linux-kernel - Re: [tip: sched/urgent] sched/fair: Use sched_domain_span() for topology_span

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Message-ID: <20250704102103.GAaGerDxWX7VhePA3j@fat_crate.local>
Date: Fri, 4 Jul 2025 12:21:03 +0200
From: Borislav Petkov <bp@...en8.de>
To: K Prateek Nayak <kprateek.nayak@....com>
Cc: linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
	Leon Romanovsky <leon@...nel.org>,
	Valentin Schneider <vschneid@...hat.com>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Steve Wahl <steve.wahl@....com>, x86@...nel.org
Subject: Re: [tip: sched/urgent] sched/fair: Use sched_domain_span() for
 topology_span_sane()

On Fri, Jul 04, 2025 at 09:13:16AM -0000, tip-bot2 for K Prateek Nayak wrote:
> The following commit has been merged into the sched/urgent branch of tip:
> 
> Commit-ID:     02bb4259ca525efa39a2531cb630329fb87fc968
> Gitweb:        https://git.kernel.org/tip/02bb4259ca525efa39a2531cb630329fb87fc968
> Author:        K Prateek Nayak <kprateek.nayak@....com>
> AuthorDate:    Mon, 30 Jun 2025 06:10:59 
> Committer:     Peter Zijlstra <peterz@...radead.org>
> CommitterDate: Fri, 04 Jul 2025 10:35:56 +02:00
> 
> sched/fair: Use sched_domain_span() for topology_span_sane()

My guest doesn't like this one and reverting it ontop of the whole tip lineup
fixes it.

Holler for more data if needed.

[    0.280062] Timer migration: 2 hierarchy levels; 8 children per group; 2 crossnode level
[    0.282922] NMI watchdog: Enabled. Permanently consumes one hw-PMU counter.
[    0.287572] smp: Bringing up secondary CPUs ...
[    0.288623] smpboot: x86: Booting SMP configuration:
[    0.289085] .... node  #0, CPUs:        #1  #2  #3  #4  #5  #6  #7  #8  #9 #10 #11 #12 #13 #14 #15
[    0.302358] smp: Brought up 1 node, 16 CPUs
[    0.304445] smpboot: Total of 16 processors activated (118401.12 BogoMIPS)
[    0.307884] BUG: unable to handle page fault for address: 0000000089c402fb
[    0.307884] #PF: supervisor read access in kernel mode
[    0.307884] #PF: error_code(0x0000) - not-present page
[    0.307884] PGD 0 P4D 0 
[    0.307950] Oops: Oops: 0000 [#1] SMP NOPTI
[    0.308344] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.16.0-rc4+ #1 PREEMPT(full) 
[    0.309115] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-8 02/21/2024
[    0.309934] RIP: 0010:build_sched_domains+0x627/0x1550
[    0.310086] Code: 84 75 06 00 00 f3 48 0f bc c0 48 63 f8 89 c0 48 0f a3 05 c4 cf 95 08 0f 83 6c 06 00 00 48 8b 3c fd c0 db 29 82 49 8b 44 24 18 <48> 8b 04 07 48 8b 80 90 00 00 00 48 33 86 90 00 00 00 66 85 c0 0f
[    0.310086] RSP: 0018:ffffc9000001fe60 EFLAGS: 00010247
[    0.310086] RAX: ffffffff89c402f8 RBX: ffff88800cea8e40 RCX: 0000000000000001
[    0.310086] RDX: ffffffffffffffff RSI: ffff88800ceaacc0 RDI: 0000000100000003
[    0.310086] RBP: ffff88800cc4e3e0 R08: 0000000000000000 R09: 0000000000000000
[    0.310086] R10: 00000000fffedb1d R11: 00000000fffedb1d R12: ffff88800ceda4c0
[    0.310086] R13: ffff88800cea9500 R14: 0000000000000010 R15: 000000000000000f
[    0.310086] FS:  0000000000000000(0000) GS:ffff8880f39f2000(0000) knlGS:0000000000000000
[    0.310086] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.310086] CR2: 0000000089c402fb CR3: 0000000002c1a000 CR4: 00000000003506f0
[    0.310086] Call Trace:
[    0.310086]  <TASK>
[    0.310086]  ? sched_init_domains+0x58/0xa0
[    0.310086]  sched_init_smp+0x29/0x90
[    0.310086]  kernel_init_freeable+0xa3/0x290
[    0.310086]  ? __pfx_kernel_init+0x10/0x10
[    0.310086]  kernel_init+0x1a/0x1c0
[    0.310086]  ret_from_fork+0x85/0xf0
[    0.310086]  ? __pfx_kernel_init+0x10/0x10
[    0.310086]  ret_from_fork_asm+0x1a/0x30
[    0.310086]  </TASK>
[    0.310086] Modules linked in:
[    0.310086] CR2: 0000000089c402fb
[    0.310086] ---[ end trace 0000000000000000 ]---
[    0.310086] RIP: 0010:build_sched_domains+0x627/0x1550
[    0.310086] Code: 84 75 06 00 00 f3 48 0f bc c0 48 63 f8 89 c0 48 0f a3 05 c4 cf 95 08 0f 83 6c 06 00 00 48 8b 3c fd c0 db 29 82 49 8b 44 24 18 <48> 8b 04 07 48 8b 80 90 00 00 00 48 33 86 90 00 00 00 66 85 c0 0f
[    0.310086] RSP: 0018:ffffc9000001fe60 EFLAGS: 00010247
[    0.310086] RAX: ffffffff89c402f8 RBX: ffff88800cea8e40 RCX: 0000000000000001
[    0.310086] RDX: ffffffffffffffff RSI: ffff88800ceaacc0 RDI: 0000000100000003
[    0.310086] RBP: ffff88800cc4e3e0 R08: 0000000000000000 R09: 0000000000000000
[    0.310086] R10: 00000000fffedb1d R11: 00000000fffedb1d R12: ffff88800ceda4c0
[    0.310086] R13: ffff88800cea9500 R14: 0000000000000010 R15: 000000000000000f
[    0.310086] FS:  0000000000000000(0000) GS:ffff8880f39f2000(0000) knlGS:0000000000000000
[    0.310086] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.310086] CR2: 0000000089c402fb CR3: 0000000002c1a000 CR4: 00000000003506f0
[    0.310086] note: swapper/0[1] exited with irqs disabled
[    0.310091] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
[    0.311130] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 ]---

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette