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Bug #73937 x86_64, kernel-4.9.1-gentoo
Submitted: 2017-01-14 20:16 UTC Modified: 2021-01-24 04:22 UTC
Votes:9
Avg. Score:4.8 ± 0.6
Reproduced:8 of 8 (100.0%)
Same Version:3 (37.5%)
Same OS:2 (25.0%)
From: vadim dot gunter200 at outlook dot com Assigned: cmb (profile)
Status: No Feedback Package: opcache
PHP Version: 7.0.14 OS: Gentoo
Private report: No CVE-ID: None
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 [2017-01-14 20:16 UTC] vadim dot gunter200 at outlook dot com 
Description:
------------
segmentation the error is in that function
$sessionout = new SNMP(SNMP::VERSION_2C, $ip_addr_comm, "public");
$aout = @$sessionout->walk(array("ifOutOctets"));

Similarly, this function
snmpwalk($ip_addr_comm, "public", "ifOutOctets");

Test script:
---------------
<?php
class My extends Thread{
public function __construct($comm_ip){
  $this->comm_ip=$comm_ip; }
    function run(){		
    	$ip_addr_comm=$this->comm_ip;
			  $sessionout = new SNMP(SNMP::VERSION_2C, $ip_addr_comm, "public");
 		       $aout = @$sessionout->walk(array("ifOutOctets"));
 		       if ($sessionout->getErrno() == SNMP::ERRNO_TIMEOUT) { echo "234";};
  	$sessionout->close();
}}
$row = array('ipaddres1' => '172.16.12.6','ipaddres2' => '172.16.12.5','ipaddres3' => '172.16.12.4','ipaddres4' => '172.16.12.7','ipaddres5' => '172.16.12.3','ipaddres6' => '172.16.11.3','ipaddres6' => '172.16.11.3');

foreach ($row as $d) {
	$comm_ip = $d;
    $pool[] = new My($comm_ip);
} 
foreach($pool as $worker){ $worker->start(); }
foreach($pool as $worker){ $worker->join();  }

Expected result:
----------------
Segmentation fault


Actual result:
--------------
7f7f417a0000-7f7f419a0000[7163]: ---p 00010000 08:03 1679689                    /usr/lib64/php7.0/lib/extensions/no-debug-zts-20151012/ssh2.so
7f7f419a0000-7f7f419a1000 r--p 00010000 08:03 1679689                    /usr/lib64/php7.0/lib/extensions/no-debug-zts-20151012/ssh2.so
7f7f419a1000-7f7f419a2000 rw-p 00011000 08:03 1679689                    /usr/lib64/php7.0/lib/extensions/no-debug-zts-20151012/ssh2.so
7f7f419a2000-7f7f419a8000 r-xp 00000000 08:03 3039937                    /lib64/librt-2.23.so
7f7f419a8000-7f7f41ba8000 ---p 00006000 08:03 3039937                    /lib64/librt-2.23.so
7f7f41ba8000-7f7f41ba9000 r--p 00006000 08:03 3039937                    /lib64/librt-2.23.so
7f7f41ba9000-7f7f41baa000 rw-p 00007000 08:03 3039937                    /lib64/librt-2.23.so
7f7f41baa000-7f7f41bb2000 r-xp 00000000 08:03 1679690                    /usr/lib64/php7.0/lib/extensions/no-debug-zts-20151012/sync.so
7f7f41bb2000-7f7f41db2000 ---p 00008000 08:03 167969
Jan 17 03:42:27 localhost php[7163]:
Jan 17 03:42:27 localhost php[7163]:
Jan 17 03:42:27 localhost php[7163]:
Jan 17 03:42:27 localhost php(execute_ex+0x1b)[7163]:
Jan 17 03:42:27 localhost /usr/lib64/php7.0/lib/extensions/no-debug-zts-20151012/pthreads.so(+0x8da5)[7163]:
Jan 17 03:42:27 localhost php(zend_call_function+0x99b)[7163]:
Jan 17 03:42:27 localhost /usr/lib64/php7.0/lib/extensions/no-debug-zts-20151012/pthreads.so(+0x13205)[7163]:
Jan 17 03:42:27 localhost /usr/lib64/php7.0/lib/extensions/no-debug-zts-20151012/pthreads.so(+0x13307)[7163]:
Jan 17 03:42:27 localhost /usr/lib64/php7.0/lib64/opcache.so
7f7f41ffd000-7f7f421fd000[7163]: ---p 00031000 08:03 3261137                    /usr/lib64/php7.0/lib64/opcache.so
7f7f421fd000-7f7f421fe000 r--p 00031000 08:03 3261137                    /usr/lib64/php7.0/lib64/opcache.so
7f7f421fe000-7f7f421ff000 rw-p 00032000 08:03 3261137                    /usr/lib64/php7.0/lib64/opcache.so
7f7f421ff000-7f7f42400000 rw-p 00000000 00:00 0

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 [2020-11-11 13:21 UTC] cmb@php.net
-Package: pthreads +Package: SNMP related
 [2021-01-13 18:24 UTC] cmb@php.net
-Status: Open +Status: Feedback -Package: SNMP related +Package: opcache -Assigned To: +Assigned To: cmb
 [2021-01-13 18:24 UTC] cmb@php.net 
Do you still get the segfault with any of the actively supported
PHP versions[1]?  If so, please provide a backtrace with debug
symbols[2]?  Also, this looks more like an OPcache issue.

[1] <https://www.php.net/supported-versions.php>
[2] <https://bugs.php.net/bugs-generating-backtrace.php>
 [2021-01-24 04:22 UTC] php-bugs at lists dot php dot net 
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 
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