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Tue, 18 Nov 2025 06:40:09 +0000 (GMT) Message-ID: <5ef3eb20-d1db-41d0-83cf-4a78439e4a3c@linux.ibm.com> Date: Tue, 18 Nov 2025 12:10:07 +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 Content-Language: en-GB To: LKML , Linux Next Mailing List , Madhavan Srinivasan , Stephen Rothwell , Ingo Molnar , Shrikanth Hegde From: Venkat Rao Bagalkote Subject: [linux-next20251118] BUG: Kernel NULL pointer dereference Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: gigNVgdsrhRWfJHKnCYP1lmyKx1WPT9d X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTE1MDAzMiBTYWx0ZWRfX5jxGJyEghP0n JTKrQJBkFV8+3tX5bXTt/+46ToUGj8zNSKQicZkiNczUedY2EcO3iOAFlYc8hys6srcvY0ySqOv B3ZLddv64SxfJSrCjjg87qKmo7CLfawFYkCqTb9FFezT5pxM8GcTumepcblSv4MB52Tkrofn0wc rSQSrxw/O51HgjIQZzG51BaPnQvHvf3boxuYyKjGPKRSKG7LBQLyH0f+pyXsnerj79eKbr8m3Xi sRxC0O2HcICqkIW6G4pJPYev1f2wni9RlYqkiPj+tldhVf709cSc9FClksdJ3XgKccXO5LlRW6N I7dQTXdtr+/QPixOdJuAP5k0D6UKQaTa73sJJGyYZkjlgf8PN7r58gAW+K8iM2tCFLX9Qy5Bfjr g/UDHWgltXwoEtxD7qamdrxls55jVg== X-Proofpoint-ORIG-GUID: gigNVgdsrhRWfJHKnCYP1lmyKx1WPT9d X-Authority-Analysis: v=2.4 cv=XtL3+FF9 c=1 sm=1 tr=0 ts=691c14cf cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=r7MKod_UI1lkIC2NXqAA: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 clxscore=1015 spamscore=0 bulkscore=0 priorityscore=1501 impostorscore=0 adultscore=0 lowpriorityscore=0 phishscore=0 suspectscore=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 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 [    0.120367] Call Trace: [    0.120370] [c0000009fffffd40] [c0000000002b04a4] sched_balance_rq+0x104/0x8b0 (unreliable) [    0.120379] [c0000009fffffe60] [c0000000002b1928] sched_balance_domains+0x298/0x3f0 [    0.120386] [c0000009ffffff00] [c00000000023d8d8] handle_softirqs+0x138/0x400 [    0.120394] [c0000009ffffffe0] [c000000000017da8] do_softirq_own_stack+0x38/0x50 [    0.120402] [c000000002c2fa20] [c00000000023cfe8] __irq_exit_rcu+0x198/0x1c0 [    0.120408] [c000000002c2fa50] [c00000000023e0ec] irq_exit+0x1c/0x40 [    0.120415] [c000000002c2fa70] [c00000000002a7e8] timer_interrupt+0x178/0x310 [    0.120421] [c000000002c2fad0] [c000000000009ffc] decrementer_common_virt+0x28c/0x290 [    0.120428] ---- interrupt: 900 at plpar_hcall_norets_notrace+0x18/0x2c [    0.120435] NIP:  c0000000001ba998 LR: c0000000001c2584 CTR: 0000000000000000 [    0.120440] REGS: c000000002c2fb00 TRAP: 0900   Tainted: G D              (6.18.0-rc6-next-20251118) [    0.120445] MSR:  8000000002009033   CR: 22000222  XER: 20040006 [    0.120457] CFAR: 0000000000000000 IRQMASK: 0 [    0.120457] GPR00: 0000000000000000 c000000002c2fda0 c000000001e58100 0000000000000000 [    0.120457] GPR04: 000000000000ffff 0000000000000000 0000000000000000 0000000000000000 [    0.120457] GPR08: 0000000000000000 0000000000000000 80000000791afc00 ffffffffffffffff [    0.120457] GPR12: 0000000000000000 c000000002f90000 0000000000000000 0000000000000000 [    0.120457] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [    0.120457] GPR20: 0000000000c00000 0000000000000008 0000000000000000 0000000000000000 [    0.120457] GPR24: 0000000000000000 c000000000000000 c00000000a6e0000 000000000bde2ca0 [    0.120457] GPR28: c000000002cad140 c0000000022418e0 c0000000022418e8 c0000000022418e0 [    0.120513] NIP [c0000000001ba998] plpar_hcall_norets_notrace+0x18/0x2c [    0.120519] LR [c0000000001c2584] pseries_lpar_idle.part.0+0x74/0x160 [    0.120524] ---- interrupt: 900 [    0.120527] [c000000002c2fda0] [c000000a0036d500] 0xc000000a0036d500 (unreliable) [    0.120534] [c000000002c2fe20] [c0000000000214ac] arch_cpu_idle+0x4c/0x110 [    0.120541] [c000000002c2fe40] [c0000000013a0ca0] default_idle_call+0x50/0x140 [    0.120547] [c000000002c2fe60] [c0000000002bb6ec] cpuidle_idle_call+0x1ac/0x240 [    0.120554] [c000000002c2feb0] [c0000000002bb878] do_idle+0xf8/0x1a0 [    0.120560] [c000000002c2fef0] [c0000000002bbba4] cpu_startup_entry+0x44/0x50 [    0.120566] [c000000002c2ff20] [c0000000000113ac] rest_init+0xec/0xf0 [    0.120572] [c000000002c2ff50] [c0000000020054c0] do_initcalls+0x0/0x18c [    0.120580] [c000000002c2ffe0] [c00000000000ea9c] start_here_common+0x1c/0x20 [    0.120586] Code: eac1ffb0 eb21ffc8 eb41ffd0 eb81ffe0 ebc1fff0 ebe1fff8 7c0803a6 4e800020 38c00000 3d4200f1 38e00001 3c8200f1 <81260000> 394a1438 7d2807b4 7ca05028 [    0.120605] ---[ end trace 0000000000000000 ]--- [    0.120610] [    1.113513] Kernel panic - not syncing: Fatal exception [    1.122739] Rebooting in 10 seconds.. If you happen to fix this issue, please add below tag. Reported-by: Venkat Rao Bagalkote Regards, Venkat.