Every now and then, I have to restart the router because the WiFi just stops working. Sometimes, the WLAN goes down after a day. At better times, it could last a week. At worst, it can be just a few hours. The whole WLAN interface appears to be down; no SSID is being broadcasted. I logged into the router using ssh. What I found is that the dmesg shows a backtrace of what appears to be related to the WiFi driver. But it really isn't helpful since there are no symbols in the backtrace.
Here is one an example of a last few lines of a freshly-dumped dmesg:
[399846.626215] umac task_dump_registers-baseaddr=0x820fd000 backtrace=0x820fcc00 gpr=0x820fce00 cpu=0x820fcf00
[399846.636176]
[399846.636176] $ 0: ffffffff ffffffff ffffffff ffffffff
[399846.636176] $ 4: ffffffff ffffffff ffffffff ffffffff
[399846.636176] $ 8: ffffffff ffffffff ffffffff ffffffff
[399846.636176] $12: ffffffff ffffffff ffffffff ffffffff
[399846.636176] $16: ffffffff ffffffff ffffffff ffffffff
[399846.636176] $20: ffffffff ffffffff ffffffff ffffffff
[399846.636176] $24: ffffffff ffffffff
[399846.636176] $28: ffffffff ffffffff ffffffff ffffffff
[399846.636338] epc: ffffffff
[399846.680180] ra: ffffffff
[399846.682800] Status: ffffffff
[399846.685764] Cause: ffffffff
[399846.688640] BadVA: ffffffff
[399846.691565] Prid: ffffffff
[399846.694360] Call Trace:
[399846.696889] [<0xffffffff>] <-
[399846.699993] [<0xffffffff>] <-
[399846.703051] [<0xffffffff>] <-
[399846.706100] [<0xffffffff>] <-
[399846.709213] [<0xffffffff>] <-
[399846.712270] [<0xffffffff>] <-
[399846.715320] [<0xffffffff>] <-
[399846.718370] [<0xffffffff>] <-
[399846.721481] [<0xffffffff>] <-
[399846.724539] [<0xffffffff>] <-
[399846.727590] [<0xffffffff>] <-
[399846.730760] [<0xffffffff>] <-
[399846.733829] [<0xffffffff>] <-
[399846.736879] [<0xffffffff>] <-
[399846.739993] [<0xffffffff>] <-
[399846.743050] [<0xffffffff>] <-
[399846.746100] [<0xffffffff>] <-
[399846.749252] [<0xffffffff>] <-
[399846.752313] [<0xffffffff>] <-
[399846.755362] [<0xffffffff>] <-
[399846.758411] [<0xffffffff>] <-
[399846.761529] [<0xffffffff>] <-
[399846.764586] [<0xffffffff>] <-
[399846.767636] [<0xffffffff>] <-
[399846.770747] [<0xffffffff>] <-
[399846.773805] [<0xffffffff>] <-
[399846.776855] [<0xffffffff>] <-
[399846.779993] [<0xffffffff>] <-
[399846.783056] [<0xffffffff>] <-
[399846.786106] [<0xffffffff>] <-
[399846.789284] [<0xffffffff>] <-
[399846.792356] [<0xffffffff>] <-
[399846.795406] [<0xffffffff>] <-
[399846.798456] [<0xffffffff>] <-
[399846.801580] [<0xffffffff>] <-
[399846.804638] [<0xffffffff>] <-
[399846.807688] [<0xffffffff>] <-
[399846.810799] [<0xffffffff>] <-
[399846.813857] [<0xffffffff>] <-
[399846.816907] [<0xffffffff>] <-
[399846.820009] [<0xffffffff>] <-
[399846.823066] [<0xffffffff>] <-
[399846.826115] [<0xffffffff>] <-
[399846.829288] [<0xffffffff>] <-
[399846.832359] [<0xffffffff>] <-
[399846.835409] [<0xffffffff>] <-
[399846.838458] [<0xffffffff>] <-
[399846.841612] [<0xffffffff>] <-
[399846.844671] [<0xffffffff>] <-
[399846.847721] [<0xffffffff>] <-
[399846.850836] [<0xffffffff>] <-
