I got similar problems (shutdown hanging, mount:/ is busy) with Ubuntu 14.04 on a Dell Precision WorkStation 390, after boot ing dmesg displayed a kernel 'Oops: 0000 [#1] SMP', a few lines below the 'i82975x_edac' is listed:
[ 7.951808] Oops: 0000 [#1] SMP [ 7.951943] Modules linked in: i82975x_edac(+) snd edac_core serio_raw soundcore mac_hid hid_generic usbhid hid ahci firewire_ohci libahci firewire_core crc_itu_t floppy tg3 ptp pps_core [ 7.952012] CPU: 0 PID: 309 Comm: systemd-udevd Not tainted 3.13.0-36-generic #63-Ubuntu [ 7.952012] Hardware name: Dell Inc. Precision WorkStation 390 /0DN075, BIOS 2.6.0 05/19/2008 [ 7.952012] task: ffff88007b988000 ti: ffff8800796e8000 task.ti: ffff8800796e8000 [ 7.952012] RIP: 0010:[<ffffffffa00c97ee>] [<ffffffffa00c97ee>] edac_create_sysfs_mci_device+0x23e/0x550 [edac_core] I blacklisted the i82975x_edac module and voila, the machine shuts down without problems. See also my bug: https://bugs.launchpad.net/ubuntu/+source/pm-utils/+bug/1372006 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to pm-utils in Ubuntu. https://bugs.launchpad.net/bugs/1263704 Title: pci_devices does not terminate at computer shutdown Status in “pm-utils” package in Ubuntu: Confirmed Bug description: I have a clean install of 13.10 using the 3.11 kernel. I have previously reported this bug with the 2.12 kernel (Bug #1261898), when I used apportcollect it instructed me to use standard Kernel and re- report if bug persists; it does... When I shutdown or restart the process hangs. I press a key and I see: **Killing all remaining processes ....... [fail]** (fail is in red) This is followed by more info (sometime referring to nm-dispatcher or modem and always ends: mount:/ is busy will now restart (or halt as the case may be) Then nothing else happens the process hangs there, power on my PC (Dell 5150 desktop) remains on and I need to do a "hard reset" to turn my PC off. I have seen relatively similar problems but none match mine exactly, I have attempted using: sudo shutdown -P now or sudo shutdown -H now or sudo reboot But the results are the same. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: pm-utils 1.4.1-12ubuntu1 ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7 Uname: Linux 3.11.0-14-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.12.5-0ubuntu2.2 Architecture: amd64 Date: Mon Dec 23 14:15:34 2013 ExecutablePath: /usr/lib/pm-utils/power.d/pci_devices InstallationDate: Installed on 2013-10-19 (64 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) InterpreterPath: /bin/dash MarkForUpload: True OmitPids: 1093 4435 863 731 4441 726 691 667 4514 759 4473 710 731 4441 726 691 667 4514 759 710 PackageArchitecture: all ProcCmdline: /bin/sh /usr/lib/pm-utils/power.d/pci_devices false ProcEnviron: LC_COLLATE=C PATH=(custom, no user) SourcePackage: pm-utils Title: pci_devices does not terminate at computer shutdown UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pm-utils/+bug/1263704/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
