[Expired for linux (Ubuntu) because there has been no activity for 60 days.]
** Changed in: linux (Ubuntu) Status: Incomplete => Expired -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1098342 Title: out of memory errors when performing I/O on a system with large amount of RAM and 32-bit pae kernel Status in “linux” package in Ubuntu: Expired Bug description: We have a system with 64GB of RAM which we have to run with a 32-bit installation for various reasons. When performing I/O on that system, we suddenly get "Out of memory" errors, and if I/O is fast enough (i.e. cat /dev/zero > /dev/shm/somefile), the system becomes unusable very quickly. The following list of example commands will cause an OOM condition at various speeds: # Causes OOM and complete denial of service within 10-15 seconds: cat /dev/zero > /dev/shm/somefile # Causes OOM and complete denial of service within 30 - 40 seconds: cat /dev/zero > /dev/shm # Causes sporadic OOM errors: cat /dev/sda > /dev/sdb The /dev/sda and /dev/sdb devices read and write sequentially at about 150MB/s. The same error was reproduced with the newest upstream 32-bit pae kernels from 12.10 (quantal) and 13.04 (raring). Also, the same was reproduced with Debian Queeze 32-bit kernel (2.6.32) installed on Ubuntu 12.04. The error appears to be absent in 64-bit kernels (installed instead of the 32-bit kernel on the same 32-bit Ubuntu 12.04 installation). Please see attached an example of OOM and DoS that was caused with "cat /dev/shm > /dev/shm/somefile" in the out_of_memory_errors.txt attachment. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.2.0-35-generic-pae 3.2.0-35.55 ProcVersionSignature: Ubuntu 3.2.0-35.55-generic-pae 3.2.34 Uname: Linux 3.2.0-35-generic-pae i686 AlsaDevices: total 0 crw-rw---T 1 root audio 116, 1 Jan 10 15:55 seq crw-rw---T 1 root audio 116, 33 Jan 10 15:55 timer AplayDevices: aplay: device_list:252: no soundcards found... ApportVersion: 2.0.1-0ubuntu14 Architecture: i386 ArecordDevices: arecord: device_list:252: no soundcards found... AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. CurrentDmesg: [ 11.884916] NFSD: starting 90-second grace period [ 18.448013] eth0: no IPv6 routers present Date: Thu Jan 10 16:10:40 2013 IwConfig: Error: [Errno 2] No such file or directory MachineType: Supermicro H8DGU PciMultimedia: ProcEnviron: TERM=xterm PATH=(custom, no user) SHELL=/bin/bash ProcFB: ProcKernelCmdLine: root=/dev/sda1 ro PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-3.2.0-35-generic-pae N/A linux-backports-modules-3.2.0-35-generic-pae N/A linux-firmware 1.79.1 RfKill: Error: [Errno 2] No such file or directory SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) WifiSyslog: dmi.bios.date: 12/10/10 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1.1 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: H8DGU dmi.board.vendor: Supermicro dmi.board.version: 1234567890 dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 17 dmi.chassis.vendor: Supermicro dmi.chassis.version: 1234567890 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.1:bd12/10/10:svnSupermicro:pnH8DGU:pvr1234567890:rvnSupermicro:rnH8DGU:rvr1234567890:cvnSupermicro:ct17:cvr1234567890: dmi.product.name: H8DGU dmi.product.version: 1234567890 dmi.sys.vendor: Supermicro To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1098342/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp