* Audio interface causing "xhci_hcd ... WARN: buffer overrun event" messages
@ 2025-07-30 20:02 Bob Ham
2025-07-31 8:17 ` Michał Pecio
0 siblings, 1 reply; 9+ messages in thread
From: Bob Ham @ 2025-07-30 20:02 UTC (permalink / raw)
To: linux-usb
[-- Attachment #1.1: Type: text/plain, Size: 1492 bytes --]
Hi there,
I'm trying to get an Arturia AudioFuse 16Rig audio interface working
under Linux. During loading of snd-usb-audio and when trying to play
through the interface, the kernel spews a whole bunch of messages like so:
[ 1667.208402] xhci_hcd 0000:00:14.0: WARN: buffer overrun event for
slot 3 ep 2 on endpoint
[ 1667.216585] xhci_hcd 0000:00:14.0: WARN: buffer overrun event for
slot 3 ep 2 on endpoint
[ 1667.224778] xhci_hcd 0000:00:14.0: WARN: buffer overrun event for
slot 3 ep 2 on endpoint
When trying to play, there is nothing from the audio outputs on the
interface and aplay reports:
$ aplay -D hw:CARD=Audio,DEV=0 output.wav
Playing WAVE 'output.wav' : Signed 32 bit Little Endian, Rate 48000 Hz,
Channels 10
aplay: pcm_write:2127: write error: Input/output error
I don't really know anything about XHCI so I was wondering if someone
could advise me on what might be causing the error messages?
I followed some instructions from this list⁰ on enabling logs and traces
which might help shed some light. Here is the kernel log (which
includes some debugging statements I added):
https://settrans.net/~rah/misc/xhci-kernel-log.txt
And here is the contents of /sys/kernel/debug/tracing/trace which
unfortunately looks empty, I'm wondering if the instructions I followed
are still valid?
https://settrans.net/~rah/misc/xhci-kernel-trace.txt
Thanks,
Bob Ham
⁰https://lore.kernel.org/linux-usb/?t=20190409143433
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Audio interface causing "xhci_hcd ... WARN: buffer overrun event" messages
2025-07-30 20:02 Audio interface causing "xhci_hcd ... WARN: buffer overrun event" messages Bob Ham
@ 2025-07-31 8:17 ` Michał Pecio
2025-07-31 8:27 ` Michał Pecio
` (2 more replies)
0 siblings, 3 replies; 9+ messages in thread
From: Michał Pecio @ 2025-07-31 8:17 UTC (permalink / raw)
To: Bob Ham; +Cc: linux-usb
Hi,
The 6.12 kernel series is half year old, so this may be unique to your
hardware. Can you try other (ideally similar) UAC devices in the same
USB port, or this device with different xHCI (or EHCI) controllers?
On Wed, 30 Jul 2025 21:02:24 +0100, Bob Ham wrote:
> I'm trying to get an Arturia AudioFuse 16Rig audio interface working
> under Linux. During loading of snd-usb-audio and when trying to play
> through the interface, the kernel spews a whole bunch of messages
> like so:
>
> [ 1667.208402] xhci_hcd 0000:00:14.0: WARN: buffer overrun event for
> slot 3 ep 2 on endpoint
> [ 1667.216585] xhci_hcd 0000:00:14.0: WARN: buffer overrun event for
> slot 3 ep 2 on endpoint
> [ 1667.224778] xhci_hcd 0000:00:14.0: WARN: buffer overrun event for
> slot 3 ep 2 on endpoint
"ep 2" means "ep index 2", which is USB endpoint 0x81 aka EP 1 IN.
So this is caused by recording, or maybe by playback while recording,
but not by playback alone.
At face value, "buffer overrun" means that the device sends a packet
which doesn't exceed the endpoint's limit (that would be babble), but
exceeds the data buffer submitted by the UAC driver. In the snippet
above, it seems to be happening regularly every 65 USB microframes.
It could be a UAC issue, or it could still be an xHCI issue if buffer
size is miscommunicated to the hardware or misunderstood by it.
Can you mount debugfs and see if you can find the directory below? It
would tell if there is anything unusual about those 1 in 65 buffers.
