linux-kernel - Re: xhci: WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state.

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Message-ID: <84b400f8-2943-44e0-8803-f3aac3b670af@molgen.mpg.de>
Date: Sat, 5 Apr 2025 07:23:12 +0200
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc: Mathias Nyman <mathias.nyman@...el.com>,
 Michal Pecio <michal.pecio@...il.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, linux-usb@...r.kernel.org,
 LKML <linux-kernel@...r.kernel.org>
Subject: Re: xhci: WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep
 state.

Dear Mathias,

Am 04.04.25 um 16:26 schrieb Mathias Nyman:
> On 3.4.2025 21.02, Paul Menzel wrote:

>> Just a heads-up, that connecting an LMP USB-C mini Dock [1] to the 
>> Intel Kaby Lake Dell XPS 13 9360 with
>>
>>      00:14.0 USB controller [0c03]: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller [8086:9d2f] (rev 21)
>>
>> resulted in Linux 6.14.0-12966-ga2cc6ff5ec8f logging the warning and 
>> trace below.
>>
>> ```
>> [   74.898485] usb 4-1.4: reset SuperSpeed USB device number 5 using xhci_hcd
>> [   74.916241] sd 0:0:0:0: [sda] Media removed, stopped polling
>> [   74.916634] sd 0:0:0:0: [sda] Attached SCSI removable disk
>> [   98.803081] PM: suspend entry (deep)
>> [   98.813999] Filesystems sync: 0.010 seconds
>> [   98.819226] Freezing user space processes
>> [  105.534176] xhci_hcd 0000:39:00.0: WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state.
>> [  105.606437] usb 4-1.4: reset SuperSpeed USB device number 5 using xhci_hcd
>> [  118.822270] Freezing user space processes failed after 20.003 seconds (2 tasks refusing to freeze, wq_busy=0):
> 
> Thanks for the report.
> 
> Looks like it's triggered during system suspend.
> 
> "The Set TR Deq" command that fails here is queued when
> - endpoint stops to remove cancelled transfers.
> - endpoint resets to clear STALL or other halt due to transfer error.
> - canceling a transfer while endpoint is mid stall or tt clearing.
> 
> Looks like there are at least some gaps in verifying endpoint state in 
> endpoint reset handler  before queuing the "Set TR Deq" command, this
> could be a possible reason.
> 
> If this case could be reproduces with xhci dynamic debug enabled it 
> would help narrowing down the real cause.
> 
> echo 'module xhci_hcd =p' >/sys/kernel/debug/dynamic_debug/control

I hit the problem again without ACPI S3 suspend/resume involved. Please 
find the log messages attached.

Kind regards,

Paul

PS: As it’s happening so often, it feels to me like a regression.
View attachment "20250405--dell-xps-13-9360--linux-6.14.0-13381-g4a1d8ababde6--messages.txt" of type "text/plain" (116414 bytes)