tor: stop racing the watchdog for the managed-Tor pid

BtfStopManagedTor read, waited on and signalled g_managedTorPid without
holding cs_managedTor, while the watchdog concurrently reaps the same child
and resets it. If the watchdog won, the stop path spun ten seconds on ECHILD
and then sent SIGKILL to a stale, potentially recycled pid. Snapshot the pid
under the lock, treat ECHILD as already-exited, and only clear the global if
it still holds our pid.

0 files changed, 0 insertions, 0 deletions