From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) (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 147E016C847 for ; Mon, 19 Aug 2024 13:42:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724074953; cv=none; b=tKWDHKf1WuEIvZwcT5L8ZzwT1GZlteiG/JMVhgrsP1/M1ULCIAX5wsTJFiz9vng+4sDLYi1KaDs3KFnPiYHCZWdSsbuBRBq1MNRyoo1itq3K1JrN+bgdy01VHJISn12+Q70CZ9Hq82Y7GTzioBPpOdICPUTF9ge7jsqzjce9nDw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724074953; c=relaxed/simple; bh=n055YP4UpwSx4MsWTuk5objkjsFP6bUCrLVCQsPaisA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=kC/CVV3AOdQpJFRTYRSKpwtXI9q8ZrqdeKI6LLzJoOVRnhtTpGAiNvX54Fnf8mHuB3g66/RC6XkIKVYWKReYZzLDwWdK0rzrExhJbm/bOAKpx6pgry6jBLIWvQ3mN2623W6ivlXekHUmUc2RKISfSMgj5GtULTfA0RgfxJ581aw= 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=209.85.166.69 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-io1-f69.google.com with SMTP id ca18e2360f4ac-81f897b8b56so314175939f.1 for ; Mon, 19 Aug 2024 06:42:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1724074951; x=1724679751; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=yb2ABfIEAQrnVUVakDimCyPOI0QvhxH1i+Tk0ohSf9w=; b=tGeCndVDM7sA2ExYmOPiJz1pHXQ1Jqiasm7Z34GQGlTmSOXgkOGyYR61V38ugF4RV5 sv+i1qv1yeOnfEUrf2fdIKl/xaeQIrS9orSAAjEFOST3apLgjD1YzBXRufvmasv28OXS grV1eTschJjIsZ9xI9XhcaFYyOiesmh9VedywflF/4wa6PkjO5vq9mmRLocAv9X+TtSP HRXMaLQd2v2FcFmY1VSPi2n9hreIq6pqwBJAHsujzXoWmR3iyGLBdT0r+t1siuha7NH0 4WyOVhxMoBw48HGyWWxiI934jxa9QuDUBKwyh4QHdvQOLk7hxK1n23hfs1gxlHKIuZS3 o5zQ== X-Forwarded-Encrypted: i=1; AJvYcCUwuJoXYeIiDCat6KA+zqOYV/03Ka7fffiKutwJAkFEdXXKMQ2xQT68FyF2/aEMzUG2GhUSvwSQDsvaI+qR0Z3MvSv72J0ELqwVGGhU X-Gm-Message-State: AOJu0YzpIQzHllecBd4qLzpzuJL2/eHMxn11/65hWs0LzSCVjkYHU8b8 9v7nreXqZ2F8IupE3dk8nyVDyDwEfUVzrT9FWbn53b0Xz2YPSH3ZWBfURv0GVWwaOFGht+1UjFS thv/e4oN7DSIfq31B/mJ/eNyp3C1J35lOpgW9WH0uvOoaNaITV+wg1cI= X-Google-Smtp-Source: AGHT+IE5rrDf70i/p1FbD9QFwTTP3OA7yraQQQy5xyKeucd1SSix0wNLxYR435ikpe3Pq6IV6eWLI3HP1US1yJpuHQhQ6ZySnb2J Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6638:8709:b0:4c2:31f5:3137 with SMTP id 8926c6da1cb9f-4cce0d85575mr518009173.0.1724074951314; Mon, 19 Aug 2024 06:42:31 -0700 (PDT) Date: Mon, 19 Aug 2024 06:42:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000000a1b9a0620097bad@google.com> Subject: [syzbot] [serial?] KMSAN: uninit-value in n_tty_receive_buf_closing (3) From: syzbot To: gregkh@linuxfoundation.org, jirislaby@kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 1fb918967b56 Merge tag 'for-6.11-rc3-tag' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10383409980000 kernel config: https://syzkaller.appspot.com/x/.config?x=836be0e882e376f7 dashboard link: https://syzkaller.appspot.com/bug?extid=dd514b5f0cf048aec256 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c4ce70611394/disk-1fb91896.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/014bed8fa88a/vmlinux-1fb91896.xz kernel image: https://storage.googleapis.com/syzbot-assets/f8aa322233dc/bzImage-1fb91896.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+dd514b5f0cf048aec256@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in n_tty_receive_char_closing drivers/tty/n_tty.c:1454 [inline] BUG: KMSAN: uninit-value in n_tty_receive_buf_closing+0x539/0xb40 drivers/tty/n_tty.c:1567 n_tty_receive_char_closing drivers/tty/n_tty.c:1454 [inline] n_tty_receive_buf_closing+0x539/0xb40 drivers/tty/n_tty.c:1567 __receive_buf drivers/tty/n_tty.c:1630 [inline] n_tty_receive_buf_common+0x196b/0x2490 drivers/tty/n_tty.c:1739 n_tty_receive_buf2+0x4c/0x60 drivers/tty/n_tty.c:1785 tty_ldisc_receive_buf+0xd0/0x290 drivers/tty/tty_buffer.c:387 tty_port_default_receive_buf+0xdf/0x190 drivers/tty/tty_port.c:37 receive_buf drivers/tty/tty_buffer.c:445 [inline] flush_to_ldisc+0x473/0xdb0 drivers/tty/tty_buffer.c:495 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312 worker_thread+0xea5/0x1520 kernel/workqueue.c:3390 kthread+0x3dd/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was created at: slab_post_alloc_hook mm/slub.c:3994 [inline] slab_alloc_node mm/slub.c:4037 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_noprof+0x661/0xf30 mm/slub.c:4170 kmalloc_noprof include/linux/slab.h:685 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:180 [inline] __tty_buffer_request_room+0x36e/0x6d0 drivers/tty/tty_buffer.c:273 __tty_insert_flip_string_flags+0x140/0x570 drivers/tty/tty_buffer.c:309 tty_insert_flip_char include/linux/tty_flip.h:77 [inline] uart_insert_char+0x39e/0xa10 drivers/tty/serial/serial_core.c:3568 serial8250_read_char+0x1a7/0x5d0 drivers/tty/serial/8250/8250_port.c:1743 serial8250_rx_chars drivers/tty/serial/8250/8250_port.c:1760 [inline] serial8250_handle_irq+0x77a/0xb80 drivers/tty/serial/8250/8250_port.c:1924 serial8250_default_handle_irq+0x120/0x2b0 drivers/tty/serial/8250/8250_port.c:1949 serial8250_interrupt+0xc5/0x360 drivers/tty/serial/8250/8250_core.c:86 __handle_irq_event_percpu+0x118/0xca0 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0xef/0x2c0 kernel/irq/handle.c:210 handle_edge_irq+0x340/0xfb0 kernel/irq/chip.c:831 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline] handle_irq arch/x86/kernel/irq.c:247 [inline] call_irq_handler arch/x86/kernel/irq.c:259 [inline] __common_interrupt+0x97/0x1f0 arch/x86/kernel/irq.c:285 common_interrupt+0x8f/0xa0 arch/x86/kernel/irq.c:278 asm_common_interrupt+0x2b/0x40 arch/x86/include/asm/idtentry.h:693 CPU: 1 UID: 0 PID: 3148 Comm: kworker/u8:16 Not tainted 6.11.0-rc3-syzkaller-00066-g1fb918967b56 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 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