I have found a significant difference between the syslogs of an "N 2" boot and
an "unknown" boot.
See syslog_N2 and syslog_unknown, attached. I find using diffuse to look at
them side-by-side very useful.
I've changed times and process numbers to nn:nn:nn and nnn to make taking diffs
easier.
Start at line 702 in syslog_N2 (S2 below) and syslog_unknown (SU below).
In the SU we see
"... init: rpc_pipefs post-stop process (821)"
In the S2 log, we don't see an "init:" entry until line 741, and it is
"... init: rsyslog state changed from post-start to running"
In fact we don't see an "init:" line for rsyslog state change in SU!
And rsyslog is the last state changes we see in /var/log/boot.log.
Is that the race condition?
To find out, I added ... and started rsyslog ... to the "start on"
stanza. The syslog said:
:
:
May 26 09:37:42 autoaud-broad1 kernel: [ 0.901105] ACPI: Power Button [PWRF]
May 26 09:37:42 autoaud-broad1 init: Failed to spawn rc-sysinit main process:
unable to open console: Input/output error
May 26 09:37:42 autoaud-broad1 init: rc-sysinit goal changed from start to stop
May 26 09:37:42 autoaud-broad1 init: rc-sysinit state changed from spawned to
stopping
May 26 09:37:42 autoaud-broad1 init: Handling stopping event
May 26 09:37:42 autoaud-broad1 init: rc-sysinit state changed from stopping to
killed
May 26 09:37:42 autoaud-broad1 init: rc-sysinit state changed from killed to
post-stop
May 26 09:37:42 autoaud-broad1 init: rc-sysinit state changed from post-stop to
waiting
May 26 09:37:42 autoaud-broad1 init: Handling stopped event
May 26 09:37:42 autoaud-broad1 init: Handling net-device-up/failed event
May 26 09:37:42 autoaud-broad1 init: Handling started/failed event
:
:
((more experimentation attempting to detect the presence of
/dev/console))
I commented out the "console output" stanza in /etc/init/rc-
sysinit.conf and I seem to have a reliable boot.
I suspect the race condition was with whatever makes /dev/console
writable.
Suggestion: failure of the console stanza should cause an error
message, not stop the *.conf file.
--
Some services not started on boot, runlevel returns "unknown"
https://bugs.launchpad.net/bugs/543506
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