09-25-2016
I think you have to work "backwards".
Change startup to be more minimal, do not start any your own daemons.
If the problem goes away, keep adding them back into the mix one by one. If it is resource contention, like waiting on some kind of lock, it may be hard to track down. Any daemons that work cooperatively with others may deserve first attention.
If the problem still exists, you may have to start looking at your configuration by changing to single user boot, then changing startup/shutdown script to boot and shutdown at each runlevel to eliminate process groups and processes as a problem.
I vote for your hand-rolled daemons as a great place to start. Sorry I cannot be more specific.
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LEARN ABOUT OPENSOLARIS
shutdown
shutdown(1B) SunOS/BSD Compatibility Package Commands shutdown(1B)
NAME
shutdown - close down the system at a given time
SYNOPSIS
/usr/ucb/shutdown [-fhknr] time [warning-message]...
DESCRIPTION
shutdown provides an automated procedure to notify users when the system is to be shut down. time specifies when shutdown will bring the
system down; it may be the word now (indicating an immediate shutdown), or it may specify a future time in one of two formats: +number and
hour:min. The first form brings the system down in number minutes, and the second brings the system down at the time of day indicated in
24-hour notation.
At intervals that get closer as the apocalypse approaches, warning messages are displayed at terminals of all logged-in users, and of users
who have remote mounts on that machine.
At shutdown time a message is written to the system log daemon, syslogd(1M), containing the time of shutdown, the instigator of the shut-
down, and the reason. Then a terminate signal is sent to init, which brings the system down to single-user mode.
OPTIONS
As an alternative to the above procedure, these options can be specified:
-f Arrange, in the manner of fastboot(1B), that when the system is rebooted, the file systems will not be checked.
-h Execute halt(1M).
-k Simulate shutdown of the system. Do not actually shut down the system.
-n Prevent the normal sync(2) before stopping.
-r Execute reboot(1M).
FILES
/etc/rmtab remote mounted file system table
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWscpu |
+-----------------------------+-----------------------------+
SEE ALSO
fastboot(1B), login(1), halt(1M), reboot(1M), syslogd(1M), sync(2), rmtab(4), attributes(5)
NOTES
Only allows you to bring the system down between now and 23:59 if you use the absolute time for shutdown.
SunOS 5.11 11 Oct 1994 shutdown(1B)