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Thu, 28 May 2026 16:01:22 +0000 (GMT) Received: from linux.ibm.com (unknown [9.126.150.29]) by smtpav04.fra02v.mail.ibm.com (Postfix) with SMTP; Thu, 28 May 2026 16:01:22 +0000 (GMT) Date: Thu, 28 May 2026 21:31:21 +0530 From: Srikar Dronamraju To: Shrikanth Hegde Cc: Venkat Rao Bagalkote , Madhavan Srinivasan , Ritesh Harjani , "Christophe Leroy (CS GROUP)" , LKML , linuxppc-dev , linux-sched@vger.kernel.org, tim.c.chen@linux.intel.com, K Prateek Nayak , Peter Zijlstra , "Chen, Yu C" Subject: Re: [BUG] sched/cache: "Make LLC id continuous" causes NULL cpumask dereference in build_sched_domains on POWER9 Message-ID: Reply-To: Srikar Dronamraju References: <51154de7-3700-4cb4-82f2-1b3a8fa427f7@linux.ibm.com> <8675afde-5c7f-4717-be7a-a473bd1af381@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=iso-8859-1 Content-Disposition: inline In-Reply-To: X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTI4MDE1OCBTYWx0ZWRfX4korwaZaue1t 2eiT8yF1fyxNgq4nO2AupK3SCWPUQC1FpnNWoI99sVPpmHcw3bKQnGxzmOfY41mis7TWX2jUI0n DoY2ezOLYFhuqa9lzjBsopmLoayKqoM+OLrwNTAhcAqnunnsP+pH/svqmNYFB3ZpVBlaXWq0AxB 7oVPiPX9DTQ6BKSkhOIsnSz4zOLElvsys4kVsq4h097is9eftrVlrqljBQUUhsh2MijW4vyCBhl LTzm41pXS1QC9Mf1xqRBR+Lik5poIn4OuGlPBbvtlAgoiAzRCvvI9tqSm771C/QEH2vkpEvgm9V JloEFZR2QPhAcKMd9/Wbc5m9XMuYruSHhSkDY6bY3PljNf1dh1U59uSn3PPgY3Pk7gHq/oZJMOH ++urzHESVwXiIHfZ5wCCG8bhSWgGQ03PSnx5Bc7kHIU1M+tjgbQiVovFO1meA+HpJsnf6ODddCE /Enw/asUhxuuGYDEIkw== X-Proofpoint-ORIG-GUID: bAmFYiY2BSOdJpW932MLCGeXnyHgt9LI X-Authority-Analysis: v=2.4 cv=IJEyzAvG c=1 sm=1 tr=0 ts=6a1866d9 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=8nJEP1OIZ-IA:10 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=QyXUC8HyAAAA:8 a=F3R1hv1vQv_lyvgeWPUA:9 a=wPNLvfGTeEIA:10 X-Proofpoint-GUID: bAmFYiY2BSOdJpW932MLCGeXnyHgt9LI X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-05-28_04,2026-05-28_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 clxscore=1015 spamscore=0 bulkscore=0 adultscore=0 priorityscore=1501 malwarescore=0 lowpriorityscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2605280158 * Shrikanth Hegde [2026-05-27 12:35:20]: > On 5/26/26 10:54 AM, Venkat Rao Bagalkote wrote: > > > > On 26/05/26 9:38 am, Chen, Yu C wrote: > > > Hi Venkat, > > > > > > On 5/26/2026 11:14 AM, Srikar Dronamraju wrote: > > > > * Chen, Yu C [2026-05-25 23:35:45]: > > > > > > > > > Hi Venkat, > > > > > > > > > > On 5/25/2026 10:07 PM, Venkat Rao Bagalkote wrote: > > > > > > Greetings!!! > > > > > > > > > > > > I am seeing an early boot kernel panic due to NULL pointer dereference > > > > > > on a POWER9 (pSeries) system when testing linux-next (next-20260522). > > > > > > This issue is seen on P11 as well. > > > > > > Regards, > > > > Venkat. > > > > Venkat, > > Was it on P11 on Shared LPAR? I also thought the same. But I checked with Venkat, he said it was on a dedicated LPAR. My multiple tries on dedicated, didnt reproduce the problem. -- Thanks and Regards Srikar Dronamraju