From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo2-f7.google.com (mail-oo2-f7.google.com [74.125.231.135]) (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 BB1A1372046 for ; Wed, 2 Sep 2026 17:33:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.135 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788370418; cv=none; b=kVG2e+PH2SU169idZD/HY+XGevq1VrpgxC26Pc9co5IzJnWKq6ZsuFFWGcyrudCKwd8/onERb5ysYI8AMH/6ujCdu9gEPx43ZEdfawk4JOSWgw3VW0bG9PkPluGBBhdMubYjR67ZWdBdyRX+KxY2lKp02QQrSYXaJcrVJi9t6Ro= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788370418; c=relaxed/simple; bh=kLApcgrDHHoImg7rDx5AlYGkOwXeH6Lwo5nfizTtL/g=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=PI9V+UzqqOTZIwqgm0pfUoy0HQ8EBFZRO+qauPzB8Ms+SYbQRX0yX4qG1K/JKuMLGt70keUXOSMBGz/pptbdNW4rd2s4ACdwgYzKv745Y6nG4svj/imhmrhef22AblKCwz203W5R5z1dwRhS66ShtkdnzCKnz0F1MstiGrcmVps= 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=74.125.231.135 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-oo2-f7.google.com with SMTP id 006d021491bc7-6b137c364c5so313772eaf.1 for ; Wed, 02 Sep 2026 10:33:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788370415; x=1788975215; 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=E6iyjV1fsTZcltn61mxS6dNsDIgFSmZJkRfo9pUhTJc=; b=BduAJjvd0iJ5tAwpfKMftFwNlMNSn6jGKHfniPj0T6l+K4TZPDbAGtVIQ7savGXY80 r1IcsL+oQvGk6f4hGrcHUHZN9lfc7QnmLXeXJ5Iw3L6YZmodLEwORQK1G26E3k9w8idk OuTLv9n/Nvb0tk1/1trY/VTMt9ZUw18o5ekF2GC4M7IkkInz87Bb5l9TlZpL60qNft+/ oGLSqA5U0AeiJst80zZkekcr6AZmu90vTeBPAr60hzKmOdV5kNQHfkAYpZULYqDShigw WCZQHbTzRB72r9DQLwg4CIz7bqHZ2RtjvAg+E5jmGGeTI62+jMMEShOUVAD9hVCNMaXU oWZQ== X-Forwarded-Encrypted: i=1; AHgh+RpbKzABKB8ZrCe7YWc/uBhQXS7tm1Hc5kujOj4OuMVJn7lgxEhh9bKAotziVWa6aBJplUWpH44skxAsGjI=@vger.kernel.org X-Gm-Message-State: AFuF++lqhhOGk6irW0f5NkAjhELZv3p1laq7rI4raRHZ6qXFaZ622Ei7 66pUikAIlVvhRidD7goxqC2++UmWdYKT8APkZnAWMELWSnNEzyO5bEFVWah/aFj++xXnfEoGlKq bdxWTkp11bmwFrZVZipRPIPHJlzw7RsI2ni0eZrkeyyIqWejTBVChBPpgbEQ= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:161e:b0:6a0:f44b:1265 with SMTP id 006d021491bc7-6b47eac399fmr4904452eaf.4.1788370415542; Wed, 02 Sep 2026 10:33:35 -0700 (PDT) Date: Wed, 02 Sep 2026 10:33:35 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a985def.e163c37b.143a1.000a.GAE@google.com> Subject: [syzbot] [kernfs?] stack segment fault in kernfs_rename_ns (2) From: syzbot To: driver-core@lists.linux.dev, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, netdev@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: 594d90519502 af_unix: Unlink scc_entry in unix_del_edge(). git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=17d87e49580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3e8a402093abe6b2 dashboard link: https://syzkaller.appspot.com/bug?extid=80df2191816d8486bc51 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/672b53d154af/disk-594d9051.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6f5c69520cde/vmlinux-594d9051.xz kernel image: https://storage.googleapis.com/syzbot-assets/5f0629640136/bzImage-594d9051.