/sys/kernel/debug/usb/xhci/0000:00:14.0/
Regards,
Michal
^ permalink raw reply [flat|nested] 9+ messages in thread* Re: Audio interface causing "xhci_hcd ... WARN: buffer overrun event" messages
2025-07-31 8:17 ` Michał Pecio
@ 2025-07-31 8:27 ` Michał Pecio
2025-07-31 10:11 ` Robert Ham
2025-07-31 9:56 ` Robert Ham
2025-07-31 10:04 ` Robert Ham
2 siblings, 1 reply; 9+ messages in thread
From: Michał Pecio @ 2025-07-31 8:27 UTC (permalink / raw)
To: Bob Ham; +Cc: linux-usb
On Thu, 31 Jul 2025 10:17:20 +0200, Michał Pecio wrote:
> "ep 2" means "ep index 2", which is USB endpoint 0x81 aka EP 1 IN.
> So this is caused by recording, or maybe by playback while recording,
> but not by playback alone.
Apologies, I forgot that some UAC modes may use additional "feedback"
endpoints so it could still be a playback thing.
Can you post "lsusb -v" for this device?
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Audio interface causing "xhci_hcd ... WARN: buffer overrun event" messages
2025-07-31 8:27 ` Michał Pecio
@ 2025-07-31 10:11 ` Robert Ham
2025-07-31 14:26 ` Mathias Nyman
0 siblings, 1 reply; 9+ messages in thread
From: Robert Ham @ 2025-07-31 10:11 UTC (permalink / raw)
To: Michał Pecio; +Cc: linux-usb
[-- Attachment #1.1: Type: text/plain, Size: 22349 bytes --]
I managed to sort out the tracing and debug output. Updated kernel log
and trace:
https://settrans.net/~rah/misc/xhci-kernel-log-2.txt
https://settrans.net/~rah/misc/xhci-kernel-trace-2.txt
On 31/07/2025 09:27, Michał Pecio wrote:
> Can you post "lsusb -v" for this device?
Bus 003 Device 004: ID 1c75:af20 Arturia AF16Rig Audio
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x1c75 Arturia
idProduct 0xaf20
bcdDevice 2.01
iManufacturer 1 ARTURIA
iProduct 3 AF16Rig Audio
iSerial 2 8850400254010429
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x02e2
bNumInterfaces 4
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 3
bFunctionClass 1 Audio
bFunctionSubClass 0
bFunctionProtocol 32
iFunction 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 1 Control Device
bInterfaceProtocol 32
iInterface 3
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 2.00
bCategory 8
wTotalLength 0x0190
bmControls 0x00
AudioControl Interface Descriptor:
bLength 8
bDescriptorType 36
bDescriptorSubtype 10 (CLOCK_SOURCE)
bClockID 41
bmAttributes 3 Internal programmable clock
bmControls 0x07
Clock Frequency Control (read/write)
Clock Validity Control (read-only)
bAssocTerminal 0
iClockSource 9
AudioControl Interface Descriptor:
bLength 8
bDescriptorType 36
bDescriptorSubtype 10 (CLOCK_SOURCE)
bClockID 43
bmAttributes 0 External clock
bmControls 0x07
Clock Frequency Control (read/write)
Clock Validity Control (read-only)
bAssocTerminal 0
iClockSource 10
AudioControl Interface Descriptor:
bLength 8
bDescriptorType 36
bDescriptorSubtype 10 (CLOCK_SOURCE)
bClockID 44
bmAttributes 0 External clock
bmControls 0x07
Clock Frequency Control (read/write)
Clock Validity Control (read-only)
bAssocTerminal 0
iClockSource 11
AudioControl Interface Descriptor:
bLength 10
bDescriptorType 36
bDescriptorSubtype 11 (CLOCK_SELECTOR)
bClockID 40
bNrInPins 3
baCSourceID(0) 41
baCSourceID(1) 43
baCSourceID(2) 44
bmControls 0x03
Clock Selector Control (read/write)
iClockSelector 8
AudioControl Interface Descriptor:
bLength 17
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 2
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bCSourceID 40
bNrChannels 34
bmChannelConfig 0x00000000
iChannelNames 13
bmControls 0x0000
iTerminal 6
AudioControl Interface Descriptor:
bLength 146
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 12
bSourceID 2
bmaControls(0) 0x00000000
bmaControls(1) 0x00000000
bmaControls(2) 0x00000000
bmaControls(3) 0x00000000
bmaControls(4) 0x00000000
bmaControls(5) 0x00000000
bmaControls(6) 0x00000000
bmaControls(7) 0x00000000
bmaControls(8) 0x00000000
bmaControls(9) 0x00000000
bmaControls(10) 0x00000000
bmaControls(11) 0x00000000
bmaControls(12) 0x00000000
bmaControls(13) 0x00000000
