1208. --- php_sybase_ct2.c 2010-01-15 14:03:13.000000000 -0800 +++ php_sybase_ct.c 2010-01-15 14:00:15.000000000 -0800 @@ -1205,6 +1205,7 @@ static int php_sybase_fetch_result_row ( default: { /* This indicates anything else, return it as string */ + if(result->lengths[j] < 1){result->lengths[j]=1;} ZVAL_STRINGL(&result->data[i][j], result->tmp_buffer[j], result->lengths[j]- 1, 1); break; } My guess is ct_bind is returning an indicator of -1 on some systems for text fields == '' so there is no seg fault. While on systems which seg fault the indicator from ct_bind is 0 for text fields == ''.