From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f77.google.com (mail-io1-f77.google.com [209.85.166.77]) (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 7767476025 for ; Mon, 28 Jul 2025 13:22:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753708955; cv=none; b=aCgI2USCjkmu5iBBjqCQHSZSfFonVwxVot5KiA57gFtVHqwlgBVAJhRz4LWdKeUbYxk05nEO9HMIx9a0EtTXNuVaavGqJMF2MpMXg00PGPZMSiaI3JIKcaemfxQNnGBnqCFop6zXcxEpNgjpyYb7Q0MYxKMFOhHbgA2LrhV/ZRs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753708955; c=relaxed/simple; bh=o7g4zTvcHtDwGmDT8+bLd4ZcWMpMdAs4lGp6uBJ5z0g=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=KiV3cvZPa7hKXP00QxKgiw8dEE04seWXXN8CEfXpE80onYT7u5g6xbOFI3TCIhiqdjXoTmk/CbtfqdKuG403doB6/x2PcOCpfy2wOSzaB8WhhIj8HPjV9jTQToIUAxIPu8jdz/+UqW93wk5cwYdfjSB22vWuKD945YzP/gixycQ= 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=209.85.166.77 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-io1-f77.google.com with SMTP id ca18e2360f4ac-87c18a52977so377524339f.1 for ; Mon, 28 Jul 2025 06:22:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1753708952; x=1754313752; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=M37BM1rS9dk1eOmF/hynrK0dqgjnKGWFuRa9wzdrsm4=; b=QZbqAj+ioxeWrlflTA0tJ5rwwzwn4lmOzeGUSEwl/LPpGU17DnEci9HalLZ4MF1pGB YzNZoPJt2TWEToPNLb/0cOuH5p/sv30ny5CxC9wEQAgo4jhx6zHfG6+IDwo6ykK8gjzy fJKxXXvEkfqnZ5SVUIIFSV5DTlrlYK+Ecs4jxrn1vMjhmGuKnPiz9udbrLNSt4AMY0/l UVM48RKOv8ry/qHnKPPqNNE1Gyky7vojWhHqCeRL0KAnrbZjKAme3S2nM75gHk209zry jlDr9rOHvMrx7jQF0i7ciJZhvTFlWmYDz24aFx/+MBw8Pc6FR4E7Aq9Eejy4zGf+sjmI uU2Q== X-Gm-Message-State: AOJu0Yx0qJR8EgVjC6bHUATHJfCLn02uNdcH8S7qNSU5w2/T67KXM/sQ 2Be/q8oetxNjEv9X/PEyHyzUuN0UMQ6qXFjXH9jLJA4WNVsAqioPYdmqnoTCvvISoXjXrxFXgjW kvljgUWFk9x95JR1yXSvF/xXfDuxAZBHEhzhEsB4eSSx87IJ8LdEw6AIHgtLAhg== X-Google-Smtp-Source: AGHT+IEXFyDd6e9lHNVEP6wEN5d8KyTBn7T+p0OCOd/ju4jy5fpDBacDo8EQ84p3Ng6Jl6VWmWohamAYUbDBoix2DYMComZiqUgA Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a5d:8d12:0:b0:876:19b9:1aaa with SMTP id ca18e2360f4ac-88022a27cecmr1651783539f.9.1753708952325; Mon, 28 Jul 2025 06:22:32 -0700 (PDT) Date: Mon, 28 Jul 2025 06:22:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68877998.050a0220.1a379b.0005.GAE@google.com> Subject: [syzbot] [kernel?] WARNING in sched_mm_cid_remote_clear (3) From: syzbot To: linux-kernel@vger.kernel.org, luto@kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 25fae0b93d1d Merge tag 'drm-fixes-2025-07-24' of https://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=136930a2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9f175a9275d2cdd7 dashboard link: https://syzkaller.appspot.com/bug?extid=c3be4001853e1add0a03 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7acf9d19f311/disk-25fae0b9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/532080ae9996/vmlinux-25fae0b9.xz kernel image: https://storage.googleapis.com/syzbot-assets/47473831ee3b/bzImage-25fae0b9.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c3be4001853e1add0a03@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 1 PID: 12208 at ./include/linux/cpumask.h:135 cpu_max_bits_warn include/linux/cpumask.h:135 [inline] WARNING: CPU: 1 PID: 12208 at ./include/linux/cpumask.h:135 cpumask_check include/linux/cpumask.h:142 [inline] WARNING: CPU: 1 PID: 12208 at ./include/linux/cpumask.h:135 cpumask_clear_cpu include/linux/cpumask.h:620 [inline] WARNING: CPU: 1 PID: 12208 at ./include/linux/cpumask.h:135 __mm_cid_put kernel/sched/sched.h:3622 [inline] WARNING: CPU: 1 PID: 12208 at ./include/linux/cpumask.h:135 sched_mm_cid_remote_clear+0x488/0x4f0 kernel/sched/core.c:10543 Modules linked in: CPU: 1 UID: 0 PID: 12208 Comm: syz.4.2719 Not tainted 6.16.0-rc7-syzkaller-00034-g25fae0b93d1d #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:cpu_max_bits_warn include/linux/cpumask.h:135 [inline] RIP: 0010:cpumask_check include/linux/cpumask.h:142 [inline] RIP: 0010:cpumask_clear_cpu include/linux/cpumask.h:620 [inline] RIP: 0010:__mm_cid_put kernel/sched/sched.h:3622 [inline] RIP: 0010:sched_mm_cid_remote_clear+0x488/0x4f0 kernel/sched/core.c:10543 Code: 0f 01 e8 3b 71 0e 00 eb 9d 4c 89 ef e8 f1 73 97 00 e9 67 fc ff ff e8 e7 73 97 00 e9 47 fd ff ff 89 44 24 48 e9 17 fe ff ff 90 <0f> 0b 90 e9 f0 fd ff ff e8 8b b3 fc 09 e9 06 ff ff ff 48 89 d6 48 RSP: 0018:ffffc9000480fcc8 EFLAGS: 00010012 RAX: 0000000000000093 RBX: ffffe8ffffc476c0 RCX: ffffffff8189c611 RDX: 00000000ffffffff RSI: 0000000000000004 RDI: ffffc9000480fd10 RBP: 1ffff92000901f9a R08: 0000000000000001 R09: fffff52000901fa2 R10: 0000000000000003 R11: 0000000000000001 R12: ffff88807b22ed50 R13: ffffe8ffffc476c8 R14: 0000000000000200 R15: ffff8880b843a2c0 FS: 000055556f5a3500(0000) GS:ffff888124820000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558d727588 CR3: 00000000668d0000 CR4: 00000000003526f0 Call Trace: sched_mm_cid_remote_clear_old kernel/sched/core.c:10576 [inline] task_mm_cid_work+0x3b4/0x910 kernel/sched/core.c:10626 task_work_run+0x14d/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:114 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8ef99c1265 Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8 RSP: 002b:00007ffe741fc2d0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6 RAX: 0000000000000000 RBX: 00007f8ef9bb5fa0 RCX: 00007f8ef99c1265 RDX: 00007ffe741fc310 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f8ef9bb7ba0 R08: 0000000000000000 R09: 00007f8efa7eb000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000048110 R13: 00007f8ef9bb6080 R14: ffffffffffffffff R15: 00007ffe741fc450 --- 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