https://bugzilla.kernel.org/show_bug.cgi?id=198669
--- Comment #2 from roger@beardandsandals.co.uk (roger@beardandsandals.co.uk) --- Looking at the debug files.
radeon_ring_backup resolves to 0x33430 so +0xd4 is 0x33503.
The line info gives this
radeon_ring.c 323 0x334f4 radeon_ring.c 324 0x33508