linux-kernel - Re: [REGRESSION][BISECTED] usb: hub: total system freeze after running adb

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Message-ID: <7a6dfc17-12cc-4972-88d8-acf86e4fca45@linux.intel.com>
Date: Fri, 5 Dec 2025 16:57:45 +0200
From: Mathias Nyman <mathias.nyman@...ux.intel.com>
To: Forest <forestix@...a.casa>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Alan Stern <stern@...land.harvard.edu>,
 Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
 Stefan Eichenberger <stefan.eichenberger@...adex.com>,
 Pawel Laszczak <pawell@...ence.com>, linux-usb@...r.kernel.org,
 linux-kernel@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: [REGRESSION][BISECTED] usb: hub: total system freeze after
 running adb

On 12/5/25 03:56, Forest wrote:
> On Thu, 4 Dec 2025 01:41:37 +0200, Mathias Nyman wrote:
> 
>> If possible, could you try with the same usb debugging enabled as last time,
>> and add HUNG_TASK debugging entries in kernel config:
>>
>> CONFIG_DETECT_HUNG_TASK=y
>> CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=30
>> CONFIG_DETECT_HUNG_TASK_BLOCKER=y
>>
>> And add the following patch to hub driver:
> 
> That patch failed to apply, due to tab/space differences. I guess Thunderbird
> might have taken liberties when you sent it. It was easy enough to make those
> edits by hand, though.
> 
> The result was again bursts of dmesg output roughly once per second, this time
> 107 lines each. I compared the last three bursts that made it to my redirected
> output file, and they were again the same except for timestamps and a few lines
> being reordered.
> 
> A screen photo once again shows newer timestamps than the file. I did not
> read every line in the photo to compare it with the log file, but the last
> dozen lines look the same. I suppose I can send you the photo if you like.
> 

Yes please, small differences, ordering, and timing matter in this case

Thanks
Mathias