[FS#1771] Error Log - mac80211/rx.c

[OpenWrt Bugs]

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FS#1771 - Error Log - mac80211/rx.c 
User who did this - Bill Cole (grumpybozo)

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I occasionally get this same hang (same line number cited) on a Buffalo WZR-HP-G300NH (also an ath9k device.)
 
After a burst of these warnings, wireless is flaky (lots of pauses and disconnects) and occasional "ath: phy0: DMA failed to stop in 10 ms" warnings are logged. If I use the /sbin/wifi tool to down+up the wifi, it's good for as short as a few days or as long as a few weeks. Seems like a bug in the ath9k driver or hardware. 


[13936083.034615] ------------[ cut here ]------------
[13936083.039574] WARNING: CPU: 0 PID: 0 at backports-2017-11-01/net/mac80211/rx.c:4347 0x833a50d4 [mac80211 at 83380000+0x60020]
[13936083.050805] Rate marked as an HT rate but passed status->rate_idx is not an MCS index [0-76]: 78 (0x4e)
[13936083.060501] Modules linked in: ath9k ath9k_common pppoe ppp_async ath9k_hw ath pppox ppp_generic nf_conntrack_ipv6 mac80211 iptable_nat ipt_REJECT ipt_MASQUERADE cfg80211 xt_time xt_tcpudp xt_state xt_nat xt_multiport xt_mark xt_mac xt_limit xt_conntrack xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_CT slhc nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat nf_log_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache nf_conntrack iptable_mangle iptable_filter ip_tables crc_ccitt compat ledtrig_usbport ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables x_tables usb_storage xhci_plat_hcd xhci_pci xhci_hcd uhci_hcd ohci_platform ohci_hcd sd_mod scsi_mod ext4 jbd2 mbcache crc16 crc32c_generic crypto_hash ehci_platform
[13936083.132135]  ehci_hcd gpio_button_hotplug usbcore nls_base usb_common
[13936083.137346] CPU: 0 PID: 0 Comm: swapper Tainted: G        W       4.9.184 #0
[13936083.144707] Stack : 804a76e2 00000040 00000000 00000001 00000000 00000000 00000000 00000000
[13936083.153445]         00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[13936083.162183]         00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[13936083.170920]         00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[13936083.179640]         00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[13936083.188377]         ...
[13936083.191116] Call Trace:
[13936083.193703] [] 0x8006ad4c
[13936083.197480] [] 0x8006ad4c
[13936083.201279] [] 0x8007fd84
[13936083.205058] [] 0x833a50d4 [mac80211 at 83380000+0x60020]
[13936083.211317] [] 0x8007fdbc
[13936083.215099] [] 0x8029b390
[13936083.218892] [] 0x833a50d4 [mac80211 at 83380000+0x60020]
[13936083.225121] [] 0x802a172c
[13936083.228905] [] 0x8029dc34
[13936083.232690] [] 0x802a1938
[13936083.236540] [] 0x82c6714c [ath9k at 82c60000+0x16370]
[13936083.242578] [] 0x82c647c4 [ath9k at 82c60000+0x16370]
[13936083.248537] [] 0x80082eb4
[13936083.252328] [] 0x800ab03c
[13936083.256105] [] 0x8008278c
[13936083.259880] [] 0x800aeb6c
[13936083.263672] [] 0x803b0000
[13936083.267450] [] 0x801f8dd8
[13936083.271243] [] 0x80066278
[13936083.275012] 
[13936083.276777] ---[ end trace dadb317981ee14b6 ]---
[14127897.714788] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42100020 DMADBG_7=0x000084c0
[14368967.240646] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42100020 DMADBG_7=0x000286c0
[14686246.344467] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42100020 DMADBG_7=0x000286c0
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1771#comment8772

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