Public bug reported:
snapd can't be purged when there are snaps installed, it fails with with
error:
rm: cannot remove '/snap': Device or resource busy
Steps to reproduce on Hirsute (but also affects Focal, Groovy):
lxc launch ubuntu-daily:hirsute purgefail ; \
sleep 5 ; \
lxc exec purgefail -- apt-get -y remove --purge snapd
This doesn't immediate affect Bionic as it has no snaps installed by
default, but it does fail if a snap is manually installed. To reproduce
on Bionic just run:
snap install hello-world ; apt-get -y remove --purge snapd
The snapd package should perhaps remove all the snaps on purge? This
problem affects tools like autopkgtest-build-lxd and autopkgtest-
buildvm-ubuntu-cloud that setup an Ubuntu minimal image to be used to
run autopkgtests (via /usr/share/autopkgtest/setup-commands/setup-
testbed), but fail to remove snapd. In general a package that fails to
remove from its default state has in my opinion a high severity bug.
Full Hirsute reproducer output:
$ lxc launch ubuntu-daily:hirsute purgefail ; sleep 5 ; lxc exec purgefail --
apt-get -y remove --purge snapd
Creating purgefail
Starting purgefail
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
libfreetype6 squashfs-tools
Use 'apt autoremove' to remove them.
The following packages will be REMOVED:
snapd*
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 117 MB disk space will be freed.
(Reading database ... 31976 files and directories currently installed.)
Removing snapd (2.47.1+20.10.1) ...
Stopping snap.lxd.activate.service
Stopping unit snap.lxd.activate.service
Waiting until unit snap.lxd.activate.service is stopped [attempt 1]
snap.lxd.activate.service is stopped.
Stopping snap.lxd.daemon.service
Stopping unit snap.lxd.daemon.service
Waiting until unit snap.lxd.daemon.service is stopped [attempt 1]
snap.lxd.daemon.service is stopped.
Stopping snap.lxd.daemon.unix.socket
Stopping unit snap.lxd.daemon.unix.socket
Waiting until unit snap.lxd.daemon.unix.socket is stopped [attempt 1]
snap.lxd.daemon.unix.socket is stopped.
dpkg: warning: while removing snapd, unable to remove directory '/snap': Device
or resource busy - directory may be a mount point?
Processing triggers for man-db (2.9.3-2) ...
Processing triggers for dbus (1.12.20-1ubuntu1) ...
Processing triggers for mime-support (3.64ubuntu1) ...
(Reading database ... 31894 files and directories currently installed.)
Purging configuration files for snapd (2.47.1+20.10.1) ...
Stopping snap.lxd.activate.service
Stopping unit snap.lxd.activate.service
Waiting until unit snap.lxd.activate.service is stopped [attempt 1]
snap.lxd.activate.service is stopped.
Removing snap.lxd.activate.service
Stopping snap.lxd.daemon.service
Stopping unit snap.lxd.daemon.service
Waiting until unit snap.lxd.daemon.service is stopped [attempt 1]
snap.lxd.daemon.service is stopped.
Removing snap.lxd.daemon.service
Stopping snap-core18-1932.mount
Stopping unit snap-core18-1932.mount
Waiting until unit snap-core18-1932.mount is stopped [attempt 1]
snap-core18-1932.mount is stopped.
Removing snap core18 and revision 1932
Removing snap-core18-1932.mount
Stopping snap-lxd-18137.mount
Stopping unit snap-lxd-18137.mount
Waiting until unit snap-lxd-18137.mount is stopped [attempt 1]
snap-lxd-18137.mount is stopped.
Removing snap lxd and revision 18137
Stopping unit snap.lxd.daemon.unix.socket
Waiting until unit snap.lxd.daemon.unix.socket is stopped [attempt 1]
snap.lxd.daemon.unix.socket is stopped.
Removing snap-lxd-18137.mount
Stopping snap-snapd-9721.mount
Stopping unit snap-snapd-9721.mount
Waiting until unit snap-snapd-9721.mount is stopped [attempt 1]
snap-snapd-9721.mount is stopped.
Removing snap snapd and revision 9721
Removing snap-snapd-9721.mount
Final directory cleanup
rm: cannot remove '/snap': Device or resource busy
dpkg: error processing package snapd (--purge):
installed snapd package post-removal script subprocess returned error exit
status 1
dmesg: read kernel buffer failed: Operation not permitted
Errors were
encountered while processing:
snapd
E: Sub-process /usr/bin/dpkg returned an error code (1)
** Affects: snapd (Ubuntu)
Importance: High
Status: New
** Changed in: snapd (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1903967
Title:
Can't purge snapd: rm: cannot remove '/snap': Device or resource busy
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