From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f78.google.com (mail-oo1-f78.google.com [209.85.161.78]) (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 E79EF2E7BA0 for ; Mon, 15 Dec 2025 12:40:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765802426; cv=none; b=A3s5FNEqeyoU5CCgTpHm4iQ2OCPaKK5h4AVy2q6hWzIxPqXuZL7hkRhUy2FycMdGGA53ZO+hJVK2EbGrRrAzFZb6YcQuRZpuSaJGbIuZEZYcBNztpcuCysJUOVJ5/OAK4skUxBtEQi4JOoo6Zkdg5MKH3nYRKsYlDyw1yxhEjvs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765802426; c=relaxed/simple; bh=3CPdRh+DSPcWkL5B287+4dDfky9y9J9gWX+DML4syFI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=UKkUXZAvDx2qFj7Pc9p8qzWBQBPL6S27dBEqYyZlzoty7x35or3VZi39PabgqmPkNfTOmszel4VAK+KstuE2oksoV+Q6qXmwHZt5BeWOl8EcQ/nyy+9wTa3xrDhjvsJhf1xjowlyV8dE01ROrH8QUB6avKugTQ420CdouhPYxjk= 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=209.85.161.78 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-oo1-f78.google.com with SMTP id 006d021491bc7-656cc4098f3so5494467eaf.2 for ; Mon, 15 Dec 2025 04:40:24 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765802424; x=1766407224; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=721ApvIRAkzgHp/32/uXvf7MfR1jB3CQJmaTqNw/QVU=; b=M4hJPNPxV/fj2momxMAUs5DJtCPVBIcfD3YRf6zfu+Ya14XoBnVbT5txVPtU03U9BU woXx68iBLQcWs1+NDIurpR1A94lJHDtB7nGYAuhICw3i4iXXkg01U1hfHs+dSIV3kgVX ajnOcT35DeX8OXYf5/xLgAWe/kzHQnWiM/6g4wc5zlqkux1wTxvLsaG+wottd8dRKype LSydgmuFi2Q2u4ZUO//GfPQS27DkwQN5DELQpDB4g30J7g3uK03qUxYWuWhx/P7OMvDV /an1zy+51ZuWBhPKp6eS3iMCQLiVmmszg2tY84aBSi49lhkf0tJQx2RAxruwdR1566zP JFhg== X-Forwarded-Encrypted: i=1; AJvYcCXT5y3umjy518aRMSd3FCDcH3J2yYEA5X89UZXQGJQ1MoaqWVumSsQjlkF4f1JaI151J+1QdlAK3uEBsmY=@vger.kernel.org X-Gm-Message-State: AOJu0YyAl3v0uYh9s0OJc93zyOLIKvL3rcOlAheq4srfFQGZ1DFuJVVD v/foXnrOKafozsSJ0fsPV3jgolstf+ub/F1Z0mZC8foKx43t16bgRLcN+oFwsHitIyfL/y9he7j n891AiRbnaGdW8QfdRPYAHFjxrH9tWf8Rnqk2rX73CM0Aa6Vol6noFDeIEzs= X-Google-Smtp-Source: AGHT+IGOIpYbkTOe9NZHmJo3UxxNa14DJrFG1Q0iHldnoZFznb6K02avz6Ns/NNSI6BNiH6ULDsNARHxCImgRY6lQvp/U/PQAJxh Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:16a3:b0:65b:3857:b82d with SMTP id 006d021491bc7-65b451b3519mr4701277eaf.27.1765802424074; Mon, 15 Dec 2025 04:40:24 -0800 (PST) Date: Mon, 15 Dec 2025 04:40:24 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <694001b8.a70a0220.33cd7b.00fe.GAE@google.com> Subject: [syzbot] [net?] [nfc?] WARNING in nfc_dev_down 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: d358e5254674 Merge tag 'for-6.19/dm-changes' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13b2961a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f315601b98a91c0b dashboard link: https://syzkaller.appspot.com/bug?extid=4ef89409a235d804c6c2 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/def5abdae246/disk-d358e525.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/171af6e9cc68/vmlinux-d358e525.xz kernel image: https://storage.googleapis.com/syzbot-assets/2342dcd05182/bzImage-d358e525.