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Bug #39726 segmentation fault in imap_open
Submitted: 2006-12-04 10:41 UTC Modified: 2006-12-12 01:00 UTC
Votes:3
Avg. Score:4.7 ± 0.5
Reproduced:2 of 2 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: rommer at active dot by Assigned:
Status: No Feedback Package: IMAP related
PHP Version: 4.4.4 OS: Centos-3 x86
Private report: No CVE-ID: None
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 [2006-12-04 10:41 UTC] rommer at active dot by 
Description:
------------
Segmentation fault in function imap_open if script opens
~ 4000 files before.
I have increased __FD_SETSIZE in
/usr/include/bits/typesizes.h
/usr/include/linux/posix_types.h
to 262144 before compiling php (4.4.4, 5.1.6, 4.4.5-dev)


Reproduce code:
---------------
<?                                                                                                              
                                                                                                                
    $basedir = "/tmp/php_testcase";                                                                             
                                                                                                                
    if (! file_exists ($basedir)) {                                                                             
        mkdir ($basedir, 0700);                                                                                 
    }                                                                                                           
                                                                                                                
    $fds = array();                                                                                             
    for ($i = 0; $i < 4096; $i++) {                                                                             
        $fds[] = fopen ($basedir . '/file_' . $i, 'w');                                                         
    }                                                                                                           
                                                                                                                
    imap_open ('{127.0.0.1:143/imap/notls}INBOX',                                                               
               'test@test.com', 'test', 64);                                                                    
                                                                                                                
?>

Expected result:
----------------
no segfault

Actual result:
--------------
Segmentation fault.

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 [2006-12-04 10:50 UTC] tony2001@php.net 
Thank you for this bug report. To properly diagnose the problem, we
need a backtrace to see what is happening behind the scenes. To
find out how to generate a backtrace, please read
http://bugs.php.net/bugs-generating-backtrace.php for *NIX and
http://bugs.php.net/bugs-generating-backtrace-win32.php for Win32

Once you have generated a backtrace, please submit it to this bug
report and change the status back to "Open". Thank you for helping
us make PHP better.
 [2006-12-04 14:17 UTC] rommer at active dot by 
This is backtrace (php with --enable-debug, non-stripped)

(gdb) run -X
Starting program: /usr/local/apache-clean/bin/httpd -X
[Thread debugging using libthread_db enabled]
[New Thread 16384 (LWP 3248)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 16384 (LWP 3248)]
0x404e8e64 in ?? () from /usr/local/apache-clean/modules/libphp4.so
(gdb) bt
#0  0x404e8e64 in ?? () from /usr/local/apache-clean/modules/libphp4.so
#1  0x00001011 in ?? ()
#2  0x00000000 in ?? ()
 [2006-12-04 14:23 UTC] tony2001@php.net 
>I have increased __FD_SETSIZE in <..skip..>to 262144 before compiling php
You should have done this before compiling c-client, as imap_open() is just a wrapper for c-client functions.

Please make sure you've configured PHP with --enabled-debug and regenerate the backtrace.
 [2006-12-12 01:00 UTC] php-bugs at lists dot php dot net 
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
 [2008-12-16 14:51 UTC] michel at webawere dot com 
Hi,

I have this simmular problem. In tried it on centos linux 5.2 with apache and php 5.2.5. AND php 5.2.8

This command will get me an empty webpage and a line about segmentation fault in errorlog.
$mbox = imap_open($mailbox, $user, $passwd);

In errorlog:
[notice] child pid 14851 exit signal Segmentation fault (11)

Is there a work-around ?
regards,
Michel
 
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