On 24/03/2015 8:57 AM, Patrick Ohly wrote:
Hello!
I'm using systemd from OE-core master to boot core-image-minimal. I'm
seeing a boot failure where "Run pending postinsts" (aka
run-postinsts.service) gets stuck during booting under very specific
circumstances:
1. The package has a pkg_postinst_${PN} which (intentionally)
failed during image building, thus delaying its execution to the
first boot.
2. The package uses "inherit systemd" to enable its own systemd
service.
It seems to be "systemctl start <service name>" which is hanging,
because I can reproduce the same behavior without systemd.bbclass in the
following pkg_postinst:
pkg_postinst_${PN} () {
#!/bin/sh -e
# Cannot run during image building...
if [ x"$D" != "x" ]; then
exit 1
fi
# Do something on target during first boot.
systemctl enable foobar
systemctl start foobar # <====
}
It works without the last line. The actual recipe is a bit more complex,
but I can try to create a dummy one if that would help.
Any idea what could be causing this and, more importantly, how to fix
it?
I am not sure how well systemd works with executing systemctl to
manipulate services from within a service that is starting...
What is the definition of foobar.service?
foobar.service may depend on other services/mounts/targets to start
before it but since "systemctl start" is blocking, those dependencies
may not be satisfied yet until sometime after run-postinsts.service
which can result in a circular dependency deadlock. See
DefaultDependencies, After, Before in
http://www.freedesktop.org/software/systemd/man/systemd.unit.html.
Things to try:
1. Refactor foobar.service and your image recipe to not require calling
systemctl from within a systemd service
2. Change "systemctl start foobar" to "systemctl start --no-block
foobar" to let the startup continue without waiting until foobar is started
Regards,
Jonathan
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