Edit report at http://bugs.php.net/bug.php?id=52312&edit=1
ID: 52312 Updated by: paj...@php.net Reported by: v dot damore at gmail dot com Summary: PHP lstat problem -Status: Bogus +Status: Feedback Type: Bug Package: Safe Mode/open_basedir Operating System: Linux PHP Version: 5.2.13 New Comment: Can you try with 5.3 please? Previous Comments: ------------------------------------------------------------------------ [2010-07-12 17:51:24] v dot damore at gmail dot com I tried again with a simple script test.php '<? echo "Ciao" ?>' realpath_cache_size=1024k realpath_cache_ttl=600 I have always same behavior (also second and following times I try to call curl http://damorealt.xoom.it/test.php: 13692 chdir("/usr/local/myspace/webspace/httpdocs") = 0 13692 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace/webspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace/webspace/httpdocs", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace/webspace/httpdocs/test.php", {st_mode=S_IFREG|0644, st_size=19, ...}) = 0 13692 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace/webspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace/webspace/httpdocs", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace/webspace/httpdocs/test.php", {st_mode=S_IFREG|0644, st_size=19, ...}) = 0 13692 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace/webspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace/webspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace/webspace/httpdocs", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 13692 lstat("/usr/local/myspace/webspace/httpdocs/test.php", {st_mode=S_IFREG|0644, st_size=19, ...}) = 0 13692 open("/usr/local/myspace/webspace/httpdocs/test.php", O_RDONLY) = 16 13692 fstat(16, {st_mode=S_IFREG|0644, st_size=19, ...}) = 0 13692 read(16, "<? echo \"Ciao!\" ?>\n", 8192) = 19 13692 read(16, "", 8192) = 0 13692 read(16, "", 8192) = 0 13692 close(16) = 0 13692 chdir("/") = 0 ------------------------------------------------------------------------ [2010-07-12 17:07:40] ras...@php.net phpinfo() is a special case. Try it with a simple hello world script. ------------------------------------------------------------------------ [2010-07-12 16:56:36] v dot damore at gmail dot com The real problem is that such full scan are repeated more then once: 25933 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace/webspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace/webspace/httpdocs", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace/webspace/httpdocs/phpinfo.php", {st_mode=S_IFREG|0644, st_size=16, ...}) = 0 First check 25933 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace/webspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace/webspace/httpdocs", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace/webspace/httpdocs/phpinfo.php", {st_mode=S_IFREG|0644, st_size=16, ...}) = 0 Second check 25933 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace/webspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 Third check (incomplete) 25933 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace/webspace", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace/webspace/httpdocs", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 25933 lstat("/usr/local/myspace/webspace/httpdocs/phpinfo.php", {st_mode=S_IFREG|0644, st_size=16, ...}) = 0 Final check and then read the file. 25933 open("/usr/local/myspace/webspace/httpdocs/phpinfo.php", O_RDONLY) = 16 25933 fstat(16, {st_mode=S_IFREG|0644, st_size=16, ...}) = 0 25933 read(16, "<? phpinfo() ?>\n", 8192) = 16 25933 read(16, "", 8192) = 0 25933 read(16, "", 8192) = 0 25933 close(16) = 0 ------------------------------------------------------------------------ [2010-07-12 16:35:46] paj...@php.net The scan of each element of the paths happen anyway, whether the paths contain symlinks or not. Check the code TSRM/ for a deeper explanation. ------------------------------------------------------------------------ [2010-07-12 15:57:54] v dot damore at gmail dot com @pajoye; as is described in "Actual result" part of this bug, first time PHP engine check filepath there is a full scan of all directories at least 4 times before cache the result, this behavior anyway cannot scale in a so large environment. @rasmus: this is very interesting, I can consider upgrade to 5.3 in order to avoid this behavior. I know this is an extrema ratio: may I disable symlinks support from PHP engine in order to avoid this behavior? Is there an answer regarding the increase of realpath_cache_size realpath_cache_ttl? ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/bug.php?id=52312 -- Edit this bug report at http://bugs.php.net/bug.php?id=52312&edit=1
