Two weeks since comment #4 and no errors seems like pretty good evidence that f60adf42ad55405d1b17e9e5c33fdb63f1eb8861 (ipmi: simplify locking) is root cause.
-- 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/1383921 Title: kipmi0 process hangs with ipmitool Status in “linux” package in Ubuntu: In Progress Status in “linux” source package in Precise: Invalid Status in “linux” source package in Trusty: In Progress Status in “linux” source package in Utopic: In Progress Status in “linux” source package in Vivid: In Progress Bug description: we're in the process of migrating from 12.04 to 14.04 and are noticing a problem apparently related to the kernel and ipmi. after an indeterminate period of regular ipmi queries (e.g., nagios checks using ipmitool) the kipmi0 process pegs a cpu to ~100% usage and further ipmitool commands hang. the former is not a huge problem as the process is niced and its cpu usage can be limited using the /sys/module/ipmi_si/parameters/kipmid_max_busy_us interface. however, ipmitool's hanging severely degrades hardware monitoring. this problem initially reared its head in our enviroment on a handful of 12.04 hosts on which hwe kernels were installed. of the dozen deployed 14.04 hosts, four have started displaying these symptoms in the past week. all of the 12.04+hwe hosts were eventually affected; i believe that given enough time all of the 14.04 hosts would be, as well. a reboot clears it up until its recurrence. red hat has a bug logged that appears to match this: https://bugzilla.redhat.com/show_bug.cgi?id=1090619 unfortunately the work-around and proposed fix (from a duplicate bug) are currently non- public. it does look like they were able to identify the "ipmi: simplify locking" patch from commit id f60adf42ad55405d1b17e9e5c33fdb63f1eb8861 as the culprit. i have just finished building a kernel from linux-source-3.13.0=3.13.0-37.64 w/this patch reversed and will deploy it to see if the problem is alleviated. thank you for your time and effort. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-37-generic 3.13.0-37.64 ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7 Uname: Linux 3.13.0-37-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Oct 18 13:11 seq crw-rw---- 1 root audio 116, 33 Oct 18 13:11 timer AplayDevices: aplay: device_list:268: no soundcards found... ApportVersion: 2.14.1-0ubuntu3.5 Architecture: amd64 ArecordDevices: arecord: device_list:268: no soundcards found... AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory: 'iw' Date: Tue Oct 21 12:55:43 2014 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' MachineType: Supermicro X8DT6 PciMultimedia: ProcEnviron: TERM=rxvt-unicode-256color PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/usr/bin/zsh ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-37-generic root=/dev/md0 ro consoleblank=0 console=tty0 console=ttyS2,115200n8 nomdmonddf nomdmonisw bootdegraded=true RelatedPackageVersions: linux-restricted-modules-3.13.0-37-generic N/A linux-backports-modules-3.13.0-37-generic N/A linux-firmware 1.127.7 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/15/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 2.0c dmi.board.asset.tag: 1234567890 dmi.board.name: X8DT6 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.:bvr2.0c:bd05/15/2012:svnSupermicro:pnX8DT6:pvr1234567890:rvnSupermicro:rnX8DT6:rvr1234567890:cvnSupermicro:ct17:cvr1234567890: dmi.product.name: X8DT6 dmi.product.version: 1234567890 dmi.sys.vendor: Supermicro To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1383921/+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