#16820 [Fbk->Opn]: hangs in multithreaded environment (ZTS)

From: Date: Wed, 11 Mar 2009 09:14:58 +0000
Subject: #16820 [Fbk->Opn]: hangs in multithreaded environment (ZTS)
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-134591@lists.php.net to get a copy of this message 
 ID:               16820
 User updated by:  wmeler at wp-sa dot pl
 Reported By:      wmeler at wp-sa dot pl
-Status:           Feedback
+Status:           Open
 Bug Type:         Scripting Engine problem
 Operating System: * (ZTS only)
 PHP Version:      5.*, 6, 7, 8..
 New Comment:

What should I say to make you stop using longjmp family calls in signal
handler? 

IT IS NOT THREAD SAFE !!!

You probably can reproduce it with:

./configure --enable-maintainer-zts; make; sapi/cli/php ../aaa.php

Fatal error: Maximum execution time of 1 second exceeded in
/root/aaa.php on line 7
6504146zend_mm_heap corrupted

aaa.php is a script posted 21 Jul 2003 2:07am UTC.


Previous Comments:
------------------------------------------------------------------------

[2009-03-10 15:38:56] kalle@php.net

Please try using this CVS snapshot:

  http://snaps.php.net/php5.2-latest.tar.gz
 
For Windows:

  http://windows.php.net/snapshots/

Can you try a recent snapshot? I cannot reproduce this under CLI on
Ubuntu (5.3.0b1) or Windows (5.2.8) with ZTS

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

[2008-05-08 07:42:41] Olexander Shtepa <isk at idegroup dot com>

This error existats in php version 4.4.8 and 5.2.4.

$ php-4.4.8 test.php
PHP Fatal error:  Maximum execution time of 1 second exceeded in 
test.php on line 7
1369575Segmentation fault
$ php-5.2.4 test.php
PHP Fatal error:  Maximum execution time of 1 second exceeded in 
test.php on line 7
8918675zend_mm_heap corrupted

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

[2004-01-27 03:33:31] wmeler at wp-sa dot pl

Zeev corrected #21513. It won't help.
As long as zend_timeout calls longjmp (through zend_error, php_error_cb
and zend_bailout) shutdown functions can get memory, locks - any objects
in undefined state.
2 years - no change ...

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

[2003-08-13 21:43:09] sniper@php.net

I could finally reproduce this. The patches didn't make any
difference.


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

[2003-07-21 02:46:15] wmeler at wp-sa dot pl

As I said - heap corrupted.
backtrace:

#0  0x40393966 in _efree (ptr=0x42671030, 
    __zend_filename=0x403e5840
"/tmp/php4-STABLE-200307081130/Zend/zend_execute_API.c", 
    __zend_lineno=291, 
    __zend_orig_filename=0x403e5ca0
"/tmp/php4-STABLE-200307081130/Zend/zend_variables.c", 
    __zend_orig_lineno=44) at
/tmp/php4-STABLE-200307081130/Zend/zend_alloc.c:259
#1  0x403a3e18 in _zval_dtor (zvalue=0x81d6018, 
    __zend_filename=0x403e5840
"/tmp/php4-STABLE-200307081130/Zend/zend_execute_API.c", 
    __zend_lineno=291) at
/tmp/php4-STABLE-200307081130/Zend/zend_variables.c:61
#2  0x4039b878 in _zval_ptr_dtor (zval_ptr=0x81d60d4, 
    __zend_filename=0x403e5ca0
"/tmp/php4-STABLE-200307081130/Zend/zend_variables.c", 
    __zend_lineno=167) at
/tmp/php4-STABLE-200307081130/Zend/zend_execute_API.c:291
#3  0x403a40d2 in _zval_ptr_dtor_wrapper (zval_ptr=0x81d60d4)
    at /tmp/php4-STABLE-200307081130/Zend/zend_variables.c:167
#4  0x403aa7a3 in zend_hash_destroy (ht=0x81bfa94)
    at /tmp/php4-STABLE-200307081130/Zend/zend_hash.c:543
#5  0x4039b361 in shutdown_executor (tsrm_ls=0x81aa7f0)
    at /tmp/php4-STABLE-200307081130/Zend/zend_execute_API.c:186
#6  0x403a546d in zend_deactivate (tsrm_ls=0x81aa7f0)
    at /tmp/php4-STABLE-200307081130/Zend/zend.c:666
#7  0x40374772 in php_request_shutdown (dummy=0x0) at
/tmp/php4-STABLE-200307081130/main/main.c:995
#8  0x403c4923 in php_apache_request_dtor (r=0x81a6830,
tsrm_ls=0x81aa7f0)
    at
/tmp/php4-STABLE-200307081130/sapi/apache2handler/sapi_apache2.c:445
#9  0x403c4c4d in php_handler (r=0x81a6830)
    at
/tmp/php4-STABLE-200307081130/sapi/apache2handler/sapi_apache2.c:541
#10 0x808269e in ap_run_handler (r=0x81a6830) at config.c:194


With my patch there are almost no problems. The problem is that
shutdown function won't execute - EG(timeout) flag should be cleared
before execution of shutdown function.
I can correct it if you want.

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

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the rest of the comments, please view the bug report online at
    http://bugs.php.net/16820

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Edit this bug report at http://bugs.php.net/?id=16820&edit=1

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