linux-kernel - [PowerPC][linux-next-6.11-rc7-20240910] Kernel Warnings at kernel/jump

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Message-ID: <ced64e0b-2ef7-48d6-b085-976aa878c017@linux.vnet.ibm.com>
Date: Wed, 11 Sep 2024 12:33:01 +0530
From: Venkat Rao Bagalkote <venkat88@...ux.vnet.ibm.com>
To: peterz@...radead.org, tglx@...utronix.de
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Sachin Sant <sachinp@...ux.ibm.com>
Subject: [PowerPC][linux-next-6.11-rc7-20240910] Kernel Warnings at
 kernel/jump_label.c:266

Greetings!!!


I am observing kernel warnings while booting with 
linux-next-6.11-rc7-20240910 kernel. Below are the warnings.


[   63.613506] WARNING: CPU: 20 PID: 214 at kernel/jump_label.c:266 
static_key_dec+0x78/0x8c
[   63.613518] Modules linked in: ext4 mbcache jbd2 dm_service_time 
sd_mod sg ibmvfc mlx5_core ibmvnic scsi_transport_fc ibmveth mlxfw 
psample dm_multipath dm_mirror dm_region_hash dm_log dm_mod fuse
[   63.613542] CPU: 20 UID: 0 PID: 214 Comm: kworker/20:1 Not tainted 
6.11.0-rc7-next-20240910-auto #1
[   63.613549] Hardware name: IBM,9080-HEX POWER10 (architected) 
0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_016) hv:phyp pSeries
[   63.613556] Workqueue: cgroup_destroy css_free_rwork_fn
[   63.613563] NIP:  c00000000048ca20 LR: c00000000048d060 CTR: 
c0000000005cb330
[   63.613568] REGS: c00000005a1afa80 TRAP: 0700   Not tainted 
(6.11.0-rc7-next-20240910-auto)
[   63.613573] MSR:  800000000282b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>  
CR: 24000884  XER: 20040001
[   63.613586] CFAR: c00000000048c9cc IRQMASK: 0
[   63.613586] GPR00: c00000000048d060 c00000005a1afd20 c0000000015f4300 
c000000002faa440
[   63.613586] GPR04: 0000000000000001 000000000000009e c0000000084bae00 
000000000000009d
[   63.613586] GPR08: 0000000000000000 0000000000000000 ffffffffffffffff 
c00000005b852780
[   63.613586] GPR12: c0000000005cb330 c000000c7db7df00 c0000000001a779c 
c0000000084b27c0
[   63.613586] GPR16: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000
[   63.613586] GPR20: c000000c7b914300 c000000002de73c8 c0000000027b07a8 
fffffffffffffef7
[   63.613586] GPR24: 0000000000000402 c00000005b852780 c000000008eabc05 
0000000000000010
[   63.613586] GPR28: c000000002d2fac0 c00000000e9d6000 c000000070444000 
c000000002faa440
[   63.613633] NIP [c00000000048ca20] static_key_dec+0x78/0x8c
[   63.613639] LR [c00000000048d060] 
__static_key_slow_dec_cpuslocked+0x38/0xb4
[   63.613645] Call Trace:
[   63.613647] [c00000005a1afd20] [c00000005a1afd50] 0xc00000005a1afd50 
(unreliable)
[   63.613653] [c00000005a1afd50] [c00000000048d124] 
static_key_slow_dec+0x48/0xb0
[   63.613660] [c00000005a1afdc0] [c0000000005cb40c] 
mem_cgroup_css_free+0xdc/0x104
[   63.613667] [c00000005a1afdf0] [c0000000002c4d58] 
css_free_rwork_fn+0x70/0x394
[   63.613673] [c00000005a1afe40] [c00000000019a7dc] 
process_one_work+0x1fc/0x4dc
[   63.613680] [c00000005a1afef0] [c00000000019b73c] 
worker_thread+0x340/0x504
[   63.613686] [c00000005a1aff90] [c0000000001a78cc] kthread+0x138/0x140
[   63.613691] [c00000005a1affe0] [c00000000000df98] 
start_kernel_thread+0x14/0x18
[   63.613697] Code: 7c0004ac 7c074800 40820018 38600001 5463063e 
4e800020 60000000 60000000 7ce93b78 4bffffa4 60000000 60000000 
<0fe00000> 38600001 7c60189e 5463063e
[   63.613711] ---[ end trace 0000000000000000 ]---


Issue is introduced by the commit: de752774f38bb766941ed1bf910ba5a9f6cc6bf7


Reverting the above commit, issue is not seen.


Regards,

Venkat.