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+80df2191816d8486bc51@syzkaller.appspotmail.com Oops: stack segment: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 18482 Comm: syz.4.3463 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:kernfs_rename_ns+0x3a/0x800 fs/kernfs/dir.c:1828 Code: ec 38 48 89 cb 48 89 54 24 10 49 89 f5 49 89 fe 49 bc 00 00 00 00 00 fc ff df e8 51 c6 51 ff 4d 8d 7e 30 4c 89 fd 48 c1 ed 03 <42> 80 7c 25 00 00 74 08 4c 89 ff e8 66 5f bf ff 49 83 3f 00 0f 84 RSP: 0018:ffffc900038ff930 EFLAGS: 00010206 RAX: ffffffff82753c3f RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc90003dc1000 RSI: 00000000000012b4 RDI: 00000000000012b5 RBP: 0000000000000006 R08: ffff8880261ebe00 R09: 0000000000000008 R10: 0000000000000007 R11: 0000000000000002 R12: dffffc0000000000 R13: ffff8880232a3870 R14: 0000000000000000 R15: 0000000000000030 FS: 00007facb7ebe6c0(0000) GS:ffff888124f58000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f12dd14a8f0 CR3: 00000000547f4000 CR4: 00000000003526f0 Call Trace: kobject_move+0x560/0x720 lib/kobject.c:569 device_move+0xe0/0x720 drivers/base/core.c:4689 hci_conn_del_sysfs+0xb8/0x1a0 net/bluetooth/hci_sysfs.c:75 hci_conn_cleanup net/bluetooth/hci_conn.c:170 [inline] hci_conn_del+0xc3d/0x1200 net/bluetooth/hci_conn.c:1308 hci_conn_hash_flush+0x189/0x260 net/bluetooth/hci_conn.c:2736 hci_dev_close_sync+0x7fc/0x10a0 net/bluetooth/hci_sync.c:5513 hci_dev_do_close net/bluetooth/hci_core.c:499 [inline] hci_dev_close+0x108/0x260 net/bluetooth/hci_core.c:524 sock_do_ioctl+0x101/0x320 net/socket.c:1300 sock_ioctl+0x57a/0x7e0 net/socket.c:1421 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7facb6f9e0d9 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:00007facb7ebe028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007facb7225fa0 RCX: 00007facb6f9e0d9 RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000004 RBP: 00007facb7035024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007facb7226038 R14: 00007facb7225fa0 R15: 00007ffed9e90828 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kernfs_rename_ns+0x3a/0x800 fs/kernfs/dir.c:1828 Code: ec 38 48 89 cb 48 89 54 24 10 49 89 f5 49 89 fe 49 bc 00 00 00 00 00 fc ff df e8 51 c6 51 ff 4d 8d 7e 30 4c 89 fd 48 c1 ed 03 <42> 80 7c 25 00 00 74 08 4c 89 ff e8 66 5f bf ff 49 83 3f 00 0f 84 RSP: 0018:ffffc900038ff930 EFLAGS: 00010206 RAX: ffffffff82753c3f RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc90003dc1000 RSI: 00000000000012b4 RDI: 00000000000012b5 RBP: 0000000000000006 R08: ffff8880261ebe00 R09: 0000000000000008 R10: 0000000000000007 R11: 0000000000000002 R12: dffffc0000000000 R13: ffff8880232a3870 R14: 0000000000000000 R15: 0000000000000030 FS: 00007facb7ebe6c0(0000) GS:ffff888125058000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc1ac18158 CR3: 00000000547f4000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: ec in (%dx),%al 1: 38 48 89 cmp %cl,-0x77(%rax) 4: cb lret 5: 48 89 54 24 10 mov %rdx,0x10(%rsp) a: 49 89 f5 mov %rsi,%r13 d: 49 89 fe mov %rdi,%r14 10: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12 17: fc ff df 1a: e8 51 c6 51 ff call 0xff51c670 1f: 4d 8d 7e 30 lea 0x30(%r14),%r15 23: 4c 89 fd mov %r15,%rbp 26: 48 c1 ed 03 shr $0x3,%rbp * 2a: 42 80 7c 25 00 00 cmpb $0x0,0x0(%rbp,%r12,1) <-- trapping instruction 30: 74 08 je 0x3a 32: 4c 89 ff mov %r15,%rdi 35: e8 66 5f bf ff call 0xffbf5fa0 3a: 49 83 3f 00 cmpq $0x0,(%r15) 3e: 0f .byte 0xf 3f: 84 .byte 0x84 --- 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