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Fri, 25 Sep 2026 14:35:44 +0000 (GMT) Received: from [9.61.242.145] (unknown [9.61.242.145]) by smtpav03.dal12v.mail.ibm.com (Postfix) with ESMTP; Fri, 25 Sep 2026 14:35:44 +0000 (GMT) Message-ID: Date: Fri, 25 Sep 2026 20:05:43 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-GB To: Madhavan Srinivasan , Shrikanth Hegde , Ritesh Harjani , "Mukesh Kumar Chaurasiya (IBM)" , nandinih@linux.ibm.com Cc: LKML , linuxppc-dev From: Venkat Rao Bagalkote Subject: [BUG] powerpc: unrecoverable exception due to arch_local_irq_restore() called in NMI context on Power11 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: di60XduoevU9mIEv7nilN36jqMGmllww X-Proofpoint-Spam-Info: AW1haW4tMjYwOTI1MDA1OCBTYWx0ZWRfXzcP/x3M5v3IP uzpuTIRBHU3Abbsil8tYh4el26SvsxETLgfhMguJuRtSn2CVrAYwokTCOEACGCs36AdGf83jGqU hmYOqaoXP1eL1f1AMpV8Ij4C+CMrsRw= X-Authority-Analysis: v=2.4 cv=FLiOVOos c=1 sm=1 tr=0 ts=6ab686c6 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=S-y81fhqRhZvH5zLhZwA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: JpKBIopxW_M7YMfijINCTLsNgotVPFzW X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTI1MDA1OCBTYWx0ZWRfXyyQs8MbWpIeV ikHJNCHdsVHWz67Ba5P14DP4r5F85D0SffNp+8rdbeZm0j9GtvR0pGSiL3N31ZkiwNx7xRzn8UU kjMcsHmBARwbT7L/51bhZzzzoyyyK+fpadYa2DPJLyfKNm65skK6B5UlokBP+HshLdUGklIoxH+ G7U4cOhRU2XMCJ6DZscXI+HIIS88cT+ZvM9JpGPLMziF2LtzWeA2LIvNDzcKZFaIolsJQJGDG8o DNWtTx4QLRzOs1qfjHGaMRBNFfCfoFaHFOKoyOwAwg658O3i+nL11ne7K45dExnd+uF7WC+eHJX 5otfRZNXg+VWHEFplzmTq9P7OxMLSzxvN1pW5qM1FArZuPJt7JlbI7cAzgiiko8voClJ1/yrtTY fctAbYVWD7J3bMJtgB5iFnKLQ1g5jq3CR3hFrzEmo2o0sRKP+2fd0qKmILPr14WlXCKcIyxhwqH yii4eUF3JcTbU348Wtg== 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=2026-09-25_02,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 impostorscore=0 phishscore=0 spamscore=0 clxscore=1015 suspectscore=0 bulkscore=0 lowpriorityscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609250058 Hello, IBM CI has reported has reported an unrecoverable kernel exception on Power11 pSeries systems triggered reliably by running a parallel kernel build. Hardware -------- IBM,9080-HEX Power11 (architected) 0x820200 hv:phyp pSeries, FW1110.01 (NH1110_069) 32 CPUs, 60GB RAM Kernel ------ powerpc/linux.git merge branch commit b0956825c (2026-09-21 "Automatic merge of 'fixes' into merge") Config ------ CONFIG_PPC_IRQ_SOFT_MASK_DEBUG=y CONFIG_PROVE_LOCKING=y CONFIG_LOCKDEP=y CONFIG_PPC_WATCHDOG=y PREEMPT_DYNAMIC (lazy mode) Reproducer ----------   make clean && make -j$(nproc) Triggers within ~120 seconds on a 32-CPU Power11 system. Symptoms -------- First, two WARNINGs fire at irq_64.c:217/218:   [121.124041] WARNING: arch/powerpc/kernel/irq_64.c:217 at                arch_local_irq_restore+0x290/0x328, CPU#1: make/6861   [121.124113] LR [c0000000005036d8] trace_hardirqs_on_prepare+0x98/0x150   [121.124117] Call Trace:   [121.124120]  trace_hardirqs_on_prepare+0x98/0x150   [121.124123]  irqentry_nmi_exit+0x12c/0x168   [121.124128]  soft_nmi_interrupt+0x468/0x6c4   [121.124131]  soft_nmi_common+0x1b0/0x28c   [121.124134]  ---- interrupt: 900 at end_real_trampolines+0x0/0x1000   [121.124184] WARNING: arch/powerpc/kernel/irq_64.c:218 at                arch_local_irq_restore+0x2a0/0x328, CPU#1: make/6861 Followed by an unrecoverable exception: [  202.258332] Oops: Exception in kernel mode, sig: 4 [#1] [  202.258527] LE