Bug #51580 [NEW]: socket_select randomly crashes when used together with fork and Unix signals

From: Date: Sat, 17 Apr 2010 00:11:02 +0000
Subject: Bug #51580 [NEW]: socket_select randomly crashes when used together with fork and Unix signals
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-149623@lists.php.net to get a copy of this message 
From:             
Operating system: Debian Linux
PHP version:      5.3.2
Package:          PCNTL related
Bug Type:         Bug
Bug description:socket_select randomly crashes when used together with fork and Unix signals

Description:
------------
When firing unix signals onto a forked process with pcntl_signal handlers
active and a socket_select currently running, socket_select may crash.

Run the test script with php test.php 1339, and then launch some "kill -s
10 <child pid>" on it. After some, maybe just one, kill's, the script will
crash.

Test script:
---------------
http://php.pastebin.com/Td68vtMn

Expected result:
----------------
Installing signal handlers
Installing handler for signal 15
Installing handler for signal 10
child-pid 20030
running
marco@vs932:~/php_daemon$ kill -s 10 20030
got signal 10
marco@vs932:~/php_daemon$ kill -s 10 20030
got signal 10
marco@vs932:~/php_daemon$ kill -s 10 20030
got signal 10

(etc)

Actual result:
--------------
Installing signal handlers
Installing handler for signal 15
Installing handler for signal 10
child-pid 20030
running
marco@vs932:~/php_daemon$ kill -s 10 20030
got signal 10
marco@vs932:~/php_daemon$ kill -s 10 20030
got signal 10
marco@vs932:~/php_daemon$ kill -s 10 20030
got signal 10
marco@vs932:~/php_daemon$ kill -s 10 20030
marco@vs932:~/php_daemon$ PHP Warning:  socket_select(): unable to select
[4]: Interrupted system call in /home/marco/php_daemon/test.php on line 39
socket_select failed: Interrupted system call
end

marco@vs932:~/php_daemon$ 

-- 
Edit bug report at http://bugs.php.net/bug.php?id=51580&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=51580&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=51580&r=trysnapshot53
Try a snapshot (PHP 6.0):            http://bugs.php.net/fix.php?id=51580&r=trysnapshot60
Fixed in SVN:                        http://bugs.php.net/fix.php?id=51580&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=51580&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=51580&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=51580&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=51580&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=51580&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=51580&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=51580&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=51580&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=51580&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=51580&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=51580&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=51580&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=51580&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=51580&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=51580&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=51580&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=51580&r=mysqlcfg

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