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Wed, 9 Sep 2026 06:18:45 +0000 (GMT) From: Madhavan Srinivasan To: tglx@kernel.org, linuxppc-dev@lists.ozlabs.org, Shrikanth Hegde Cc: linux-kernel@vger.kernel.org, chleroy@kernel.org, sbhat@linux.ibm.com, mkchauras@gmail.com Subject: Re: [PATCH] powerpc/entry: Clear TIF_SYSCALL_RET before syscall error return Date: Wed, 9 Sep 2026 11:48:44 +0530 Message-ID: <178893459265.174069.668944164131216470.b4-ty@linux.ibm.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260828053811.1042300-1-sshegde@linux.ibm.com> References: <20260828053811.1042300-1-sshegde@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: kz8mRDqjBfajbfMiQ6eLi9JWtdOfD2hE X-Proofpoint-GUID: 3oWRKh6B2tyboJhspHQJq2t7ZIj2PEd2 X-Authority-Analysis: v=2.4 cv=DbEnbPtW c=1 sm=1 tr=0 ts=6aa0fa4d cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VwQbUJbxAAAA:8 a=dd1Y5fJFrbZObAHnrb4A:9 a=QEXdDO2ut3YA:10 a=zgiPjhLxNE0A:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA5MDA2NiBTYWx0ZWRfX5GyiWoD2S/uy JkhWhOnCJwux9r+cDUOe9hk4RJ+zZeQV16lNy0xWBeRp+a5ImJkQdkQMH7BMcOPj4xdu5c5ceZA MIFHhmiwig+pSeYtTP5J/s5KN+jM9FjxH2cxR2uK7uMJgnNmL2qQXXl2c0YmMR7SKDEOnAzl/Sf GyjG0/CP04K49HpNKPnU2ymhYodOVJYSGSTFnJ+jQRcLDQoIG+c8T3Rw5X4UbO92QdaMm5wDGnW rwRBy4S/rtaGGay1Kzue2Q1DsOGaPSnjJ3XUvzT56rdTPsEtxfNPtT1wtfCycnaRPoJTVnWNklq USYOkZChk08+hcG5j+4q4e6xsQZSOD34GqDpC8KTCkliXqB7lPb0R4qiZ0tcW6nzxg74I7zxMmr L8rm7jpsIyfou1Lxb7/l4IRoxkUwZIcYY3l2554Yk4BVx3TsAXrhwwotbuYT7jdXupXiMCJ5lpx Jt2Lk8x2pORRBRwo2cw== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA5MDA2NiBTYWx0ZWRfX6SdhN1IayLTs zRfcGAAm6qZ379427m3WPltwgz0rsy1bMmiyU8k6C/dGV/tRUn+6P3Xgilo1R9vu2o25Zjx//G9 dKDSM5W3jfrosWavJ8AMRk6EmO1leec= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-08_03,2026-09-08_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 priorityscore=1501 impostorscore=0 adultscore=0 spamscore=0 clxscore=1011 suspectscore=0 bulkscore=0 malwarescore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609090066 On Fri, 28 Aug 2026 11:08:11 +0530, Shrikanth Hegde wrote: > Shivaprasad reported a boot failure due to userspace processes crash on > abort() from libc.so.6. It was bisected to merge request > commit '3424d8c18a7d ("Merge tag 'core-entry-2026-08-17' of > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip")' > > Upon checking the merge, when syscall_enter_from_user_mode_randomize_stack > fails, which could happen when a tracer like seccomp or ptrace intercepts > and skips the syscall, the code returns to userspace immediately without > clearing the intermediate flag which was set. > > [...] Applied to powerpc/fixes. [1/1] powerpc/entry: Clear TIF_SYSCALL_RET before syscall error return https://git.kernel.org/powerpc/c/2c1dde8a69a3a7d64425a6de0add6e289a5a402f cheers