I have done some more experimentation and it shows fairly
strange results.
I edited the file /etc/console-setup/cached_setup_font.sh
to look like this:
#!/bin/sh
# added
SEMAPHORE="/cached_setup_font.sh.running"
LOG="/console-cached_setup_font.sh-tracing.log"
TS=`date --rfc-3339=ns`
if test ! -f ${SEMAPHORE} ; then
> ${SEMAPHORE} ;
echo "$$ / $TS" > ${SEMAPHORE} ;
echo "$$ - $TS: ${SEMAPHORE} created" >> $LOG ;
else
VAL=`cat ${SEMAPHORE}` ;
echo "$$ - $TS: ${SEMAPHORE} exists and contains [$VAL], exiting"
>> $LOG ;
exit 0 ;
fi
# ---
setfont '/etc/console-setup/Lat15-Terminus16.psf.gz'
if ls /dev/fb* >/dev/null 2>/dev/null; then
for i in /dev/vcs[0-9]*; do
{ :
setfont '/etc/console-setup/Lat15-Terminus16.psf.gz'
} < /dev/tty${i#/dev/vcs} > /dev/tty${i#/dev/vcs}
done
fi
mkdir -p /run/console-setup
> /run/console-setup/font-loaded
for i in /dev/vcs[0-9]*; do
{ :
printf '\033%%G'
} < /dev/tty${i#/dev/vcs} > /dev/tty${i#/dev/vcs}
done
# added
rm -f ${SEMAPHORE} >> $LOG
TS=`date --rfc-3339=ns`
echo "$$ - $TS: ${SEMAPHORE} deleted" >> $LOG
# ---
the idea being to prevent it from running in parallel.
Observations after many reboots with neither semaphore nor
log existing:
Sometimes cached_setup_font.sh does not seem to get run AT
ALL -- the log file simply does not exist after a clean boot.
When the log file DOES exist it does indeed show
cached_setup_font.sh to run in parallel "early" in the boot
process and once more "later":
421 - 2017-03-24 11:31:44.262310078+01:00:
/cached_setup_font.sh.running created
423 - 2017-03-24 11:31:44.262785627+01:00:
/cached_setup_font.sh.running created
421 - 2017-03-24 11:31:45.721488930+01:00:
/cached_setup_font.sh.running deleted
423 - 2017-03-24 11:31:45.721489699+01:00:
/cached_setup_font.sh.running deleted
659 - 2017-03-24 11:31:47.733106958+01:00:
/cached_setup_font.sh.running created
659 - 2017-03-24 11:31:47.755347426+01:00:
/cached_setup_font.sh.running deleted
Note how the two early runs even manage to race each other
within a few (4) microseconds:
421 - 2017-03-24 11:31:44.262*3*10078+01:00:
/cached_setup_font.sh.running created
423 - 2017-03-24 11:31:44.262*7*85627+01:00:
/cached_setup_font.sh.running created
which means that this code:
#!/bin/sh
# added
SEMAPHORE="/cached_setup_font.sh.running"
LOG="/console-cached_setup_font.sh-tracing.log"
TS=`date --rfc-3339=ns`
if test ! -f ${SEMAPHORE} ; then
> ${SEMAPHORE} ;
echo "$$ / $TS" > ${SEMAPHORE} ;
runs in less than 4 µs because it manages to race inbetween
if test ! -f ${SEMAPHORE} ; then
> ${SEMAPHORE} ;
(that's why I first create the semaphore before taking the
time to pipe data into it).
Here's what journalctl -b records for that time span:
Mär 24 11:31:43 hermes systemd[1]: Starting Load/Save RF Kill Switch
Status...
Mär 24 11:31:44 hermes systemd[1]: Started Load/Save Screen Backlight
Brightness of backlight:intel_backlight.
Mär 24 11:31:44 hermes systemd[1]: Started Load/Save Screen Backlight
Brightness of backlight:acpi_video0.
Mär 24 11:31:44 hermes kernel: psmouse serio4: elantech: assuming
hardware version 2 (with firmware version 0x040101)
Mär 24 11:31:44 hermes kernel: ath: phy0: Enable LNA combining
Mär 24 11:31:44 hermes kernel: ath: phy0: ASPM enabled: 0x42
Mär 24 11:31:44 hermes kernel: ath: EEPROM regdomain: 0x60
Mär 24 11:31:44 hermes kernel: ath: EEPROM indicates we should expect a
direct regpair map
Mär 24 11:31:44 hermes kernel: ath: Country alpha2 being used: 00
Mär 24 11:31:44 hermes kernel: ath: Regpair used: 0x60
Mär 24 11:31:44 hermes kernel: psmouse serio4: elantech: Synaptics
capabilities query result 0x7e, 0x13, 0x0d.
Mär 24 11:31:44 hermes kernel: psmouse serio4: elantech: Elan sample
query result 19, 00, 00
Mär 24 11:31:44 hermes kernel: input: ETPS/2 Elantech Touchpad as
/devices/platform/i8042/serio4/input/input15
Mär 24 11:31:44 hermes kernel: ieee80211 phy0: Selected rate control
algorithm 'minstrel_ht'
Mär 24 11:31:44 hermes kernel: ieee80211 phy0: Atheros AR9285 Rev:2
mem=0xf89b0000, irq=17
Mär 24 11:31:44 hermes kernel: iTCO_vendor_support: vendor-support=0
Mär 24 11:31:44 hermes kernel: iTCO_wdt: Intel TCO WatchDog Timer
Driver v1.11
Mär 24 11:31:44 hermes kernel: iTCO_wdt: Found a ICH9M TCO device
(Version=2, TCOBASE=0x0860)
Mär 24 11:31:44 hermes kernel: iTCO_wdt: initialized. heartbeat=30 sec
(nowayout=0)
Mär 24 11:31:45 hermes mtp-probe[477]: checking bus 7, device 2:
"/sys/devices/pci0000:00/0000:00:1a.7/usb7/7-3"
Mär 24 11:31:45 hermes mtp-probe[477]: bus: 7, device: 2 was not an MTP
device
Mär 24 11:31:45 hermes systemd[1]: Reached target Sound Card.
