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[2005-02-05 20:31 UTC] bertrand at toggg dot com
Description: ------------ This script doubles and again an array of long strings. It accepts 3 parameters: - nb of times to double the array - eventuel memory_limit to set (thus default 8 Mo) - interval of added rows to check memory_get_usage. By 18 loops the 8Mo are exhausted. Depending on the memory setting and the interval to check memory usage, results are somewhat strange. The segmentation fault occurs the same if running from Apache 2.0 Handler It could be related to bug #31624 Reproduce code: --------------- $loop = isset($_SERVER['argv'][1]) ? $_SERVER['argv'][1]+0 : 11; $setmem = isset($_SERVER['argv'][2]) ? $_SERVER['argv'][2]+0 : ''; // changed if set $chk = isset($_SERVER['argv'][3]) ? $_SERVER['argv'][3]+0 : 100; if ($setmem) { if (ini_set ('memory_limit', $setmem*1048576)) { echo 'Set memory limit to '.$setmem." Mo\n"; } else { echo 'FAILED to set memory limit to '.$setmem." Mo\n"; } } error_reporting(E_ALL); $arr = array (str_repeat('X', 65536)); $mem = 0; while ($loop--) { for ($i = count($arr); $i; $i--) { $arr[] = $arr[0]; if ($i%$chk) continue; if ( ( ($nmem = memory_get_usage()) - $mem) > 1000000) { $mem = $nmem; echo 'Count:'.count($arr)." ($mem bytes)\n"; } } echo $loop.':'.count($arr).'/'.memory_get_usage() . " bytes\n"; // 36640 } echo "\n OK \n"; Expected result: ---------------- 1) no memory_limit set PHP Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 35 bytes) in /home/bertrand/prog/test/outmem.php on line 19 + break 2) with memory_limit set. If not enough: same as 1) Enough memory: OK Actual result: -------------- 1) no memory_limit set I actually get memory exhausted, but if I lower the memory_get_usage frequence, then no break, must control-C: php outmem.php 18 '' 100 ---> break, get hand back php outmem.php 18 '' 1000 ---> I must abort That means if I check memory_get_usage only each 1000 rows PHP is not coming back, but everything OK if I check each 100 rows ???? PHP Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 35 bytes) in /home/bertrand/prog/test/outmem.php on line 19 Allowed memory size of 8388608 bytes exhausted (tried to allocate 129 bytes) The second message is coming after a long while, but the PHP is sleeping and I need to break 2) with memory_limit It's as expected but will in both cases (enough mem or not) make a segmentation fault. PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Hope it's usefull for you: Core was generated by `./php outmem.php 18 12 100'. Program terminated with signal 11, Segmentation fault. Reading symbols from /lib/libcrypt.so.1...done. Loaded symbols for /lib/libcrypt.so.1 Reading symbols from /lib/libresolv.so.2...done. Loaded symbols for /lib/libresolv.so.2 Reading symbols from /lib/tls/libm.so.6...done. Loaded symbols for /lib/tls/libm.so.6 Reading symbols from /lib/libdl.so.2...done. Loaded symbols for /lib/libdl.so.2 Reading symbols from /lib/libnsl.so.1...done. Loaded symbols for /lib/libnsl.so.1 Reading symbols from /lib/tls/libc.so.6...done. Loaded symbols for /lib/tls/libc.so.6 Reading symbols from /lib/ld-linux.so.2...done. Loaded symbols for /lib/ld-linux.so.2 Reading symbols from /lib/libnss_files.so.2...done. Loaded symbols for /lib/libnss_files.so.2 #0 0x00c713d4 in _int_free () from /lib/tls/libc.so.6 (gdb) bt #0 0x00c713d4 in _int_free () from /lib/tls/libc.so.6 #1 0x00c7272b in free () from /lib/tls/libc.so.6 #2 0x081041c9 in shutdown_memory_manager (silent=0, clean_cache=0) at /home/bertrand/down/php4-STABLE-200502160330/Zend/zend_alloc.c:492 #3 0x080eb490 in php_request_shutdown (dummy=0x0) at /home/bertrand/down/php4-STABLE-200502160330/main/main.c:1004 #4 0x0811fa1f in main (argc=5, argv=0xbff00a34) at /home/bertrand/down/php4-STABLE-200502160330/sapi/cli/php_cli.c:876 (gdb)