I'm not sure if this is a UML issue, but my machine is acting very strange, so I'm wondering if it is.
I have a guest that has 512Mb of memory assigned to it. After running
mysql, apache, and mongrel (ruby on rails application server) for
several days, the machine has killed off mysql and mongrel (as well as
several apache children) because it is running out of ram. Usage of the
command "free -m" confirms that this is the case:
total used free shared buffers
cached
Mem: 499 495 3 0 0
5
-/+ buffers/cache: 489 10
Swap: 1907 2 1904
Usage of top, however, shows that there isn't any process using anywhere
near that kind of RAM (see the end of the message for top output).
I am confused as to what is going on. Could the UML kernel be leaking
memory? Is it possible my machine got rooted (running ubuntu gutsy and
stay up to date on security updates so that seems unlikely)?
For reference, I am running a vanilla Ubuntu gutsy server install on the
host, and kernel version 2.6.23 on the guest (precompiled kernel
downloaded from uml.nagafix.co.uk). The guest is also running a vanilla
ubuntu gutsy server install.
I hope you can provide some advice as to more diagnostics to run. I
have rebooted the machine, but this is the second time this has
happened, so I think it will happen again. Note that the guest would
not restart with a "shutdown -r now" command and instead hung with the
terminal output "Deactivating swap..." I had to kill off the guest from
the host and restart. Note also that this host runs many other guests
off the same kernel (although this is the only one running mongrel) and
I haven't seen this behavior on any of them except this one.
Jonas
It should be mentioned that although this top output does not show it,
there were two zombie processes present (mysqd and logger) that were
both children of mysql-safe until I killed mysql-safe to see if the
memory would come back.
top - 12:51:18 up 19 days, 19:18, 2 users, load average: 0.00, 0.00,
0.03
Tasks: 28 total, 1 running, 27 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si,
0.0%st
Mem: 511248k total, 507600k used, 3648k free, 636k buffers
Swap: 1953116k total, 2804k used, 1950312k free, 6132k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
1 root 20 0 2284 116 68 S 0.0 0.0 0:00.13
init
2 root 15 -5 0 0 0 S 0.0 0.0 0:00.00
kthreadd
3 root 15 -5 0 0 0 S 0.0 0.0 0:00.00
ksoftirqd/0
4 root RT -5 0 0 0 S 0.0 0.0 0:00.00
watchdog/0
5 root 15 -5 0 0 0 S 0.0 0.0 0:00.00
events/0
6 root 15 -5 0 0 0 S 0.0 0.0 0:00.00
khelper
40 root 15 -5 0 0 0 S 0.0 0.0 0:00.16
kblockd/0
42 root 15 -5 0 0 0 S 0.0 0.0 0:00.00
cqueue/0
62 root 15 -5 0 0 0 S 0.0 0.0 0:06.91
kswapd0
111 root 15 -5 0 0 0 S 0.0 0.0 0:00.00
aio/0
125 root 15 -5 0 0 0 S 0.0 0.0 0:00.00
cifsoplockd
126 root 15 -5 0 0 0 S 0.0 0.0 0:00.00
cifsdnotifyd
136 root 15 -5 0 0 0 S 0.0 0.0 0:00.00
cryptd
708 root 15 -5 0 0 0 S 0.0 0.0 0:00.00
rpciod/0
797 root 15 -5 0 0 0 S 0.0 0.0 0:02.61
kjournald
916 root 16 -4 2316 4 0 S 0.0 0.0 0:00.19
udevd
919 root 20 0 2044 4 0 S 0.0 0.0 0:00.02
udevmonitor
1299 root 18 -2 2316 4 0 S 0.0 0.0 0:00.01
udevd
1961 root 20 0 1692 4 0 S 0.0 0.0 0:00.00
getty
2037 root 20 0 5280 260 168 S 0.0 0.1 0:00.37
sshd
2540 root 20 0 1692 4 0 S 0.0 0.0 0:00.00
getty
3159 root 20 0 3548 192 124 S 0.0 0.0 0:00.74
cron
23749 root 20 0 0 0 0 S 0.0 0.0 0:00.00
pdflush
23872 root 20 0 0 0 0 S 0.0 0.0 0:00.00
pdflush
23904 root 20 0 8032 1524 1144 S 0.0 0.3 0:00.01
sshd
23906 jmeyer 20 0 8180 1324 880 S 0.0 0.3 0:00.06
sshd
23907 jmeyer 20 0 5808 2416 1360 S 0.0 0.5 0:00.12
bash
24093 jmeyer 20 0 2364 1104 876 R 0.0 0.2 0:00.00 top
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