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New: xhci_hcd TRB DMA error and device lockup with AKLOT 2i2 USB audio interface

Bug 219924 [email protected] 1 participant 3 messages Mar 26, 2025 USB

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https://bugzilla.kernel.org/show_bug.cgi?id=219924

Bug ID: 219924
Summary: xhci_hcd TRB DMA error and device lockup with AKLOT
2i2 USB audio interface
Product: Drivers
Version: 2.5
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: USB
Assignee: [email protected]
Reporter: [email protected]
Regression: No

Created attachment 307892
--> https://bugzilla.kernel.org/attachment.cgi?id=307892&action=edit
'dmesg' output while plugging device through a hub, lsusb -t, uname -a and lspci | grep -i usb

My USB audio interface (AKLOT 2i2, Vendor 152a, Product 887e) causes a reproducible failure in the Linux USB subsystem when unplugged during or after audio activity. The issue is severe enough that the xHCI controller refuses to re-enumerate the device until a full reboot (or cold plug with hub reset). My laptop is a Lenovo Slim 7,

In some cases, the AKLOT interface locks up internally, requiring power-cycle or connection to another host to recover.

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#1 lore raw

[Bug 219924] xhci_hcd TRB DMA error and device lockup with AKLOT 2i2 USB audio interface

https://bugzilla.kernel.org/show_bug.cgi?id=219924

Michał Pecio ([email protected]) changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]

--- Comment #1 from Michał Pecio ([email protected]) ---

Quoted 9 lines

[Mar25 21:35] usb 3-5: USB disconnect, device number 7
[ +0.000005] usb 3-5.1: USB disconnect, device number 8
[ +0.001183] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1
[ +0.000006] xhci_hcd 0000:00:14.0: Looking for event-dma 00000000ffa87930 trb-start 00000000ffa87940 trb-end 00000000ffa87940 seg-start 00000000ffa87000 seg-end 00000000ffa87ff0
[ +0.000153] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1

Quoted 8 lines

[ +0.000001] xhci_hcd 0000:00:14.0: Looking for event-dma 00000000ffa87940 trb-start 00000000ffa87950 trb-end 00000000ffa87950 seg-start 00000000ffa87000 seg-end 00000000ffa87ff0
[ +0.000119] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1
[ +0.000002] xhci_hcd 0000:00:14.0: Looking for event-dma 00000000ffa87950 trb-start 00000000ffa87960 trb-end 00000000ffa87960 seg-start 00000000ffa87000 seg-end 00000000ffa87ff0

This looks like we get transfer events normally each microframe but for some reason TDs are consistently dropped from the driver's internal list one step too early. Very bizarre.

Are you able to test a newer kernel like 6.14 or 6.13.x, or at least the 6.12 LTS series? The 6.8 series is frankly no longer supported here, and TBH we can't be sure if it's not a bug unique to Ubuntu 6.8 kernel due to a botched backport of some changes from newer releases.

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#2 lore raw

[Bug 219924] xhci_hcd TRB DMA error and device lockup with AKLOT 2i2 USB audio interface

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=219924

--- Comment #2 from Michał Pecio ([email protected]) --- Either that, or it's possibly related to
https://bugzilla.kernel.org/show_bug.cgi?id=218695

where IIRC some Intel controller was executing (or at least signaling completion of) isochronous OUT transfers twice per transfer after device disconnection.

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