Message-ID: <a0fee4a8-2406-45ba-8d66-ab02ca8a6928@w6rz.net>
Date: Wed, 22 Jan 2025 01:01:42 -0800
From: Ron Economos <re@...z.net>
To: Jon Hunter <jonathanh@...dia.com>,
 Salvatore Bonaccorso <carnil@...ian.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: stable@...r.kernel.org, patches@...ts.linux.dev,
 linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
 akpm@...ux-foundation.org, linux@...ck-us.net, shuah@...nel.org,
 patches@...nelci.org, lkft-triage@...ts.linaro.org, pavel@...x.de,
 f.fainelli@...il.com, sudipm.mukherjee@...il.com, srw@...dewatkins.net,
 rwarsow@....de, conor@...nel.org, hargar@...rosoft.com, broonie@...nel.org,
 "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 6.12 000/122] 6.12.11-rc1 review

On 1/21/25 23:04, Jon Hunter wrote:
> Hi Greg,
>
> On 21/01/2025 21:46, Salvatore Bonaccorso wrote:
>> Hi Greg,
>>
>> On Tue, Jan 21, 2025 at 06:50:48PM +0100, Greg Kroah-Hartman wrote:
>>> This is the start of the stable review cycle for the 6.12.11 release.
>>> There are 122 patches in this series, all will be posted as a response
>>> to this one.  If anyone has any issues with these being applied, please
>>> let me know.
>>>
>>> Responses should be made by Thu, 23 Jan 2025 17:45:02 +0000.
>>> Anything received after that time might be too late.
>>>
>>> The whole patch series can be found in one patch at:
>>>     https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.12.11-rc1.gz 
>>>
>>> or in the git tree and branch at:
>>>     git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git 
>>> linux-6.12.y
>>> and the diffstat can be found below.
>>
>> Built and lightly tested, when booting I'm noticing the following in
>> dmesg:
>>
>> [  +0.007932] ------------[ cut here ]------------
>> [  +0.000003] WARNING: CPU: 1 PID: 0 at kernel/sched/fair.c:5250 
>> place_entity+0x127/0x130
>> [  +0.000006] Modules linked in: ahci(E) libahci(E) crc32_pclmul(E) 
>> xhci_hcd(E) libata(E) psmouse(E) crc32c_intel(E) >
>> [  +0.000021] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: 
>> G            E      6.12.11-rc1+ #1
>> [  +0.000004] Tainted: [E]=UNSIGNED_MODULE
>> [  +0.000002] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), 
>> BIOS 1.16.2-debian-1.16.2-1 04/01/2014
>> [  +0.000002] RIP: 0010:place_entity+0x127/0x130
>> [  +0.000003] Code: 01 6b 28 c6 43 52 00 5b 5d 41 5c 41 5d 41 5e e9 
>> 2f 83 bc 00 b9 02 00 00 00 49 c1 ee 0a 49 39 ce 4>
>> [  +0.000002] RSP: 0018:ffffbe1f400f8d08 EFLAGS: 00010046
>> [  +0.000003] RAX: 0000000000000000 RBX: ffff9ed7c0c0f200 RCX: 
>> 00000000000000c2
>> [  +0.000002] RDX: 0000000000000000 RSI: 000000000000001d RDI: 
>> 000000000078cfd5
