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 1D5223AFD01 for ; Wed, 17 Jun 2026 06:30:20 +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=1781677822; cv=none; b=lLjBjsEZtp7ASk2oWXT7G44C+Mj6QHd8Dpy3lhopa+Qdovr2tFWXMfhL8oJ8tkxj3RY9UUZ/Rd7JOQG5pwFiuEUGt4i90RTa+sHuGEWGfLstM+Dss7usa8C3XH5GsimwzAqDsc/MqMwNTwO71QAbcwKHXthV5YdMuWgnzwwki0U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781677822; c=relaxed/simple; bh=Zsk+Ve3CVPvQMuYioPGt6G10GOhmnoljUvMkAZFWYSU=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=XeOpJ0ECGIvQPfxhDbnQL4Z1B89lCq1WkG67uaBMcg0KKSPeMpzEcsAc9+tlIJuwYWOj/MX3z18v9auz8U0eO0CrzHlW5DOAXv39QwXBvNTf1qFZtWGrYfECEWjPUKN4RSXljcwh5shCO6wSP0Lmg3bwMrmzQHxGrTrilEDHmuw= 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 5614622812f47-486db2bf46eso7212068b6e.3 for ; Tue, 16 Jun 2026 23:30:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781677820; x=1782282620; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=yfm5IcI0ChgAuw5g0Ex87FXqhtkJfXVNcb6vMCo83WA=; b=MHvl67kFkZ2AYM4gCPRfNf55QMVyuqaOcn5ew0AFJcrbeph9jR2eZEc1OBppPaSu8j o4Gq/TlOgmYVmddZU4CLuBUmL4e89081bsjTGr/BqZGMarXLN46WfhuWHW0cOCi8sn0r /KJl6rMv4tGU6BsLjTDF7YMjxE8wYfSLcbxX9TgPdWRyAejvt8bKW3z65Ry9UZughG/F nO9jaGCsurrHukehfDBWhADYHxkoEJ5ljXi+R2QkRbqAM/7PxltmN7d38F4tlh4slDbP AqnJ6XE+J/wWEDp8e9P2iUC3HGFYEzNmJr1qe2C8ZB5eyWWK7L48sj2oHIU5S3B21nlw kTUA== X-Gm-Message-State: AOJu0YxFQgCkjhHNxkj1JahbTMMjxLiVwmdLocreOki5fs+Mw9XyUxfw bn+uDkMjyiurxlhlVjq4ITVB2arvCYsiYaa1Xf1pfqjPndhta14vcTarQC45Bec3Ii3s4B79Ous CpEJaU3HeXgK32lduyy6BG4b1r3F0BTV+TxPWswHc5WchyLymmCYqa/MtAZyx2Q== Precedence: bulk X-Mailing-List: driver-core@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:3445:b0:486:3537:2193 with SMTP id 5614622812f47-489428a47d0mr2640018b6e.11.1781677820114; Tue, 16 Jun 2026 23:30:20 -0700 (PDT) Date: Tue, 16 Jun 2026 23:30:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a323efc.b0403584.28d0ff.0008.GAE@google.com> Subject: [syzbot] [kernfs?] WARNING in __kernfs_new_node From: syzbot To: driver-core@lists.linux.dev, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tj@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: ec039126b7fa Add linux-next specific files for 20260611 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1733d9ee580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d0d1fa2afcbce17c dashboard link: https://syzkaller.appspot.com/bug?extid=ed4cf6ba7dd6164eb4ff compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/be809c32a471/disk-ec039126.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/13ea1053e3b5/vmlinux-ec039126.xz kernel image: https://storage.googleapis.com/syzbot-assets/1bcdab47ddc8/bzImage-ec039126.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ed4cf6ba7dd6164eb4ff@syzkaller.appspotmail.com ------------[ cut here ]------------ !atomic_read(&kn->count) WARNING: fs/kernfs/dir.c:560 at kernfs_get fs/kernfs/dir.c:560 [inline], CPU#0: kworker/0:2/820 WARNING: fs/kernfs/dir.c:560 at __kernfs_new_node+0x8b8/0xa70 fs/kernfs/dir.c:704, CPU#0: kworker/0:2/820 Modules linked in: CPU: 0 UID: 0 PID: 820 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: events request_firmware_work_func RIP: 0010:kernfs_get fs/kernfs/dir.c:560 [inline] RIP: 0010:__kernfs_new_node+0x8b8/0xa70 fs/kernfs/dir.c:704 Code: 08 e9 44 fb ff ff e8 77 2d 59 ff e8 e2 c6 27 ff e9 8f fa ff ff e8 68 2d 59 ff e8 a3 e0 c6 fe e9 26 fb ff ff e8 59 2d 59 ff 90 <0f> 0b 90 e9 d1 fc ff ff e8 db 55 d1 08 89 f9 80 e1 07 80 c1 03 38 RSP: 0018:ffffc90003bbf440 EFLAGS: 00010293 RAX: ffffffff826c9e47 RBX: 0000000000000000 RCX: ffff88802655dd00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003bbf598 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed10064cbc1f R12: ffff88803265e0f0 R13: 1ffff92000777e94 R14: dffffc0000000000 R15: ffff88805cc1b3c0 FS: 0000000000000000(0000) GS:ffff888125a6b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c272190 CR3: 000000003404a000 CR4: 00000000003526f0 Call Trace: kernfs_new_node fs/kernfs/dir.c:751 [inline] kernfs_create_dir_ns+0xfe/0x230 fs/kernfs/dir.c:1120 sysfs_create_dir_ns+0x12f/0x2a0 fs/sysfs/dir.c:59 create_dir lib/kobject.c:73 [inline] kobject_add_internal+0x631/0xd10 lib/kobject.c:240 kobject_add_varg lib/kobject.c:374 [inline] kobject_add+0x163/0x240 lib/kobject.c:426 class_dir_create_and_add drivers/base/core.c:3300 [inline] get_device_parent+0x31d/0x3a0 drivers/base/core.c:3351 device_add+0x2e1/0xb90 drivers/base/core.c:3681 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:86 [inline] fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:162 [inline] firmware_fallback_sysfs+0x2e4/0xa30 drivers/base/firmware_loader/fallback.c:238 _request_firmware+0x1052/0x1780 drivers/base/firmware_loader/main.c:898 request_firmware_work_func+0xba/0x2e0 drivers/base/firmware_loader/main.c:1162 process_one_work+0x98b/0x1630 kernel/workqueue.c:3326 process_scheduled_works kernel/workqueue.c:3409 [inline] worker_thread+0xb49/0x1140 kernel/workqueue.c:3490 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- 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