[Bug 1263704] Re: pci_devices does not terminate at computer shutdown

[ahau]

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

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https://bugs.launchpad.net/bugs/1263704

Title:
  pci_devices does not terminate at computer shutdown

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