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SubjectRe: Help track a memory leak in 2.6.0..14
Date
Arjan van de Ven wrote:
>>Who uses that memory?
>
>
> the programs
>
> slabtop
> xrestop
> cat /proc/meminfo
>
> are probably good starting points to find the leak; they give a detailed
> overview of various memory pools

Thank you for the info, I didn't know about xrestop :-)

So here is a present state of the machine:
ss ~ # date
Thu Dec 15 12:19:16 JST 2005
ss ~ # free -m
total used free shared buffers cached
Mem: 233 228 5 0 64 8
-/+ buffers/cache: 155 78
Swap: 0 0 0

ss ~ # cat /proc/meminfo
MemTotal: 239460 kB
MemFree: 5588 kB
Buffers: 66212 kB
Cached: 8920 kB
SwapCached: 0 kB
Active: 53708 kB
Inactive: 28328 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 239460 kB
LowFree: 5588 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
Mapped: 9752 kB
Slab: 148528 kB
CommitLimit: 119728 kB
Committed_AS: 16316 kB
PageTables: 260 kB
VmallocTotal: 794324 kB
VmallocUsed: 2276 kB
VmallocChunk: 791880 kB
HugePages_Total: 0
HugePages_Free: 0
Hugepagesize: 4096 kB

ss ~ # ps -A v k-size
PID TTY STAT TIME MAJFL TRS DRS RSS %MEM COMMAND
5153 tty2 Ss+ 0:01 10 515 4384 2044 0.8 -bash
4140 ? Ss 0:00 298 247 4724 860 0.3 /usr/sbin/cupsd
6572 pts/0 Ss 0:01 2 515 4124 2832 1.1 -bash
6720 pts/0 R+ 0:00 0 55 2676 760 0.3 ps -A v k-size 50
3448 ? Ss 0:00 17 133 1894 1044 0.4 /usr/sbin/cannaserver
6567 ? Ss 0:00 6 292 6087 2112 0.8 sshd: root@pts/0
4044 ? Ss 0:00 4 319 1796 736 0.3 /sbin/dhclient -cf /etc/dhcp/dhclient.co
4680 ? Ss 0:00 60 21 2146 500 0.2 login -- kalin
4485 ? Ss 0:00 3 292 3103 404 0.1 /usr/sbin/sshd
3381 ? Ss 0:00 28 100 1747 564 0.2 /usr/sbin/syslog-ng
4363 ? Ss 0:00 0 33 1694 120 0.0 /sbin/rpc.statd
4681 tty3 Ss+ 0:00 0 11 1452 64 0.0 /sbin/agetty 38400 tty3 linux
4704 tty4 Ss+ 0:00 0 11 1452 64 0.0 /sbin/agetty 38400 tty4 linux
4709 tty5 Ss+ 0:00 0 11 1452 60 0.0 /sbin/agetty 38400 tty5 linux
6015 tty1 Ss+ 0:00 1 11 1452 520 0.2 /sbin/agetty 38400 tty1 linux
4288 ? Ss 0:00 0 10 1681 116 0.0 /sbin/portmap
4714 tty6 Ss+ 0:00 0 11 1448 60 0.0 /sbin/agetty 38400 tty6 linux
841 ? S<s 0:00 1 22 1445 212 0.0 udevd
1 ? S 0:00 345 22 1441 160 0.0 init [3]
4215 ? Ss 0:07 739 16 2083 212 0.0 /usr/sbin/fnfxd
4550 ? Ss 0:00 186 9 1454 284 0.1 /usr/sbin/uptimed
2 ? SN 0:00 0 0 0 0 0.0 [ksoftirqd/0]
3 ? S< 0:00 0 0 0 0 0.0 [events/0]
4 ? S< 0:00 0 0 0 0 0.0 [khelper]
5 ? S< 0:00 0 0 0 0 0.0 [kthread]
7 ? S< 0:47 0 0 0 0 0.0 [kacpid]
95 ? S< 0:00 0 0 0 0 0.0 [kblockd/0]
134 ? S 0:00 0 0 0 0 0.0 [pdflush]
137 ? S< 0:00 0 0 0 0 0.0 [aio/0]
136 ? S 0:01 0 0 0 0 0.0 [kswapd0]
724 ? S< 0:00 0 0 0 0 0.0 [kseriod]
753 ? S< 0:00 0 0 0 0 0.0 [reiserfs/0]
1245 ? S< 0:00 0 0 0 0 0.0 [khubd]
1410 ? S 0:00 0 0 0 0 0.0 [pccardd]
1477 ? S 0:00 0 0 0 0 0.0 [pccardd]
4399 ? S< 0:01 0 0 0 0 0.0 [rpciod/0]
4400 ? S 0:00 0 0 0 0 0.0 [lockd]
5330 ? S 0:00 0 0 0 0 0.0 [pdflush]

