machined: add a bit more debug logging

src/machine/machine.c

@@ -33,6 +33,7 @@
 #include "path-util.h"
 #include "process-util.h"
 #include "serialize.h"
+#include "signal-util.h"
 #include "socket-util.h"
 #include "special.h"
 #include "stdio-util.h"
@@ -680,6 +681,8 @@ int machine_stop(Machine *m) {
 
         assert(m);
 
+        log_debug("Stopping machine '%s'.", m->name);
+
         if (!IN_SET(m->class, MACHINE_CONTAINER, MACHINE_VM))
                 return -EOPNOTSUPP;
 
@@ -813,6 +816,8 @@ MachineState machine_get_state(Machine *s) {
 int machine_kill(Machine *m, KillWhom whom, int signo) {
         assert(m);
 
+        log_debug("Killing machine '%s' (%s) with signal %s.", m->name, kill_whom_to_string(whom), signal_to_string(signo));
+
         if (!IN_SET(m->class, MACHINE_VM, MACHINE_CONTAINER))
                 return -EOPNOTSUPP;
 

src/machine/machined-core.c

@@ -162,13 +162,16 @@ void manager_gc(Manager *m, bool drop_not_started) {
 
                 /* First, if we are not closing yet, initiate stopping */
                 if (machine_may_gc(machine, drop_not_started) &&
-                    machine_get_state(machine) != MACHINE_CLOSING)
+                    machine_get_state(machine) != MACHINE_CLOSING) {
+                        log_debug("Stopping machine '%s' due to GC.", machine->name);
                         machine_stop(machine);
+                }
 
                 /* Now, the stop probably made this referenced
                  * again, but if it didn't, then it's time to let it
                  * go entirely. */
                 if (machine_may_gc(machine, drop_not_started)) {
+                        log_debug("Finalizing machine '%s' due to GC.", machine->name);
                         machine_finalize(machine);
                         machine_free(machine);
                 }