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[2005-03-09 16:16 UTC] antoine dot bajolet at tdf dot fr
Description:
------------
It seems that there is a memory leak in fopen wrappers to HTTP.
With a minimal compilation of PHP :
./configure --disable-all --enable-sockets --without-pear --enable-memory-limit --without-pcre-regex --without-mysql
And the first code above, the memory used increased continuously.
(the -n flag is used to ignore any php.ini script. All parameters are default).
#sapi/cli/php -n script1.php
12160
13536
13672
13736
13800
13864
13928
13992
14056
14120
14184
... still increasing
With a classic fopen, works fine
#sapi/cli/php -n script2.php
12128
12320
12336
12336
12336
12336
12336
12336
12336
12336
12336
... still stable
This is very annoying because we are writing a small php daemon using periodics requests on HTTP hosts.
For more infos :
#ldd sapi/cli/php libcrypt.so.1 => /lib/libcrypt.so.1 (0x4001b000)
libresolv.so.2 => /lib/libresolv.so.2 (0x40049000)
libm.so.6 => /lib/i686/libm.so.6 (0x4005b000)
libdl.so.2 => /lib/libdl.so.2 (0x4007d000)
libnsl.so.1 => /lib/libnsl.so.1 (0x40081000)
libc.so.6 => /lib/i686/libc.so.6 (0x40096000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
/lib/libcrypt.so.1 -> libcrypt-2.3.2.so
/lib/libresolv.so.2 -> libresolv-2.3.2.so
Regards
Antoine Bajolet
Reproduce code:
---------------
With this, memory problem :
<?php
/* script1.php */
while(true){
echo memory_get_usage()."\n";
$handler = fopen('http://some.thing/','r');
fclose($handler);
sleep(2);
} // while
?>
With this, no memory problem
<?php
/* script2.php */
while(true){
echo memory_get_usage()."\n";
$handler = fopen('/etc/hosts','r');
fclose($handler);
sleep(2);
} // while
?>
Expected result:
----------------
The memory used has to be stable, not increasing.
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Last updated: Fri Oct 31 00:00:01 2025 UTC |
Problem still persists with : - RH9 glibc update (glibc-2.3.2-27.9.7) - Php4 stable snapshot (php4-STABLE-200503111130) OR php-5.0.3. It seems not to be the resolve part of the wrapper : same test script with a simple gethostbyname() don't leaks memory. Here is a strace of one loop (if it helps) nanosleep({2, 0}, {2, 0}) = 0 write(1, "14264\n", 614264 ) = 6 socket(PF_UNIX, SOCK_STREAM, 0) = 3 connect(3, {sa_family=AF_UNIX, path="/var/run/.nscd_socket"}, 110) = -1 ENOENT (No such file or directory) close(3) = 0 open("/etc/hosts", O_RDONLY) = 3 fcntl64(3, F_GETFD) = 0 fcntl64(3, F_SETFD, FD_CLOEXEC) = 0 fstat64(3, {st_mode=S_IFREG|0644, st_size=160, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40016000 read(3, "127.0.0.1 localhost"..., 4096) = 160 read(3, "", 4096) = 0 close(3) = 0 munmap(0x40016000, 4096) = 0 socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3 connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("32.2.32.10")}, 28) = 0 send(3, "\257\1\1\0\0\1\0\0\0\0\0\0\5rpnet\10intranet\3tdf\2"..., 39, 0) = 39 gettimeofday({1110548703, 854413}, NULL) = 0 poll([{fd=3, events=POLLIN, revents=POLLIN}], 1, 5000) = 1 ioctl(3, FIONREAD, [123]) = 0 recvfrom(3, "\257\1\205\200\0\1\0\2\0\1\0\1\5rpnet\10intranet\3tdf\2"..., 1024, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("32.2.32.10")}, [16]) = 123 close(3) = 0 socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3 connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("32.23.32.105")}, 16) = 0 send(3, "GET / HTTP/1.0\r\n", 16, 0) = 16 send(3, "Host: rpnet.intranet.tdf.fr\r\n", 29, 0) = 29 send(3, "\r\n", 2, 0) = 2 select(4, [3], NULL, NULL, {0, 0}) = 0 (Timeout) select(4, [3], NULL, NULL, {60, 0}) = 1 (in [3], left {59, 940000}) recv(3, "HTTP/1.1 200 OK\r\nDate: Fri, 11 M"..., 8192, 0) = 1448 close(3) = 0 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0 rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 nanosleep({2, 0}, <unfinished ...> Can it be a bug of gcc (mdk8.1 -> 2.96, RH9 -> 3.2.2) ?