[399846.853894] [<0xffffffff>] <-
[399846.856944] [<0xffffffff>] <-
[399846.860060] [<0xffffffff>] <-
[399846.863119] [<0xffffffff>] <-
[399846.866169] [<0xffffffff>] <-
[399846.869282] [<0xffffffff>] <-
[399846.872340] [<0xffffffff>] <-
[399846.875390] [<0xffffffff>] <-
[399846.878440] [<0xffffffff>] <-
[399846.881600] [<0xffffffff>] <-
[399846.884660] [<0xffffffff>] <-
[399846.887710] [<0xffffffff>] <-
[399846.890827] [<0xffffffff>] <-
[399846.893886] [<0xffffffff>] <-
[399846.896936] [<0xffffffff>] <-
[399846.900042] [<0xffffffff>] <-
[399846.903099] [<0xffffffff>] <-
[399846.906150] [<0xffffffff>] <-
[399846.909260] [<0xffffffff>] <-
[399846.912319] [<0xffffffff>] <-
[399846.915369] [<0xffffffff>] <-
[399846.918419] [<0xffffffff>] <-
[399846.921529] [<0xffffffff>] <-
[399846.924587] [<0xffffffff>] <-
[399846.927636] [<0xffffffff>] <-
[399846.930748] [<0xffffffff>] <-
[399846.933809] [<0xffffffff>] <-
[399846.936861] [<0xffffffff>] <-
[399846.940014] [<0xffffffff>] <-
[399846.943083] [<0xffffffff>] <-
[399846.946133] [<0xffffffff>] <-
[399846.949266] [<0xffffffff>] <-
[399846.952324] [<0xffffffff>] <-
[399846.955374] [<0xffffffff>] <-
[399846.958424] [<0xffffffff>] <-
[399846.961536] [<0xffffffff>] <-
[399846.964594] [<0xffffffff>] <-
[399846.967644] [<0xffffffff>] <-
[399846.970756] [<0xffffffff>] <-
[399846.973813] [<0xffffffff>] <-
[399846.976863] [<0xffffffff>] <-
[399846.979966] [<0xffffffff>] <-
[399846.983023] [<0xffffffff>] <-
[399846.986073] [<0xffffffff>] <-
[399846.989184] [<0xffffffff>] <-
[399846.992242] [<0xffffffff>] <-
[399846.995292] [<0xffffffff>] <-
[399846.998342] [<0xffffffff>] <-
[399847.001451] [<0xffffffff>] <-
[399847.004510] [<0xffffffff>] <-
[399847.007559] [<0xffffffff>] <-
[399847.010706] [<0xffffffff>] <-
[399847.013766] [<0xffffffff>] <-
[399847.016816] [<0xffffffff>] <-
[399847.019921] [<0xffffffff>] <-
[399847.022978] [<0xffffffff>] <-
[399847.026154] [<0xffffffff>] <-
[399847.029362] [<0xffffffff>] <-
[399847.032431] [<0xffffffff>] <-
[399847.035483] [<0xffffffff>] <-
[399847.038534] [<0xffffffff>] <-
[399847.041711] [<0xffffffff>] <-
[399847.044779] [<0xffffffff>] <-
[399847.047829] [<0xffffffff>] <-
[399847.050948] [<0xffffffff>] <-
[399847.054006] [<0xffffffff>] <-
[399847.057055] [<0xffffffff>] <-
[399847.060160] [<0xffffffff>] <-
[399847.063218] [<0xffffffff>] <-
[399847.066268] [<0xffffffff>] <-
[399847.069381] [<0xffffffff>] <-
[399847.072439] [<0xffffffff>] <-
[399847.075489] [<0xffffffff>] <-
[399847.078539] [<0xffffffff>] <-
[399847.081651] [<0xffffffff>] <-
[399847.084708] [<0xffffffff>] <-
[399847.087759] [<0xffffffff>] <-
[399847.090871] [<0xffffffff>] <-
[399847.093928] [<0xffffffff>] <-
[399847.096980] [<0xffffffff>] <-
[399847.100130] [<0xffffffff>] <-
[399847.103197] [<0xffffffff>] <-
[399847.106247] [<0xffffffff>] <-
[399847.109377] [<0xffffffff>] <-
[399847.112437] [<0xffffffff>] <-
[399847.115487] [<0xffffffff>] <-
[399847.118537] [<0xffffffff>] <-
[399847.121649] [<0xffffffff>] <-
[399847.124707] [<0xffffffff>] <-
[399847.127757] [<0xffffffff>] <-
