FS#48912 - [linux-lts] Kernel error: ath: DMA failed to stop in 10 ms

Attached to Project: Arch Linux
Opened by Stanislav (Stanislav_pythonist) - Tuesday, 12 April 2016, 15:55 GMT
Last edited by Andreas Radke (AndyRTR) - Wednesday, 13 April 2016, 12:26 GMT
Task Type Bug Report
Category Kernel
Status Closed
Assigned To Andreas Radke (AndyRTR)
Architecture x86_64
Severity Medium
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 2
Private No

Details

Description:
Kernel error that happens periodically (once a day or two)

Always with exact same message(on this kernel 4.1.20-1-lts):
dmesg >
[ 4278.580873] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x0000a400
[ 4278.580906] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[ 4278.590816] ath: phy0: Failed to stop TX DMA, queues=0x008!
....
[37232.420988] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x0000a400
[37232.421017] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[37232.440964] ath: phy0: Failed to stop TX DMA, queues=0x00a!

Additional info:
uname -r == 4.1.20-1-lts

Maybe important info:
I use firewire sound card (TC Konnekt 6) via jack2dbus+ffado and all the time when this error occurs sound stop working and i must restart jack daemon.

Other versions of kernel is affected too. I don't remember on what versions i saved this logs, but maybe they help to figure out where the problem is, so i attach them too.
This task depends upon

Closed by  Andreas Radke (AndyRTR)
Wednesday, 13 April 2016, 12:26 GMT
Reason for closing:  Won't fix
Comment by Stanislav (Stanislav_pythonist) - Tuesday, 12 April 2016, 15:58 GMT
Few other kernel versions logs attached
   other_kernels.log (3.3 KiB)
Comment by Andreas Radke (AndyRTR) - Wednesday, 13 April 2016, 10:58 GMT
Do you see the same problem in linux 4.4.x and 4.5 tree or is it -lts 4.1.x specific?

It's an upstream issue in any way.
Comment by Jan de Groot (JGC) - Wednesday, 13 April 2016, 11:49 GMT
I recognize the same error from OpenWRT routers with ath9k drivers.

https://dev.openwrt.org/browser/trunk/package/kernel/mac80211/patches/393-ath9k-make-DMA-stop-related-messages-debug-only.patch?rev=46158

According to this patch (AFAIK also applied in recent kernels), this is a debug message that is quite harmless. With an unpatched kernel, you'll see these messages from time to time when there's much traffic on the channel that your wireless network uses.

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