Busy Error (0x0a) from BlueZ related to BTP Error from auto-pts

[jebanon]

Running a GAP test suite against BlueZ, I'm seeing several BTP_ERROR failures. When these occur, BlueZ emits the following error: advertising.c:add_client_complete() Failed to add advertisement: Busy (0x0a)

So far, I've seen them on:

• GAP/DISC/NONM/BV-01-C
• GAP/DISC/GENM/BV-01-C
• GAP/DISC/GENM/BV-02-C
• GAP/IDLE/NAMP/BV-01-C
• GAP/CONN/NCON/BV-01-C

These same tests fail about 90% of the time, but every once in a while they will pass. Thus, I'm not sure if this is a fault with btpclient, or BlueZ or something else.

Does this likely mean that BlueZ is busy servicing something else and is thus unable to respond to the query? Anywhere you suggest I dig to better understand the cause, or helpful logs that I can share?