Bug #81195 [Opn]: pcntl_fork() cause child process hungup.

Edit report at https://bugs.php.net/bug.php?id=81195&edit=1 ID: 81195 Updated by: requinix@php.net Reported by: jedemon at gmail dot com Summary: pcntl_fork() cause child process hungup. Status: Open Type: Bug Package: PCNTL related Operating System: CentOS7 and Ubuntu16 PHP Version: 7.4.20 Block user comment: N Private report: N New Comment: I can't reproduce on Ubuntu 18.04. If pcntl_wait is indeed waiting then that means the process has a child, and I don't see how your -r code could create a third (grand)child process. While it hangs, how many "php" processes are running on the system? Previous Comments: ------------------------------------------------------------------------ [2021-06-23 08:09:28] jedemon at gmail dot com Description: ------------ From php7.4.11 to php7.4.20, when execute pcntl_fork(), the forked child process will not terminate. Execute this line: php -r "\pcntl_fork(); if(posix_getpid()){pcntl_wait(\$st);} echo 'exit'.PHP_EOL;" and shell will hung. This dose not happen in under PHP7.4.10, nor in above PHP8.0+. Tested on Centos7 and Ubuntu16.04. There is no related info I can find out. Test script: --------------- php -r "\pcntl_fork(); if(posix_getpid()){pcntl_wait(\$st);} echo 'exit'.PHP_EOL;" Expected result: ---------------- exit exit Actual result: -------------- exit ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=81195&edit=1