From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f79.google.com (mail-oa1-f79.google.com [209.85.160.79]) (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 4A66737F72D for ; Wed, 7 Jan 2026 15:44:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767800666; cv=none; b=LSiItl3VTc/EUxjJ4Nzm4S+VBGk0AOaO46ydxg+zK7O/yXRn00ci+lzlUSfMly/XGzkkdwXWIDy2XJ1NObPpfsNjx3a7A02U63SDTO3qt/4xJTO12D6huotN68NxAeCtodkWkRBaRFQUfK+vcp/9WZzUqlCG7DVkitwm/BQe+NE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767800666; c=relaxed/simple; bh=WO1564Ykb41trgvyAO2JS4X1tQNn2QdoLHhJ1Csvrao=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=fHDwQoDha4XiXe7P9/AKNmFe3nU+08Rnr98pkju7KCjH9XWd/QEtGK2lbTEL6V/v1WIWVMi3H0leVb8wuXorrq4U7vr/8g3bCHjLYCvGmm9EK/ivp1TbDNUkxd+YtIyFs0vKvVy+tHrYhehVz0PCZ1aHQ/ednIW15aDVQdEEK+Q= 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=209.85.160.79 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-oa1-f79.google.com with SMTP id 586e51a60fabf-3fda5f60035so3261182fac.0 for ; Wed, 07 Jan 2026 07:44:23 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767800662; x=1768405462; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=gcjd/LFVweR/hgLXJ78SKHVFtJprh20I5fqcQLT0jgk=; b=ve4EHxNDC7bBcnOD87kEL1W+jqaIxmENTpzZjrgvFGHzQldJngf3ki3whevAEbOS0P RtYHYGRG02wZ9MSyWruRMR2kaSfx8t+tisCtvFXHq6TIfI6EfmApzdwX3ZXFrBzICosN wubdYHAbHi7I+0SiXgS9brj9n758s9cu3Q+L87jxT7LSSaw35SPccdvgyUdWjE/22vIs VrlVp52kmwx20sU16MpgyS3VbylfYhtiHRy0JdPNQ4GqGa1LkGfP/VR7nPmZq7K59EkG /p4kqMtAhE8NK/cV/ksk39FnAe+5SG8YJN+4EwOolWZEJZ3ZT/v4+nd9NuZspWDhVDpt /2Ew== X-Forwarded-Encrypted: i=1; AJvYcCXB+GEeb/UM+twpAh6W17m9k67+sq1GB3km3pgS9a5IuCX1myaxh5c+mzFXwMxOl6B35+lMdiQ0G/6SU/A=@vger.kernel.org X-Gm-Message-State: AOJu0Yz+owgNnItxlxO7r/oIQxQnOzST0XOClgkbrCvpxIQRRKojCG2X 1N7hMyzARz2NSFfGZR/Lfrn+870qlJbM9t5ct/OdyX9HRTxiJQ2dhmUnfzA3Pj5HTGe2oW87ekL JMNPBZQWKP56X9upTTdTYnPgaEAxYEDmFtsRn48GRdb6jXofhCarhxF9xwms= X-Google-Smtp-Source: AGHT+IFdV4ZIGwks3eQ9jBrW++CfUWYS8g6wXep79BMiChW5OgoOxRJUVpiv3mo6mqDvcdLAi0lJo5genOdb9AFal/YzTfo8btN+ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:5292:b0:65c:fa23:2d00 with SMTP id 006d021491bc7-65f54ed1b57mr776379eaf.9.1767800662423; Wed, 07 Jan 2026 07:44:22 -0800 (PST) Date: Wed, 07 Jan 2026 07:44:22 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <695e7f56.050a0220.1c677c.036c.GAE@google.com> Subject: [syzbot] [net?] [nfc?] WARNING: locking bug in nci_close_device (3) From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, krzk@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: dbf8fe85a16a Merge tag 'net-6.19-rc4' of git://git.kernel... git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=109dffb4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a94030c847137a18 dashboard link: https://syzkaller.appspot.com/bug?extid=f9c5fd1a0874f9069dce 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/9dc5ccb3a40b/disk-dbf8fe85.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7b9d75d2c0c2/vmlinux-dbf8fe85.xz kernel image: https://storage.googleapis.com/syzbot-assets/37f71f0365c9/bzImage-dbf8fe85.