HEAD r296148 panic: vtnet_txq_mq_start -> drbr_enqueue -> already enqueue

[Bryan Drewery]

Hit this in bhyve:

> panic: buf=0xfffff8002df9fd00 already enqueue at 652 prod=653 cons=652
> cpuid = 0
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00b5d46150
> vpanic() at vpanic+0x182/frame 0xfffffe00b5d461d0
> panic() at panic+0x43/frame 0xfffffe00b5d46230
> drbr_enqueue() at drbr_enqueue+0x54/frame 0xfffffe00b5d46250
> vtnet_txq_mq_start() at vtnet_txq_mq_start+0x95/frame 0xfffffe00b5d46290
> ether_output() at ether_output+0x56f/frame 0xfffffe00b5d46320
> ip_output() at ip_output+0x1437/frame 0xfffffe00b5d46460
> tcp_output() at tcp_output+0x1b0a/frame 0xfffffe00b5d46630
> tcp_do_segment() at tcp_do_segment+0x27a3/frame 0xfffffe00b5d46730
> tcp_input() at tcp_input+0xdb8/frame 0xfffffe00b5d46880
> ip_input() at ip_input+0x17d/frame 0xfffffe00b5d468e0
> netisr_dispatch_src() at netisr_dispatch_src+0x81/frame 0xfffffe00b5d46940
> ether_demux() at ether_demux+0x15e/frame 0xfffffe00b5d46970
> ether_nh_input() at ether_nh_input+0x344/frame 0xfffffe00b5d469b0
> netisr_dispatch_src() at netisr_dispatch_src+0x81/frame 0xfffffe00b5d46a10
> ether_input() at ether_input+0x4f/frame 0xfffffe00b5d46a40
> vtnet_rxq_eof() at vtnet_rxq_eof+0x823/frame 0xfffffe00b5d46af0
> vtnet_rx_vq_intr() at vtnet_rx_vq_intr+0x4e/frame 0xfffffe00b5d46b20
> intr_event_execute_handlers() at intr_event_execute_handlers+0x96/frame 0xfffffe00b5d46b60
> ithread_loop() at ithread_loop+0xa6/frame 0xfffffe00b5d46bb0
> fork_exit() at fork_exit+0x84/frame 0xfffffe00b5d46bf0
> fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00b5d46bf0
> --- trap 0, rip = 0, rsp = 0, rbp = 0 ---
> KDB: enter: panic
> [ thread pid 12 tid 100025 ]
> Stopped at      kdb_enter+0x3b: movq    $0,kdb_why


-- 
Regards,
Bryan Drewery

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