From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f72.google.com (mail-ot1-f72.google.com [209.85.210.72]) (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 EB3922609FD for ; Fri, 2 Oct 2026 05:32:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790919150; cv=none; b=a5+wu5JGEQG/KKZ6ox6dXawiCyVP6S46qrmdbHQQ6BL1245w6qSFavgjubQfwvYcJlEhr6IxYVwMqR9uK9fEM+o4DpF+2+k33/4Hscy9WxE55x7S/N3GLhlgBOLGIXb96Gcjd08/C4TMQmmfOtdDt4nWo1+OqsWo7U+MHWURg+0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790919150; c=relaxed/simple; bh=2pSnaHR0dLqqhKvGwe1MH9NgzMKRsufCm8qL9qOs+Ew=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=p+Fwi2gairuq+UcnB6k2dI/1OGhDtzj7mBULDNV9ueDUr12gFSkKbmeIbTj7u+v077ZfiKGU/1f4rDranBZddGsD8n4ey0xI92gaHLZfIvzF3ZsxXwbs7dFHwwkLNJndnyy9Ft4/UE5wF6f2vIdwbUBjrKxVs/TmkVRxMYiJO8c= 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=209.85.210.72 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-ot1-f72.google.com with SMTP id 46e09a7af769-81447a16061so4254557a34.3 for ; Thu, 01 Oct 2026 22:32:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790919148; x=1791523948; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=8fhLhuAHVPy61Xa+qU8I+dMZ+S9hoNa+YZFJU+sQNQE=; b=q+baiRVvJNAfi7Oar2Rr4cy4DhVlYSsjc+skBAh/M4sVb4VaXNAemBZF9YdDQOQo2p AWa8sMyPYQ7ETSEm1SXnBrz77YNcjZMaC9G0ScsGjGSYjP0bV6/WG9wEgU+S/igtWZD2 +3cBcoWSjQR/x3fQW5KdxSRiEd/lUMbm6EkTH+H6wmIirIeUpcHs8Opl46GC8rMRD052 i/rjvXaBHMOVPempjHZxQG9ixcoR3JIJuuEU6NOGoLqjSyhbsOABZGF3Rb2petu7R/T5 cLwmyDBVHOD/9AJ1IkznSzinX3pvRBdrhs1hbGeeoAe1YUxy9QzfKS50GoCVBBdcLZEj bkvA== X-Forwarded-Encrypted: i=1; AKwUvBy2LouJ3sPFFJAidql9rzhVm7xxuBFoX3H9CqqEvYnEo0ZpEVTsDv8zT/2vGuRF6pvRWqmlJtzDqHzizFQ=@vger.kernel.org X-Gm-Message-State: AFuF++mpPIm2XBBZf5l0bPFpVe4YwJYgDj6mDERcQFVhVcGOEld1/h0p DZb77Mh2FwGGExEoNoLLHi05TIJxLJnP7jjd6ArlhVH15jwn2SPKp5Sonw00KuF1/S8n1M3Q4Gr XbAN54Rxbhwbhn+zoRy8RzPN5tHKrX0EHW4PZIqb8IdtWkuOlBR01BmXH1F0= 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:c169:b0:4f4:724e:34d7 with SMTP id 5614622812f47-4f529c2b58cmr1178960b6e.28.1790919147837; Thu, 01 Oct 2026 22:32:27 -0700 (PDT) Date: Thu, 01 Oct 2026 22:32:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6abf41eb.b50370da.302ea9.000a.GAE@google.com> Subject: [syzbot] [bluetooth?] general protection fault in rfcomm_dev_shutdown From: syzbot To: linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, luiz.dentz@gmail.com, marcel@holtmann.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 551c722f4080 Merge tag 'rtc-7.3-fixes' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=155ee3f5580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9d4242cb1c54cdf7 dashboard link: https://syzkaller.appspot.com/bug?extid=4a807caf7680652d53b6 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3e4fb9949c4f/disk-551c722f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/fc47c1d4ab50/vmlinux-551c722f.xz kernel image: https://storage.googleapis.com/syzbot-assets/d29008ae09f9/bzImage-551c722f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4a807caf7680652d53b6@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047] CPU: 1 UID: 0 PID: 9467 Comm: syz.4.1031 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:rfcomm_dev_shutdown+0x48/0xb0 net/bluetooth/rfcomm/tty.c:131 Code: 8d b3 e0 03 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 26 32 48 f7 4d 8b 36 4d 8d 7e 40 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 09 32 48 f7 49 83 3f 00 74 16 e8 RSP: 0018:ffffc90006937bf0 EFLAGS: 00010212 RAX: 0000000000000008 RBX: ffff8880538c2000 RCX: 0000000000080000 RDX: ffffc9000f182000 RSI: 0000000000000325 RDI: 0000000000000326 RBP: 0000000000000400 R08: ffff8880538c2237 R09: 1ffff1100a718446 R10: dffffc0000000000 R11: ffffffff8aefbc10 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000040 FS: 00007f1514ff66c0(0000) GS:ffff888124dc8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2cbda1 CR3: 0000000038298000 CR4: 0000000000350ef0 Call Trace: tty_port_shutdown+0x1bf/0x220 drivers/tty/tty_port.c:372 tty_port_close+0x4e/0x150 drivers/tty/tty_port.c:705 tty_release+0x359/0x1670 drivers/tty/tty_io.c:1718 __fput+0x418/0xa50 fs/file_table.c:512 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1516d9e159 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:00007f1514ff6028 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f1517026090 RCX: 00007f1516d9e159 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000 RBP: 00007f1516e3506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1517026128 R14: 00007f1517026090 R15: 00007fff99ef4628 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:rfcomm_dev_shutdown+0x48/0xb0 net/bluetooth/rfcomm/tty.c:131 Code: 8d b3 e0 03 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 26 32 48 f7 4d 8b 36 4d 8d 7e 40 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 09 32 48 f7 49 83 3f 00 74 16 e8 RSP: 0018:ffffc90006937bf0 EFLAGS: 00010212 RAX: 0000000000000008 RBX: ffff8880538c2000 RCX: 0000000000080000 RDX: ffffc9000f182000 RSI: 0000000000000325 RDI: 0000000000000326 RBP: 0000000000000400 R08: ffff8880538c2237 R09: 1ffff1100a718446 R10: dffffc0000000000 R11: ffffffff8aefbc10 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000040 FS: 00007f1514ff66c0(0000) GS:ffff888124dc8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f508245e000 CR3: 0000000038298000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 8d b3 e0 03 00 00 lea 0x3e0(%rbx),%esi 6: 4c 89 f0 mov %r14,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 12: 74 08 je 0x1c 14: 4c 89 f7 mov %r14,%rdi 17: e8 26 32 48 f7 call 0xf7483242 1c: 4d 8b 36 mov (%r14),%r14 1f: 4d 8d 7e 40 lea 0x40(%r14),%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ff mov %r15,%rdi 34: e8 09 32 48 f7 call 0xf7483242 39: 49 83 3f 00 cmpq $0x0,(%r15) 3d: 74 16 je 0x55 3f: e8 .byte 0xe8 --- 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