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The receive path hands incoming packets to the stack and transmits whatever reply comes back, without checking that a TX descriptor is free, though the poll path checks exactly that. Under sustained bidirectional load the reply lands on a descriptor the DMA still owns: with assertions built in, a panic from the RX work queue (DEBUGASSERT(des3 & RD_OWN), reproduced under a VNC pointer flood); without them, corruption of a frame in flight. A reply to received data is almost always an acknowledgement, and a peer that misses one retransmits; overwriting a frame the DMA owns recovers from nothing. Drop the reply when the ring is full, using the same descriptor test the poll path already trusts. Assisted-by: Claude:opus-5 Signed-off-by: Jorge Guzman <jorge.gzm@gmail.com> |
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