From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (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 C7D5627467D for ; Tue, 25 Nov 2025 11:35:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764070527; cv=none; b=UdkdZy4KPfcV2Z5nuqhahWOnzbeGixj4N1RXD7Zu2TcUKM81YB+Nu7QV4hRmQSc12GAYbtCD9o0NtIlmDMdyY3NcZzHRGLZC+PDQO9lUwdRmzYpyPGia+boTSKBcwei/VVdImExW+c+A9vGy5LWKGnKLkb38lS2EJ4QANhnfVUk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764070527; c=relaxed/simple; bh=N9e9kXKrkLY3hdJMVKAOJQ64uFmsSyeVEVDaOqkBz68=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=FGiD8B26wHmZh80UoyF2EMaKBys5cYP6u/4KbUeJ5b/L5eJ4SGkRlsDXMsHFPefmkghmZGuVZaMxk6+yIMh8ivEC8JMQzhUqc1XsLaoN5BLv6fXfVYsQCFNW8iaxPc6CYGaNq2f9HHdOS1+2ji7f9TF8raOylOBbx1bC3NyJvGg= 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=209.85.166.208 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-il1-f208.google.com with SMTP id e9e14a558f8ab-43376637642so50352595ab.2 for ; Tue, 25 Nov 2025 03:35:25 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1764070525; x=1764675325; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=ChoXgka1YWDsPKLbtTABFBVAbPQcMKaAZFHLUr1f2I8=; b=SnT+bnYgFwf8uHjkn9IHc4bbPEFIoS1VMdopwMZB/ERN8c1rP+VEfVj1EPzsOLoBfr Aj6QfZiGm9/OAoXBYBPgp5we0qVFFtfdI8n3/11XEDQeqet6fZ6hHvrmSTmfOllWuY8G xckvw7ldkeiTeZO9yoQJ5Y1VXtWnIi8q1nAeiGtRWzaoRaIdf747FJzTGKOBqCcr15FV pMyci27HY1meoNeKk7HlrAsobvOEOaKh2FwgKsw6W+GPAl5mv4Da7luwqdIWqeIpwU3w Euoef3gsDP0ACmoAXg5RwVzLXlcLa7z1vDR/ATYFi1nY8wdWqeq1OUcHWk2U0Cn0dncX S4iw== X-Forwarded-Encrypted: i=1; AJvYcCVvGFujwfcWlj2njf4RR+PcoU131aR+dPHBuuGDm+qNysAnl11EcrZGWNMKdDf1Fh6erRAX6a0=@vger.kernel.org X-Gm-Message-State: AOJu0Yz1T5tbROfCRtwvjxnDfDBDheYVqZurBpMR53CKpoaj0G4Gdhx4 Gakrnt85b9JkaVqCRe9cw4PNcfbL7bzoMQKYCPudA/Qm4UigQiD3qGmJJmVBB+2dMpY0qGn6FTh lNCUuCeYmCz0csdFyxH+RhPYP3T0Gmgm8pWMhU8Ja6AXcx13KLQCxFJVYc4g= X-Google-Smtp-Source: AGHT+IG/+ZXI4COkQeVB/sPLJPpDukEVsRV4EgCEQSp8GzW14yrp3MQgKhPKcvOMXnVRsAvqwXRkEe9bPBZrSiXNxBhWmj+Buyoz Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3810:b0:433:51fd:4cda with SMTP id e9e14a558f8ab-435b98c5d10mr118389165ab.25.1764070525069; Tue, 25 Nov 2025 03:35:25 -0800 (PST) Date: Tue, 25 Nov 2025 03:35:25 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6925947d.a70a0220.d98e3.00a6.GAE@google.com> Subject: [syzbot] [hams?] KMSAN: uninit-value in sixpack_receive_buf (4) From: syzbot To: ajk@comnets.uni-bremen.de, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, linux-hams@vger.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: fd95357fd8c6 Merge tag 'sched_ext-for-6.18-rc6-fixes-2' of.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14b20e92580000 kernel config: https://syzkaller.appspot.com/x/.config?x=61a9bf3cc5d17a01 dashboard link: https://syzkaller.appspot.com/bug?extid=ecdb8c9878a81eb21e54 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/68372e629a75/disk-fd95357f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d18e790887c9/vmlinux-fd95357f.xz kernel image: https://storage.googleapis.com/syzbot-assets/4eb563ad2c24/bzImage-fd95357f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ecdb8c9878a81eb21e54@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in sixpack_decode drivers/net/hamradio/6pack.c:891 [inline] BUG: KMSAN: uninit-value in sixpack_receive_buf+0xcf1/0x2d20 drivers/net/hamradio/6pack.c:413 sixpack_decode drivers/net/hamradio/6pack.c:891 [inline] sixpack_receive_buf+0xcf1/0x2d20 drivers/net/hamradio/6pack.c:413 tty_ldisc_receive_buf+0x1f7/0x2c0 drivers/tty/tty_buffer.c:391 tty_port_default_receive_buf+0xd7/0x1a0 drivers/tty/tty_port.c:37 receive_buf drivers/tty/tty_buffer.c:445 [inline] flush_to_ldisc+0x43e/0xe30 drivers/tty/tty_buffer.c:495 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xb91/0x1d80 kernel/workqueue.c:3346 worker_thread+0xedf/0x1590 kernel/workqueue.c:3427 kthread+0xd5c/0xf00 kernel/kthread.c:463 ret_from_fork+0x1f5/0x4c0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was created at: slab_post_alloc_hook mm/slub.c:4985 [inline] slab_alloc_node mm/slub.c:5288 [inline] __do_kmalloc_node mm/slub.c:5649 [inline] __kmalloc_noprof+0xabb/0x1b40 mm/slub.c:5662 kmalloc_noprof include/linux/slab.h:961 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:180 [inline] __tty_buffer_request_room+0x3d4/0x7a0 drivers/tty/tty_buffer.c:273 __tty_insert_flip_string_flags+0x157/0x6f0 drivers/tty/tty_buffer.c:309 tty_insert_flip_char include/linux/tty_flip.h:77 [inline] uart_insert_char+0x368/0x930 drivers/tty/serial/serial_core.c:3457 serial8250_read_char+0x1ba/0x670 drivers/tty/serial/8250/8250_port.c:1641 serial8250_rx_chars drivers/tty/serial/8250/8250_port.c:1658 [inline] serial8250_handle_irq+0x930/0x1110 drivers/tty/serial/8250/8250_port.c:1822 serial8250_default_handle_irq+0x116/0x370 drivers/tty/serial/8250/8250_port.c:1846 serial8250_interrupt+0xcb/0x430 drivers/tty/serial/8250/8250_core.c:82 __handle_irq_event_percpu+0x11e/0xf80 kernel/irq/handle.c:203 handle_irq_event_percpu kernel/irq/handle.c:240 [inline] handle_irq_event+0xe0/0x2a0 kernel/irq/handle.c:257 handle_edge_irq+0x2a9/0xb50 kernel/irq/chip.c:855 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline] handle_irq arch/x86/kernel/irq.c:254 [inline] call_irq_handler arch/x86/kernel/irq.c:-1 [inline] __common_interrupt+0x9d/0x180 arch/x86/kernel/irq.c:325 common_interrupt+0x4c/0xb0 arch/x86/kernel/irq.c:318 asm_common_interrupt+0x2b/0x40 arch/x86/include/asm/idtentry.h:688 CPU: 1 UID: 0 PID: 13878 Comm: kworker/u8:21 Tainted: G W syzkaller #0 PREEMPT(none) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: events_unbound flush_to_ldisc ===================================================== --- 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