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ID Category Severity Reproducibility Date Submitted Last Update
0003611 [Quercus] minor always 07-27-09 10:43 07-27-09 10:47
Reporter tlandmann View Status public  
Assigned To
Priority normal Resolution open Platform
Status new   OS
Projection none   OS Version
ETA none Fixed in Version Product Version 4.0.0
  Product Build
Summary 0003611: Call Stack getting broken (apparently)
Description The script below prints an impossible result in Quercus:
Suddenly the bottom of the call stack (invocation of some_function() from the end of the script) is gone.

However it seems that the bug is only limited to debug_backtrace(), so there're no negative effect on programs that don't rely on this PHP function.

I didn't prove that though.


--------------------

<?php

function dump_trace()
{
    foreach (debug_backtrace() as $cur_stack_element)
    {
        echo "# {$cur_stack_element['function']}() from {$cur_stack_element['file']}:{$cur_stack_element['line']}\n";
    }
    echo "\n";
}

function some_function($depth=0, $max_depth=5)
{
    if ($depth<$max_depth)
    {
        dump_trace();
        
        if ($depth==2)
        {
            $function_name='some_function';
            $function_name($depth+1, $max_depth); // this syntax, although valid PHP, causes the problem
        }
        else
        {
            some_function($depth+1, $max_depth); // works
            // call_user_func_array($function_name, array($depth+1, $max_depth)); // may also want to try this one -> it also works
        }
    }
}

some_function();

dump_trace();

?>

----------------
Steps To Reproduce
Additional Information
Attached Files

- Relationships

- Notes
(0004101)
tlandmann
07-27-09 10:47

 sample output of the script running in Quercus:

------------------------

# dump_trace() from test2.php:16
# some_function() from test2.php:31

# dump_trace() from test2.php:16
# some_function() from test2.php:25
# some_function() from test2.php:31

# dump_trace() from test2.php:16
# some_function() from test2.php:25
# some_function() from test2.php:25
# some_function() from test2.php:31

# dump_trace() from test2.php:16
# some_function() from test2.php:25
# some_function() from test2.php:25

# dump_trace() from test2.php:16
# some_function() from test2.php:25
# some_function() from test2.php:25
# some_function() from test2.php:25

# dump_trace() from test2.php:33

------------------------

output from standard PHP 5.2.6:

------------------------

# dump_trace() from test2.php:16
# some_function() from test2.php:31

# dump_trace() from test2.php:16
# some_function() from test2.php:25
# some_function() from test2.php:31

# dump_trace() from test2.php:16
# some_function() from test2.php:25
# some_function() from test2.php:25
# some_function() from test2.php:31

# dump_trace() from test2.php:16
# some_function() from test2.php:21
# some_function() from test2.php:25
# some_function() from test2.php:25
# some_function() from test2.php:31

# dump_trace() from test2.php:16
# some_function() from test2.php:25
# some_function() from test2.php:21
# some_function() from test2.php:25
# some_function() from test2.php:25
# some_function() from test2.php:31

# dump_trace() from test2.php:33

------------------------
 

- Issue History
Date Modified Username Field Change
07-27-09 10:43 tlandmann New Issue
07-27-09 10:47 tlandmann Note Added: 0004101

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