From: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
To: Madhavan Srinivasan <maddy@linux.ibm.com>,
Shrikanth Hegde <sshegde@linux.ibm.com>,
Ritesh Harjani <riteshh@linux.ibm.com>,
"Mukesh Kumar Chaurasiya (IBM)" <mkchauras@gmail.com>,
nandinih@linux.ibm.com
Cc: LKML <linux-kernel@vger.kernel.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: [BUG] powerpc: unrecoverable exception due to arch_local_irq_restore() called in NMI context on Power11
Date: Fri, 25 Sep 2026 20:05:43 +0530 [thread overview]
Message-ID: <d4cccba9-ce5c-424b-864c-2248fb0d99e6@linux.ibm.com> (raw)
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 <ME> 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 <ME> 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 <venkat88@linux.ibm.com>
Regards,
Venkat.
reply other threads:[~2026-09-25 14:35 UTC|newest]
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