Bug#818136: systemd: slashes in partition labels

[Pat Hooper]

Package: systemd
Version: 229-2

Including a slash (/) in a partition label leads to systemd not being able
to check the partition for errors. This in turn lead to problems accessing
the partition (with no obvious acknowledgement of problems to the user). I
and perhaps others dealing with this bug may erroneously suspect hard disk
issues.

I was able to work around this bug by removing the slashes from the labels
of the relevant partition.

I am able to reproduce the bug with the following steps:
1) Create a new partition with label "/test". (I used gnome-disks.)
2) Format the partition with ext4.
3) Add the following line to /etc/fstab:
LABEL="/test" /junk/test ext4 noauto,x-systemd.automount 1 2
4) Run the following commands as root:
mkdir -p /junk/test
cd junk
mount test
touch test/forcefsck
5) Reboot.
6) Then from a terminal:
cd /junk
cd test/
The last command hangs until control-c is pressed when the following error
is produced:
^X^C^Cbash: cd: test/: Interrupted system call

(Doing other commands such as listing directories results in a situation
when even control-c won't return you to the shell.)

"grep test /var/log/daemon.log" returns:
Mar 13 23:12:45 panther systemd[1]: junk-test.automount: Got automount
request for /junk/test, triggered by 2380 (bash)
Mar 13 23:12:45 panther systemd[1]: Starting File System Check on
/dev/disk/by-label/\x2ftest...
Mar 13 23:12:45 panther systemd-fsck[2481]: Failed to stat
/dev/disk/by-label//test: No such file or directory
Mar 13 23:12:45 panther systemd[1]:
systemd-fsck at dev-disk-by\x2dlabel-\x5cx2ftest.service:
Main process exited, code=exited, status=1/FAILURE
Mar 13 23:12:45 panther systemd[1]: Failed to start File System Check on
/dev/disk/by-label/\x2ftest.
Mar 13 23:12:45 panther systemd[1]: Dependency failed for /junk/test.
Mar 13 23:12:45 panther systemd[1]: junk-test.mount: Job
junk-test.mount/start failed with result 'dependency'.
Mar 13 23:12:45 panther systemd[1]:
systemd-fsck at dev-disk-by\x2dlabel-\x5cx2ftest.service:
Unit entered failed state.
Mar 13 23:12:45 panther systemd[1]:
systemd-fsck at dev-disk-by\x2dlabel-\x5cx2ftest.service:
Failed with result 'exit-code'.

I am running Debian testing and have been for quite a while. So, this bug
must be fairly new.

What follows below is some output of reportbug. Please let me know if you
want more information. Thank you for your work!

Best,
Pat

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.3.0-1-amd64 (SMP w/12 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  adduser         3.113+nmu3
ii  libacl1         2.2.52-3
ii  libapparmor1    2.10-3+b1
ii  libaudit1       1:2.4.5-1+b1
ii  libblkid1       2.27.1-4
ii  libc6           2.21-9
ii  libcap2         1:2.24-12
ii  libcap2-bin     1:2.24-12
ii  libcryptsetup4  2:1.7.0-2
ii  libgcrypt20     1.6.5-2
ii  libgpg-error0   1.21-2
ii  libkmod2        22-1
ii  liblzma5        5.1.1alpha+20120614-2.1
ii  libmount1       2.27.1-4
ii  libpam0g        1.1.8-3.2
ii  libseccomp2     2.2.3-3
ii  libselinux1     2.4-3+b1
ii  libsystemd0     229-2
ii  mount           2.27.1-4
ii  util-linux      2.27.1-4

Versions of packages systemd recommends:
ii  dbus            1.10.6-1
ii  libpam-systemd  229-2

Versions of packages systemd suggests:
pn  systemd-container  <none>
pn  systemd-ui         <none>

Versions of packages systemd is related to:
ii  udev  229-2

-- no debconf information
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