From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f207.google.com (mail-oi1-f207.google.com [209.85.167.207]) (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 A78472E63C for ; Sat, 21 Mar 2026 00:47:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774054050; cv=none; b=rQ1wT6lCfROYj1wGkGP2aFyn9CTC2sV/IETZKuFTUYOrrBbzQytX32bx2s3ylyeNVc63oShqYN7F3/opUOkJ2+CLNpzyKjDHcS2IeKHRUhEBiQKLxqzWhCA/2WcR0V0x5xSNdFxLRDxmI3nuthKODwOqb8f0yL7XgoVbdbNyKS0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774054050; c=relaxed/simple; bh=mCfCLcnVBUMKRjfSmzDdB5Jo4YTGtjPypVBVLhaxm/s=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=HMhNSrl3VIFOkKAMEwgFm6kzqlheVxWc5u0pn0deDNM9JpXv2IpuPXGHDx8zGSKL5NLbsPlW2ssH7h/IIoIJ4TG4hIJ0vfWy1giV9WIwh4vpF/2mlq2ys5DQ+XCRd7Z6gdk8Z4LRAAUGjk+hDLJohGEulEFN5T6ZY948DdC7KEg= 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=209.85.167.207 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-oi1-f207.google.com with SMTP id 5614622812f47-466ed1116a9so18111785b6e.1 for ; Fri, 20 Mar 2026 17:47:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774054047; x=1774658847; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=vbyZyapI8I1HIyw94jYfA+mxxqS/lcjRjeWGXJzTWvM=; b=jWpimPHWFXKlRo6S3Yoc1UxsubD689nfGVgqUjinOwPlsgxvQf+TbIhaVaKdudYL4X orpdmuCZ9DxYAzVj4hdeOOGWd9YTE4vwKFV7h4cRtSlxcF11fqNY5Tg6ZSgBJqh8g1p0 z14Q/hVo3wcPzsDeXs1/QacMqeAN56j0jlQ61nWOIgxgn3VvjreL8uOxTHGN3f5xelCX J3q2itxiOZG2aGG9ajHefrqCMyMeQzdEirJoMSPpJL8yiCrrreB9AKx7kV0g2rkLwCEA 8A5+pdKZr3j/j05YzFEA+24vCs2pPxETfzaALSR1n/eDNg7R2pHZzo3BdK6SmD59auBv zZvw== X-Gm-Message-State: AOJu0Yz5uK3HzYYi2EaLjazN+smO9YDN9Jtk2or/A1g7MDWji5p72tse Pn+gDUfyCrI+RgbxHrvZGrl2DjOdbY3FzhWWHI1tK8/mUxexwwgTIu1KklTJQ3Bc+iZUbep2p4Q ko9bPmsu/1lbAu5bcGBnFZ+oh/Zuc1IeVGpTlpwb751RzZvbVxVhD+5yxlHqEaQ== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:6556:10b0:467:db8:e46d with SMTP id 5614622812f47-467e5f42304mr2239437b6e.34.1774054047603; Fri, 20 Mar 2026 17:47:27 -0700 (PDT) Date: Fri, 20 Mar 2026 17:47:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69bdea9f.050a0220.3bf4de.0036.GAE@google.com> Subject: [syzbot] [kernel?] WARNING in _cpu_up From: syzbot To: linux-kernel@vger.kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 2d1373e4246d Merge tag 'for-7.0-rc4-tag' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17794e72580000 kernel config: https://syzkaller.appspot.com/x/.config?x=64e78d99d9bf8b4c dashboard link: https://syzkaller.appspot.com/bug?extid=c38a53a2629d9fcae6e2 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2ccba0c603a6/disk-2d1373e4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6aaccd7990b8/vmlinux-2d1373e4.xz kernel image: https://storage.googleapis.com/syzbot-assets/78e3c8cc74dc/bzImage-2d1373e4.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c38a53a2629d9fcae6e2@syzkaller.appspotmail.com ------------[ cut here ]------------ cpuhp_invoke_callback_range(false, cpu, st, prev_state) WARNING: kernel/cpu.c:1035 at cpuhp_up_callbacks kernel/cpu.c:1035 [inline], CPU#0: syz.1.1795/14449 WARNING: kernel/cpu.c:1035 at _cpu_up+0x606/0x960 kernel/cpu.c:1674, CPU#0: syz.1.1795/14449 Modules linked in: CPU: 0 UID: 0 PID: 14449 Comm: syz.1.1795 Tainted: G U L syzkaller #0 PREEMPT(full) Tainted: [U]=USER, [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:cpuhp_up_callbacks kernel/cpu.c:1035 [inline] RIP: 0010:_cpu_up+0x606/0x960 kernel/cpu.c:1674 Code: ff 45 31 c0 48 89 da 89 ee 44 89 f9 e8 63 9b ff ff 31 ff 89 c3 89 c6 e8 d8 9a 40 00 85 db 0f 84 0a fe ff ff e8 1b a0 40 00 90 <0f> 0b 90 e9 fc fd ff ff e8 0d a0 40 00 89 ee bf 07 00 00 00 e8 b1 RSP: 0018:ffffc90004ed7ac0 EFLAGS: 00010283 RAX: 000000000000130b RBX: 00000000fffffff5 RCX: ffffc90005c83000 RDX: 0000000000080000 RSI: ffffffff81c77845 RDI: ffff888033a91e80 RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 R10: 00000000fffffff5 R11: 0000000000000000 R12: 0000000000000001 R13: 00000000fffffff4 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f10991046c0(0000) GS:ffff88812434a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f81a63ece20 CR3: 0000000032eee000 CR4: 00000000003526f0 Call Trace: cpu_up+0x1ba/0x230 kernel/cpu.c:1706 cpu_subsys_online+0x84/0x190 drivers/base/cpu.c:61 device_online+0x114/0x1c0 drivers/base/core.c:4225 online_store+0x145/0x180 drivers/base/core.c:2809 dev_attr_store+0x58/0x80 drivers/base/core.c:2437 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1070 fs/read_write.c:688 ksys_write+0x12a/0x250 fs/read_write.c:740 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f109819c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1099104028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1098415fa0 RCX: 00007f109819c799 RDX: 000000000000fdef RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f1098232c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1098416038 R14: 00007f1098415fa0 R15: 00007ffcdeebf638 --- 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