PAGE_SIZE=4K MMU=Radix  SMP NR_CPUS=8192 NUMA pSeries [  202.258531] Modules linked in: nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bonding tls ip_set nf_tables rfkill fsdev_dax kmem device_dax pseries_rng vmx_crypto dax_pmem fuse ext4 crc16 mbcache jbd2 sd_mod nd_pmem papr_scm sg libnvdimm ibmvscsi ibmveth scsi_transport_srp pseries_wdt [  202.258570] CPU: 2 UID: 0 PID: 1598 Comm: git-remote-http Kdump: loaded Tainted: G        W           7.3.0-rc4+ #2 PREEMPT(lazy) [  202.258576] Tainted: [W]=WARN [  202.258578] Hardware name: IBM,9080-HEX Power11 (architected) 0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries [  202.258582] NIP:  000000000003e178 LR: c00000000003e174 CTR: 0000000000000000 [  202.258586] REGS: c000000effc17d60 TRAP: 0700   Tainted: G   W            (7.3.0-rc4+) [  202.258590] MSR:  0000000000081000   CR: 00000000 XER: e0017930 [  202.258596] CFAR: c00000000000d158 IRQMASK: 0 GPR00: c000000effc17930 0000000000000000 c000000002252580 c000000002252600 GPR04: c000000effc179a0 c000000effc17a08 c000000effc179e0 0000000000000000 GPR08: c00000000002c254 0000000000000000 0000000000000000 0000000000000000 GPR12: 0000000000000000 c000000effffdf00 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 c000000002267878 GPR20: c000000effc179e0 0000000000000000 0000000000000000 0000000000000001 GPR24: 0000000000000800 0000000000000003 0000000000000000 c000000002259970 GPR28: c000000effc17ba0 0000000000000009 c00000000003dc60 c000000002267878 [  202.258637] NIP [000000000003e178] 0x3e178 [  202.258642] LR [c00000000003e174] arch_local_irq_restore+0x2a4/0x328 [  202.258649] Call Trace: [  202.258651] [c000000effc17b80] [c000000000023afc] show_regs+0x5c/0x1d4 (unreliable) [  202.258658] [c000000effc17c30] [c00000000002d05c] __die+0x114/0x17c [  202.258663] [c000000effc17cc0] [c00000000002dd44] die+0x74/0xe4 [  202.258669] [c000000effc17d00] [c000000000031dd0] program_check_exception+0x3c/0xf0 [  202.258675] [c000000effc17d30] [c000000000009b2c] program_check_common_virt+0x3bc/0x3c0 [  202.258680] ---- interrupt: 700 at 0x3e178 [  202.258683] NIP:  000000000003e178 LR: c00000000003e174 CTR: 0000000000000000 [  202.258687] REGS: c000000effc17d60 TRAP: 0700   Tainted: G   W            (7.3.0-rc4+) [  202.258690] MSR:  0000000000081000   CR: 00000000 XER: e0017930 [  202.258695] CFAR: c00000000000d158 IRQMASK: 0 GPR00: c000000effc17930 0000000000000000 c000000002252580 c000000002252600 GPR04: c000000effc179a0 c000000effc17a08 c000000effc179e0 0000000000000000 GPR08: c00000000002c254 0000000000000000 0000000000000000 0000000000000000 GPR12: 0000000000000000 c000000effffdf00 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 c000000002267878 GPR20: c000000effc179e0 0000000000000000 0000000000000000 0000000000000001 GPR24: 0000000000000800 0000000000000003 0000000000000000 c000000002259970 GPR28: c000000effc17ba0 0000000000000009 c00000000003dc60 c000000002267878 [  202.258735] NIP [000000000003e178] 0x3e178 [  202.258738] LR [c00000000003e174] arch_local_irq_restore+0x2a4/0x328 [  202.258743] ---- interrupt: 700 [  202.258745] Code: 892d0153 2c090000 4082fe30 992d0152 4bfffde0 60000000 0fe00000 4bfffda0 60000000 60000000 0fe00000 4bfffda0 <60000000> 60000000 0fe00000 4bfffd9c [  202.258760] ---[ end trace 0000000000000000 ]--- If you happen to fix this, please add below tag. Reported-by: Venkat Rao Bagalkote Regards, Venkat.