ID: 38819
User updated by: madcoder at gmail dot com
Reported By: madcoder at gmail dot com
Status: Open
Bug Type: LDAP related
Operating System: 2.6.15-gentoo linux amd64
PHP Version: 5.1.6
New Comment:
Any other ideas? This problem is kind of a blocker for me right now...
I still don't understand why it works fine inside valgrind, but it
segfaults on its own and inside gdb. I know it's segfaulting because
of the message "Cannot access memory at address 0x55a0bfe0", so the for
loop checking vals[i] obviously fails. But what steps can I take to
debug this further?
It could be a problem in openldap, since the line in php's ldap.c just
before it calls the openldap function 'ldap_count_values' is
ldap_get_values(), which is what is returning the memory address of
0x55a0bfe0. But if it were in fact a problem with openldap, would the
cli ldapsearch fail as well?
Previous Comments:
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[2006-09-26 11:08:50] madcoder at gmail dot com
I've tried, but the program doesn't segfault, so it exits normally.
I'm not very experienced with gdb, so I'm not sure how to give it a
breakpoint of ldap_count_values (I tried 'break ldap_count_values' and
'break ldap_count_values()', and it doesn't break).
It does still return the information as expected.
------------------------------------------------------------------------
[2006-09-26 10:57:53] [EMAIL PROTECTED]
Is it possible to perform the same actions using ldapsearch utility in
console?
------------------------------------------------------------------------
[2006-09-26 10:43:23] madcoder at gmail dot com
Program received signal SIGSEGV, Segmentation fault.
0x00002af2b2e5f0ab in ldap_count_values (vals=0x55a07f90) at
getvalues.c:153
153 for ( i = 0; vals[i] != NULL; i++ )
(gdb) p vals
$1 = (char **) 0x55a07f90
(gdb) p 0
$2 = 0
(gdb) p vals[0]
Cannot access memory at address 0x55a07f90
The memory address is the same. Can't access memory? It seems like
its a problem in php's ldap_get_entries still (or further up the stack)
because ldap_count_entries(), which calls the same function, works fine
and returns '1'.
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[2006-09-26 10:38:38] [EMAIL PROTECTED]
And what is in vals[0] ?
(gdb) p vals[0]
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[2006-09-26 10:28:55] madcoder at gmail dot com
I do still get the segfault. This is the output from gdb:
(gdb) set args -e test.php
(gdb) run
Starting program: /root/php-5.1.6/sapi/cli/php -e test.php
done searching
Count: 1 entries
Program received signal SIGSEGV, Segmentation fault.
0x00002b92baa9a0ab in ldap_count_values (vals=0x55a07f90) at
getvalues.c:153
153 for ( i = 0; vals[i] != NULL; i++ )
(gdb) f 0
#0 0x00002b92baa9a0ab in ldap_count_values (vals=0x55a07f90) at
getvalues.c:153
153 for ( i = 0; vals[i] != NULL; i++ )
(gdb) p vals
$1 = (char **) 0x55a07f90
(gdb) p i
$2 = 0
If I'm understanding that correctly, it means the segfault is occuring
on the first iteration of the ldap_count_values() for loop. The first
thing I notice is that 'vals' is a 32-bit pointer. Would that have any
effect on the problem, considering this is a 64-bit system? Should I
have 32-bit emulation libraries installed for this? The only reason I
haven't installed the libraries so far is because none of the other
packages I've installed have specifically said that they are necessary.
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The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
http://bugs.php.net/38819
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Edit this bug report at http://bugs.php.net/?id=38819&edit=1
