[pkg-cryptsetup-devel] Bug#644082: Bug#644082: Encrypted filesystem sometimes fails to unmount in gnome desktop

[Jonas Meurer]

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Hey Bernhard,

Am 02.10.2011 17:36, schrieb Bernhard:
> I have encrypted my USB Stick with CryptSetup and LUKS. It works
> perfectly.
> 
> If i try to mount the USB Stick, the gnome desktop environment asks
> for the Passphrase. This works, i have access to the filesystem.
> 
> At next, i have unmounted the USB Stick. During unmounting,
> sometimes a window is shown with the following message (german): 
> "Auswerfen von 509 MB Filesystem nicht möglich. Medium konnte nicht
> ausgeworfen werden. Ein oder mehr Speicherorte auf dem Medium sind
> noch aktiv". Translated into english: "Unmounting of 509 MB
> Filesystem not possible. Medium can't be unmounted. One or more
> storage places of the medium are active". This is, even though no
> file was opened on the filesystem. I have only mounted and
> unmounted the encrypted filesystem.
> 
> I have investigated the problem with the tool lsof. Result were two
> additional tasks which possibly holds the filesystem: - scsi_eh_5 -
> usb-storage
> 
> If you need additional informations, please let me know. This
> behaviour is reproducable on my computer.

I'm pretty sure that this is not a bug in cryptsetup, but in some
other package. Do you still discover this issue with recent Debian?

Do the processes which access the filesystem (scsi_eh_5 and
usb-storage) disappear after some time?

A common reason for the issue you described are indexing processes
(like nepomuk, strigi, ...) which read the content of a USB disk in
the background. You should check which processes read/write to the
device by executing 'lsof <device>' (e.g.
'/dev/mapper/udisks-luks-uuid-1234-5678-90ab-cdef12345678-uid1000')
and 'fuser -m <mount_point>', (e.g.
'/media/fedcba09-8765-4321-fedc-ba09-87654321fedc').

Greetings,
 jonas
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=ll1Z
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