Mär 24 11:31:45 hermes mtp-probe[541]: checking bus 4, device 3:
"/sys/devices/pci0000:00/0000:00:1d.0/usb4/4-2"
Mär 24 11:31:45 hermes mtp-probe[541]: bus: 4, device: 3 was not an MTP
device
Mär 24 11:31:46 hermes systemd[1]: Started Load/Save RF Kill Switch
Status.
Mär 24 11:31:46 hermes systemd[1]: Found device ST9320325AS 5.
Mär 24 11:31:46 hermes systemd[1]: Activating swap
/dev/disk/by-uuid/d6e3928c-5468-449e-a777-af84dbc668ff...
Mär 24 11:31:47 hermes kernel: Adding 6014972k swap on /dev/sda5.
Priority:1 extents:1 across:6014972k FS
Mär 24 11:31:47 hermes systemd[1]: Activated swap
/dev/disk/by-uuid/d6e3928c-5468-449e-a777-af84dbc668ff.
Mär 24 11:31:47 hermes systemd[1]: Reached target Swap.
Mär 24 11:31:47 hermes systemd[1]: Reached target System Initialization.
Mär 24 11:31:47 hermes systemd[1]: Listening on CUPS Scheduler.
Mär 24 11:31:47 hermes systemd[1]: Listening on Avahi mDNS/DNS-SD Stack
Activation Socket.
Mär 24 11:31:47 hermes systemd[1]: Listening on D-Bus System Message
Bus Socket.
Mär 24 11:31:47 hermes systemd-udevd[290]: Process '/sbin/crda' failed
with exit code 249.
Mär 24 11:31:47 hermes systemd[1]: apt-daily.timer: Adding 8h 27min
31.003476s random time.
Mär 24 11:31:47 hermes systemd[1]: Started Daily apt activities.
Mär 24 11:31:47 hermes systemd[1]: Listening on GPS (Global Positioning
System) Daemon Sockets.
Mär 24 11:31:47 hermes systemd[1]: Listening on PC/SC Smart Card Daemon
Activation Socket.
Mär 24 11:31:47 hermes systemd[1]: Listening on ACPID Listen Socket.
Mär 24 11:31:47 hermes systemd[1]: Listening on ACPI fakekey daemon
FIFO.
Mär 24 11:31:47 hermes systemd[1]: Reached target Sockets.
Mär 24 11:31:47 hermes systemd[1]: Started Daily Cleanup of Temporary
Directories.
Mär 24 11:31:47 hermes systemd[1]: Reached target Timers.
Mär 24 11:31:47 hermes systemd[1]: Started ACPI Events Check.
Mär 24 11:31:47 hermes systemd[1]: Reached target Paths.
Mär 24 11:31:47 hermes systemd[1]: Reached target Basic System.
Mär 24 11:31:47 hermes systemd[1]: Started Regular background program
processing daemon.
Mär 24 11:31:47 hermes systemd[1]: Starting Avahi mDNS/DNS-SD Stack...
Mär 24 11:31:47 hermes systemd[1]: Starting Save/Restore Sound Card
State...
Mär 24 11:31:47 hermes systemd[1]: Started Run anacron jobs.
Mär 24 11:31:47 hermes systemd[1]: Starting Restore /etc/resolv.conf if
the system crashed before the ppp link was shut down...
Mär 24 11:31:47 hermes cron[694]: (CRON) INFO (pidfile fd = 3)
Mär 24 11:31:48 hermes anacron[701]: Anacron 2.3 started on 2017-03-24
Here are console related messages:
Mär 24 11:31:35 hermes kernel: console [tty0] enabled
Mär 24 11:31:35 hermes kernel: NMI watchdog: enabled on all CPUs,
permanently consumes one hw-PMU counter.
Mär 24 11:31:35 hermes kernel: mtrr: your CPUs had inconsistent
variable MTRR settings
Mär 24 11:31:36 hermes systemd[1]: Started Set the console keyboard
layout.
Mär 24 11:31:36 hermes systemd[1]: Starting Set console font and
keymap...
Mär 24 11:31:37 hermes systemd[1]: Started Set console font and keymap.
Mär 24 11:31:41 hermes kernel: [drm] Replacing VGA console driver
Mär 24 11:32:21 hermes rc.local[1010]: adjusting default console log
level
Mär 24 11:34:26 hermes /usr/sbin/gpm[806]: Request on 6 (console 2)
Mär 24 11:44:29 hermes /usr/sbin/gpm[806]: Request on 7 (console 6)
...
Mär 24 11:31:43 hermes kernel: fbcon: inteldrmfb (fb0) is primary device
...
Mär 24 11:31:43 hermes kernel: Console: switching to colour frame
buffer device 170x48
Mär 24 11:31:43 hermes kernel: i915 0000:00:02.0: fb0: inteldrmfb frame
buffer device
Anything else I can try ?
HTH,
Karsten
--
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E167 67FD A291 2BEA 73BD 4537 78B9 A9F9 E407 1346
