emalloc / erealloc again with APC

[philwo]

Hi,

I'm getting emalloc / erealloc errors in stderr.log which cause one of my vhosts not to work (I always get a 503 error). The single vhost which isn't working is serving a MediaWiki installation. The other (working) vhosts serve simple php-sites.

1) Ubuntu Dapper 6.06.1 64bit,
Linux peach 2.6.17.8 #4 Fri Aug 11 21:13:01 CEST 2006 x86_64 GNU/Linux

2) LiteSpeed 2.1.19 Standard

3) PHP 5.1.4 with LSAPI and APC 3.0.10

4) The wiki worked after I installed the LiteSpeed server (it's maybe 8 hours ago) and when I just looked, I got the 503 error. The only error-message I get is in stderr.log and says:

FATAL: erealloc(): Unable to allocate 30720 bytes
FATAL: erealloc(): Unable to allocate 30720 bytes
FATAL: emalloc(): Unable to allocate 7680 bytes
FATAL: emalloc(): Unable to allocate 7680 bytes
[...][Wed Aug 16 17:20:51 2006] [apc-error] apc_mmap: mmap failed: Cannot allocate memory
[Wed Aug 16 17:20:51 2006] [apc-error] apc_mmap: mmap failed: Cannot allocate memory
[Wed Aug 16 17:20:52 2006] [apc-error] apc_mmap: mmap failed: Cannot allocate memory
[...]
FATAL: emalloc(): Unable to allocate 7680 bytes
FATAL: emalloc(): Unable to allocate 7680 bytes
FATAL: erealloc(): Unable to allocate 30720 bytes
FATAL: erealloc(): Unable to allocate 30720 bytes

My setup is:
Server->Tuning:
Max Cached Small File Size (bytes) 4096
Total Small File Cache Size (bytes) 20M
Max MMAP File Size (bytes) 1M
Total MMAP Cache Size (bytes) 128M

Max Request Header Size (bytes) 8192
Max Request Body Size (bytes) 1G
Max Dynamic Response Header Size (bytes) 8K
Max Dynamic Response Body Size (bytes) 1G

VHost Template -> External App Definition (excerpt):
Name: $VH_NAME-php
Address: uds://tmp/lshttpd/$VH_NAME-php.sock
Max Connections: 20
Environment: PHP_LSAPI_MAX_REQUESTS=500
Instances: 20
Memory Soft Limit (bytes) 0
Memory Hard Limit (bytes) 0
Process Soft Limit 0
Process Hard Limit 0

I tried setting these limits to a very high number (memory about 160MB) instead of 0, but this didn't change anything. I restarted the server several times. If you need any more information, just tell me.

Regards,
Philipp

[xing]

Philipp,

Please try with "Server > Security > CGi Resources" memory soft/hard settings set also to "0" and/or a very high value.

Should not make a difference we want to test all scenarios to see if this is an internal config problem or an external problem.

Also make sure in php.ini that you have disabled max-memory limit option if that feature is compiled in.

[philwo]

Setting both memory limits to 0 or alternatively to soft: 200M, hard: 240M "fixes" the error, setting it to a low value like 20M brings a 503 error again! Now, is this the real solution to disable memory limits or is it still a bug but disabling the limit just hides it?

Edit: I encountered the error again during a Wordpress installation with memory limits soft: 200M, hard: 240M.
Edit 2: Sorry, this may have happened because of other memory limits set in this special VHost template.. (Edit 3, yes, it was because of these limits. Removed all memory limits but soft: 200M, hard: 240M in Server -> Security -> CGI Resources -> Memory soft/hard settings and it's still running fine)

[mistwang]

You can set the memory limit for individual external application that needs more memory.

[gboudreau]

Using LiteSpeed 2.2.2 standard, APC 3.0.12p2 and PHP 5.1.6 LSAPI.

I am also getting

FATAL: emalloc(): Unable to allocate x bytes

in my stderr.log when I have APC enabled.
This happens when I use a self-created PHP script which loads a 8MB serialized (on disk) object and plays with it. Didn't try to see what exactly in my script made it spit this error; I would guess it errors out when loading the object.
The only way I found to make it work is to disable apc in php.ini

I tried using either 0 or high values (300M/450M) as memory soft/hard limits in both Server > Security > CGI Resource and VHost > External Apps > LSAPI App, but it didn't help al all.

Thanks for any pointer on how to resolve / debug.

[mistwang]

You also need to check the memory limit set in php.ini

[gboudreau]

php.ini: memory_limit = 600M
Server > Security > CGI Resource: memory limits = 600M / 700M
VHost > External Apps > LSAPI App: memory limits = 600M / 700M

Restarted lsws to make sure the new limits were used.

Also tried 0 / 0 as memory limits.

All with same result:
FATAL: emalloc(): Unable to allocate 16 bytes
FATAL: emalloc(): Unable to allocate 16 bytes

[mistwang]

Please check your default memory limit with "ulimit -a" from command line. LSWS may not able to raise above that limit when PHP is not started in setUIDMode.

[gboudreau]

I'm using the PHP_SuEXEC template that came with 2.2.2 for this virtual host.

[root@megaone ~]# ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
max nice                        (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 8063
max locked memory       (kbytes, -l) 32
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
max rt priority                 (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 8063
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited
file locks                      (-x) unlimited

[mistwang]

Can your PHP script from command line with CLI version of PHP to make sure it is not a PHP problem?