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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-bc21478931dsm90603166b.24.2026.05.04.00.49.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 04 May 2026 00:49:55 -0700 (PDT) Message-ID: Date: Mon, 4 May 2026 09:49:53 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [7.1-rc1 BUG] System hang when reading clock controller sysfs 'registers' files To: Daniel J Blueman , Dmitry Baryshkov , Jagadeesh Kona , Taniya Das , Abel Vesa , Imran Shaik , Vladimir Zapolskiy Cc: Linux Kernel , linux-arm-msm@vger.kernel.org, Bjorn Andersson References: Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: -TTeJsz5_keSxEYVhSK-8pHIAqzGd0kp X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA0MDA4MyBTYWx0ZWRfX4KuHV9Cv56JW Vj+qWvS0uZstVBVhP+gGZ+kWlrZ/L0cUCP5fVYMHrAUxDLc/sy7RG3ipLQy8eRPBlKuO229kuR8 ZanE53uEB333Fr2Kd1Z6gnRnMJKdBHMQlENb1+HNmV0GRnPHDYvx2Z64REVtnLGB5/iPwhM+pt+ gxXhNjSX78M6RWpYUySdxNuDYcMFHuadu9WxQNTWMis5zXrZ9jZcqeSL6MUHsOOeVCnemj/q62l ZJGU8I7B0pTNFoJnyPpNRERUPAxdgHsdLv4NxgqLqhdatLQSlFBkTggAE59XRokZL+nvllR0fWa fYc+3hfjlPGgjP2MUK6QAevnmPpYH8jALg+Z0BE+Kbp5cWRCryvTrk5NHBTnseX0//iAbs6us1x mkxJ1hxJEg7cCEh973NE8R7yUH0X44Vy3ep2HE2im2DsVtEqLmtxSRZmjxRjZiLRJy95y/P+wRG Os4eTVFY6eAn1ENLunw== X-Authority-Analysis: v=2.4 cv=dqLrzVg4 c=1 sm=1 tr=0 ts=69f84fa5 cx=c_pps a=wuOIiItHwq1biOnFUQQHKA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=la654yHik8Jaich8hRMA:9 a=QEXdDO2ut3YA:10 a=XD7yVLdPMpWraOa8Un9W:22 X-Proofpoint-ORIG-GUID: -TTeJsz5_keSxEYVhSK-8pHIAqzGd0kp 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=2026-05-04_03,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 clxscore=1015 suspectscore=0 spamscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 adultscore=0 impostorscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605040083 On 5/2/26 8:40 AM, Daniel J Blueman wrote: > On a Qualcomm X1 Hamoa-based Lenovo Slim7x with upstream 7.1-rc1, when > reading any of the /sys/kernel/debug/regmap/*clock*/registers files > [1] (which could happen inadvertently with grep), we see a complete > and immediate system hang. > > If this relates to clock/power gating, it could be avoided by > inhibiting that prior to the read. It also reproduces when booted with > "clk_ignore_unused pd_ignore_unused". Does this attempt to read the entire regmap-ped address space of the device? If so, that's probably ""intended"", since there are TZ-only (and other forms of secure) registers sprinkled throughout the range Konrad > > Thanks, > Dan > > -- [1] > > /sys/kernel/debug/regmap/100000.clock-controller/registers > /sys/kernel/debug/regmap/1fc0000.clock-controller/registers > /sys/kernel/debug/regmap/3d90000.clock-controller/registers > /sys/kernel/debug/regmap/6b6c000.clock-controller-lpass-audio-csr/registers > /sys/kernel/debug/regmap/6ea0000.clock-controller-lpass-tcsr/registers > /sys/kernel/debug/regmap/aaf0000.clock-controller/registers > /sys/kernel/debug/regmap/af00000.clock-controller/registers > /sys/kernel/debug/regmap/dummy-clock-controller@0x0000000001fc0000/registers > -- > Daniel J Blueman