bmaControls(14) 0x00000000
bmaControls(15) 0x00000000
bmaControls(16) 0x00000000
bmaControls(17) 0x00000000
bmaControls(18) 0x00000000
bmaControls(19) 0x00000000
bmaControls(20) 0x00000000
bmaControls(21) 0x00000000
bmaControls(22) 0x00000000
bmaControls(23) 0x00000000
bmaControls(24) 0x00000000
bmaControls(25) 0x00000000
bmaControls(26) 0x00000000
bmaControls(27) 0x00000000
bmaControls(28) 0x00000000
bmaControls(29) 0x00000000
bmaControls(30) 0x00000000
bmaControls(31) 0x00000000
bmaControls(32) 0x00000000
bmaControls(33) 0x00000000
bmaControls(34) 0x00000000
iFeature 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 20
wTerminalType 0x0301 Speaker
bAssocTerminal 0
bSourceID 12
bCSourceID 40
bmControls 0x0000
iTerminal 0
AudioControl Interface Descriptor:
bLength 17
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0201 Microphone
bAssocTerminal 0
bCSourceID 40
bNrChannels 34
bmChannelConfig 0x00000000
iChannelNames 47
bmControls 0x0000
iTerminal 0
AudioControl Interface Descriptor:
bLength 146
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 11
bSourceID 1
bmaControls(0) 0x00000000
bmaControls(1) 0x00000000
bmaControls(2) 0x00000000
bmaControls(3) 0x00000000
bmaControls(4) 0x00000000
bmaControls(5) 0x00000000
bmaControls(6) 0x00000000
bmaControls(7) 0x00000000
bmaControls(8) 0x00000000
bmaControls(9) 0x00000000
bmaControls(10) 0x00000000
bmaControls(11) 0x00000000
bmaControls(12) 0x00000000
bmaControls(13) 0x00000000
bmaControls(14) 0x00000000
bmaControls(15) 0x00000000
bmaControls(16) 0x00000000
bmaControls(17) 0x00000000
bmaControls(18) 0x00000000
bmaControls(19) 0x00000000
bmaControls(20) 0x00000000
bmaControls(21) 0x00000000
bmaControls(22) 0x00000000
bmaControls(23) 0x00000000
bmaControls(24) 0x00000000
bmaControls(25) 0x00000000
bmaControls(26) 0x00000000
bmaControls(27) 0x00000000
bmaControls(28) 0x00000000
bmaControls(29) 0x00000000
bmaControls(30) 0x00000000
bmaControls(31) 0x00000000
bmaControls(32) 0x00000000
bmaControls(33) 0x00000000
bmaControls(34) 0x00000000
iFeature 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 22
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 11
bCSourceID 40
bmControls 0x0000
iTerminal 7
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0006 1x 6 bytes
bInterval 8
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4
AudioStreaming Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 2
bmControls 0x05
Active Alternate Setting Control (read-only)
Valid Alternate Setting Control (read-only)
bFormatType 1
bmFormats 0x00000001
PCM
bNrChannels 34
bmChannelConfig 0x00000000
iChannelNames 13
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 24
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x03b8 1x 952 bytes
bInterval 1
AudioStreaming Endpoint Descriptor:
bLength 8
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bmControls 0x00
bLockDelayUnits 1 Milliseconds
wLockDelay 0x0200
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 2
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4
AudioStreaming Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 2
bmControls 0x05
Active Alternate Setting Control (read-only)
Valid Alternate Setting Control (read-only)
bFormatType 1
bmFormats 0x00000001
PCM
bNrChannels 18
bmChannelConfig 0x00000000
iChannelNames 13
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 24
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x03a8 1x 936 bytes
bInterval 1
AudioStreaming Endpoint Descriptor:
bLength 8
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bmControls 0x00
bLockDelayUnits 1 Milliseconds
wLockDelay 0x0200
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 3
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4
AudioStreaming Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 2
bmControls 0x05
Active Alternate Setting Control (read-only)
Valid Alternate Setting Control (read-only)
bFormatType 1
bmFormats 0x00000001
PCM
bNrChannels 10
bmChannelConfig 0x00000000
iChannelNames 13
