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Fri, 15 May 2026 01:37:42 -0400 (EDT) Date: Fri, 15 May 2026 07:37:47 +0200 From: Greg KH To: August Wikerfors Cc: Thorsten Leemhuis , linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org, Linux kernel regressions list , stable@vger.kernel.org, Luiz Augusto von Dentz , Pauli Virtanen , Mikhail Gavrilov , markus.suvanto@gmail.com Subject: Re: Linux 7.1-rc3 regression (Bluetooth) Message-ID: <2026051514-scorch-ecologist-5e7e@gregkh> References: <01ffb0cc-dcf6-4e60-adf3-fbb96e0666d0@leemhuis.info> <51b55b97-615b-4f5e-b454-df646f4058b7@augustwikerfors.se> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <51b55b97-615b-4f5e-b454-df646f4058b7@augustwikerfors.se> On Fri, May 15, 2026 at 04:26:38AM +0200, August Wikerfors wrote: > On 2026-05-11 08:30, Thorsten Leemhuis wrote: > > On 5/11/26 07:17, markus.suvanto@gmail.com wrote: > > > Hello > > > > > > I upgrade 7.1-rc2 to 7.1-rc3. After that bluetooth didn't start > > > hci0: Failed to send wmt func ctrl (-22) > > > My fix was to revert commit 634a4408c0615c523cf7531790f4f14a422b9206 > > > > Thx for your report. FWIW, there are two proposed fixed for this change > > floating around: > > > > https://lore.kernel.org/all/20260508173121.27526-1-mikhail.v.gavrilov@gmail.com/ > > https://lore.kernel.org/all/770d36b07311bf88210c187923f243fb9f126f04.1777058551.git.pav@iki.fi/ > > > > Given that this is the third revert within a short time-frame I wonder > > if we should fast-track a fix (once ready) to spare more users the pain > > of bisecting & reporting. > > FYI the commit that caused this regression was backported to the latest > stable releases (6.12.88, 6.18.30 and 7.0.7). I encountered it after > updating to 7.0.7 and can confirm that the patch from the second link > fixes it. That patch is now in the bluetooth tree as e3ac0d9f1a20 > ("Bluetooth: btmtk: accept too short WMT FUNC_CTRL events") and a pull > request [1] has been made to the net tree. Unfortunately this seems to > have been a few hours too late to make it into the net pull request for > 7.1-rc4 [2], so the fix might not get into mainline until next week. > > As a side note, it is unfortunate that there does not seem to be a > process to prevent patches that are known to cause regressions from > being backported to stable releases. As far as I can tell, this was > added to regzbot tracking [3] a day before the culprit was queued for > stable [4], so such a process could have prevented this regression in > stable releases. You can email stable@vger to let us know to drop a patch, or when the -rcs are released, respond to the offending patch in that list. THat's why we have -rc releases! thanks, greg k-h