In case a systemd service disables itself while init is still in its
boot sequence the reloading of the service files can be problematic.
In that case: It seems that systemd looses the state of .device units,
and some services depend on such units (namely serial consoles such as
serial-getty@ttymxc0.service). As a result no getty is spawned on the
affected serial tty.
After a power-cycle the second boot (which does not disable services)
succeeds.

The following sequence shows this problem:

| Jan 09 16:36:28 apalis-t30 systemctl[162]: Removed 
/etc/systemd/system/sysinit.target.wants/run-postinsts.service.
| Jan 09 16:36:28 apalis-t30 systemd[1]: Reloading.
|    ...
|    And then the failing one:
| Feb 22 15:33:15 apalis-t30 systemd[1]: dev-ttyS0.device: Job 
dev-ttyS0.device/start timed out.
| Feb 22 15:33:15 apalis-t30 systemd[1]: Timed out waiting for device 
dev-ttyS0.device.
| Feb 22 15:33:15 apalis-t30 systemd[1]: Dependency failed for Serial Getty on 
ttyS0.
| Feb 22 15:33:15 apalis-t30 systemd[1]: serial-getty@ttyS0.service: Job 
serial-getty@ttyS0.service/start failed with result 'dependency'.
| Feb 22 15:33:15 apalis-t30 systemd[1]: dev-ttyS0.device: Job 
dev-ttyS0.device/start failed with result 'timeout'.
| Feb 22 15:33:15 apalis-t30 systemd[1]: Reached target Login Prompts.

(the time has been updated between this two events, but that does not
influence the issue)

Using --no-reload in the service file avoids the "Reloading." message
above and seems to not cause such issues anymore.

Reported-by: Stefan Agner <stefan.ag...@toradex.com>
Signed-off-by: Max Krummenacher <max.krummenac...@toradex.com>
(cherry picked from commit 4a425d05bac5dcba023b67aa3d726f7e7869404f)
---
 meta/recipes-devtools/run-postinsts/run-postinsts/run-postinsts.service | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git 
a/meta/recipes-devtools/run-postinsts/run-postinsts/run-postinsts.service 
b/meta/recipes-devtools/run-postinsts/run-postinsts/run-postinsts.service
index 85a0439..1b71a1f 100644
--- a/meta/recipes-devtools/run-postinsts/run-postinsts/run-postinsts.service
+++ b/meta/recipes-devtools/run-postinsts/run-postinsts/run-postinsts.service
@@ -8,7 +8,7 @@ ConditionPathExistsGlob=#SYSCONFDIR#/*-postinsts
 [Service]
 Type=oneshot
 ExecStart=#SBINDIR#/run-postinsts
-ExecStartPost=#BASE_BINDIR#/systemctl disable run-postinsts.service
+ExecStartPost=#BASE_BINDIR#/systemctl --no-reload disable run-postinsts.service
 RemainAfterExit=No
 TimeoutSec=0
 
-- 
2.9.4

-- 
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