[399847.130867] [<0xffffffff>] <-
[399847.133924] [<0xffffffff>] <-
[399847.136978] [<0xffffffff>] <-
[399847.140167] [<0xffffffff>] <-
[399847.143237] [<0xffffffff>] <-
[399847.146287] [<0xffffffff>] <-
[399847.149420] [<0xffffffff>] <-
[399847.152478] [<0xffffffff>] <-
[399847.155528] [<0xffffffff>] <-
[399847.158577] [<0xffffffff>] <-
[399847.161711] [<0xffffffff>] <-
[399847.164773] [<0xffffffff>] <-
[399847.167823] [<0xffffffff>] <-
[399847.170938] [<0xffffffff>] <-
[399847.173995] [<0xffffffff>] <-
[399847.177045] [<0xffffffff>] <-
[399847.180146] [<0xffffffff>] <-
[399847.183202] [<0xffffffff>] <-
[399847.186252] [<0xffffffff>] <-
[399847.189362] [<0xffffffff>] <-
[399847.192419] [<0xffffffff>] <-
[399847.195470] [<0xffffffff>] <-
[399847.198519] [<0xffffffff>] <-
[399847.201629] [<0xffffffff>] <-
[399847.204687] [<0xffffffff>] <-
[399847.207737] [<0xffffffff>] <-
[399847.210845] [<0xffffffff>] <-
[399847.213903] [<0xffffffff>] <-
[399847.216953] [<0xffffffff>] <-
[399847.220054] [<0xffffffff>] <-
[399847.223111] [<0xffffffff>] <-
[399847.226161] [<0xffffffff>] <-
[399847.229272] [<0xffffffff>] <-
[399847.232329] [<0xffffffff>] <-
[399847.235379] [<0xffffffff>] <-
[399847.238429] [<0xffffffff>] <-
[399847.241595] [<0xffffffff>] <-
[399847.244668] [<0xffffffff>] <-
[399847.247718] [<0xffffffff>] <-
[399847.250842] [<0xffffffff>] <-
[399847.253901] [<0xffffffff>] <-
[399847.256951] [<0xffffffff>] <-
[399847.260153] [<0xffffffff>] <-
[399847.263225] [<0xffffffff>] <-
[399847.266275] [<0xffffffff>] <-
[399847.269434] [<0xffffffff>] <-
[399847.272494] [<0xffffffff>] <-
[399847.275544] [<0xffffffff>] <-
[399847.278593] [<0xffffffff>] <-
[399847.281713] [<0xffffffff>] <-
[399847.284771] [<0xffffffff>] <-
[399847.287821] [<0xffffffff>] <-
[399847.290943] [<0xffffffff>] <-
[399847.294002] [<0xffffffff>] <-
[399847.297052] [<0xffffffff>] <-
[399847.300154] [<0xffffffff>] <-
[399847.303217] [<0xffffffff>] <-
[399847.306269] [<0xffffffff>] <-
[399847.309433] [<0xffffffff>] <-
[399847.312501] [<0xffffffff>] <-
[399847.315551] [<0xffffffff>] <-
[399847.318601] [<0xffffffff>] <-
[399847.321722] [<0xffffffff>] <-
[399847.324780] [<0xffffffff>] <-
[399847.327830] [<0xffffffff>] <-
[399847.330950] [<0xffffffff>] <-
[399847.334011] [<0xffffffff>] <-
[399847.337061] [<0xffffffff>] <-
[399847.340166] [<0xffffffff>] <-
[399847.343229] [<0xffffffff>] <-
[399847.346281] [<0xffffffff>] <-
[399847.349441] [<0xffffffff>] <-
[399847.352510] [<0xffffffff>] <-
[399847.355559] [<0xffffffff>] <-
[399847.358609] [<0xffffffff>] <-
[399847.361730] [<0xffffffff>] <-
[399847.364788] [<0xffffffff>] <-
[399847.367838] [<0xffffffff>] <-
[399847.370960] [<0xffffffff>] <-
[399847.374021] [<0xffffffff>] <-
[399847.377070] [<0xffffffff>] <-
[399847.380175] [<0xffffffff>] <-
[399847.383234] [<0xffffffff>] <-
[399847.386284] [<0xffffffff>] <-
[399847.389400] [<0xffffffff>] <-
[399847.392461] [<0xffffffff>] <-
[399847.395511] [<0xffffffff>] <-
[399847.398561] [<0xffffffff>] <-
[399847.401682] [<0xffffffff>] <-
[399847.404741] [<0xffffffff>] <-
[399847.407791] [<0xffffffff>] <-