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 24
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x03e8 1x 1000 bytes
bInterval 1
AudioStreaming Endpoint Descriptor:
bLength 8
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bmControls 0x00
bLockDelayUnits 1 Milliseconds
wLockDelay 0x0200
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 5
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 5
AudioStreaming Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 22
bmControls 0x05
Active Alternate Setting Control (read-only)
Valid Alternate Setting Control (read-only)
bFormatType 1
bmFormats 0x00000001
PCM
bNrChannels 34
bmChannelConfig 0x00000000
iChannelNames 47
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 24
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 37
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Implicit feedback Data
wMaxPacketSize 0x03b8 1x 952 bytes
bInterval 1
AudioStreaming Endpoint Descriptor:
bLength 8
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bmControls 0x00
bLockDelayUnits 1 Milliseconds
wLockDelay 0x0200
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 2
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 5
AudioStreaming Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 22
bmControls 0x05
Active Alternate Setting Control (read-only)
Valid Alternate Setting Control (read-only)
bFormatType 1
bmFormats 0x00000001
PCM
bNrChannels 18
bmChannelConfig 0x00000000
iChannelNames 47
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 24
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 37
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Implicit feedback Data
wMaxPacketSize 0x03a8 1x 936 bytes
bInterval 1
AudioStreaming Endpoint Descriptor:
bLength 8
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bmControls 0x00
bLockDelayUnits 1 Milliseconds
wLockDelay 0x0200
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 3
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 5
AudioStreaming Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 22
bmControls 0x05
Active Alternate Setting Control (read-only)
Valid Alternate Setting Control (read-only)
bFormatType 1
bmFormats 0x00000001
PCM
bNrChannels 10
bmChannelConfig 0x00000000
iChannelNames 47
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 24
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 37
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Implicit feedback Data
wMaxPacketSize 0x03e8 1x 1000 bytes
bInterval 1
AudioStreaming Endpoint Descriptor:
bLength 8
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bmControls 0x00
bLockDelayUnits 1 Milliseconds
wLockDelay 0x0200
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 254 Application Specific Interface
bInterfaceSubClass 1 Device Firmware Update
bInterfaceProtocol 1
iInterface 12
Device Firmware Upgrade Interface Descriptor:
bLength 9
bDescriptorType 33
bmAttributes 7
Will Not Detach
Manifestation Tolerant
Upload Supported
Download Supported
wDetachTimeout 250 milliseconds
wTransferSize 64 bytes
bcdDFUVersion 1.10
Cheers,
Bob
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^ permalink raw reply [flat|nested] 9+ messages in thread* Re: Audio interface causing "xhci_hcd ... WARN: buffer overrun event" messages
2025-07-31 10:11 ` Robert Ham
@ 2025-07-31 14:26 ` Mathias Nyman
2025-08-02 8:43 ` Robert Ham
0 siblings, 1 reply; 9+ messages in thread
From: Mathias Nyman @ 2025-07-31 14:26 UTC (permalink / raw)
To: Robert Ham, Michał Pecio; +Cc: linux-usb
On 31.7.2025 13.11, Robert Ham wrote:
> I managed to sort out the tracing and debug output. Updated kernel log
> and trace:
>
> https://settrans.net/~rah/misc/xhci-kernel-log-2.txt
>
> https://settrans.net/~rah/misc/xhci-kernel-trace-2.txt
>
>
> On 31/07/2025 09:27, Michał Pecio wrote:
>
>> Can you post "lsusb -v" for this device?
>
Looks like The lengths and offsets in the URB, passed by audio driver does
not match the transfer sizes the device reports it will send.
