LinuxGnomeWaylandBackend::probe() called zbus::blocking::Connection::session()
directly. The blocking facade internally constructs a current-thread tokio
runtime and block_on()s its async D-Bus client. probe() runs from
PttController::new (sync) which is called from start_audio (async on the
bridge tokio runtime). Nested runtimes panic with 'Cannot start a runtime
from within a runtime'.
Symptom on Linux: the first voice-channel join surfaced a SnackBar
'Could not join channel: join: task N panicked ...' while the channel-move
command had already succeeded server-side. User saw 'channel joined but voice
not enabled'.
Fix: run the cheap blocking probe on a dedicated std::thread (no ambient
runtime), join it synchronously, propagate the version / error. Probe is
microseconds; the join cost is negligible.
EdisonJwa
73066749e3