Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: systemd (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1589394
Title:
"debug" kernel parameter causes "No buffer space available" Denial of
Service
Status in systemd package in Ubuntu:
Confirmed
Bug description:
15.10/16.04 amd64
With the Linux kernel's "debug" parameter set systemd spams the logs
to such a degree that boot fails with the plymouth progress indicator
constantly cycling, only tty1 available, and no clear indication from
the last messages displayed on console as to why.
Leaving aside the unresolved bug of systemd adopting the Linux 'debug'
parameter, and thus being the direct cause of this, the complete
failure to boot as a result is a serious regression and a Denial of
Service. Needing to alter the Linux command-line to use "loglevel=7"
is a distasteful workaround.
A boot without "debug" using the same GRUB menuitem starts fine which
suggests the systemd debug-level logging is the direct cause.
Orignally it was not even clear if the system has transitioned from
initrd to rootfs at this point as there's no way to interact.
Later systemic tests showed the transition had occurred and
/var/log/syslog contained some clues:
$ grep 'No buffer space' /tmp/syslog-debug.log | wc -l
103
E.g.:
Jun 6 07:36:38 hephaestion whoopsie[1500]: [07:36:38]
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name
org.freedesktop.Netwo
rkManager was not provided by any .service files
Jun 6 07:36:38 hephaestion systemd[1]: thermald.service: Failed to send unit
change signal for thermald.service: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: grub-common.service: Failed to send
unit change signal for grub-common.service: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: whoopsie.service: Failed to send unit
change signal for whoopsie.service: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: rsyslog.service: Failed to send unit
change signal for rsyslog.service: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: ofono.service: Failed to send unit
change signal for ofono.service: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: dbus.socket: Failed to send unit
change signal for dbus.socket: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: dbus.service: Failed to send unit
change signal for dbus.service: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: systemd-logind.service: Failed to
send unit change signal for systemd-logind.service: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: smartd.service: Failed to send unit
change signal for smartd.service: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: ModemManager.service: Failed to send
unit change signal for ModemManager.service: No buffer space available
Jun 6 07:36:38 hephaestion NetworkManager[1559]: <info> NetworkManager
(version 1.0.4) is starting...
Jun 6 07:36:38 hephaestion systemd[1]: accounts-daemon.service: Failed to
send unit change signal for accounts-daemon.service: No buffer space available
Jun 6 07:36:38 hephaestion NetworkManager[1559]: <info> Read config:
/etc/NetworkManager/NetworkManager.conf
Jun 6 07:36:38 hephaestion systemd[1]: gpu-manager.service: Failed to send
unit change signal for gpu-manager.service: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: binfmt-support.service: Failed to
send unit change signal for binfmt-support.service: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: cups.socket: Failed to send unit
change signal for cups.socket: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: cups.service: Failed to send unit
change signal for cups.service: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: basic.target: Failed to send unit
change signal for basic.target: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: sockets.target: Failed to send unit
change signal for sockets.target: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
144: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
169: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
139: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
196: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
152: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
172: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
170: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
164: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
190: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
174: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
165: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
146: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
126: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
201: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
204: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: Failed to send job change signal for
166: No buffer space available
Jun 6 07:36:38 hephaestion systemd[1]: var-lib-lxcfs.mount: Changed dead ->
mounted
Jun 6 07:36:38 hephaestion systemd[1]: run-cgmanager-fs.mount: Changed dead
-> mounted
Jun 6 07:36:38 hephaestion systemd[1]: run-cgmanager-fs.mount: Failed to
send unit change signal for run-cgmanager-fs.mount: No buffer space available
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