Bug #80523 [Com]: bogus parse error on >4GB source code

Edit report at https://bugs.php.net/bug.php?id=80523&edit=1 ID: 80523 Comment by: divinity76+spam at gmail dot com Reported by: divinity76 at gmail dot com Summary: bogus parse error on >4GB source code Status: Closed Type: Bug Package: Reproducible crash PHP Version: 7.4.13 Assigned To: nikic Block user comment: N Private report: N New Comment: @nikic indeed it was; seems about 76GB of ram is needed to test this bug, and the current php-8.1.0-dev is immune :) quote from testing on a 128GB ram system: root@localhost:/temp# /usr/bin/time -v /temp/php-src/sapi/cli/php -r 'ini_set("memory_limit","-1");require("wtf.php");echo "it worked!";var_dump(memory_get_peak_usage(false),memory_get_peak_usage(true),memory_get_usage(false),memory_get_usage(true));' it worked!int(90195052680) int(90230177792) int(391088) int(17223909376) Command being timed: "/temp/php-src/sapi/cli/php -r ini_set("memory_limit","-1");require("wtf.php");echo "it worked!";var_dump(memory_get_peak_usage(false),memory_get_peak_usage(true),memory_get_usage(false),memory_get_usage(true));" User time (seconds): 330.95 System time (seconds): 175.72 Percent of CPU this job got: 96% Elapsed (wall clock) time (h:mm:ss or m:ss): 8:47.20 Average shared text size (kbytes): 0 Average unshared data size (kbytes): 0 Average stack size (kbytes): 0 Average total size (kbytes): 0 Maximum resident set size (kbytes): 75538080 Average resident set size (kbytes): 0 Major (requiring I/O) page faults: 0 Minor (reclaiming a frame) page faults: 48743267 Voluntary context switches: 1 Involuntary context switches: 8120 Swaps: 0 File system inputs: 0 File system outputs: 0 Socket messages sent: 0 Socket messages received: 0 Signals delivered: 0 Page size (bytes): 4096 Exit status: 0 root@localhost:/temp# du -h wtf.php 4.1G wtf.php root@localhost:/temp# head wtf.php <?php return array('hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello',(capped) Previous Comments: ------------------------------------------------------------------------ [2020-12-16 09:59:49] nikic@php.net @divinity76: I've tested this with 64GB RAM, which was not sufficient :) Maybe 128GB will be enough... ------------------------------------------------------------------------ [2020-12-16 09:29:24] divinity76 at gmail dot com nikic@php.net you said you get OOM killed before being able to test it? on how much ram? i have a 64GB ram system to test on, and a 128GB ram system is on the way (should be ready in a couple of days) ------------------------------------------------------------------------ [2020-12-16 09:21:14] nikic@php.net Automatic comment on behalf of nikita.ppv@gmail.com Revision: http://git.php.net/?p=php-src.git;a=commit;h=118ff03335d67c19817ff83d89e634fcd39275ff Log: Fix bug #80523 ------------------------------------------------------------------------ [2020-12-16 03:22:15] divinity76 at gmail dot com Description: ------------ it appears that PHP crash when trying to parse source code above 4GB in size, notably the code below is not a syntax error if you change it to $imax = (int)((1*1024*1024*1024)/strlen("'hello',")); but if you just change the 1* to 4*, it's suddenly a "syntax error", PS: don't recommend trying this on a system with less than 20GB ram, htop reported over 18GB ram while running.. Test script: --------------- <?php $str='<?php return array('; $imax = (int)((4*1024*1024*1024)/strlen("'hello',")); echo "generating.."; $str.=str_repeat("'hello',",$imax); $str.=");"; echo "generated. writing."; file_put_contents("wtf.php",$str); echo "written. gcing"; unset($str);gc_collect_cycles(); // << dunno if that actually helps echo ". done. including."; require("wtf.php"); Expected result: ---------------- no syntax error Actual result: -------------- root@x2ratma:/temp/fag# time php fag.php generating..generated. writing.written. gcing. done. including.PHP Parse error: syntax error, unexpected ''h' (T_ENCAPSED_AND_WHITESPACE), expecting ')' in /temp/fag/wtf.php on line 1 real 0m24.960s user 0m4.927s sys 0m17.147s root@x2ratma:/temp/fag# ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=80523&edit=1