The audio device reports its isoc endpoint will send 1000 bytes
every 125 microseconds:
(from your lsusb)
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x81 EP 1 IN
> bmAttributes 37
> Transfer Type Isochronous
> Synch Type Asynchronous
> Usage Type Implicit feedback Data
> wMaxPacketSize 0x03e8 1x 1000 bytes
> bInterval 1
Trace shows xhci sets up the endpoint correctly,
expecting 1000 bytes every 125 mictoseconds:
pulseaudio-1435 [000] ..... 55.126749: xhci_ring_alloc: ISOC 00000000c42321b6: enq 0x00000002483a2000(0x00000002483a2000) deq 0x00000002483a2000(0x00000002483a2000) segs 2 stream 0 bounce 1000 cycle 1
pulseaudio-1435 [000] ..... 55.126750: xhci_add_endpoint: State disabled mult 1 max P. Streams 0 interval 125 us max ESIT payload 1000 CErr 0 Type Isoc IN burst 0 maxp 1000 deq 00000002483a2001 avg trb len 1000
but the URB queued from class driver to xhci doesn't match this.
Looks like one URB contains 8 isoc transfers, (one filled every 125us) but URB expects
only 2880 bytes in total, leading to only 360 bytes per isoc transfer.
I'd take a closer look at the values filled by the audio driver to the
struct usb_iso_packet_descriptor iso_frame_desc[] array, and number_of_packets
in the URB
usbmon might show these, don't remember if it shows all isoc related fields
Trace shoes the URB turned into Isoc TRBs of 360 bytes by xhci driver.
Notice that the Buffer address also increases only by 360 bytes (0x168)
55.198885: xhci_urb_enqueue: 3-5.1 ep1in-isoc: urb 0000000052d17659 pipe 33920 slot 3 length 0/2880 sgs 0/0 stream 0 flags 00000204
55.198892: xhci_queue_trb: ISOC: Buffer 0000000104735000 length 360 TD size 0 intr 0 type 'Isoch' flags B:i:I:c:s:I:e:c
55.198892: xhci_inc_enq: ISOC 00000000c42321b6: enq 0x00000002483a2010(0x00000002483a2000) deq 0x00000002483a2000(0x00000002483a2000) segs 2 stream 0 bounce 1000 cycle 1
55.198894: xhci_queue_trb: ISOC: Buffer 0000000104735168 length 360 TD size 0 intr 0 type 'Isoch' flags B:i:I:c:s:I:e:C
55.198894: xhci_inc_enq: ISOC 00000000c42321b6: enq 0x00000002483a2020(0x00000002483a2000) deq 0x00000002483a2000(0x00000002483a2000) segs 2 stream 0 bounce 1000 cycle 1
55.198895: xhci_queue_trb: ISOC: Buffer 00000001047352d0 length 360 TD size 0 intr 0 type 'Isoch' flags B:i:I:c:s:I:e:C
55.198896: xhci_inc_enq: ISOC 00000000c42321b6: enq 0x00000002483a2030(0x00000002483a2000) deq 0x00000002483a2000(0x00000002483a2000) segs 2 stream 0 bounce 1000 cycle 1
55.198897: xhci_queue_trb: ISOC: Buffer 0000000104735438 length 360 TD size 0 intr 0 type 'Isoch' flags B:i:I:c:s:I:e:C
55.198897: xhci_inc_enq: ISOC 00000000c42321b6: enq 0x00000002483a2040(0x00000002483a2000) deq 0x00000002483a2000(0x00000002483a2000) segs 2 stream 0 bounce 1000 cycle 1
55.198899: xhci_queue_trb: ISOC: Buffer 00000001047355a0 length 360 TD size 0 intr 0 type 'Isoch' flags B:i:I:c:s:I:e:C
55.198899: xhci_inc_enq: ISOC 00000000c42321b6: enq 0x00000002483a2050(0x00000002483a2000) deq 0x00000002483a2000(0x00000002483a2000) segs 2 stream 0 bounce 1000 cycle 1
55.198900: xhci_queue_trb: ISOC: Buffer 0000000104735708 length 360 TD size 0 intr 0 type 'Isoch' flags B:i:I:c:s:I:e:C
55.198900: xhci_inc_enq: ISOC 00000000c42321b6: enq 0x00000002483a2060(0x00000002483a2000) deq 0x00000002483a2000(0x00000002483a2000) segs 2 stream 0 bounce 1000 cycle 1
