Bug #81391 [Opn->Fbk]: Segfault in a forked process

From: Date: Fri, 27 Aug 2021 08:41:31 +0000
Subject: Bug #81391 [Opn->Fbk]: Segfault in a forked process
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-236103@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=81391&edit=1

 ID:                 81391
 Updated by:         requinix@php.net
 Reported by:        mrskman at gmail dot com
 Summary:            Segfault in a forked process
-Status:             Open
+Status:             Feedback
 Type:               Bug
 Package:            *General Issues
 Operating System:   Ubuntu 18.04
 PHP Version:        8.0.10
 Block user comment: N
 Private report:     N



Previous Comments:
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[2021-08-27 08:08:40] nikic@php.net

This looks like a stack overflow (due to infinite recursion or too deep recursion) to me. Does that
sound plausible?

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[2021-08-27 07:52:01] mrskman at gmail dot com

Description:
------------
I run pcntl_fork() to process large arrays in background. One of arrays is causing segfaults on 2 of
4 servers. I tried to increase memory limit to a 10x higher value just to be sure this is not a
memory issue but it still segfaults on 2 servers.

I was not able to create a test script. The only thing I have is a backtrace from attached gdb.

Actual result:
--------------
Program received signal SIGSEGV, Segmentation fault.
0x0000564372710a35 in execute_ex ()
(gdb) bt
#0  0x0000564372710a35 in execute_ex ()
#1  0x00005643725ac1cd in zend_call_function ()
#2  0x000056437238beb9 in zif_array_map ()
#3  0x00005643727133c4 in execute_ex ()
#4  0x00005643725ac1cd in zend_call_function ()
#5  0x000056437238beb9 in zif_array_map ()
#6  0x00005643727133c4 in execute_ex ()
#7  0x00005643725ac1cd in zend_call_function ()
#8  0x000056437238beb9 in zif_array_map ()
#9  0x00005643727133c4 in execute_ex ()
#10 0x00005643725ac1cd in zend_call_function ()
#11 0x000056437238beb9 in zif_array_map ()
#12 0x00005643727133c4 in execute_ex ()
#13 0x00005643725ac1cd in zend_call_function ()
#14 0x000056437238beb9 in zif_array_map ()
#15 0x00005643727133c4 in execute_ex ()
...
#1593 0x00005643727133c4 in execute_ex ()
#1594 0x00005643725ac1cd in zend_call_function ()
#1595 0x000056437238beb9 in zif_array_map ()
#1596 0x00005643727133c4 in execute_ex ()
#1597 0x00005643725ac1cd in zend_call_function ()
#1598 0x000056437238beb9 in zif_array_map ()
#1599 0x00005643727133c4 in execute_ex ()
#1600 0x00005643725ac1cd in zend_call_function ()
#1601 0x000056437238beb9 in zif_array_map ()
#1602 0x00005643727133c4 in execute_ex ()
#1603 0x00005643725ac1cd in zend_call_function ()
#1604 0x000056437238beb9 in zif_array_map ()
#1605 0x00005643727133c4 in execute_ex ()
#1606 0x00005643725ac1cd in zend_call_function ()
#1607 0x000056437238beb9 in zif_array_map ()
#1608 0x00005643727133c4 in execute_ex ()
#1609 0x00005643725ac1cd in zend_call_function ()
#1610 0x000056437238beb9 in zif_array_map ()
#1611 0x00005643727133c4 in execute_ex ()
#1612 0x00005643725ac1cd in zend_call_function ()
#1613 0x000056437238beb9 in zif_array_map ()
#1614 0x00005643727133c4 in execute_ex ()
#1615 0x00005643725ac1cd in zend_call_function ()
#1616 0x000056437238beb9 in zif_array_map ()
#1617 0x00005643727133c4 in execute_ex ()
#1618 0x00005643725ac1cd in zend_call_function ()
#1619 0x000056437238beb9 in zif_array_map ()
#1620 0x00005643727133c4 in execute_ex ()
#1621 0x00005643725ac1cd in zend_call_function ()
#1622 0x000056437238beb9 in zif_array_map ()
#1623 0x00005643727133c4 in execute_ex ()
#1624 0x00005643725ac1cd in zend_call_function ()
#1625 0x000056437238beb9 in zif_array_map ()
#1626 0x00005643727133c4 in execute_ex ()
#1627 0x00005643725ac1cd in zend_call_function ()
#1628 0x000056437238beb9 in zif_array_map ()
#1629 0x00005643727133c4 in execute_ex ()
#1630 0x00005643725ac1cd in zend_call_function ()
#1631 0x000056437239fce8 in zif_call_user_func_array ()
#1632 0x00005643727133c4 in execute_ex ()
#1633 0x00005643725ac1cd in zend_call_function ()
#1634 0x000056437239fce8 in zif_call_user_func_array ()
#1635 0x00005643727133c4 in execute_ex ()
#1636 0x000056437272b53d in zend_execute ()
#1637 0x00005643725cf6d9 in zend_execute_scripts ()
#1638 0x000056437250a213 in php_execute_script ()
#1639 0x000056437278ee1f in do_cli ()
#1640 0x00005643727901e6 in main ()



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