From: Yuchung Cheng <ych...@google.com>
Date: Wed,  5 Dec 2018 14:38:38 -0800

> TCP loss probe timer may fire when the retranmission queue is empty but
> has a non-zero tp->packets_out counter. tcp_send_loss_probe will call
> tcp_rearm_rto which triggers NULL pointer reference by fetching the
> retranmission queue head in its sub-routines.
> 
> Add a more detailed warning to help catch the root cause of the inflight
> accounting inconsistency.
> 
> Reported-by: Rafael Tinoco <rafael.tin...@linaro.org>
> Signed-off-by: Yuchung Cheng <ych...@google.com>
> Signed-off-by: Eric Dumazet <eduma...@google.com>
> Signed-off-by: Neal Cardwell <ncardw...@google.com>

Applied, thanks for working to diagnose this so quickly.

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