According to slabtop:
Active / Total Objects (% used) : 1806688 / 1826914 (98.9%)
Active / Total Slabs (% used) : 36958 / 36958 (100.0%)
Active / Total Caches (% used) : 64 / 106 (60.4%)
Active / Total Size (% used) : 138777.10K / 143195.01K (96.9%)
Minimum / Average / Maximum Object : 0.02K / 0.08K / 128.00K

OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
1768936 1768884 99% 0.07K 34018 52 136072K size-64
19642 16616 84% 0.06K 322 61 1288K buffer_head
10152 4828 47% 0.14K 376 27 1504K dentry_cache

ss ~ # cat /proc/slabinfo |grep "size-64 "
size-64 1767932 1768000 76 52 1 : tunables 32 16 0 : slabdata 33999
34000 0 : globalstat 21513120 1767964 34005 0 0 1 84 0 : cpustat 614583639
1370079 612951759 1234047
ss ~ # lsmod
Module Size Used by
nfs 114540 1
lockd 66920 2 nfs
nfs_acl 3680 1 nfs
sunrpc 152004 4 nfs,lockd,nfs_acl
usbhid 27876 0
yenta_socket 26028 2
rsrc_nonstatic 14112 1 yenta_socket
ehci_hcd 33224 0
ohci_hcd 21988 0
usbcore 125660 4 usbhid,ehci_hcd,ohci_hcd
e100 37984 0
mii 5568 1 e100

OK, now stop whatever I can, unload most modules and again:

ss ~ # free -m
total used free shared buffers cached
Mem: 233 227 6 0 63 10
-/+ buffers/cache: 153 80
Swap: 0 0 0

ss ~ # ps -A v k-size
PID TTY STAT TIME MAJFL TRS DRS RSS %MEM COMMAND
5153 tty2 Ss+ 0:01 10 515 4384 2044 0.8 -bash
6572 pts/0 Ss 0:01 2 515 4124 2840 1.1 -bash
7352 pts/0 R+ 0:00 0 55 2676 756 0.3 ps -A v k-size
6567 ? Ss 0:00 6 292 6087 2112 0.8 sshd: root@pts/0
4044 ? Ss 0:00 4 319 1796 736 0.3 /sbin/dhclient -cf /etc/dhcp/dhclient.co
4680 ? Ss 0:00 60 21 2146 500 0.2 login -- kalin
4485 ? Ss 0:00 3 292 3103 404 0.1 /usr/sbin/sshd
3381 ? Ss 0:00 28 100 1747 564 0.2 /usr/sbin/syslog-ng
4681 tty3 Ss+ 0:00 0 11 1452 64 0.0 /sbin/agetty 38400 tty3 linux
4704 tty4 Ss+ 0:00 0 11 1452 64 0.0 /sbin/agetty 38400 tty4 linux
4709 tty5 Ss+ 0:00 0 11 1452 60 0.0 /sbin/agetty 38400 tty5 linux
6015 tty1 Ss+ 0:00 1 11 1452 520 0.2 /sbin/agetty 38400 tty1 linux
4714 tty6 Ss+ 0:00 0 11 1448 60 0.0 /sbin/agetty 38400 tty6 linux
841 ? S<s 0:00 1 22 1445 256 0.1 udevd
1 ? S 0:00 345 22 1441 160 0.0 init [3]
4550 ? Ss 0:00 186 9 1454 284 0.1 /usr/sbin/uptimed
2 ? SN 0:00 0 0 0 0 0.0 [ksoftirqd/0]
3 ? S< 0:00 0 0 0 0 0.0 [events/0]
4 ? S< 0:00 0 0 0 0 0.0 [khelper]
5 ? S< 0:00 0 0 0 0 0.0 [kthread]
7 ? S< 0:47 0 0 0 0 0.0 [kacpid]
95 ? S< 0:00 0 0 0 0 0.0 [kblockd/0]
134 ? S 0:00 0 0 0 0 0.0 [pdflush]
137 ? S< 0:00 0 0 0 0 0.0 [aio/0]
136 ? S 0:01 0 0 0 0 0.0 [kswapd0]
724 ? S< 0:00 0 0 0 0 0.0 [kseriod]
753 ? S< 0:00 0 0 0 0 0.0 [reiserfs/0]
1245 ? S< 0:00 0 0 0 0 0.0 [khubd]
1410 ? S 0:00 0 0 0 0 0.0 [pccardd]
1477 ? S 0:00 0 0 0 0 0.0 [pccardd]
5330 ? S 0:00 0 0 0 0 0.0 [pdflush]

