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Previously when the __del__ method ran on LVMShellProxy we would blindly
call terminate(). This was a race condition as the underlying process
may/maynot be present. When the process is still present the SIGTERM will
end up being seen by lvmdbusd too. Re-work the code so that we
first try to wait for the child process to exit and only then if it hasn't
exited will we send it a SIGTERM. We also ensure that when this is
executed we will briefly ignore a SIGTERM that arrives for the daemon.
Historically we have seen a few different errors which occur when we call
fullreport. Failing exit code and JSON which is missing one or more keys.
Instruct lvm to dump the debug to a file during fullreport calls when we
fork & exec lvm. If we encounter an error, ouput the debug data.
The reason this isn't being done when lvmshell is used is because we
don't have an easy way to test the error paths.
This change is complicated by the following:
1. We don't know if fullreport was good until we evaluate all the JSON.
This is done a bit after we have called into lvm and returned.
2. We don't want to orphan the debug file used by lvm if the daemon is
killed. Thus we try to minimize the window where the debug file hasn't
already been unlinked. A RFE to pass an open FD to lvm for this
purpose is outstanding.
The temp. file is:
-rw------. 1 root root /tmp/lvmdbusd.lvm.debug.XXXXXXXX.log
Introduce an exception which is used for known existing issues with lvm.
This is used to distinguish between errors between lvm itself and lvmdbusd.
In the case of lvm bugs, when we simply retry the operation we will log
very little. Otherwise, we will dump a full traceback for investigation
when we do the retry.
Lvm occasionally fails to return all the request JSON keys in the output of
"fullreport". This happens very rarely. When it does the daemon was reporting
the resulting informational exception:
MThreadRunner: exception
Traceback (most recent call last):
File "/usr/lib/python3.9/site-packages/lvmdbusd/utils.py", line 667, in _run
self.rc = self.f(*self.args)
File "/usr/lib/python3.9/site-packages/lvmdbusd/fetch.py", line 40, in _main_thread_load
(lv_changes, remove) = load_lvs(
File "/usr/lib/python3.9/site-packages/lvmdbusd/lv.py", line 143, in load_lvs
return common(
File "/usr/lib/python3.9/site-packages/lvmdbusd/loader.py", line 37, in common
objects = retrieve(search_keys, cache_refresh=False)
File "/usr/lib/python3.9/site-packages/lvmdbusd/lv.py", line 95, in lvs_state_retrieve
l['vdo_operating_mode'],
KeyError: 'vdo_operating_mode'
The daemon retries the operation, which usually works and the daemon continues.
However, simply reporting this informational stack trace is causing CI and other
automated tests to fail as they expect no tracebacks in the log output.
Remove the reporting of this code path unless it persists and causes the daemon
to give up and exit.
Ref: https://bugzilla.redhat.com/show_bug.cgi?id=2120267
When the daemon isn't started with --debug we will keep a circular
buffer of the past N number of debug messages which we will output
when we encounter an issue.
When exec'ing lvm, it's possible to get large amounts of both stdout
and stderr depending on the state of lvm and the size of the lvm
configuration. If we allow any of the buffers to fill we can end
up deadlocking the process. Ensure we are handling stdout & stderr
during lvm execution.
Ref. https://bugzilla.redhat.com/show_bug.cgi?id=1966636
Signed-off-by: Tony Asleson <tasleson@redhat.com>
VDO pool LVs are represented by a new dbus interface VgVdo. Currently
the interface only has additional VDO properties, but when the
ability to support additional LV creation is added we can add a method
to the interface.
If you send a SIGUSR1 (10) to the daemon it will dump all the
threads current stacks to stdout. This will be useful when the
daemon is apparently hung and not processing requests.
eg.
$ sudo kill -10 <daemon pid>
Make sure that any and all code that executes in the main thread is
wrapped with a try/except block to ensure that at the very least
we log when things are going wrong.
When executing in the main thread, if we encounter an exception we
will bypass the notify_all call on the condition and the calling thread
never wakes up.
@staticmethod
def runner(obj):
# noinspection PyProtectedMember
Exception thrown here
----> obj._run()
So the following code doesn't run, which causes calling thread to hang
with obj.cond:
obj.function_complete = True
obj.cond.notify_all()
Additionally for some unknown reason the stderr is lost.
Best guess is it's something to do with scheduling a python function
into the GLib.idle_add. That made finding issue quite difficult.
If we always disable the sending of notify dbus events then in the case
where all the users are lvm dbus users we will be in udev handling mode
until at least 1 external lvm command occurs. Instead we will not disable
notify dbus until after we get at least 1 external event. This makes the
service get into the correct mode of operation faster.
Utilizing the --config option we will utilize global/notify_dbus=0 so
that the service itself doesn't generate change events which it then needs to
process.
Added a properties changed signal on the job dbus object so that client
can wait for a signal that the job is complete instead of polling or
blocking on the wait method.
Gris debugged that when we don't have a method the introspection
data is missing the interface itself eg.
<interface name="<your_obj_iface_name>" />
When adding the properties to the dbus object introspection we will
add the interface too if it's missing. This now allows us the
ability to have a dbus object with only properties.
The normal mode of operation will be to monitor for udev events until an
ExternalEvent occurs. In that case the service will disable monitoring
for udev events and use ExternalEvent exclusively.
Note: User specifies --udev the service will always monitor udev regardless
if ExternalEvent is being called too.
When we are running in a terminal it's useful to have a date & ts on log
output like you get when output goes to the journal. Check if we are
running on a tty and if we are, add it in.
