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

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Message-ID: <3e4vhklrg4692n7hbh0pnrlhjkva68mk5v@sonic.net>
Date: Thu, 20 Nov 2025 14:18:00 -0800
From: Forest <forestix@...a.casa>
To: Michal Pecio <michal.pecio@...il.com>
Cc: Mathias Nyman <mathias.nyman@...ux.intel.com>,
        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 Tue, 18 Nov 2025 10:59:29 +0100, Michal Pecio wrote:

>If this is caused by running some demon without much hardware connected
>(besides hubs, I guess), I wonder if it might be useful to run strace on
>that thing to see what it is even doing to trigger this crash.

# strace -p 2862
strace: Process 2862 attached
gettid()                                = 2862
epoll_wait(6,

>How can you know nothing is logged if the machine becomes unresponsive?

By watching the output of `stdbuf -o0 dmesg --follow` when it happens.

Same results in a GUI terminal, a text console, and output redirected to
a `mount -o sync` non-journaled filesystem. I guess it's possible that
something *tried* to log a message, but if so, it didn't get logged.