Scenario
1. OSCrypt is uninitialised (i.e. it will have to read its key from the keyring). It will be initialised lazily.
2. A client from thread T calls OSCrypt. OSCrypt acquires its thread-safety lock and schedules GetKeyDelegate() onto the main thread (because gnome-keyring requires to be called from the main thread)
3. A client from the main thread calls OSCrypt and waits on its thread-safety lock.
4. Deadlock: GetKeyDelegate is still scheduled on the main thread and is never executed.

Affected users: systems which still haven't upgraded from gnome-keyring to libsecret.
Frequency: unknown.