[Bug 198298] [ath] ath_edma_rxbuf_alloc()/ath_edma_rxfifo_alloc() causes system lockup when RX buffers are exausted

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198298

            Bug ID: 198298
           Summary: [ath] ath_edma_rxbuf_alloc()/ath_edma_rxfifo_alloc()
                    causes system lockup when RX buffers are exausted
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: gjb at FreeBSD.org

syslog(8) logs the following just before the system becomes unresponsive:

Mar  4 20:48:15 nucleus kernel: ath0: ath_edma_rxfifo_alloc: Q1: alloc failed:
i=0, nbufs=128?
Mar  4 20:48:15 nucleus kernel: ath0: ath_edma_rxbuf_alloc: nothing on rxbuf?!
Mar  4 20:48:15 nucleus kernel: ath0: ath_edma_rxfifo_alloc: Q1: alloc failed:
i=0, nbufs=128?
Mar  4 20:48:15 nucleus kernel: ath0: ath_edma_rxbuf_alloc: nothing on rxbuf?!

When setting dev.ath.0.txagg to '1', dmesg(8) shows:

Mar  4 20:57:44 nucleus kernel: no tx bufs (empty list): 0
Mar  4 20:57:44 nucleus kernel: no tx bufs (was busy): 0
Mar  4 20:57:44 nucleus kernel: aggr single packet: 0
Mar  4 20:57:44 nucleus kernel: aggr single packet w/ BAW closed: 0
Mar  4 20:57:44 nucleus kernel: aggr non-baw packet: 0
Mar  4 20:57:44 nucleus kernel: aggr aggregate packet: 0
Mar  4 20:57:44 nucleus kernel: aggr single packet low hwq: 0
Mar  4 20:57:44 nucleus kernel: aggr single packet RTS aggr limited: 0
Mar  4 20:57:44 nucleus kernel: aggr sched, no work: 41
Mar  4 20:57:44 nucleus kernel: 0:          0  1:          0  2:          0  3:
         0 
Mar  4 20:57:44 nucleus kernel: 4:          0  5:          0  6:          0  7:
         0 
Mar  4 20:57:44 nucleus kernel: 8:          0  9:          0 10:          0 11:
         0 
Mar  4 20:57:44 nucleus kernel: 12:          0 13:          0 14:          0
15:          0 
Mar  4 20:57:44 nucleus kernel: 16:          0 17:          0 18:          0
19:          0 
Mar  4 20:57:44 nucleus kernel: 20:          0 21:          0 22:          0
23:          0 
Mar  4 20:57:44 nucleus kernel: 24:          0 25:          0 26:          0
27:          0 
Mar  4 20:57:44 nucleus kernel: 28:          0 29:          0 30:          0
31:          0 
Mar  4 20:57:44 nucleus kernel: 32:          0 33:          0 34:          0
35:          0 
Mar  4 20:57:44 nucleus kernel: 36:          0 37:          0 38:          0
39:          0 
Mar  4 20:57:44 nucleus kernel: 40:          0 41:          0 42:          0
43:          0 
Mar  4 20:57:44 nucleus kernel: 44:          0 45:          0 46:          0
47:          0 
Mar  4 20:57:44 nucleus kernel: 48:          0 49:          0 50:          0
51:          0 
Mar  4 20:57:44 nucleus kernel: 52:          0 53:          0 54:          0
55:          0 
Mar  4 20:57:44 nucleus kernel: 56:          0 57:          0 58:          0
59:          0 
Mar  4 20:57:44 nucleus kernel: 60:          0 61:          0 62:          0
63:          0 
Mar  4 20:57:44 nucleus kernel: 
Mar  4 20:57:44 nucleus kernel: HW TXQ 0: axq_depth=0, axq_aggr_depth=0,
axq_fifo_depth=0, holdingbf=0
Mar  4 20:57:44 nucleus kernel: HW TXQ 1: axq_depth=0, axq_aggr_depth=0,
axq_fifo_depth=0, holdingbf=0
Mar  4 20:57:44 nucleus kernel: HW TXQ 2: axq_depth=0, axq_aggr_depth=0,
axq_fifo_depth=0, holdingbf=0
Mar  4 20:57:44 nucleus kernel: HW TXQ 3: axq_depth=0, axq_aggr_depth=0,
axq_fifo_depth=0, holdingbf=0
Mar  4 20:57:44 nucleus kernel: HW TXQ 8: axq_depth=0, axq_aggr_depth=0,
axq_fifo_depth=0, holdingbf=0
Mar  4 20:57:44 nucleus kernel: Total TX buffers: 512; Total TX buffers busy: 0
(512)
Mar  4 20:57:44 nucleus kernel: Total mgmt TX buffers: 32; Total mgmt TX
buffers busy: 0
Mar  4 20:57:44 nucleus kernel: 0: fifolen: 16/16; head=0; tail=0; m_pending=0,
m_holdbf=0
Mar  4 20:57:44 nucleus kernel: 1: fifolen: 128/128; head=50; tail=50;
m_pending=0, m_holdbf=0
Mar  4 20:57:44 nucleus kernel: Total RX buffers in free list: 368 buffers

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