=== RUN DF-1881 2026-07-20T18:44:52Z ===
DF-1881: dma_fence_get_rcu (dma-fence.h:97-103)

initial state: refcount=0 freed=0 (release has fired)
BUGGY dma_fence_get_rcu returns 0x7fffffdfd6d0 (NULL=0) — got ref on freed fence, retry check if(!got) is DEAD CODE (won't retry)
         later dma_fence_put drives refs 1->0, re-firing release -> DOUBLE FREE (freed=1)
FIXED dma_fence_get_rcu returns NULL=1 — reader retries (correct)
[exit=0]