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4ef89409a235d804c6c2@syzkaller.appspotmail.com ------------[ cut here ]------------ rtmutex deadlock detected WARNING: kernel/locking/rtmutex.c:1674 at 0x0, CPU#1: syz.4.2932/13586 Modules linked in: CPU: 1 UID: 0 PID: 13586 Comm: syz.4.2932 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:rt_mutex_handle_deadlock+0x21/0xb0 kernel/locking/rtmutex.c:1674 Code: 90 90 90 90 90 90 90 90 90 41 57 41 56 41 55 41 54 53 83 ff dd 0f 85 86 00 00 00 48 89 f7 e8 66 3b 01 00 48 8d 3d cf eb 08 04 <67> 48 0f b9 3a 4c 8d 3d 00 00 00 00 65 48 8b 1c 25 08 a0 b1 91 4c RSP: 0018:ffffc900040d78b0 EFLAGS: 00010286 RAX: 0000000080000000 RBX: ffffc900040d7940 RCX: 0000000000000000 RDX: 0000000000000006 RSI: ffffffff8ce093ac RDI: ffffffff8ede2bf0 RBP: ffffc900040d7a58 R08: ffffffff8edb0977 R09: 1ffffffff1db612e R10: dffffc0000000000 R11: fffffbfff1db612f R12: 1ffff9200081af24 R13: ffffffff8ad53b09 R14: ffff8880382f9098 R15: dffffc0000000000 FS: 00007f35de10c6c0(0000) GS:ffff888126e06000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558f47b588 CR3: 0000000063c72000 CR4: 00000000003526f0 Call Trace: __rt_mutex_slowlock kernel/locking/rtmutex.c:1734 [inline] __rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1760 [inline] rt_mutex_slowlock+0x666/0x6b0 kernel/locking/rtmutex.c:1800 __rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline] __mutex_lock_common kernel/locking/rtmutex_api.c:534 [inline] mutex_lock_nested+0x16a/0x1d0 kernel/locking/rtmutex_api.c:552 device_lock include/linux/device.h:895 [inline] nfc_dev_down+0x3b/0x290 net/nfc/core.c:143 nfc_rfkill_set_block+0x2d/0x100 net/nfc/core.c:179 rfkill_set_block+0x1e5/0x450 net/rfkill/core.c:346 rfkill_fop_write+0x44e/0x580 net/rfkill/core.c:1301 do_loop_readv_writev fs/read_write.c:850 [inline] vfs_writev+0x4bf/0x970 fs/read_write.c:1059 do_writev+0x153/0x2d0 fs/read_write.c:1103 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f35dfeef749 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:00007f35de10c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f35e0146180 RCX: 00007f35dfeef749 RDX: 0000000000000001 RSI: 0000200000000500 RDI: 0000000000000004 RBP: 00007f35dff73f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f35e0146218 R14: 00007f35e0146180 R15: 00007ffd7e110468 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 41 57 push %r15 b: 41 56 push %r14 d: 41 55 push %r13 f: 41 54 push %r12 11: 53 push %rbx 12: 83 ff dd cmp $0xffffffdd,%edi 15: 0f 85 86 00 00 00 jne 0xa1 1b: 48 89 f7 mov %rsi,%rdi 1e: e8 66 3b 01 00 call 0x13b89 23: 48 8d 3d cf eb 08 04 lea 0x408ebcf(%rip),%rdi # 0x408ebf9 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 4c 8d 3d 00 00 00 00 lea 0x0(%rip),%r15 # 0x36 36: 65 48 8b 1c 25 08 a0 mov %gs:0xffffffff91b1a008,%rbx 3d: b1 91 3f: 4c rex.WR --- 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