node #f9e0 - ath: phy0: Failed to stop TX DMA, queues=0x004!

[FreifunkUFO]

when this happens, the ping-times to the node was increasing from 100ms to 2500ms.. some 10-20seconds later it goes back to normal (100ms)

May 28 18:35:49 wbm-f9e0 daemon.info dnsmasq[2076]: using nameserver 10.61.238.1#53
May 28 18:35:49 wbm-f9e0 daemon.info dnsmasq[2076]: using local addresses only for domain lan
Jun 2 20:42:52 wbm-f9e0 cron.err crond[1976]: time disparity of 7327 minutes detected
Jun 2 20:46:47 wbm-f9e0 authpriv.info dropbear[2409]: Child connection from 104.61.238.21:49973
Jun 2 20:46:54 wbm-f9e0 authpriv.notice dropbear[2409]: Password auth succeeded for 'root' from 104.61.238.21:49973
root@wbm-f9e0:~# logread -f
Jun 2 20:50:01 wbm-f9e0 cron.info crond[1976]: crond: USER root pid 2565 cmd lua /usr/bin/wbm-fwupdate
Jun 2 20:52:16 wbm-f9e0 kern.err kernel: [ 693.450000] ath: phy0: Failed to stop TX DMA, queues=0x004!
Jun 2 20:52:42 wbm-f9e0 kern.warn kernel: [ 719.640000] net_ratelimit: 100 callbacks suppressed

[FreifunkUFO]

DISTRIB_DESCRIPTION="OpenWrt Barrier Breaker r36577"

[FreifunkUFO]

here we have this, node is still alive this time:

root@wbm-f9e0:# uptime
21:00:56 up 20 min, load average: 0.04, 0.11, 0.12
root@wbm-f9e0:# logread -f
Jun 2 21:01:37 wbm-f9e0 kern.err kernel: [ 1254.570000] ath: phy0: Failed to stop TX DMA, queues=0x004!
Jun 2 21:01:37 wbm-f9e0 kern.err kernel: [ 1254.580000] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
Jun 2 21:01:37 wbm-f9e0 kern.err kernel: [ 1254.590000] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 2 21:01:38 wbm-f9e0 kern.err kernel: [ 1255.510000] ath: phy0: Failed to stop TX DMA, queues=0x004!
Jun 2 21:01:38 wbm-f9e0 kern.err kernel: [ 1255.520000] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
Jun 2 21:01:38 wbm-f9e0 kern.err kernel: [ 1255.530000] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 2 21:01:39 wbm-f9e0 kern.err kernel: [ 1256.420000] ath: phy0: Failed to stop TX DMA, queues=0x004!
Jun 2 21:01:39 wbm-f9e0 kern.err kernel: [ 1256.650000] ath: phy0: Failed to stop TX DMA, queues=0x004!
Jun 2 21:01:39 wbm-f9e0 kern.err kernel: [ 1256.660000] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
Jun 2 21:01:39 wbm-f9e0 kern.err kernel: [ 1256.670000] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 2 21:01:39 wbm-f9e0 kern.err kernel: [ 1257.050000] ath: phy0: Failed to stop TX DMA, queues=0x004!
Jun 2 21:01:39 wbm-f9e0 kern.err kernel: [ 1257.070000] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
Jun 2 21:01:39 wbm-f9e0 kern.err kernel: [ 1257.080000] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 2 21:01:42 wbm-f9e0 kern.err kernel: [ 1259.880000] ath: phy0: Failed to stop TX DMA, queues=0x004!
Jun 2 21:01:42 wbm-f9e0 kern.err kernel: [ 1259.890000] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00026800
Jun 2 21:01:42 wbm-f9e0 kern.err kernel: [ 1259.900000] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 2 21:01:43 wbm-f9e0 kern.err kernel: [ 1260.720000] ath: phy0: Failed to stop TX DMA, queues=0x004!
Jun 2 21:01:43 wbm-f9e0 kern.err kernel: [ 1260.730000] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00024e00
Jun 2 21:01:43 wbm-f9e0 kern.err kernel: [ 1260.740000] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 2 21:02:44 wbm-f9e0 kern.warn kernel: [ 1322.010000] net_ratelimit: 80 callbacks suppressed

[FreifunkUFO]

https://dev.openwrt.org/ticket/9654

[FreifunkUFO]

[shenleilei]

I met the same problem ,have you solved the problem?