ss ~ # cat /proc/slabinfo |grep "size-64 "
size-64 1770831 1770860 76 52 1 : tunables 32 16 0 : slabdata 34055
34055 0 : globalstat 21551153 1770860 34060 0 0 1 84 0 : cpustat 615607009
1372499 613972465 1236227
ss ~ # lsmod
Module Size Used by
yenta_socket 26028 2
rsrc_nonstatic 14112 1 yenta_socket
usbcore 125660 1
e100 37984 0
mii 5568 1 e100

Now, I cannot `kill -9 1410` or 1477 (the pccard) or unload yeanta_socket and rsrc_nonstatic (that
never worked).

ss ~ # reboot

Now let's how things changed... From 153MB we are back down to 14MB in use... that is a leak of more
than half my pshysical RAM...

ss ~ # free -m
total used free shared buffers cached
Mem: 233 29 204 0 3 11
-/+ buffers/cache: 14 219
Swap: 0 0 0

ss ~ # cat /proc/meminfo
MemTotal: 239460 kB
MemFree: 209544 kB
Buffers: 3324 kB
Cached: 12276 kB
SwapCached: 0 kB
Active: 14448 kB
Inactive: 5720 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 239460 kB
LowFree: 209544 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
Mapped: 7996 kB
Slab: 6564 kB
CommitLimit: 119728 kB
Committed_AS: 13456 kB
PageTables: 252 kB
VmallocTotal: 794324 kB
VmallocUsed: 2276 kB
VmallocChunk: 791880 kB
HugePages_Total: 0
HugePages_Free: 0
Hugepagesize: 4096 kB

