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Mon, 02 Mar 2026 02:19:11 -0800 (PST) X-Received: by 2002:a17:902:f708:b0:2ae:4847:cace with SMTP id d9443c01a7336-2ae4847cc94mr51830795ad.28.1772446751504; Mon, 02 Mar 2026 02:19:11 -0800 (PST) Received: from hu-kshaikkh-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2adfb5b53f4sm131326715ad.18.2026.03.02.02.19.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Mar 2026 02:19:11 -0800 (PST) From: Khaja Hussain Shaik Khaji To: mark.rutland@arm.com Subject: Re: [PATCH v2 1/2] arm64: kprobes: disable preemption across XOL single-step Date: Mon, 2 Mar 2026 15:49:05 +0530 Message-Id: <20260302101905.3591689-1-khaja.khaji@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: a9DEOCpRsfB4Y6bdkDm3lPtY4y8nGC40 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzAyMDA4NSBTYWx0ZWRfX9tFguwRmML2C Bx3hMIdOwwYPrjU0Yo7/6a92XaN6k6BvNEn7xmL7kipMhF0LO7plq5CHjWzGKycOXNYvZyKYMJG 5IPwRKbQ4ujcDf3jhrRlmCSrYa/YCe7AqAF1iQrMXOvdFzZOXADqOX9lq1NfJXFhGKXlSm3WJoA pyG2wzRtlfWrjtXRxAek60nvnmDoD0YgpPCbB9TFRqW6+HIfwIa5N9TlbbEh6rY/duZb0mNz8tK nNRvjS2rxc9P5Bxl7VTv7C6VjIczgN/WRPpboJxXjq/F3zC2JXN9G98CScdYtC8DREfdyVXvjsX s9REKzsQ+uJrrG2Kqs8Xi+4dFTWIdJ/ZqtKfo9TW9PzmIuPFPGnAjqZOjXaXsY4auYGFXmUtAii e6zaR/pl07oO/1JawGYCnpPxpP8st7GbwDur37u1WlSb43fLsGIgrxhQufciopejI3vupgj1qxu FLto0paeUAU6eE5TBhw== X-Proofpoint-ORIG-GUID: a9DEOCpRsfB4Y6bdkDm3lPtY4y8nGC40 X-Authority-Analysis: v=2.4 cv=I5Vohdgg c=1 sm=1 tr=0 ts=69a56420 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=Ioe3sshWH7rKnnzZdWAA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-02_02,2026-02-27_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1011 phishscore=0 impostorscore=0 bulkscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603020085 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260302_021913_796054_B15E0E88 X-CRM114-Status: GOOD ( 14.80 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-msm@vger.kernel.org, dev.jain@arm.com, linux-kernel@vger.kernel.org, mhiramat@kernel.org, catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, yang@os.amperecomputing.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Feb 17, 2026 at 04:55:44PM +0000, Mark Rutland wrote: > Since DAIF is masked, we won't take an IRQ to preempt during XOL. > Can you please share an example failure that you have seen? > I believe other architectures are likely affected by the same problem. Thank you for the review. You were correct on all counts. I confirmed the issue is not related to scheduling or preemption, and the v1/v2 approach was based on an incorrect assumption. I’m dropping that line of reasoning. I’ve since identified the actual root cause and have a new fix ready, which I’ll send shortly as v3. Thanks, Khaja