55.198901: xhci_queue_trb: ISOC: Buffer 0000000104735870 length 360 TD size 0 intr 0 type 'Isoch' flags B:i:I:c:s:I:e:C
55.198902: xhci_inc_enq: ISOC 00000000c42321b6: enq 0x00000002483a2070(0x00000002483a2000) deq 0x00000002483a2000(0x00000002483a2000) segs 2 stream 0 bounce 1000 cycle 1
55.198903: xhci_queue_trb: ISOC: Buffer 00000001047359d8 length 360 TD size 0 intr 0 type 'Isoch' flags b:i:I:c:s:I:e:C
55.198903: xhci_inc_enq: ISOC 00000000c42321b6: enq 0x00000002483a2080(0x00000002483a2000) deq 0x00000002483a2000(0x00000002483a2000) segs 2 stream 0 bounce 1000 cycle 1
55.198903: xhci_ring_ep_doorbell: Ring doorbell for Slot 3 ep1in
The audio device probably sends the 1000 bytes per isoc tranfers as it stated, but
xhci expects 360 bytes, which leads to buffer overrun errors
55.213952: xhci_handle_event: EVENT: TRB 00000002483a2000 status 'Isoch Buffer Overrun' len 360 slot 3 ep 3 type 'Transfer Event' flags e:C
55.222154: xhci_handle_transfer: ISOC: Buffer 0000000104735000 length 360 TD size 0 intr 0 type 'Isoch' flags B:i:I:c:s:I:e:C
Thanks
Mathias
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Audio interface causing "xhci_hcd ... WARN: buffer overrun event" messages
2025-07-31 14:26 ` Mathias Nyman
@ 2025-08-02 8:43 ` Robert Ham
0 siblings, 0 replies; 9+ messages in thread
From: Robert Ham @ 2025-08-02 8:43 UTC (permalink / raw)
To: Mathias Nyman, Michał Pecio; +Cc: linux-usb
[-- Attachment #1.1: Type: text/plain, Size: 2365 bytes --]
On 31/07/2025 15:26, Mathias Nyman wrote:
> On 31.7.2025 13.11, Robert Ham wrote:
>> I managed to sort out the tracing and debug output. Updated kernel log
>> and trace:
>>
>> https://settrans.net/~rah/misc/xhci-kernel-log-2.txt
>>
>> https://settrans.net/~rah/misc/xhci-kernel-trace-2.txt
>>
>>
>> On 31/07/2025 09:27, Michał Pecio wrote:
>>
>>> Can you post "lsusb -v" for this device?
>>
>
> Looks like The lengths and offsets in the URB, passed by audio driver does
> not match the transfer sizes the device reports it will send.
>
> The audio device reports its isoc endpoint will send 1000 bytes
> every 125 microseconds:
> (from your lsusb)
>
>> Endpoint Descriptor:
>> bLength 7
>> bDescriptorType 5
>> bEndpointAddress 0x81 EP 1 IN
>> bmAttributes 37
>> Transfer Type Isochronous
>> Synch Type Asynchronous
>> Usage Type Implicit feedback Data
>> wMaxPacketSize 0x03e8 1x 1000 bytes
>> bInterval 1
>
> Trace shows xhci sets up the endpoint correctly,
> expecting 1000 bytes every 125 mictoseconds:
>
> pulseaudio-1435 [000] ..... 55.126749: xhci_ring_alloc: ISOC
> 00000000c42321b6: enq 0x00000002483a2000(0x00000002483a2000) deq
> 0x00000002483a2000(0x00000002483a2000) segs 2 stream 0 bounce 1000 cycle 1
> pulseaudio-1435 [000] ..... 55.126750: xhci_add_endpoint: State
> disabled mult 1 max P. Streams 0 interval 125 us max ESIT payload 1000
> CErr 0 Type Isoc IN burst 0 maxp 1000 deq 00000002483a2001 avg trb len 1000
>
> but the URB queued from class driver to xhci doesn't match this.
> Looks like one URB contains 8 isoc transfers, (one filled every 125us)
> but URB expects
> only 2880 bytes in total, leading to only 360 bytes per isoc transfer.
>
> I'd take a closer look at the values filled by the audio driver to the
> struct usb_iso_packet_descriptor iso_frame_desc[] array, and
> number_of_packets
> in the URB
Thanks for your response, that's really helpful.
