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[83.28.83.135]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47ff79a72f6sm804608f8f.2.2026.08.05.15.23.39 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Wed, 05 Aug 2026 15:23:39 -0700 (PDT) Date: Thu, 6 Aug 2026 00:23:36 +0200 From: Michal Pecio To: Bart Nagel Cc: linux-usb@vger.kernel.org, mathias.nyman@intel.com Subject: Re: Regression: webcam freezing since Linux 6.15 Message-ID: <20260806002336.6f968841.michal.pecio@gmail.com> In-Reply-To: References: <20260725115956.321185a1.michal.pecio@gmail.com> <20260728003131.085171ee.michal.pecio@gmail.com> <20260730130814.65f7891c.michal.pecio@gmail.com> <20260730235953.2d51e0cc.michal.pecio@gmail.com> <20260805223604.21acaf9b.michal.pecio@gmail.com> Precedence: bulk X-Mailing-List: linux-usb@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 Wed, 5 Aug 2026 14:11:20 -0700, Bart Nagel wrote: > OK. Attached are the first ~700 lines of the trace file. > > That whole thing is 17M, and is here for 48 hours from now in case it > is more illuminating: https://tmpfiles.org/wAwAIQxuuahs/trace.txt It seems that Missed Service Error pointers are about equally likely to be 0x10 or 0x20 after the previous event. And the events are usually Success, Short Packet is less common. Considering that also roughly half of TDs are 0x20 long, we can choose to be optimists and assume that (when it chooses not to report zero), your HC actually reports correct addresses, except for the known narrow problem case of MSE after Short Packet on an early TRB. Or we can choose to be pessimists and say that 0x20 can be bogus too, and then we wrongly skip two TDs instead of one, but three are always missed at a time (for some reason) so no worry, until something will change and suddenly only one TD is missed. Not sure if I have any answer which option is true without another test patch and compilation cycle. Maybe let's be optimistic if it works and no errors are logged, only dynamic debug noise. Regards, Michal