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From Alvise Nicoletti <li...@alvisenicoletti.com>
Subject [users@httpd] memory problems, I lose control of the entire server
Date Sun, 28 Feb 2010 17:24:00 GMT
Hi.
I searched help from several months ago with no success.
So I'll repeat again my problem hoping that this time someone will answer.

I often (3 times in a month) control of my virtual server, so I have to 
call the provider to soft-reset it.
The problem is that apache takes all the memory and the cpu usage of the 
server, and sometimes after that I have also kernel panic errors.

Even with the server working, I have the apache2 daemons big from 30 to 
50 megabytes each one (now I use 9).


In the logs I found stuff like this:
Feb 28 12:54:09 utopia kernel: [408986.594006] apache2 invoked 
oom-killer: gfp_mask=0x1201d2, order=0, oomkilladj=0
Feb 28 12:54:09 utopia kernel: [408986.594022] Pid: 6817, comm: apache2 
Not tainted 2.6.28-18-server #59-Ubuntu
Feb 28 12:54:09 utopia kernel: [408986.594026] Call Trace:
Feb 28 12:54:09 utopia kernel: [408986.594080]  [<ffffffff802b3825>] 
oom_kill_process+0x95/0x240
Feb 28 12:54:09 utopia kernel: [408986.594087]  [<ffffffff802b3fdf>] ? 
select_bad_process+0xef/0x130
Feb 28 12:54:09 utopia kernel: [408986.594091]  [<ffffffff802b40d4>] 
out_of_memory+0xb4/0x150
Feb 28 12:54:09 utopia kernel: [408986.594095]  [<ffffffff802b6c49>] 
__alloc_pages_internal+0x4a9/0x4f0
Feb 28 12:54:09 utopia kernel: [408986.594101]  [<ffffffff802b9a7a>] 
__do_page_cache_readahead+0xda/0x210
Feb 28 12:54:09 utopia kernel: [408986.594105]  [<ffffffff802b9c0e>] 
do_page_cache_readahead+0x5e/0x90
Feb 28 12:54:09 utopia kernel: [408986.594108]  [<ffffffff802b201a>] 
filemap_fault+0x34a/0x430
Feb 28 12:54:09 utopia kernel: [408986.594113]  [<ffffffff802c6010>] 
__do_fault+0x50/0x520
Feb 28 12:54:09 utopia kernel: [408986.594117]  [<ffffffff802c7199>] 
handle_mm_fault+0x1e9/0x470
Feb 28 12:54:09 utopia kernel: [408986.594134]  [<ffffffff802f3a1f>] ? 
path_walk+0xbf/0xd0
Feb 28 12:54:09 utopia kernel: [408986.594158]  [<ffffffff8022f669>] ? 
default_spin_lock_flags+0x9/0x10
Feb 28 12:54:09 utopia kernel: [408986.594177]  [<ffffffff8069e0d7>] 
do_page_fault+0x307/0x780
Feb 28 12:54:09 utopia kernel: [408986.594183]  [<ffffffff802eb9f3>] ? 
cp_new_stat+0xe3/0xf0
Feb 28 12:54:09 utopia kernel: [408986.594186]  [<ffffffff802ebee6>] ? 
sys_newstat+0x36/0x50
Feb 28 12:54:09 utopia kernel: [408986.594198]  [<ffffffff8069b6ba>] 
error_exit+0x0/0x70
Feb 28 12:54:09 utopia kernel: [408986.594202] Mem-Info:
Feb 28 12:54:09 utopia kernel: [408986.594205] DMA per-cpu:
Feb 28 12:54:09 utopia kernel: [408986.594207] CPU    0: hi:    0, 
btch:   1 usd:   0
Feb 28 12:54:09 utopia kernel: [408986.594210] CPU    1: hi:    0, 
btch:   1 usd:   0
Feb 28 12:54:09 utopia kernel: [408986.594212] DMA32 per-cpu:
Feb 28 12:54:09 utopia kernel: [408986.594214] CPU    0: hi:  186, 
btch:  31 usd: 183
Feb 28 12:54:09 utopia kernel: [408986.594216] CPU    1: hi:  186, 
btch:  31 usd: 172
Feb 28 12:54:09 utopia kernel: [408986.594226] Active_anon:363780 
active_file:19 inactive_anon:121250
Feb 28 12:54:09 utopia kernel: [408986.594228]  inactive_file:91 
unevictable:0 dirty:0 writeback:0 unstable:0
Feb 28 12:54:09 utopia kernel: [408986.594229]  free:3066 slab:4774 
mapped:1 pagetables:7473 bounce:0
Feb 28 12:54:09 utopia kernel: [408986.594234] DMA free:6644kB min:12kB 
low:12kB high:16kB active_anon:0kB inactive_anon:0kB acti$
Feb 28 12:54:09 utopia kernel: [408986.594237] lowmem_reserve[]: 0 2004 
2004 2004
Feb 28 12:54:09 utopia kernel: [408986.594244] DMA32 free:5620kB 
min:5720kB low:7148kB high:8580kB active_anon:1455120kB inactive$
Feb 28 12:54:09 utopia kernel: [408986.594247] lowmem_reserve[]: 0 0 0 0
Feb 28 12:54:09 utopia kernel: [408986.594259] DMA: 3*4kB 3*8kB 3*16kB 
3*32kB 3*64kB 1*128kB 2*256kB 1*512kB 1*1024kB 0*2048kB 1*$
Feb 28 12:54:09 utopia kernel: [408986.594272] DMA32: 155*4kB 1*8kB 
0*16kB 0*32kB 0*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 0*2048k$
Feb 28 12:54:09 utopia kernel: [408986.594284] 828 total pagecache pages
Feb 28 12:54:09 utopia kernel: [408986.594286] 0 pages in swap cache
Feb 28 12:54:09 utopia kernel: [408986.594288] Swap cache stats: add 
4551, delete 4551, find 160864/160937
Feb 28 12:54:09 utopia kernel: [408986.594297] Free swap  = 0kB
Feb 28 12:54:09 utopia kernel: [408986.594299] Total swap = 0kB
Feb 28 12:54:09 utopia kernel: [408986.608274] 524272 pages RAM
Feb 28 12:54:09 utopia kernel: [408986.608283] 15596 pages reserved
Feb 28 12:54:09 utopia kernel: [408986.608284] 63040 pages shared
Feb 28 12:54:09 utopia kernel: [408986.608286] 500299 pages non-shared
Feb 28 12:54:09 utopia kernel: [408986.608292] Out of memory: kill 
process 6817 (apache2) score 63892 or a child
Feb 28 12:54:09 utopia kernel: [408986.609426] Killed process 6817 (apache2)
Feb 28 12:54:17 utopia kernel: [409094.110911] pickup invoked 
oom-killer: gfp_mask=0x1201d2, order=0, oomkilladj=0
Feb 28 12:54:17 utopia kernel: [409094.110925] Pid: 5668, comm: pickup 
Not tainted 2.6.28-18-server #59-Ubuntu
Feb 28 12:54:17 utopia kernel: [409094.110929] Call Trace:
(and so on)

