client was blocked by poll

When the server process blocked at some point, the connection establishment was blocked in qb_ipc_us_ready because the poll timeout equals -1. It might need a positive number?

Start by tracing connection establishment through qb_ipc_us_ready and inspect how its poll timeout is set when the server process blocks. Reproduce the blocking case and determine whether the timeout can remain indefinite; done means connection establishment no longer hangs in that scenario and the relevant behavior is verified.

Written by the indexing model from the issue text.