I don't understand why distributions think it is okay to keep removable
devices mounted across suspend. This is just asking for data corruption.
I've written some sleep scripts that prevent suspend of unmount could not
be done but these are fairly hacked up...
On Mar 11, 2013 6:45 AM, "Nathan Korth" <email address hidden> wrote:

> This is still a problem; I've been having issues using an SD card with a
> netbook that has very little internal memory. After resume, the mount is
> still there but it doesn't work. In fact, one time it seems to have
> caused a kernel panic:
>
> Mar  9 22:16:09 nkorth-mini kernel: [12594.477903] EXT4-fs (mmcblk0p1):
> mount failed
> Mar  9 22:16:09 nkorth-mini kernel: [12594.484058] BUG: unable to handle
> kernel NULL pointer dereference at 00000054
> Mar  9 22:16:09 nkorth-mini kernel: [12594.484328] IP: [<c1148663>]
> mount_fs+0x43/0x180
> Mar  9 22:16:09 nkorth-mini kernel: [12594.484504] *pdpt =
> 00000000152bf001 *pde = 0000000000000000
> Mar  9 22:16:09 nkorth-mini kernel: [12594.484709] Oops: 0000 [#1] SMP
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/883748
>
> Title:
>   Suspend/resume corrupts external data storage devices
>
> Status in “linux” package in Ubuntu:
>   Confirmed
>
> Bug description:
>   Ubuntu will permit suspend/resume (have not tried hibernate) without
>   attempting to unmount any external USB storage devices, even though
>   processes may still have open files on these devices. After the system
>   is resumed, the USB storage devices may not be present, due to not
>   having been re-enumerated yet. This can and DOES result in data
>   corruption on the filesystem on the external device, as evidenced by
>   errors in dmesg and having to do journal replays. I am not sure that
>   the dmesg here will have the whole story (due to dmesg -c having been
>   run as part of another bug report) but the parts that may not be there
>   basically boil down to reiserfs being very unhappy that the block
>   device was yanked out from under it.
>
>   As a policy decision, it is WRONG to allow suspend to take place
>   unless externally-attached USB block devices are still mounted. The
>   system needs to attempt to unmount everything in /media prior to
>   suspending, and needs to FAIL TO SUSPEND (throwing an error) if all
>   devices cannot be unmounted due to some of the mount points being in
>   use.
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 11.10
>   Package: linux-image-3.0.0-12-generic 3.0.0-12.20
>   ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
>   Uname: Linux 3.0.0-12-generic x86_64
>   NonfreeKernelModules: nvidia
>   AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
>   ApportVersion: 1.23-0ubuntu3
>   Architecture: amd64
>   ArecordDevices:
>    **** List of CAPTURE Hardware Devices ****
>    card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
>      Subdevices: 2/2
>      Subdevice #0: subdevice #0
>      Subdevice #1: subdevice #1
>   AudioDevicesInUse:
>    USER        PID ACCESS COMMAND
>    /dev/snd/controlC0:  steve     24738 F.... pulseaudio
>   CRDA: Error: [Errno 2] No such file or directory
>   Card0.Amixer.info:
>    Card hw:0 'Intel'/'HDA Intel at 0xfe220000 irq 49'
>      Mixer name : 'Analog Devices AD1984'
>      Components : 'HDA:11d41984,17aa20bb,00100400'
>      Controls      : 32
>      Simple ctrls  : 20
>   Card29.Amixer.info:
>    Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30,
> fw 7KHT24WW-1.08'
>      Mixer name : 'ThinkPad EC 7KHT24WW-1.08'
>      Components : ''
>      Controls      : 1
>      Simple ctrls  : 1
>   Card29.Amixer.values:
>    Simple mixer control 'Console',0
>      Capabilities: pswitch pswitch-joined penum
>      Playback channels: Mono
>      Mono: Playback [on]
>   Date: Sat Oct 29 23:43:31 2011
>   GvfsMonitorLog: Monitoring events. Press Ctrl+C to quit.
>   HibernationDevice: RESUME=UUID=31923f5c-ed0d-4c47-92e3-5ee28dfeafe4
>   HotplugNewDevices:
>
>   HotplugNewMounts:
>
>   InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64
> (20101007)
>   MachineType: LENOVO 646067U
>   PccardctlIdent:
>    Socket 0:
>      no product info available
>   PccardctlStatus:
>    Socket 0:
>      no card
>   ProcEnviron:
>    PATH=(custom, user)
>    LANG=en_US.UTF-8
>    SHELL=/bin/bash
>   ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.0.0-12-generic
> root=UUID=d4fbb1dd-1060-4e10-b8b8-f7d06ae50146 ro quiet splash vt.handoff=7
>   RelatedPackageVersions:
>    linux-restricted-modules-3.0.0-12-generic N/A
>    linux-backports-modules-3.0.0-12-generic  N/A
>    linux-firmware                            1.60
>   SourcePackage: linux
>   Symptom: storage
>   UdevMonitorLog:
>    monitor will print the received events for:
>    UDEV - the event which udev sends out after rule processing
>   UdisksMonitorLog: Monitoring activity from the disks daemon. Press
> Ctrl+C to cancel.
>   UpgradeStatus: Upgraded to oneiric on 2011-10-17 (13 days ago)
>   dmi.bios.date: 03/18/2011
>   dmi.bios.vendor: LENOVO
>   dmi.bios.version: 7LETC9WW (2.29 )
>   dmi.board.name: 646067U
>   dmi.board.vendor: LENOVO
>   dmi.board.version: Not Available
>   dmi.chassis.asset.tag: No Asset Information
>   dmi.chassis.type: 10
>   dmi.chassis.vendor: LENOVO
>   dmi.chassis.version: Not Available
>   dmi.modalias:
> dmi:bvnLENOVO:bvr7LETC9WW(2.29):bd03/18/2011:svnLENOVO:pn646067U:pvrThinkPadT61p:rvnLENOVO:rn646067U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
>   dmi.product.name: 646067U
>   dmi.product.version: ThinkPad T61p
>   dmi.sys.vendor: LENOVO
>
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>