From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2ADC2302CD7 for ; Mon, 24 Nov 2025 11:56:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763985389; cv=none; b=aKbyV/iECLjj6QrKv/vhTk2YmlVgKAc2xqD5+qi/p7KfK8ee4xuqlgpUqxXhEaZuGThyscjgFjc+ciY4km8U2zDiMU7SVMLlZgR+eKtCcOgrKXdDrF7P/SlVpgZtCL/LukK/BjS1MW8nAqC1PY9tqgh/bzFKTCndHVtyX7sK1Zo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763985389; c=relaxed/simple; bh=uXYRbzdhNb9xalgcSIiqeOxri1tRlIRaXGdkjZtroNc=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=GW39lQAZuJJfUnxjthFi56k952fRU2DKTJT4pGDlJon3mZM3ED+aO15Q8xeXawXp6Ry2zgY+b9CJNuugK3zD2J4uiVXOLjIEr19Mi2IqELTIJ407ZkkLTP52HNjcRIF29InG+UBkgvr2aH5y+MwRJmllPD+SijQzFREy+LiG1V8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.208 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f208.google.com with SMTP id e9e14a558f8ab-43373c85296so34695615ab.2 for ; Mon, 24 Nov 2025 03:56:27 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763985387; x=1764590187; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=uBCd5DbVeMvUPrrKqW8ltwsM9/oolhLx+khqbz2hCAE=; b=iMsdg8Gqa1KHwwg3NL04YqJGRRoJFnE5EK1F0QaEBRu7dB9CkKa+dmo1v0jog1oo45 XSjV+LcZCxnBChZ2K8yPFtY/3yUeQwT7bO3kLuHXnAmIUE/p/t7KMYykSkrKjAEH5Xl/ BZHXrhJ0vNxshFggIS6Sd213budmTXg+mxi3J9Ny7fyOq1YTCdM1GahTQ5ZPcwOdp1VA sNN+FpFxGRKqk7JNXDbfJdAXXKtoMQ1ghBzTsP2hTXIsnm2CHY5ot2gh5eVtU4RIWtWY QnJVX4MEkwBqz37Ee7hWqXiRDJBIiFjO5UHKMUJ/yqoUdEmy3oqn1LYOWVgFN2gVGqjf Lq1A== X-Forwarded-Encrypted: i=1; AJvYcCXC/fp5G1MVz1vQ62GnV/jGO+dEQaz+/mfuz4DTlXJ145doDFQkN8FFVUvigwSNYMC/AggWEF8u7joMHcw=@vger.kernel.org X-Gm-Message-State: AOJu0Yyu/GqVHi0sxHidrGaikhIR6W2AduFy5LiD3lGsNAKdQ07MgkfT mHWyvtw15dydGUDA/XPUBveYnjgqzHX7eaRD9ruzbBMlnPQMwCBWp8PjzUgcSRe+LpTtrGL1kpr EUGV9lTCw3RNP4fjYebxEmZyfPGHD4fLWOYRm1U1raz4t9uzrre51V3RxGDk= X-Google-Smtp-Source: AGHT+IHh19TkRztieKVNUKsqZVAdhtnsSCCkBs8moSEQMe1D+u+JGxg5HS//a8Oo2zyO/X0acWJnN2CyNCpSKWV7n5HW7USoCjPy Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a25:b0:433:2cdf:6457 with SMTP id e9e14a558f8ab-435b8c21695mr81316705ab.12.1763985387314; Mon, 24 Nov 2025 03:56:27 -0800 (PST) Date: Mon, 24 Nov 2025 03:56:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <692447eb.a70a0220.d98e3.0087.GAE@google.com> Subject: [syzbot] [kernel?] KMSAN: uninit-value in psi_group_change From: syzbot To: bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 23cb64fb7625 Merge tag 'soc-fixes-6.18-3' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1354f692580000 kernel config: https://syzkaller.appspot.com/x/.config?x=61a9bf3cc5d17a01 dashboard link: https://syzkaller.appspot.com/bug?extid=864964d448db80eb0593 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/af4aff9f19b2/disk-23cb64fb.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c70c6cd0be2c/vmlinux-23cb64fb.xz kernel image: https://storage.googleapis.com/syzbot-assets/d1634eb1df91/bzImage-23cb64fb.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+864964d448db80eb0593@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in psi_group_change+0xf98/0x13c0 kernel/sched/psi.c:845 psi_group_change+0xf98/0x13c0 kernel/sched/psi.c:845 psi_task_change+0x390/0x710 kernel/sched/psi.c:922 psi_dequeue kernel/sched/stats.h:191 [inline] dequeue_task+0x6c5/0x770 kernel/sched/core.c:2117 deactivate_task+0x51/0x70 kernel/sched/core.c:2152 detach_task+0x119/0x360 kernel/sched/fair.c:9496 detach_tasks kernel/sched/fair.c:9632 [inline] sched_balance_rq+0x7cc8/0xa700 kernel/sched/fair.c:11807 sched_balance_newidle+0x668/0x14f0 kernel/sched/fair.c:12855 pick_next_task_fair+0x95/0xed0 kernel/sched/fair.c:8931 __pick_next_task+0x120/0x700 kernel/sched/core.c:5969 pick_next_task kernel/sched/core.c:6054 [inline] __schedule+0xc27/0x7790 kernel/sched/core.c:6870 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0x17d/0x3c0 kernel/sched/core.c:7026 worker_thread+0x12f9/0x1590 kernel/workqueue.c:3442 kthread+0xd5c/0xf00 kernel/kthread.c:463 ret_from_fork+0x1f5/0x4c0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was created at: slab_post_alloc_hook mm/slub.c:4985 [inline] slab_alloc_node mm/slub.c:5288 [inline] __do_kmalloc_node mm/slub.c:5649 [inline] __kmalloc_node_track_caller_noprof+0xb4b/0x1ba0 mm/slub.c:5759 __kmemdup_nul mm/util.c:64 [inline] kstrdup+0x8a/0x2a0 mm/util.c:84 kstrdup_const+0x5e/0x90 mm/util.c:104 kvasprintf_const+0x195/0x370 lib/kasprintf.c:-1 kobject_set_name_vargs+0x87/0x2f0 lib/kobject.c:274 kobject_add_varg lib/kobject.c:368 [inline] kobject_init_and_add+0x2f4/0x4e0 lib/kobject.c:457 bus_add_driver+0x41e/0xdb0 drivers/base/bus.c:671 driver_register+0x42e/0x6a0 drivers/base/driver.c:249 __auxiliary_driver_register+0x24f/0x380 drivers/base/auxiliary.c:376 ljca_spi_driver_init+0x2c/0x40 drivers/spi/spi-ljca.c:290 do_one_initcall+0x237/0xb60 init/main.c:1283 do_initcall_level+0x157/0x2e0 init/main.c:1345 do_initcalls+0x176/0x310 init/main.c:1361 do_basic_setup+0x1d/0x30 init/main.c:1380 kernel_init_freeable+0x275/0x4a0 init/main.c:1593 kernel_init+0x2f/0x5e0 init/main.c:1483 ret_from_fork+0x1f5/0x4c0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 CPU: 1 UID: 0 PID: 3781 Comm: kworker/u8:13 Tainted: G W syzkaller #0 PREEMPT(none) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: 0x0 (events_unbound) ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup