Public bug reported:
Is there anything changed in xubuntu 16.04 LTS that causes tcplay device
mapper to hang ?
The following command sequence works fine in xubuntu 14.04 but in 16.04
it hangs at the device mapper stage (5 below) when the valid passphrase
is entered. The passphrase I use here is ‘testpw’.
I know it has accepted the correct passphrase because it gives a message
if I enter an invalid passphrase.
This is a fresh install using the xubuntu-16.04.1-desktop-i386.iso on
the same 32-bit processor laptop as the 14.04 system (multi-boot).
I prefer using tcplay because of the container portability.
There are no dmesg messages during the process on 16.04.
This is the command sequence:
1) fallocate -l 20M foo.tc
2) sudo losetup -f
(response is /dev/loop0)
3) sudo losetup /dev/loop0 foo.tc
4) sudo tcplay -c -d /dev/loop0 -a whirlpool -b AES-256-XTS
Summary of actions:
- Completely erase *EVERYTHING* on /dev/loop0
- Create volume on /dev/loop0
Are you sure you want to proceed? (y/n) y
Securely erasing the volume...
This process may take some time depending on the size of the volume
Creating volume headers...
Depending on your system, this process may take a few minutes as it uses true
random data which might take a while to refill
and after about 10 minutes
Writing volume headers to disk...
5) sudo tcplay -m foo.tc -d /dev/loop0
and it then hangs – I have given it up to one hour.
On xubuntu 14.04 step (5) takes less than one second, and I can then do the
6) sudo mkfs.ext4 /dev/mapper/foo.tc
7) sudo mount /dev/mapper/foo.tc /mnt/FOO_DRIVE/
8) df -h
which shows the normal stuff plus
/dev/mapper/foo.tc 19M 170K 17M 1% /mnt/FOO_DRIVE
On xubuntu 16.04, after killing step 5, the would be step 6 gets the message
‘The file /dev/mapper/foo.tc does not exist and no size was specified.’
The above was the bug experience on a 32-bit laptop.
On a test 64-bit base unit, I was able to show that the bug also applies
to 16.04 LTS 64-bit versions of xubuntu and ubuntu
** Affects: ubuntu
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tcplay hangs at the device mapper stage. This happens in 16.04 LTS
version of xubuntu (32 bit and 64 bit) and ubuntu (64bit). This makes
tcplay containers not accessible.
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