>> [  +0.000002] RBP: 0000000029d40d60 R08: 00000000a8e83f00 R09: 
>> 0000000000000002
>> [  +0.000002] R10: 00000000006e3ab2 R11: ffff9ed7d4056690 R12: 
>> ffff9ed83bd360c0
>> [  +0.000002] R13: 0000000000000000 R14: 00000000000000c2 R15: 
>> 000000000016e360
>> [  +0.000003] FS:  0000000000000000(0000) GS:ffff9ed83bd00000(0000) 
>> knlGS:0000000000000000
>> [  +0.000002] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [  +0.000002] CR2: 00007f9f5a7245d8 CR3: 0000000100bfc000 CR4: 
>> 0000000000350ef0
>> [  +0.000003] Call Trace:
>> [  +0.000003]  <IRQ>
>> [  +0.000002]  ? place_entity+0x127/0x130
>> [  +0.000002]  ? __warn.cold+0x93/0xf6
>> [  +0.000004]  ? place_entity+0x127/0x130
>> [  +0.000003]  ? report_bug+0xff/0x140
>> [  +0.000005]  ? handle_bug+0x58/0x90
>> [  +0.000002]  ? exc_invalid_op+0x17/0x70
>> [  +0.000003]  ? asm_exc_invalid_op+0x1a/0x20
>> [  +0.000006]  ? place_entity+0x127/0x130
>> [  +0.000003]  ? place_entity+0x99/0x130
>> [  +0.000004]  reweight_entity+0x1af/0x1d0
>> [  +0.000003]  enqueue_task_fair+0x30c/0x5e0
>> [  +0.000005]  enqueue_task+0x35/0x150
>> [  +0.000004]  activate_task+0x3a/0x60
>> [  +0.000003]  sched_balance_rq+0x7c6/0xee0
>> [  +0.000008]  sched_balance_domains+0x25b/0x350
>> [  +0.000005]  handle_softirqs+0xcf/0x280
>> [  +0.000006]  __irq_exit_rcu+0x8d/0xb0
>> [  +0.000003]  sysvec_apic_timer_interrupt+0x71/0x90
>> [  +0.000003]  </IRQ>
>> [  +0.000002]  <TASK>
>> [  +0.000002]  asm_sysvec_apic_timer_interrupt+0x1a/0x20
>> [  +0.000002] RIP: 0010:pv_native_safe_halt+0xf/0x20
>> [  +0.000004] Code: 22 d7 e9 b4 01 01 00 0f 1f 40 00 90 90 90 90 90 
>> 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 0>
>> [  +0.000002] RSP: 0018:ffffbe1f400bbed8 EFLAGS: 00000202
>> [  +0.000003] RAX: 0000000000000001 RBX: ffff9ed7c033e600 RCX: 
>> ffff9ed7c0647830
>> [  +0.000001] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 
>> 00000000000017b4
>> [  +0.000002] RBP: 0000000000000001 R08: 0000000000000001 R09: 
>> 0000000000000000
>> [  +0.000002] R10: 0000000000000001 R11: 0000000000000000 R12: 
>> 0000000000000000
>> [  +0.000001] R13: 0000000000000000 R14: 0000000000000000 R15: 
>> 0000000000000000
>> [  +0.000006]  default_idle+0x9/0x20
>> [  +0.000003]  default_idle_call+0x29/0x100
>> [  +0.000002]  do_idle+0x1fe/0x240
>> [  +0.000005]  cpu_startup_entry+0x29/0x30
>> [  +0.000003]  start_secondary+0x11e/0x140
>> [  +0.000004]  common_startup_64+0x13e/0x141
>> [  +0.000007]  </TASK>
>> [  +0.000001] ---[ end trace 0000000000000000 ]---
>>
>> Not yet bisected which change causes it.
>
>
> I am seeing the same on Tegra. I have not looked to see which change 
> this is yet either.
>
> Jon
>
Seeing this on RISC-V also.

