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Message-ID: <5ef3eb20-d1db-41d0-83cf-4a78439e4a3c@linux.ibm.com>
Date: Tue, 18 Nov 2025 12:10:07 +0530
From: Venkat Rao Bagalkote <venkat88@...ux.ibm.com>
To: LKML <linux-kernel@...r.kernel.org>,
Linux Next Mailing List <linux-next@...r.kernel.org>,
Madhavan Srinivasan <maddy@...ux.ibm.com>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Ingo Molnar <mingo@...nel.org>,
Shrikanth Hegde <sshegde@...ux.ibm.com>
Subject: [linux-next20251118] BUG: Kernel NULL pointer dereference
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 <SF,EE,ME,IR,DR,RI,LE> 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 <SF,VEC,EE,ME,IR,DR,RI,LE> 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 <venkat88@...ux.ibm.com>
Regards,
Venkat.
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