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[2020-05-18 17:47 UTC] tom at advancedatatools dot com
Description:
------------
When doing a simple query using bound parameters php segfaults on the fetch line.
This happens for all tested data types, using named vs numbered bound parameters, and on every version of php tested (5.6, 7.2, 7.3).
This happens regardless of what it is fetching.
This is using Informix as the back end engine.
Test script:
---------------
$sth = $dbh->prepare("select item_num from items where item_num = ?");
$sth->bindParam(1,2);
#Works
$sth->execute();
#Segfaults for any type of fetch
$row = $sth->fetch(PDO::FETCH_NUM);
Expected result:
----------------
$row should return the record
Actual result:
--------------
Segmentation fault (core dumped)
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Last updated: Fri Oct 24 04:00:01 2025 UTC |
Correction on test sql: $sth = $dbh->prepare("select item_num from items where item_num = ?"); $vars = array(2); #Works $sth->execute($vars); #Segfaults for any type of fetch $row = $sth->fetch(PDO::FETCH_NUM);Confirmed it still occurs in 7.4 Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. 0x00007fffed45bcaf in ?? () from /usr/lib/libodbccr.so (gdb) bt #0 0x00007fffed45bcaf in ?? () from /usr/lib/libodbccr.so #1 0x00007fffed45c115 in ?? () from /usr/lib/libodbccr.so #2 0x00007fffed45c555 in ?? () from /usr/lib/libodbccr.so #3 0x00007ffff0a212d6 in SQLFetchScroll () from /usr/lib/x86_64-linux-gnu/libodbc.so.2 #4 0x00007ffff05fc64b in ?? () from /usr/lib/php/20190902/pdo_odbc.so #5 0x00007ffff2887242 in ?? () from /usr/lib/php/20190902/pdo.so #6 0x00007ffff288735a in ?? () from /usr/lib/php/20190902/pdo.so #7 0x00007ffff2888b62 in ?? () from /usr/lib/php/20190902/pdo.so #8 0x00005555558730d7 in execute_ex () #9 0x0000555555875752 in zend_execute () #10 0x00005555557e8fd2 in zend_execute_scripts () #11 0x0000555555787e50 in php_execute_script () #12 0x0000555555877743 in ?? () #13 0x00005555556428d6 in ?? () #14 0x00007ffff5c1fb97 in __libc_start_main (main=0x5555556424c0, argc=2, argv=0x7fffffffe578, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe568) at ../csu/libc-start.c:310 #15 0x0000555555642a7a in _start ()