[399847.410908] [<0xffffffff>] <-
[399847.413967] [<0xffffffff>] <-
[399847.417017] [<0xffffffff>] <-
[399847.420151] [<0xffffffff>] <-
[399847.423219] [<0xffffffff>] <-
[399847.426268] [<0xffffffff>] <-
[399847.429393] [<0xffffffff>] <-
[399847.432453] [<0xffffffff>] <-
[399847.435503] [<0xffffffff>] <-
[399847.438552] [<0xffffffff>] <-
[399847.441668] [<0xffffffff>] <-
[399847.444731] [<0xffffffff>] <-
[399847.447783] [<0xffffffff>] <-
[399847.450948] [<0xffffffff>] <-
[399847.454017] [<0xffffffff>] <-
[399847.457067] [<0xffffffff>] <-
[399847.460178] [<0xffffffff>] <-
[399847.463396] [<0xffffffff>] <-
[399847.466458] [<0xffffffff>] <-
[399847.469654] [<0xffffffff>] <-
[399847.472807] [<0xffffffff>] <-
[399847.475940] [<0xffffffff>] <-
[399847.479237] [<0xffffffff>] <-
[399847.482427] [<0xffffffff>] <-
[399847.485595] [<0x3c1a8210>] <-
[399847.488766] [<0x275ad000>] <-
[399847.492116] [<0x3c1b2000>] <-
[399847.495291] [<0x35bd025>] <-
[399847.498381] [<0x241b01fc>] <-
[399847.501675] [<0x35bd023>] <-
[399847.504775] [<0xaf40fffc>] <-
[399847.507953] [<0x10000001>] <-
[399847.511308] heart_beat restart over. count 1
[399847.517465] hb-fmac 17800000.wifi-hb wlan1: restart Del sta 49 (88:54:1f:4c:f8:18)
[399847.525371] remove STA 88:54:1f:4c:f8:18 from hash table success
[399847.531737] hb-fmac 17800000.wifi-hb wlan1: restart Del sta 51 (dc:fb:48:0d:85:81)
[399847.539604] remove STA dc:fb:48:0d:85:81 from hash table success
[399847.546111] lmac_glue_stop(1)
[399847.549458] stop_task, 1
[399847.552521] stop aresetn 2 por_resetn 1
[399847.556892] tkn[2020917] flags:001b result: 0 cmd:5132-ME_TRAFFIC_IND_REQ - reqcfm(5133-ME_TRAFFIC_IND_CFM)
[399847.567847] tkn[2020918] flags:001f result: 0 cmd:5132-ME_TRAFFIC_IND_REQ - reqcfm(5133-ME_TRAFFIC_IND_CFM)
[399847.580921] platform shutdown : 1
[399847.588144] tx headroom : 224, tx amsdu headroom : 50, rx headroom : 182, rx pd offset 224
[399847.600104] lmac_glue_start(1)
[399847.603299] start_task, 1
[399847.606057] task entry_addr=0x2000000
[399847.610011] start aresetn 0 por_resetn 0
[399847.614282] wait lmac init(1)>>>>>>>>>>>>>>>>>>>>>>>
Running ip a when this happens just hangs indefinitely. It's like the whole network stack just went down. The heart_beat restart over. count 1 line in the dmesg output seems to suggest that this is a heart-beat failure due to whatever is failing to pet the watchdog. It appears that the only way out of this is to do a reboot.
I'm running the Opal SFT1200 in AP mode. It connects to my pfSense main router via an ethernet backhaul. I'm also using the latest firmware, i.e. 4.3.19, at the time of this writing. Both 2.4GHz and 5GHz radios are enabled in my case.
Has anyone encountered this before? This is borderline annoying as it doesn't seem to be robust and needs baby-sitting every now and then. Yes. I know I could set-up a scheduled reboot. However, I would love to avoid that as I sometimes have long running sessions/operations in queue which depends on the continuous availability of the network; doing a scheduled reboot is disruptive.