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[2001:1c00:c32:7800:5bfa:a036:83f0:f9ec]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-bd4f4bd2f5csm187895966b.3.2026.05.15.00.43.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 15 May 2026 00:43:30 -0700 (PDT) Message-ID: <7ba6b4ee-fd2a-470e-951c-2c69961b977a@oss.qualcomm.com> Date: Fri, 15 May 2026 09:43:30 +0200 Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: johannes.goede@oss.qualcomm.com Subject: Re: Linux 7.1-rc3 regression (Bluetooth) To: Greg KH , 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 References: <01ffb0cc-dcf6-4e60-adf3-fbb96e0666d0@leemhuis.info> <51b55b97-615b-4f5e-b454-df646f4058b7@augustwikerfors.se> <2026051514-scorch-ecologist-5e7e@gregkh> Content-Language: en-US, nl In-Reply-To: <2026051514-scorch-ecologist-5e7e@gregkh> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=D7Z37PRj c=1 sm=1 tr=0 ts=6a06cea4 cx=c_pps a=KB4UBwrhAZV1kjiGHFQexw==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=VwQbUJbxAAAA:8 a=pGLkceISAAAA:8 a=x5eH5QKNjoUSqzY6eP8A:9 a=QEXdDO2ut3YA:10 a=o1xkdb1NAhiiM49bd1HK:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTE1MDA3NiBTYWx0ZWRfX/bgcuG+ESvRO Gw+KAyhxcrQ+Mg97EaDQM5x2GMFfh+1mFGhdSWnqIx60Pg4F3d02zHVR4F1F0BhALjFA2QLOHUS K4DtZKrW6kXrovXAsu5UWKguurmiiXJZ50hwlAkldwD7XPgjOQUUhe4vz2xBh7r7TP1x8h+Z81Y QRQfRQo0py/7+5FpnsU7MVjSz9StqMR7TLedcFP4jS4GYXKRPdZYCXTqw6T7AkpHZtB+5yM5vtc YY8SUWV2PZXjP6caGvxXe3HID0Jm3nTTz8kNuh73Z5kj6kOJJi06N4Sk0zz0KyACImWKWaTKz7r UlqnXCSlkuZTuDouHaFyYJIysJteM53wB9/Ocuc6IS+hLW7mkHfqyLpI+Z/pBuOByjzzAghs2tW SNVTytyCfYxjZSuvvHUPttEG9FHN52oJbmYVgT8kMn6cgFAiRqwQ0ahZOS8eye5u+dchB4iTc8R E6mpExrx8ZdVKKOwchg== X-Proofpoint-ORIG-GUID: WRVITitxZpHUfTD3qwRS4z-dHCUsa-Qw X-Proofpoint-GUID: WRVITitxZpHUfTD3qwRS4z-dHCUsa-Qw X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-15_01,2026-05-13_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 impostorscore=0 adultscore=0 phishscore=0 clxscore=1011 bulkscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605150076 Hi, On 15-May-26 07:37, Greg KH wrote: > 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! That relies on someone actively intervening in the process though, I wonder if it would be an idea to have some CI which checks patches in stable RC releases vs regzbot tracking? This assumes tegzbot tracking includes the mainline git hash of commits causing the regression (if/once known). Regards, Hans