Bug#804511: systemd: won't let me mount /media/dvd after plugging in a USB optical drive

[Michael Gold]

Package: systemd
Version: 227-2

I have an optical drive in my PC, with an fstab entry:
  /dev/dvd /media/dvd udf,iso9660 user,noauto 0 0
Today I plugged in another optical drive via USB; and since unplugging
it, systemd won't let me use /media/dvd for a loopback mount.

For example, I run "mount -o loop test.iso /media/dvd; ls -l /media/dvd"
and can see the contents.  But systemd immediately unmounts it:
  Nov 08 20:48:51 terra kernel: UDF-fs: warning (device loop0): udf_load_vrs: No anchor found
  Nov 08 20:48:51 terra kernel: UDF-fs: Rescanning with blocksize 2048
  Nov 08 20:48:51 terra kernel: UDF-fs: warning (device loop0): udf_load_vrs: No anchor found
  Nov 08 20:48:51 terra kernel: UDF-fs: Rescanning with blocksize 2048
  Nov 08 20:48:51 terra kernel: UDF-fs: INFO Mounting volume 'CDROM', timestamp 2015/11/08 23:14 (1000)
  Nov 08 20:48:51 terra systemd[1]: media-dvd.mount: Unit is bound to inactive unit dev-sr1.device. Stopping, too.
  Nov 08 20:48:51 terra systemd[1]: Unmounting /media/dvd...
  Nov 08 20:48:51 terra systemd[1]: Unmounted /media/dvd.
  Nov 08 20:48:51 terra systemd[1]: media-dvd.mount: Unit entered failed state.

I've included the "media-dvd.mount" section from systemd-analyze below.
I don't know how that job got associated with sr1 or how to disassociate
it (/dev/dvd points to sr0).  Given that "noauto" is set, I don't expect
systemd to react at all.

A workaround is to use another mountpoint.

-- Michael


-> Unit media-dvd.mount:
	Description: /media/dvd
	Instance: n/a
	Unit Load State: loaded
	Unit Active State: failed
	Inactive Exit Timestamp: Sun 2015-11-08 20:48:51 EST
	Active Enter Timestamp: Sun 2015-11-08 20:48:51 EST
	Active Exit Timestamp: Sun 2015-11-08 20:48:51 EST
	Inactive Enter Timestamp: Sun 2015-11-08 20:48:51 EST
	GC Check Good: yes
	Need Daemon Reload: no
	Transient: no
	Slice: system.slice
	CGroup: n/a
	CGroup realized: no
	CGroup mask: 0x0
	CGroup members mask: 0x0
	Name: media-dvd.mount
	Documentation: man:fstab(5)
	Documentation: man:systemd-fstab-generator(8)
	Fragment Path: /run/systemd/generator/media-dvd.mount
	Source Path: /etc/fstab
	Requires: -.mount
	Wants: system.slice
	BindsTo: dev-sr1.device
	WantedBy: dev-sr1.device
	Conflicts: umount.target
	Before: local-fs.target
	Before: umount.target
	After: systemd-journald.socket
	After: local-fs-pre.target
	After: system.slice
	After: dev-sr1.device
	After: -.mount
	References: -.mount
	References: systemd-journald.socket
	References: local-fs-pre.target
	References: umount.target
	References: dev-sr1.device
	References: system.slice
	References: local-fs.target
	RequiresMountsFor: /media /dev/dvd
	StopWhenUnneeded: no
	RefuseManualStart: no
	RefuseManualStop: no
	DefaultDependencies: yes
	OnFailureJobMode: replace
	IgnoreOnIsolate: yes
	IgnoreOnSnapshot: no
	Mount State: failed
	Result: exit-code
	Where: /media/dvd
	What: /dev/dvd
	File System Type: udf,iso9660
	Options: user,noauto
	From /proc/self/mountinfo: no
	From fragment: yes
	DirectoryMode: 0755
	UMask: 0022
	WorkingDirectory: /
	RootDirectory: /
	NonBlocking: no
	PrivateTmp: no
	PrivateNetwork: no
	PrivateDevices: no
	ProtectHome: no
	ProtectSystem: no
	IgnoreSIGPIPE: yes
	LimitNOFILE: 4096
	StandardInput: null
	StandardOutput: journal
	StandardError: inherit
	SyslogFacility: daemon
	SyslogLevel: info
	KillMode: control-group
	KillSignal: SIGTERM
	SendSIGKILL: yes
	SendSIGHUP:  no

-- Package-specific info:

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: arm64, mips

Kernel: Linux 4.2.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages systemd depends on:
ii  adduser         3.113+nmu3
ii  libacl1         2.2.52-2
ii  libapparmor1    2.10-2+b1
ii  libaudit1       1:2.4.4-4
ii  libblkid1       2.27.1-1
ii  libc6           2.19-22
ii  libcap2         1:2.24-12
ii  libcap2-bin     1:2.24-12
ii  libcryptsetup4  2:1.6.6-5
ii  libgcrypt20     1.6.4-3
ii  libkmod2        21-1
ii  liblzma5        5.1.1alpha+20120614-2.1
ii  libmount1       2.27.1-1
ii  libpam0g        1.1.8-3.1
ii  libseccomp2     2.2.3-2
ii  libselinux1     2.3-2+b1
ii  libsystemd0     227-2
ii  mount           2.27.1-1
ii  sysv-rc         2.88dsf-59.2
ii  udev            227-2
ii  util-linux      2.27.1-1

Versions of packages systemd recommends:
ii  dbus            1.10.2-1
ii  libpam-systemd  227-2

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

-- no debconf information
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