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[83.28.93.138]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b734fd80a06sm1299820966b.38.2025.11.18.01.59.46 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Tue, 18 Nov 2025 01:59:46 -0800 (PST) Date: Tue, 18 Nov 2025 10:59:29 +0100 From: Michal Pecio To: Forest Cc: Mathias Nyman , Greg Kroah-Hartman , Alan Stern , Heikki Krogerus , Stefan Eichenberger , Pawel Laszczak , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, regressions@lists.linux.dev Subject: Re: [REGRESSION][BISECTED] usb: hub: total system freeze after running adb Message-ID: <20251118105929.330f0042.michal.pecio@gmail.com> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Mon, 17 Nov 2025 12:18:54 -0800, Forest wrote: > #regzbot introduced 8f5b7e2bec1c > > Running adb (android debug bridge) commands causes the entire system to > freeze some time later. > > The freeze usually occurs within two hours of running adb, but not always. > Stopping adb's persistent background process with `adb kill-server` seems to > avoid the freeze. (However, this is not always possible, since the system > sometimes freezes just a few seconds after adb is launched.) > > It occurs even when no android devices are connected to the system. Hi, 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. > - No messages are written to dmesg or syslog. > - Virtual console switching no longer works. > - SysRq key commands no longer work, as far as I can tell. > - Whatever was on the display remains intact. > - Any already-playing audio enters a short loop, as though the > motherboard's sound device is playing from a ring buffer that > no longer gets updated. How can you know nothing is logged if the machine becomes unresponsive? For such occasions I keep a PCIe card with a serial port to get logs. Maybe xHCI debug capability could work too (?), but I've never tried. Regards, Michal