Hi everyone,
On 21 April 2010 03:09, sean finney <sean...@debian.org> wrote:
> hi andy,
>
> interesting... it's not clear to me whether this is the same problem, but
> as we haven't received any other follow up i'm happy to run with this
> backtrace and close the bug when we fix any segfault :)
>
> On Tue, Apr 20, 2010 at 08:58:29PM -0500, Andy Wettstein wrote:
>> I'm seeing segfault when attempting to authenticate to gallery2.
>> I'm running with lighttpd and was able generate a core file and backtrace:
>>
>> #0 0x00007f521b85c7c1 in strlen () from /lib/libc.so.6
>> #1 0x00007f52188dc2cd in my_strdup () from /usr/lib/libmysqlclient_r.so.16
>> #2 0x00007f52189071ab in mysql_options () from
>> /usr/lib/libmysqlclient_r.so.16
>> #3 0x00007f521866cfae in zif_mysqli_options (ht=0, return_value=0x2383808,
>> return_value_ptr=0x0, this_ptr=0xffffffff, return_value_used=0)
This is strange. The only call I can see to mysqli_options is in
AdoDB's mysqli driver right before connecting to the server.
This would mean that any page you try to open that connects to the
mysql server should lead to the segfault. Is that so?
Everything AdoDB does is:
mysqli_options($this->_connectionID,$arr[0],$arr[1]);
Where $arr comes from:
var $optionFlags = array(array(MYSQLI_READ_DEFAULT_GROUP,0));
But:
$ php -r '$l = mysqli_init();
var_dump(mysqli_options($l,MYSQLI_READ_DEFAULT_GROUP,0)); '
bool(true)
Even on an clean sid chroot, i686. Andy, what happens when you try to run that?
>From there mysqli_options all it does is find out that the expected
value should be a string and converts the 0 to one. libmysqlcient's
mysql_options is then called:
ret = mysql_options(mysql->mysql, mysql_option, Z_STRVAL_PP(&mysql_value));
mysql_option's relevant code (just executed code, actually) is:
case MYSQL_READ_DEFAULT_GROUP:
my_free(mysql->options.my_cnf_group,MYF(MY_ALLOW_ZERO_PTR));
mysql->options.my_cnf_group=my_strdup(arg,MYF(MY_WME));
break;
And that's all. Like I said, I can't reproduce it.
But there's something interesting from the recently reported (besides
from the 'at something/file.c' not matching the real file for
zif_mysqli_options) http://bugs.php.net/51624 (which is also from a
lighttpd/gallery2 combination.)
Since the variables holding the arguments passed to the function (from
php space) are not yet initialized they indicate php is segfaulting
during zend_parse_method_parameters.
The only recent commit that is related to mysqli is[1] (btw, I might
be too tired but I don't see how that change could possibly fix a
memory leak -- CC'ing Felipe for that.)
[1] http://svn.php.net/viewvc?view=revision&revision=298253
Cheers,
--
Raphael Geissert - Debian Developer
www.debian.org - get.debian.net
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