Messages in this thread | | | Subject | Tracking down a memory leak | From | Marco Colombo <> | Date | Mon, 20 Jun 2005 12:33:12 +0200 |
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Hi, today I've found a server in a OOM condition, the funny thing is that after some investigation I've found no process that has mem allocated to. I even switched to single user, here's what I've found:
sh-2.05b# ps axu; free USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.0 0.0 2708 432 ? S May16 0:10 init [S] root 2 0.0 0.0 0 0 ? SWN May16 0:03 [ksoftirqd/0] root 3 0.0 0.0 0 0 ? SW< May16 1:49 [events/0] root 4 0.0 0.0 0 0 ? SW< May16 0:00 [khelper] root 16 0.0 0.0 0 0 ? SW< May16 0:00 [kacpid] root 87 0.0 0.0 0 0 ? SW< May16 0:33 [kblockd/0] root 95 0.0 0.0 0 0 ? SW May16 0:00 [khubd] root 152 0.0 0.0 0 0 ? SW< May16 0:00 [aio/0] root 151 0.0 0.0 0 0 ? SW May16 45:44 [kswapd0] root 245 0.0 0.0 0 0 ? SW May16 0:00 [kseriod] root 473 0.0 0.0 0 0 ? SW May16 0:00 [md7_raid1] root 475 0.0 0.0 0 0 ? SW May16 0:11 [md6_raid1] root 477 0.0 0.0 0 0 ? SW May16 0:00 [md5_raid1] root 479 0.0 0.0 0 0 ? SW May16 0:00 [md4_raid1] root 481 0.0 0.0 0 0 ? SW May16 0:00 [md3_raid1] root 483 0.0 0.0 0 0 ? SW May16 0:08 [md2_raid1] root 485 0.0 0.0 0 0 ? SW May16 0:00 [md1_raid1] root 486 0.0 0.0 0 0 ? SW May16 0:02 [md0_raid1] root 487 0.0 0.0 0 0 ? SW May16 0:38 [kjournald] root 690 0.0 0.0 0 0 ? SW May16 0:03 [kjournald] root 691 0.0 0.0 0 0 ? SW May16 4:05 [kjournald] root 692 0.0 0.0 0 0 ? SW May16 0:03 [kjournald] root 693 0.0 0.0 0 0 ? SW May16 0:03 [kjournald] root 694 0.0 0.0 0 0 ? SW May16 0:03 [kjournald] root 695 0.0 0.0 0 0 ? SW May16 6:14 [kjournald] root 696 0.0 0.0 0 0 ? SW May16 0:00 [kjournald] root 16545 0.0 0.0 0 0 ? SW 11:47 0:00 [pdflush] root 16551 0.0 0.0 0 0 ? SW 11:47 0:00 [pdflush] root 16889 0.0 0.0 3072 744 ? S 11:59 0:00 minilogd root 17235 0.0 0.0 2708 444 ttyS0 S 12:00 0:00 init [S] root 17236 0.0 0.1 3176 1180 ttyS0 S 12:00 0:00 /bin/sh root 17248 0.0 0.0 2732 748 ttyS0 R 12:07 0:00 ps axu total used free shared buffers cached Mem: 1035812 898524 137288 0 3588 16732 -/+ buffers/cache: 878204 157608 Swap: 1049248 788 1048460 sh-2.05b# uptime 12:13:28 up 35 days, 1:48, 0 users, load average: 0.00, 0.59, 16.13 sh-2.05b# uname -a Linux xxxx.example.org 2.6.10-1.12_FC2.marco #1 Mon Feb 7 14:53:42 CET 2005 i686 athlon i386 GNU/Linux
I know this is an old Fedora Core 2 kernel, eventually I'll bring the issue on thier lists. An upgrade has already been scheduled for this host, so I'm not really pressed in tracking this specific bug (unless it occurs on the new system, of course).
Anyway, I just wonder if generally there's a way to find out where those 850+ MBs are allocated. Since there are no big user processes, I'm assuming it's a memory leak in kernel space. I'm curious, this is the first time I see something like this. Any suggestion what to look at besides 'ps' and 'free'?
The server has been mainly running PostgreSQL at a fairly high load for the last 35 days, BTW.
TIA, .TM. -- ____/ ____/ / / / / Marco Colombo ___/ ___ / / Technical Manager / / / ESI s.r.l. _____/ _____/ _/ Colombo@ESI.it
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