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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-233ff290d45sm39416345ad.153.2025.05.25.17.40.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 25 May 2025 17:40:49 -0700 (PDT) Message-ID: <2f010e28-121e-4e60-bf48-5ee5bcd0cbea@oss.qualcomm.com> Date: Mon, 26 May 2025 08:40:46 +0800 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: [PATCH] arm64: dts: qcom: qcs615: fix a crash issue caused by infinite loop for Coresight To: Konrad Dybcio , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Suzuki K Poulose , Mike Leach , James Clark Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250522005016.2148-1-jie.gan@oss.qualcomm.com> <757925b7-3795-409a-9419-b33767c49e2e@oss.qualcomm.com> Content-Language: en-US From: Jie Gan In-Reply-To: <757925b7-3795-409a-9419-b33767c49e2e@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: lu5MKOiPlyS5oqyswE-QH1BHHhN6DYue X-Authority-Analysis: v=2.4 cv=E9nNpbdl c=1 sm=1 tr=0 ts=6833b894 cx=c_pps a=MTSHoo12Qbhz2p7MsH1ifg==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=dt9VzEwgFbYA:10 a=EUspDBNiAAAA:8 a=xnzTxB3kx4SK0ZEB8yoA:9 a=QEXdDO2ut3YA:10 a=GvdueXVYPmCkWapjIL-Q:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTI2MDAwMyBTYWx0ZWRfX497jtu7V0XJT C8+yRzdSwnHiMDMx9eKN2pzAwHs+jDCsLhlfF4rtxZqcwwfZoRcyrXI5UoDIbcQG53Qnrrec+hF 0vqw9kFbzqyNYdkdBvMzVX8PYRI9xaSIPtPdijSVsajhOMhwwZOc34ceESSzP47tgut6IFb2F2L wZndJ/VN3jXlpsIRy3CZE324VpbjbdCdTUwQl5rznXhjtTCcE2qEhEximm9bKwuiiq8dy+A3Hgm wFYwDTFt7h2DGcheXQQ3syDcnIHbiq33eQegPr2lgdA3UkRCawrdUotw8TWXHVPSN65EPsoigVR Sc2hVQA717bsngZmXwWWrDf+BFW0EYX7cr0mJ0W/MkT4UM637A9L9m05rONCFotospPKXj3w/fk GPTUQ3Bq42BW3LaTS5pgKMfmv5tQvKLVgIRLsWhXTmdZziQBW/13xI1tw9SKO7MQEXEWxjEU X-Proofpoint-ORIG-GUID: lu5MKOiPlyS5oqyswE-QH1BHHhN6DYue X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-05-26_01,2025-05-22_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=999 spamscore=0 malwarescore=0 priorityscore=1501 adultscore=0 phishscore=0 impostorscore=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 bulkscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505160000 definitions=main-2505260003 On 5/22/2025 11:06 PM, Konrad Dybcio wrote: > On 5/22/25 2:50 AM, Jie Gan wrote: >> An infinite loop has been created by the Coresight devices. When only a >> source device is enabled, the coresight_find_activated_sysfs_sink function >> is recursively invoked in an attempt to locate an active sink device, >> ultimately leading to a stack overflow and system crash. Therefore, disable >> the replicator1 to break the infinite loop and prevent a potential stack >> overflow. > > Is it something we can fix the driver not to do instead? > As Suzuki mentioned in other mail thread, it is very difficult to observe the scenario that there is a loop in the path by current driver. I tried fix the issue in driver before send this DT fix patch. I will continue to seek an option of fixing in driver. Thanks, Jie > Konrad > >> >> replicator1_out -> funnel_swao_in6 -> tmc_etf_swao_in -> tmc_etf_swao_out >> | | >> replicator1_in replicator_swao_in >> | | >> replicator0_out1 replicator_swao_out0 >> | | >> replicator0_in funnel_in1_in3 >> | | >> tmc_etf_out <- tmc_etf_in <- funnel_merg_out <- funnel_merg_in1 <- funnel_in1_out >> >> [call trace] >> dump_backtrace+0x9c/0x128 >> show_stack+0x20/0x38 >> dump_stack_lvl+0x48/0x60 >> dump_stack+0x18/0x28 >> panic+0x340/0x3b0 >> nmi_panic+0x94/0xa0 >> panic_bad_stack+0x114/0x138 >> handle_bad_stack+0x34/0xb8 >> __bad_stack+0x78/0x80 >> coresight_find_activated_sysfs_sink+0x28/0xa0 [coresight] >> coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight] >> coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight] >> coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight] >> coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight] >> ... >> coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight] >> coresight_enable_sysfs+0x80/0x2a0 [coresight] >> >> side effect after the change: >> Only trace data originating from AOSS can reach the ETF_SWAO and EUD sinks. >> >> Fixes: bf469630552a ("arm64: dts: qcom: qcs615: Add coresight nodes") >> Signed-off-by: Jie Gan >> --- >> arch/arm64/boot/dts/qcom/qcs615.dtsi | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/arch/arm64/boot/dts/qcom/qcs615.dtsi b/arch/arm64/boot/dts/qcom/qcs615.dtsi >> index f08ba09772f3..b67c1f8a1118 100644 >> --- a/arch/arm64/boot/dts/qcom/qcs615.dtsi >> +++ b/arch/arm64/boot/dts/qcom/qcs615.dtsi >> @@ -1902,6 +1902,7 @@ replicator@604a000 { >> >> clocks = <&aoss_qmp>; >> clock-names = "apb_pclk"; >> + status = "disabled"; >> >> in-ports { >> port {