Public bug reported:
We have noticed that after the upgrade from 12.04 to 14.04, daemons that
are started from rc.d scripts are sometimes being run twice.
We've tracked this down to a race condition in the failsafe script.
Here is the normal sequence of events:
Mar 16 10:39:37 failsafe: Failsafe of 120 seconds reached.
Mar 16 10:39:37 failsafe: net-device-up start event emitted
Mar 16 10:39:37 failsafe: starting failsafe script
Mar 16 10:39:37 failsafe: sleeping in failsafe script
Mar 16 10:39:37 failsafe: static-network-up start event emitted
Mar 16 10:39:37 failsafe: rc-sysinit starting event emitted
Mar 16 10:39:37 kernel: [ 2.056689] init: failsafe main process (642) killed
by TERM signal
(Note the inaccurate message about the 120 seconds being reached which
is actually logged immediately on boot - best just to ignore that. The
TERM warning is also harmless - that is the normal result.)
Here is what we see on a bad boot, where the rc.d scripts are started
twice:
Mar 16 10:24:47 failsafe: static-network-up start event emitted
Mar 16 10:24:47 failsafe: rc-sysinit starting event emitted
Mar 16 10:24:47 failsafe: Failsafe of 120 seconds reached.
Mar 16 10:24:47 failsafe: net-device-up start event emitted
Mar 16 10:24:47 failsafe: starting failsafe script
Mar 16 10:24:47 failsafe: sleeping in failsafe script
Mar 16 10:26:47 failsafe: emitting from failsafe script
Mar 16 10:26:47 failsafe: rc-sysinit starting event emitted
Mar 16 10:26:47 kernel: [ 122.229597] init: failsafe main process (797) killed
by TERM signal
rc-sysinit has been emitted twice.
Note that the rc-sysinit event has been emitted before the failsafe
script has been emitted, because in this boot it happens that the
static-network-up event was emitted before the net-device-up event.
As a result, the normal stop on "starting rc-sysinit" rule in the
failsafe job definition doesn't work because the failsafe job is not yet
running.
Another way to look at the issue is that the rc-sysinit job definition's
"start on (filesystem and static-network-up) or failsafe-boot" means
that it will always start twice if it finishes before the failsafe
handler fires.
** Affects: upstart (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1557761
Title:
rc-sysinit run twice due to failsafe race condition
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