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If the async callbacks didn't get a chance to finish properly, we'd leak memory. The output from test-bus-util with additional log line in the callbacks to show what is happening: $ build/test-bus-util /* test_name_async (0) */ Bus test-bus: changing state UNSET → OPENING Bus test-bus: changing state OPENING → AUTHENTICATING Bus test-bus: changing state AUTHENTICATING → HELLO Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=Hello cookie=1 reply_cookie=0 signature=n/a error-name=n/a error-message=n/a Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=RequestName cookie=2 reply_cookie=0 signature=su error-name=n/a error-message=n/a Got message type=method_return sender=org.freedesktop.DBus destination=:1.732 path=n/a interface=n/a member=n/a cookie=4294967295 reply_cookie=1 signature=s error-name=n/a error-message=n/a Bus test-bus: changing state HELLO → RUNNING Bus test-bus: changing state RUNNING → CLOSED request_name_destroy_callback n_ref=1 /* test_name_async (20) */ Bus test-bus: changing state UNSET → OPENING Bus test-bus: changing state OPENING → AUTHENTICATING Bus test-bus: changing state AUTHENTICATING → HELLO stage 0: sd_bus_process returned 1 Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=Hello cookie=1 reply_cookie=0 signature=n/a error-name=n/a error-message=n/a Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=RequestName cookie=2 reply_cookie=0 signature=su error-name=n/a error-message=n/a stage 1: sd_bus_process returned 1 Got message type=method_return sender=org.freedesktop.DBus destination=:1.733 path=n/a interface=n/a member=n/a cookie=4294967295 reply_cookie=1 signature=s error-name=n/a error-message=n/a Bus test-bus: changing state HELLO → RUNNING stage 2: sd_bus_process returned 1 Got message type=signal sender=org.freedesktop.DBus.Local destination=n/a path=/org/freedesktop/DBus/Local interface=org.freedesktop.DBus.Local member=Connected cookie=4294967295 reply_cookie=0 signature=n/a error-name=n/a error-message=n/a stage 3: sd_bus_process returned 1 Got message type=signal sender=org.freedesktop.DBus destination=:1.733 path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=NameAcquired cookie=4294967295 reply_cookie=0 signature=s error-name=n/a error-message=n/a stage 4: sd_bus_process returned 1 Got message type=error sender=org.freedesktop.DBus destination=:1.733 path=n/a interface=n/a member=n/a cookie=4294967295 reply_cookie=2 signature=s error-name=org.freedesktop.DBus.Error.AccessDenied error-message=Request to own name refused by policy Unable to request name, will retry after reloading DBus configuration: Request to own name refused by policy Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=ReloadConfig cookie=3 reply_cookie=0 signature=n/a error-name=n/a error-message=n/a request_name_destroy_callback n_ref=2 stage 5: sd_bus_process returned 1 Got message type=method_return sender=org.freedesktop.DBus destination=:1.733 path=n/a interface=n/a member=n/a cookie=4294967295 reply_cookie=3 signature= error-name=n/a error-message=n/a Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=RequestName cookie=4 reply_cookie=0 signature=su error-name=n/a error-message=n/a request_name_destroy_callback n_ref=1 stage 6: sd_bus_process returned 1 Got message type=error sender=org.freedesktop.DBus destination=:1.733 path=n/a interface=n/a member=n/a cookie=4294967295 reply_cookie=4 signature=s error-name=org.freedesktop.DBus.Error.AccessDenied error-message=Request to own name refused by policy Unable to request name, failing connection: Request to own name refused by policy Bus test-bus: changing state RUNNING → CLOSING stage 7: sd_bus_process returned 1 Bus test-bus: changing state CLOSING → CLOSED stage 8: sd_bus_process returned 1 stage 9: sd_bus_process returned -104 Processing failed: Connection reset by peer