Cheers,
Bob
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Audio interface causing "xhci_hcd ... WARN: buffer overrun event" messages
2025-07-31 8:17 ` Michał Pecio
2025-07-31 8:27 ` Michał Pecio
@ 2025-07-31 9:56 ` Robert Ham
2025-07-31 10:04 ` Robert Ham
2 siblings, 0 replies; 9+ messages in thread
From: Robert Ham @ 2025-07-31 9:56 UTC (permalink / raw)
To: Michał Pecio; +Cc: linux-usb
[-- Attachment #1.1: Type: text/plain, Size: 6966 bytes --]
Hi Michał,
On 31/07/2025 09:17, Michał Pecio wrote:
> Hi,
>
> The 6.12 kernel series is half year old, so this may be unique to your
> hardware. Can you try other (ideally similar) UAC devices in the same
> USB port, or this device with different xHCI (or EHCI) controllers?
I feel I should provide some background. I've been trying to get this
device working a while. I've tried it in various machines with various
kernel versions and a number of device firmware revisions as well. The
buffer overrun errors have appeared in different places, I don't think
it's specific to this machine's controller. Regardless, I'll do your
suggested tests to make certain and get back to you.
Also, there are other problems with both the kernel and the device that
I've had to work around to get to the point of the buffer overruns in
the current setup. Firstly, I needed to add a hack to snd-usb-audio to
stop it worrying about >32 channels in a feature unit descriptor. As I
understand it though, this is a kernel issue; >32 channels is allowed.
(Patch should be forthcoming.)
Secondly, the device seems to stop responding to a SET_INTERFACE request
when snd-usb-audio sends a bunch of those requests during initialisation
so I made it send just the last request and the device seems to be OK
with that, or at least doesn't stop responding. However, I wouldn't be
surprised if it's doing silly, spec-violating things in other places
too. The manufacturer has explicitly and comically stated: "Because the
16Rig is working on Mac without any driver, it means that it is class
compliant."
--
https://forum.arturia.com/t/is-audiofuse-16rig-usb-audio-class-compliant/2153/3
> Can you mount debugfs and see if you can find the directory below? It
> would tell if there is anything unusual about those 1 in 65 buffers.
>
> /sys/kernel/debug/usb/xhci/0000:00:14.0/
/sys/kernel/debug/usb/xhci/0000:00:14.0/
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port01
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port01/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port02
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port02/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port03
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port03/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port04
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port04/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port05
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port05/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port06
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port06/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port07
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port07/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port08
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port08/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port09
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port09/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port10
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port10/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port11
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port11/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port12
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port12/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port13
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port13/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port14
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port14/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port15
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port15/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port16
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port16/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep06
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep06/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep06/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep06/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep06/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep05
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep05/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep05/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep05/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep05/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep04
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep04/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep04/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep04/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep04/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep03
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep03/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep03/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep03/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep03/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep02
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep02/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep02/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep02/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep02/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep-context
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/slot-context
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/name
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep00
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep00/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep00/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep00/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep00/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/event-ring
/sys/kernel/debug/usb/xhci/0000:00:14.0/event-ring/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/event-ring/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/event-ring/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/event-ring/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/command-ring
/sys/kernel/debug/usb/xhci/0000:00:14.0/command-ring/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/command-ring/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/command-ring/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/command-ring/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-ext-dbc:00
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-ext-protocol:01
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-ext-protocol:00
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-ext-legsup:00
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-runtime
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-op
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-cap
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Audio interface causing "xhci_hcd ... WARN: buffer overrun event" messages
2025-07-31 8:17 ` Michał Pecio
2025-07-31 8:27 ` Michał Pecio
2025-07-31 9:56 ` Robert Ham
@ 2025-07-31 10:04 ` Robert Ham
2025-07-31 20:21 ` Michał Pecio
2 siblings, 1 reply; 9+ messages in thread
From: Robert Ham @ 2025-07-31 10:04 UTC (permalink / raw)
To: Michał Pecio; +Cc: linux-usb
[-- Attachment #1.1: Type: text/plain, Size: 8297 bytes --]
On 31/07/2025 09:17, Michał Pecio wrote:
> Can you mount debugfs and see if you can find the directory below? It
> would tell if there is anything unusual about those 1 in 65 buffers.
