FS#3332 - packet loss on miwifi-mini @ 19.07.4

[openwrt-bot]

sergio:

mt7620 / miwifi-mini
19.07.3 works fine
19.07.4 works bad:

kern.err kernel: [ 6615.438086] mtk_soc_eth 10100000.ethernet eth0: transmit timed out
kern.info kernel: [ 6615.444416] mtk_soc_eth 10100000.ethernet eth0: dma_cfg:80000065
kern.info kernel: [ 6615.450586] mtk_soc_eth 10100000.ethernet eth0: tx_ring=0, base=07780000, max=1024, ctx=17, dtx=17, fdx=16, next=17
kern.info kernel: [ 6615.461258] mtk_soc_eth 10100000.ethernet eth0: rx_ring=0, base=06408000, max=1024, calc=47, drx=48
kern.err kernel: [ 6619.306350] mtk_soc_eth 10100000.ethernet eth0: transmit timed out
kern.info kernel: [ 6619.312684] mtk_soc_eth 10100000.ethernet eth0: dma_cfg:80000065
kern.info kernel: [ 6619.318854] mtk_soc_eth 10100000.ethernet eth0: tx_ring=0, base=07780000, max=1024, ctx=28, dtx=28, fdx=16, next=28
kern.info kernel: [ 6619.329525] mtk_soc_eth 10100000.ethernet eth0: rx_ring=0, base=06470000, max=1024, calc=63, drx=64
kern.err kernel: [ 6623.157217] mtk_soc_eth 10100000.ethernet eth0: transmit timed out
kern.info kernel: [ 6623.163553] mtk_soc_eth 10100000.ethernet eth0: dma_cfg:80000065
kern.info kernel: [ 6623.169720] mtk_soc_eth 10100000.ethernet eth0: tx_ring=0, base=07780000, max=1024, ctx=25, dtx=25, fdx=16, next=25
kern.info kernel: [ 6623.180398] mtk_soc_eth 10100000.ethernet eth0: rx_ring=0, base=06408000, max=1024, calc=59, drx=60


[openwrt-bot]

bjonglez:

Looking at the changes since 19.07.3, I would guess the regression comes from https://git.openwrt.org/7ac454014a11347887323a131415ac7032d53546

You can try reverting this commit on top of the openwrt-19.07, and if this works, contact the author.

[openwrt-bot]

sergio:

kern.warn kernel: [15991.872064] ------------[ cut here ]------------ kern.warn kernel: [15991.876807] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:320 0x802c39c0 kern.info kernel: [15991.884021] NETDEV WATCHDOG: eth0 (mtk_soc_eth): transmit queue 0 timed out kern.warn kernel: [15991.891121] Modules linked in: rt2800soc rt2800mmio rt2800lib rt2x00soc rt2x00mmio rt2x00lib mt76x2e mt76x2_common mt76x02_lib mt76 mac80211 cfg80211 crc_ccitt compat leds_gpio ohci_platform ohci_hcd ehci_platform ehci_hcd gpio_button_hotplug usbcore nls_base usb_common kern.warn kernel: [15991.915603] CPU: 0 PID: 0 Comm: swapper Not tainted 4.14.195 #0 kern.warn kernel: [15991.921645] Stack : 8046dee0 80054358 80480000 8042d258 00000000 00000000 00000000 00000000 kern.warn kernel: [15991.930210] 00000000 00000000 00000000 00000000 00000000 00000001 87c07de0 ac07f5da kern.warn kernel: [15991.938770] 87c07e78 00000000 00000000 00004570 00000038 803ccd58 00000008 00000000 kern.warn kernel: [15991.947322] 00000000 80460000 000df893 00000000 87c07dc0 00000000 00000000 8042710c kern.warn kernel: [15991.955875] 802c39c0 00000140 8046df34 8046def4 00000002 80213fc0 00000000 805b0000 kern.warn kernel: [15991.964424] ... kern.warn kernel: [15991.966920] Call Trace: kern.warn kernel: [15991.966932] [<80054358>] 0x80054358 kern.warn kernel: [15991.973003] [<803ccd58>] 0x803ccd58 kern.warn kernel: [15991.976563] [<802c39c0>] 0x802c39c0 kern.warn kernel: [15991.980120] [<80213fc0>] 0x80213fc0 kern.warn kernel: [15991.983702] [<8000aa50>] 0x8000aa50 kern.warn kernel: [15991.987259] [<8000aa58>] 0x8000aa58 kern.warn kernel: [15991.990817] [<80026480>] 0x80026480 kern.warn kernel: [15991.994388] [<802c39c0>] 0x802c39c0 kern.warn kernel: [15991.997948] [<80026508>] 0x80026508 kern.warn kernel: [15992.001503] [<8026c120>] 0x8026c120 kern.warn kernel: [15992.005079] [<802c39c0>] 0x802c39c0 kern.warn kernel: [15992.008639] [<802c385c>] 0x802c385c kern.warn kernel: [15992.012210] [<8005ffcc>] 0x8005ffcc kern.warn kernel: [15992.015766] [<800012fc>] 0x800012fc kern.warn kernel: [15992.019333] [<800601a0>] 0x800601a0 kern.warn kernel: [15992.022905] [<8029d484>] 0x8029d484 kern.warn kernel: [15992.026469] [<803d2808>] 0x803d2808 kern.warn kernel: [15992.030031] [<8005a554>] 0x8005a554 kern.warn kernel: [15992.033601] [<80055ab0>] 0x80055ab0 kern.warn kernel: [15992.037165] [<80005e90>] 0x80005e90 kern.warn kernel: [15992.040718] kern.warn kernel: [15992.042250] ---[ end trace 88bb17f34977c36c ]---

[openwrt-bot]

sipples:

I'm seeing this same problem with OpenWrt 19.07.4 on an Asus RT-N56U (first hardware revision) wireless router. The problem does not occur with 19.07.3. It's the same pattern that Sergio observed, with error messages in the kernel log from mtk_soc_eth. Specifically, the 1000BASE-T/full duplex Ethernet connection between the WAN port and the upstream fiber Internet box periodically resets (in the Asus RT-N56U), with service interruptions lasting several seconds at least, typically causing Web browsing and streaming media timeouts on the wireless client side. I tried a cable swap to see if that'd help, but it didn't.

Sergio, have you heard anything from the author of that patch? Any additional troubleshooting beyond what I can confirm so far? It doesn't seem like a well considered patch from the author's description.

[openwrt-bot]

Linaro1985:

You can try reverting this commit on top of the openwrt-19.07, and if this works

I can confirm. After rolling back the commit, the problem does not recur.

[openwrt-bot]

Jakdaw:

I can confirm the same - had identical problem with my Mi Wifi Mini - reverting 7ac4540 and rebuilding 19.07.4 and so far it seems like no further occurences.

[openwrt-bot]

jcschauer:

I can confirm the same behavior with my ASUS_RT-N56U. 19.07.4 is bad 19.07.3 is good so far.

[openwrt-bot]

bjonglez:

The commit has been reverted. Next 19.07 release will not have the issue.

[openwrt-bot]

freed00m:

The Asus RT-AC51U also affected.

EDIT: thx 19.07.5 works fine