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Tue, 18 Nov 2025 06:44:49 +0000 (GMT) Message-ID: Date: Tue, 18 Nov 2025 12:14:48 +0530 Precedence: bulk X-Mailing-List: linux-next@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [linux-next20251118] BUG: Kernel NULL pointer dereference To: Venkat Rao Bagalkote References: <5ef3eb20-d1db-41d0-83cf-4a78439e4a3c@linux.ibm.com> Content-Language: en-US From: Shrikanth Hegde Cc: LKML , Linux Next Mailing List , Madhavan Srinivasan , Stephen Rothwell , Ingo Molnar In-Reply-To: <5ef3eb20-d1db-41d0-83cf-4a78439e4a3c@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: zeqmLfOB9fiwk1QrTzaGmS8zCpyfUJI6 X-Proofpoint-ORIG-GUID: zeqmLfOB9fiwk1QrTzaGmS8zCpyfUJI6 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTE1MDAzMiBTYWx0ZWRfXwXyyz/PVJg5Q aLzAG0lP1jH/YspVNO07j3lbmUMr1vBzbq1d3KTmuBc1mVSKMvcuOxjzEpepHu76L2kB84Y0DrL +mzNrePYOOYGWFQ0yEISOCgud72UBfMMruub28RfOIb2/xBbHRnTDhamCRlzVVqvIF/bn0lKzzF IMKjNXb1Nj4CMEOytYnCt90WNDru3Z0+e9hJEozcONfdvSP8Lgm4SqvEcdHLevI3NhijfWErpE5 kbDMQJGDE5oGNbPdITngOjgPwJfDuFowHRhO+8EdLa4qV+n57lqExF2AG+TMKwp+A5Fti5Jk8RU fwuQywF0m8F7Pf9BPtXLhYLLmc23oytSA2bxWsHHK8f/PBXuiID8Ygb5z1EGnc0sLBd4mRG+PuT WhKWxg7+kKPJjc6qH91lZQboP03R+Q== X-Authority-Analysis: v=2.4 cv=SvOdKfO0 c=1 sm=1 tr=0 ts=691c15e7 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=bb4p-YTHEgrGTQ8LCFsA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-17_04,2025-11-13_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 clxscore=1011 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 impostorscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2511150032 On 11/18/25 12:10 PM, Venkat Rao Bagalkote wrote: > Greetings!! > > > IBM CI has reported a boot crash while booting with linux-next2025118 > kernel. > > > Traces: > > > [    0.116026] audit: type=2000 audit(1763602256.110:1): > state=initialized audit_enabled=0 res=1 > [    0.116282] thermal_sys: Registered thermal governor 'fair_share' > [    0.116284] thermal_sys: Registered thermal governor 'step_wise' > [    0.120228] BUG: Kernel NULL pointer dereference at 0x00000000 > [    0.120236] Faulting instruction address: 0xc0000000002b08a4 > [    0.120241] Oops: Kernel access of bad area, sig: 11 [#3] > [    0.120245] LE PAGE_SIZE=64K MMU=Hash  SMP NR_CPUS=8192 NUMA pSeries > [    0.120252] Modules linked in: > [    0.120257] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G   D >  6.18.0-rc6-next-20251118 #1 VOLUNTARY > [    0.120265] Tainted: [D]=DIE > [    0.120268] Hardware name: IBM,8375-42A POWER9 (architected) 0x4e0202 > 0xf000005 of:IBM,FW950.80 (VL950_131) hv:phyp pSeries > [    0.120273] NIP:  c0000000002b08a4 LR: c0000000002b04a4 CTR: > 0000000000000000 > [    0.120278] REGS: c0000009fffffaa0 TRAP: 0380   Tainted: G D > (6.18.0-rc6-next-20251118) > [    0.120284] MSR:  8000000000009033   CR: > 48002828  XER: 20040006 > [    0.120296] CFAR: c0000000002b04bc IRQMASK: 0 > [    0.120296] GPR00: c0000000002b04a4 c0000009fffffd40 c000000001e58100 > 0000000000000001 > [    0.120296] GPR04: c000000002d68100 0000000000000007 0000000000000000 > 0000000000000001 > [    0.120296] GPR08: c000000005331e78 0000000000000400 c000000002d68100 > 0000000000000000 > [    0.120296] GPR12: 0000000000000000 c000000002f90000 0000000000000000 > c0000009fffffe94 > [    0.120296] GPR16: 0000000000000000 c000000002cadb00 0000000000000000 > c000000003675e00 > [    0.120296] GPR20: 0000000000000000 0000000000000000 0000000000000001 > 00000000ffff8add > [    0.120296] GPR24: 0000000000000001 c00000000cacaa00 c000000002c72b00 > 0000000000000000 > [    0.120296] GPR28: c0000009fffffdb8 0000000000000000 c0000009e941b800 > c0000009e941b800 > [    0.120353] NIP [c0000000002b08a4] sched_balance_rq+0x504/0x8b0 > [    0.120361] LR [c0000000002b04a4] sched_balance_rq+0x104/0x8b0 This should be fixed by this. https://lore.kernel.org/lkml/176339661932.498.15491008222212450109.tip-bot2@tip-bot2/ Can you rebase tip/sched/core to latest and try?