>
> /sys/kernel/debug/usb/xhci/0000:00:14.0/
Umm.. and this is with the device connected and snd-usb-audio loaded,
which might be more helpful :-)
/sys/kernel/debug/usb/xhci/0000:00:14.0/
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port01
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port01/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port02
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port02/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port03
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port03/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port04
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port04/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port05
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port05/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port06
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port06/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port07
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port07/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port08
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port08/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port09
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port09/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port10
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port10/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port11
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port11/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port12
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port12/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port13
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port13/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port14
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port14/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port15
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port15/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port16
/sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port16/portsc
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep03
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep03/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep03/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep03/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep03/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep02
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep02/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep02/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep02/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep02/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep-context
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/slot-context
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/name
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep00
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep00/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep00/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep00/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/04/ep00/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03/ep04
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03/ep04/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03/ep04/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03/ep04/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03/ep04/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03/ep-context
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03/slot-context
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03/name
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03/ep00
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03/ep00/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03/ep00/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03/ep00/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/03/ep00/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02/ep02
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02/ep02/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02/ep02/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02/ep02/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02/ep02/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02/ep-context
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02/slot-context
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02/name
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02/ep00
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02/ep00/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02/ep00/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02/ep00/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/02/ep00/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep06
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep06/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep06/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep06/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep06/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep05
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep05/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep05/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep05/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep05/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep04
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep04/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep04/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep04/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep04/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep03
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep03/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep03/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep03/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep03/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep02
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep02/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep02/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep02/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep02/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep-context
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/slot-context
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/name
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep00
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep00/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep00/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep00/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/devices/01/ep00/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/event-ring
/sys/kernel/debug/usb/xhci/0000:00:14.0/event-ring/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/event-ring/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/event-ring/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/event-ring/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/command-ring
/sys/kernel/debug/usb/xhci/0000:00:14.0/command-ring/trbs
/sys/kernel/debug/usb/xhci/0000:00:14.0/command-ring/cycle
/sys/kernel/debug/usb/xhci/0000:00:14.0/command-ring/dequeue
/sys/kernel/debug/usb/xhci/0000:00:14.0/command-ring/enqueue
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-ext-dbc:00
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-ext-protocol:01
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-ext-protocol:00
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-ext-legsup:00
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-runtime
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-op
/sys/kernel/debug/usb/xhci/0000:00:14.0/reg-cap
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Audio interface causing "xhci_hcd ... WARN: buffer overrun event" messages
2025-07-31 10:04 ` Robert Ham
@ 2025-07-31 20:21 ` Michał Pecio
0 siblings, 0 replies; 9+ messages in thread
From: Michał Pecio @ 2025-07-31 20:21 UTC (permalink / raw)
To: Robert Ham; +Cc: linux-usb
On Thu, 31 Jul 2025 11:04:40 +0100, Robert Ham wrote:
> On 31/07/2025 09:17, Michał Pecio wrote:
> > Can you mount debugfs and see if you can find the directory below? It
> > would tell if there is anything unusual about those 1 in 65 buffers.
> >
> > /sys/kernel/debug/usb/xhci/0000:00:14.0/
>
> Umm.. and this is with the device connected and snd-usb-audio loaded,
> which might be more helpful :-)
>
> /sys/kernel/debug/usb/xhci/0000:00:14.0/
> /sys/kernel/debug/usb/xhci/0000:00:14.0/ports
> /sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port01
> /sys/kernel/debug/usb/xhci/0000:00:14.0/ports/port01/portsc
> [...]
Actually, the useful stuff would be contents of some of those files,
but the trace you posted later provides similar information. And it
looks like you will need to dig into snd-usb-audio some more.
FYI, scripts/get_maintainer says that the relevant mailing list for
that driver is linux-sound.
Regards,
Michal
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2025-08-02 8:43 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-07-30 20:02 Audio interface causing "xhci_hcd ... WARN: buffer overrun event" messages Bob Ham
2025-07-31 8:17 ` Michał Pecio
2025-07-31 8:27 ` Michał Pecio
2025-07-31 10:11 ` Robert Ham
2025-07-31 14:26 ` Mathias Nyman
2025-08-02 8:43 ` Robert Ham
2025-07-31 9:56 ` Robert Ham
2025-07-31 10:04 ` Robert Ham
2025-07-31 20:21 ` Michał Pecio
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