ss ~ # lsmod
Module Size Used by
nfs 114540 1
lockd 66920 2 nfs
nfs_acl 3680 1 nfs
sunrpc 152004 4 nfs,lockd,nfs_acl
usbhid 27876 0
yenta_socket 26028 2
rsrc_nonstatic 14112 1 yenta_socket
ehci_hcd 33224 0
ohci_hcd 21988 0
usbcore 125660 4 usbhid,ehci_hcd,ohci_hcd
e100 37984 0
mii 5568 1 e100
ss ~ # cat /proc/slabinfo |grep "size-64 "
size-64 1264 1300 76 52 1 : tunables 32 16 0 : slabdata 25 25
0 : globalstat 6357 1280 31 1 0 1 84 0 : cpustat 151935 427 150804 317
ss ~ # ps -A v k-size
PID TTY STAT TIME MAJFL TRS DRS RSS %MEM COMMAND
4065 ? Ss 0:00 10 247 4724 1872 0.7 /usr/sbin/cupsd
4651 pts/0 Ss 0:00 8 515 3992 2804 1.1 -bash
4678 pts/0 R+ 0:00 0 55 2676 760 0.3 ps -A v k-size
3969 ? Ss 0:00 0 319 1796 996 0.4 /sbin/dhclient -cf /etc/dhcp/dhclient.co
4646 ? Ss 0:00 2 292 5927 2060 0.8 sshd: root@pts/0
4410 ? Ss 0:00 0 292 3103 1508 0.6 /usr/sbin/sshd
3373 ? Ss 0:00 0 133 1634 764 0.3 /usr/sbin/cannaserver
3306 ? Ss 0:00 0 100 1747 880 0.3 /usr/sbin/syslog-ng
4288 ? Ss 0:00 0 33 1698 824 0.3 /sbin/rpc.statd
4213 ? Ss 0:00 0 10 1685 648 0.2 /sbin/portmap
4619 tty3 Ss+ 0:00 0 11 1452 528 0.2 /sbin/agetty 38400 tty3 linux
4621 tty5 Ss+ 0:00 0 11 1452 528 0.2 /sbin/agetty 38400 tty5 linux
801 ? S<s 0:00 0 22 1449 480 0.2 udevd
4614 tty1 Ss+ 0:00 0 11 1448 524 0.2 /sbin/agetty 38400 tty1 linux
4618 tty2 Ss+ 0:00 0 11 1448 520 0.2 /sbin/agetty 38400 tty2 linux
4620 tty4 Ss+ 0:00 0 11 1448 524 0.2 /sbin/agetty 38400 tty4 linux
4622 tty6 Ss+ 0:00 0 11 1448 524 0.2 /sbin/agetty 38400 tty6 linux
1 ? S 0:00 16 22 1441 504 0.2 init [3]
4140 ? Ss 0:00 0 16 2083 560 0.2 /usr/sbin/fnfxd
4475 ? Ss 0:00 0 9 1450 508 0.2 /usr/sbin/uptimed
2 ? SN 0:00 0 0 0 0 0.0 [ksoftirqd/0]
3 ? S< 0:00 0 0 0 0 0.0 [events/0]
4 ? S< 0:00 0 0 0 0 0.0 [khelper]
5 ? S< 0:00 0 0 0 0 0.0 [kthread]
7 ? S< 0:00 0 0 0 0 0.0 [kacpid]
95 ? S< 0:00 0 0 0 0 0.0 [kblockd/0]
134 ? S 0:00 0 0 0 0 0.0 [pdflush]
135 ? S 0:00 0 0 0 0 0.0 [pdflush]
137 ? S< 0:00 0 0 0 0 0.0 [aio/0]
136 ? S 0:00 0 0 0 0 0.0 [kswapd0]
724 ? S< 0:00 0 0 0 0 0.0 [kseriod]
753 ? S< 0:00 0 0 0 0 0.0 [reiserfs/0]
1243 ? S< 0:00 0 0 0 0 0.0 [khubd]
1411 ? S 0:00 0 0 0 0 0.0 [pccardd]
1490 ? S 0:00 0 0 0 0 0.0 [pccardd]
4324 ? S< 0:00 0 0 0 0 0.0 [rpciod/0]
4325 ? S 0:00 0 0 0 0 0.0 [lockd]
ss ~ # uname -a
Linux ss 2.6.13.3-ss #1 Tue Oct 18 14:08:05 Local time zone must be set--see zic manu i686 Intel(R)
Pentium(R) III Mobile CPU 800MHz GenuineIntel GNU/Linux

** Hmm, have to check my timezone :-) **

So, given all this info, does anybody see anything strange? What else can I do?
Or, I should put kdb in action...
What else can I compare before and after a reboot?
Will /proc/config.gz provide any info (just trying to save bandwith, can post it anytime)?

This is a vanilla 2.6.13.3 + mppe-mppc-1.3.patch (as module), but the patch/module was never
used/loaded for this session.

NB: In this situation, X was shut down, so xrestop is irrelevant.

Thank you,
Kalin.
--
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