Comment 0 for bug 720095

A simple stress test conducted on a KVM guest running standard updated Lucid with vsftpd demonstrates that memory is continuously used up until OOM Killer starts to protect the system. If test is terminated before that point is reached then memory is freed only after several hours. This does not occur with the 2.6.35 kernel (LTS backported kernel).

The test is started in this way:

$ for i in 1 2 3 4 5 6 7 8 ; do ./feedftp $i >/dev/null & done

What is observed during the test is that /proc/vmallocinfo grows continually with lines like the following being added:

0xffffe8ffff800000-0xffffe8ffffa00000 2097152 pcpu_get_vm_areas+0x0/0x790 vmalloc
0xffffe8ffffa00000-0xffffe8ffffc00000 2097152 pcpu_get_vm_areas+0x0/0x790 vmalloc
0xffffe8ffffc00000-0xffffe8ffffe00000 2097152 pcpu_get_vm_areas+0x0/0x790 vmalloc

Attached:

   - test script (see feedftp)
   - tarball containing the file at various times during the test (see vmallocinfo.32.tar)
   - dmesg output showing OOM Killer at work (see dmesg-oom.32.txt)

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-28-server (not installed)
Regression: No
Reproducible: Yes
ProcVersionSignature: User Name 2.6.32-28.55-server 2.6.32.27+drm33.12
Uname: Linux 2.6.32-28-server x86_64
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
CurrentDmesg: [ 12.360149] eth0: no IPv6 routers present
Date: Wed Feb 16 14:00:19 2011
Lspci: Error: [Errno 2] No such file or directory
Lsusb: Error: [Errno 2] No such file or directory
MachineType: Bochs Bochs
PciMultimedia:

ProcCmdLine: root=UUID=7bbf58be-9c5f-4113-ad1b-4611fd131d33 ro
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux
dmi.bios.date: 01/01/2007
dmi.bios.vendor: Bochs
dmi.bios.version: Bochs
dmi.chassis.type: 1
dmi.chassis.vendor: Bochs
dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2007:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr:
dmi.product.name: Bochs
dmi.sys.vendor: Bochs