Jan 21 23:51:10 riscv64 kernel: WARNING: CPU: 3 PID: 16 at 
kernel/sched/fair.c:5250 place_entity+0x108/0x110
Jan 21 23:51:10 riscv64 kernel: Modules linked in:
Jan 21 23:51:10 riscv64 kernel: CPU: 3 UID: 0 PID: 16 Comm: rcu_preempt 
Not tainted 6.12.11-rc1 #2
Jan 21 23:51:10 riscv64 kernel: Hardware name: SiFive HiFive Unmatched 
A00 (DT)
Jan 21 23:51:10 riscv64 kernel: epc : place_entity+0x108/0x110
Jan 21 23:51:10 riscv64 kernel:  ra : place_entity+0x9c/0x110
Jan 21 23:51:10 riscv64 kernel: epc : ffffffff8006ed68 ra : 
ffffffff8006ecfc sp : ffffffc60009bac0
Jan 21 23:51:10 riscv64 kernel:  gp : ffffffff81fa6318 tp : 
ffffffd680323b00 t0 : 0000000000000000
Jan 21 23:51:10 riscv64 kernel:  t1 : 0000000000000000 t2 : 
0000000000000000 s0 : ffffffc60009bb00
Jan 21 23:51:10 riscv64 kernel:  s1 : ffffffd6809f5000 a0 : 
000000000053b491 a1 : 0000000000000000
Jan 21 23:51:10 riscv64 kernel:  a2 : 0000000000000002 a3 : 
0000000000000000 a4 : 0000000000000000
Jan 21 23:51:10 riscv64 kernel:  a5 : 0000000000000000 a6 : 
0000000000000000 a7 : 0000000000000000
Jan 21 23:51:10 riscv64 kernel:  s2 : 0000000031acb37b s3 : 
0000000000000000 s4 : 000000000006920d
Jan 21 23:51:10 riscv64 kernel:  s5 : ffffffd9fedb2a00 s6 : 
ffffffd9fedb2900 s7 : ffffffd6829cbb00
Jan 21 23:51:10 riscv64 kernel:  s8 : 0000000000000000 s9 : 
0000000000000001 s10: 0000000000000201
Jan 21 23:51:10 riscv64 kernel:  s11: 0000000000000000 t3 : 
0000000000000000 t4 : 0000000000000000
Jan 21 23:51:10 riscv64 kernel:  t5 : 0000000000000000 t6 : 0000000000000000
Jan 21 23:51:10 riscv64 kernel: status: 0000000200000100 badaddr: 
0000000000000002 cause: 0000000000000003
Jan 21 23:51:10 riscv64 kernel: [<ffffffff8006ed68>] 
place_entity+0x108/0x110
Jan 21 23:51:10 riscv64 kernel: [<ffffffff8006efe2>] 
reweight_entity+0x182/0x1b0
Jan 21 23:51:10 riscv64 kernel: [<ffffffff8006f0c8>] 
update_cfs_group+0x78/0xa8
Jan 21 23:51:10 riscv64 kernel: [<ffffffff8006fc4c>] 
dequeue_entities+0x114/0x3d8
Jan 21 23:51:10 riscv64 kernel: [<ffffffff80070084>] 
pick_task_fair+0xb4/0x110
Jan 21 23:51:10 riscv64 kernel: [<ffffffff80077a3c>] 
pick_next_task_fair+0x1c/0x2f0
Jan 21 23:51:10 riscv64 kernel: [<ffffffff80dc5556>] __schedule+0x176/0xc20
Jan 21 23:51:10 riscv64 kernel: [<ffffffff80dc6022>] schedule+0x22/0x148
Jan 21 23:51:10 riscv64 kernel: [<ffffffff80dcc072>] 
schedule_timeout+0x82/0x178
Jan 21 23:51:10 riscv64 kernel: [<ffffffff800cb996>] 
rcu_gp_fqs_loop+0x346/0x4e8
Jan 21 23:51:10 riscv64 kernel: [<ffffffff800cea62>] 
rcu_gp_kthread+0x12a/0x150
Jan 21 23:51:10 riscv64 kernel: [<ffffffff8004db58>] kthread+0xc8/0xe8
Jan 21 23:51:10 riscv64 kernel: [<ffffffff80dceefe>] ret_from_fork+0xe/0x18
Jan 21 23:51:10 riscv64 kernel: ---[ end trace 0000000000000000 ]---

Reverting commit 11d21f2ae4a254aeef84fcf7b6314f5dd045151f "sched/fair: 
Fix EEVDF entity placement bug causing scheduling lag" removes the warning.

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