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FS#3921 - WAVLINK WL-WN577A2 (Maginon WLR-755AC) still crashes under high load regulary #8916

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openwrt-bot opened this issue Jul 8, 2021 · 0 comments
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flyspray release/21.02

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@openwrt-bot openwrt-bot commented Jul 8, 2021

renegat:

Device problem occurs on: WAVLINK WL-WN577A2 / Maginon WL-755 / Winstars WS-WN577A2 / Winstars WS-WN566A2 (MT7628AN)

Software versions of OpenWrt/LEDE release, packages, etc.:
all released till now! (testet lately with 20.01-rc3-snapshot again)

Problem:

The WLR755AC-Device regulary crashes under high load (LAN -> WLAN) when using OpenWRT (latest 20.01-rc3 snapshot).
Using the stock firmware the issue does not occur.

With normal or low load the device works relieable and stable.

But when put under high load like playing a fullhd video, copying a lot of data and iperf simultaneously over WLAN the device will crash after a while.
The surface of the case will get palpable warm.

As there are only (too) very few venting holes on the downside of the device I assumed this could be the cause for the crash. It is not I proofed:

I opened the case (two screws on the bottom and four plastic clamps, two on very long side, sits very tight but can be removed without breaking the brackets if you work carful) and tried again with the case open:

Too put load on the device I copied a 3GB directory with mp3 files and startet iperf:

Device crashed after a few minutes, wlan does not come up again. Had to hard-reset (powercycle).

Active cooling:

Put a big office-fan right in front of the opened device:

Same result, device crashed after a few minutes but wlan came back by itself this time.

So the issue is NOT related to overheating but to some bug relatet to OpenWRT.

# iperf -c 192.168.200.14 -i 5 -t300 [ 3] 215.0-220.0 sec 34.2 MBytes 57.5 Mbits/sec [ 3] 220.0-225.0 sec 34.2 MBytes 57.5 Mbits/sec [ 3] 225.0-230.0 sec 28.0 MBytes 46.9 Mbits/sec [ 3] 230.0-235.0 sec 1.12 MBytes 1.88 Mbits/sec [ 3] 235.0-240.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 240.0-245.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 245.0-250.0 sec 0.00 Bytes 0.00 bits/sec
@aparcar aparcar added the release/21.02 label Feb 22, 2022
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