I've found the cause.
Some file of the apache module mod-security had grown excessively.
Code:
:lsof -p 26064
apache2 26064 www-data 15u REG 252,4 536576 56 /var/log/modsecurity/data/resource.dir
apache2 26064 www-data 16u REG 252,4 6238929920 57 /var/log/modsecurity/data/resource.pag
This is how the output of atop now looks like:
Code:
ATOP - www 2011/10/17 14:31:19 4 seconds elapsed
PRC | sys 0.13s | user 1.84s | #proc 230 | #zombie 1 | #exit 4 |
CPU | sys 3% | user 45% | irq 0% | idle 752% | wait 1% |
cpu | sys 1% | user 8% | irq 0% | idle 91% | cpu005 w 0% |
cpu | sys 1% | user 10% | irq 0% | idle 89% | cpu000 w 0% |
cpu | sys 0% | user 8% | irq 0% | idle 92% | cpu003 w 0% |
cpu | sys 0% | user 8% | irq 0% | idle 92% | cpu006 w 0% |
cpu | sys 0% | user 5% | irq 0% | idle 95% | cpu001 w 0% |
cpu | sys 0% | user 4% | irq 0% | idle 95% | cpu002 w 1% |
cpu | sys 0% | user 3% | irq 0% | idle 97% | cpu004 w 0% |
cpu | sys 0% | user 0% | irq 0% | idle 100% | cpu007 w 0% |
CPL | avg1 0.23 | avg5 0.20 | avg15 0.17 | csw 1704 | intr 1920 |
MEM | tot 7.8G | free 3.6G | cache 1.1G | buff 300.9M | slab 97.0M |
SWP | tot 7.4G | free 5.0G | | vmcom 7.5G | vmlim 11.4G |
DSK | sdb | busy 1% | read 4 | write 13 | avio 1 ms |
DSK | sda | busy 0% | read 0 | write 6 | avio 0 ms |
NET | transport | tcpi 340 | tcpo 248 | udpi 0 | udpo 0 |
NET | network | ipi 366 | ipo 248 | ipfrw 0 | deliv 340 |
NET | eth0 0% | pcki 335 | pcko 348 | si 97 Kbps | so 643 Kbps |
NET | lo ---- | pcki 32 | pcko 32 | si 5 Kbps | so 5 Kbps |
PID SYSCPU USRCPU VGROW RGROW RDDSK WRDSK ST EXC S CPU CMD 1/2
1605 0.00s 0.31s 0K 0K 16K 52K -- - S 8% mysqld
29632 0.00s 0.21s 256K 96K 0K 0K -- - S 5% apache2
29584 0.00s 0.16s 0K 0K 0K 0K -- - S 4% apache2
29686 0.00s 0.15s 68K 348K 0K 0K -- - S 4% apache2
29636 0.01s 0.11s -448K -364K 0K 0K -- - S 3% apache2
29633 0.00s 0.12s 0K 40K 0K 4K -- - S 3% apache2
29693 0.01s 0.10s -256K -236K 0K 4K -- - S 3% apache2
29570 0.00s 0.10s 768K 768K 0K 0K -- - S 2% apache2
29601 0.01s 0.06s 0K 0K 0K 0K -- - S 2% apache2
29624 0.01s 0.06s 0K 0K 0K 0K -- - S 2% apache2
29503 0.00s 0.06s 0K 0K 0K 0K -- - S 1% apache2
29676 0.00s 0.06s 256K 256K 0K 0K -- - S 1% apache2
29620 0.00s 0.06s 0K 0K 0K 8K -- - S 1% apache2
29611 0.01s 0.05s 0K 0K 0K 0K -- - S 1% apache2
29684 0.01s 0.05s -448K -380K 0K 0K -- - S 1% apache2
29564 0.00s 0.05s -768K -768K 0K 0K -- - S 1% apache2
29695 0.00s 0.04s 0K 0K 0K 0K -- - S 1% apache2
29483 0.00s 0.03s 0K 4K 0K 0K -- - S 1% apache2
29689 0.00s 0.03s 0K 0K 0K 0K -- - S 1% apache2
29384 0.03s 0.00s 0K 0K 0K 0K -- - R 1% atop
29535 0.02s 0.00s -0.3G -19.1M 0K 0K -- - Z 0% apache2
29648 0.00s 0.01s 0K 0K 0K 4K -- - S 0% apache2
29690 0.00s 0.01s 0K 0K 0K 0K -- - S 0% apache2
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