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f9c5fd1a0874f9069dce@syzkaller.appspotmail.com Bluetooth: hci1: Opcode 0x0c1a failed: -4 Bluetooth: hci1: Error when powering off device on rfkill (-4) Bluetooth: hci2: Opcode 0x0c1a failed: -4 Bluetooth: hci2: Error when powering off device on rfkill (-4) ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: kernel/locking/lockdep.c:238 at hlock_class kernel/locking/lockdep.c:238 [inline], CPU#1: syz.6.5778/26216 WARNING: kernel/locking/lockdep.c:238 at check_wait_context kernel/locking/lockdep.c:4854 [inline], CPU#1: syz.6.5778/26216 WARNING: kernel/locking/lockdep.c:238 at __lock_acquire+0x39e/0x2cf0 kernel/locking/lockdep.c:5187, CPU#1: syz.6.5778/26216 Modules linked in: CPU: 1 UID: 0 PID: 26216 Comm: syz.6.5778 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:hlock_class kernel/locking/lockdep.c:238 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4854 [inline] RIP: 0010:__lock_acquire+0x3a5/0x2cf0 kernel/locking/lockdep.c:5187 Code: 17 00 4c 8b 74 24 08 75 27 90 e8 e6 94 ec 02 85 c0 74 1c 83 3d 2f 5d e4 0d 00 75 13 48 8d 3d 42 72 e7 0d 48 c7 c6 3a 0c 87 8d <67> 48 0f b9 3a 90 31 c0 0f b6 98 c4 00 00 00 41 8b 45 20 25 ff 1f RSP: 0018:ffffc9000c037680 EFLAGS: 00010046 RAX: 0000000000000001 RBX: 0000000000040000 RCX: 0000000000080000 RDX: ffffc90004e52000 RSI: ffffffff8d870c3a RDI: ffffffff8f8567c0 RBP: 0000000000000003 R08: ffffffff8f8252a3 R09: 1ffffffff1f04a54 R10: dffffc0000000000 R11: fffffbfff1f04a55 R12: 00000000000011bb R13: ffff888052a6aa28 R14: ffff888052a69e80 R15: ffff888052a6a9b0 FS: 00007f462b1636c0(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000028c0 CR3: 00000000765dc000 CR4: 00000000003526f0 Call Trace: lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868 touch_wq_lockdep_map+0xcb/0x180 kernel/workqueue.c:3940 __flush_workqueue+0x121/0x14b0 kernel/workqueue.c:3982 nci_close_device+0x2e5/0x610 net/nfc/nci/core.c:567 nci_dev_down+0x3b/0x50 net/nfc/nci/core.c:639 nfc_dev_down+0x152/0x290 net/nfc/core.c:161 nfc_rfkill_set_block+0x2d/0x100 net/nfc/core.c:179 rfkill_set_block+0x1d2/0x440 net/rfkill/core.c:346 rfkill_fop_write+0x44b/0x570 net/rfkill/core.c:1301 vfs_write+0x27e/0xb30 fs/read_write.c:684 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f462a38f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f462b163038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f462a5e6090 RCX: 00007f462a38f749 RDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000006 RBP: 00007f462a413f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f462a5e6128 R14: 00007f462a5e6090 R15: 00007ffea1921d88 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 00 4c 8b 74 add %cl,0x74(%rbx,%rcx,4) 4: 24 08 and $0x8,%al 6: 75 27 jne 0x2f 8: 90 nop 9: e8 e6 94 ec 02 call 0x2ec94f4 e: 85 c0 test %eax,%eax 10: 74 1c je 0x2e 12: 83 3d 2f 5d e4 0d 00 cmpl $0x0,0xde45d2f(%rip) # 0xde45d48 19: 75 13 jne 0x2e 1b: 48 8d 3d 42 72 e7 0d lea 0xde77242(%rip),%rdi # 0xde77264 22: 48 c7 c6 3a 0c 87 8d mov $0xffffffff8d870c3a,%rsi * 29: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2e: 90 nop 2f: 31 c0 xor %eax,%eax 31: 0f b6 98 c4 00 00 00 movzbl 0xc4(%rax),%ebx 38: 41 8b 45 20 mov 0x20(%r13),%eax 3c: 25 .byte 0x25 3d: ff 1f lcall *(%rdi) --- 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