This is my configuration:
Linux utopia 2.6.28-18-server #59-Ubuntu SMP Thu Jan 28 02:25:03 UTC 
2010 x86_64 GNU/Linux
Server version: Apache/2.2.11 (Ubuntu)
Server built:   Nov 13 2009 22:06:57
Server's Module Magic Number: 20051115:21
Server loaded:  APR 1.2.12, APR-Util 1.2.12
Compiled using: APR 1.2.12, APR-Util 1.2.12
Architecture:   64-bit
Server MPM:     Prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APACHE_MPM_DIR="server/mpm/prefork"
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=128
 -D HTTPD_ROOT=""
 -D SUEXEC_BIN="/usr/lib/apache2/suexec"
 -D DEFAULT_PIDLOG="/var/run/apache2.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_LOCKFILE="/var/run/apache2/accept.lock"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="/etc/apache2/mime.types"
 -D SERVER_CONFIG_FILE="/etc/apache2/apache2.conf"

This is the main configuration of apache2:
<IfModule mpm_prefork_module>
    StartServers          5
    MinSpareServers       5
    MaxSpareServers      9
    MaxClients          80
    MaxRequestsPerChild   400
    MaxMemFree  200000
</IfModule>

KeepAliveTimeout 3
MaxKeepAliveRequests 50
KeepAlive On
Timeout 200

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