From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f197.google.com (mail-il1-f197.google.com [209.85.166.197]) (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 D6D73145B0C for ; Thu, 8 Aug 2024 06:34:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723098865; cv=none; b=jl33AjkLf0yonCJRiPXfirfjmlwDsp/ghY44BSI9wndg4PM4w2Qutxla73QaClHRTfmVNlrEbU81I6ASLc6u2kjYGC0dVeuYWJrxWJaKBkJowgnmmTRiQgxCe7hq+PQhlxLxEBSH8dXti2GXva6rnndjHwBpPdXJuTorUbO4aFQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723098865; c=relaxed/simple; bh=X0Ywof9eKRr0mCWWZtzPcFfnMDsOZ7Px9FQfHnQkg2w=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=G63nvdd6ov67QGafyWzwzvnyfV63HaW2VmDLxrNbuM0AHdbbrKAb00wmPhbb1MGvvUpk+55f5t2J7YyR7RJ+gmWs5gOvHTfvQjTnEtNQ88lXjo0B2QNBeAeNCitv4Y+bIee6TEqnosRFofoPjQHa6C+FB4wI4cCNTIBQA9PSVjY= 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=209.85.166.197 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-f197.google.com with SMTP id e9e14a558f8ab-37642e69d7eso8489695ab.3 for ; Wed, 07 Aug 2024 23:34:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1723098863; x=1723703663; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=cGCP6x6qpwug1AwJ39Kr2WZDwQ9R9XX2ZSoy2u5wdt0=; b=jEm03kFx88PLqLELZqAu98dSjT0y3UqXQZcbVHJQ3azJ2YQpP41zM6r2SWHeXY5kWm 4N726eN2oIkYAiNo0groaxUTfX4tUyYlN/emxeowKxSxilLcubKiDe6uosKIs+e1xq5j 5ktHnNM63JDsGiDq+IkCxv1tD54SuyWdSd/VlkWnCvDmkD+tEIHyawWEJPTjDLnErzEX zNIslwGiYp49tslCGrVXH0/U7wplAuJ8rrwTQyVBn1O8KSp9NS989NveLi9wXH5Gq9Mf NLVzWGuN3aTV8fzA4ZtQkH0bhNNJV6RPatx2bAa4pjy5qcRgXIcB0Lsn2hWx06BHs9cl ML3w== X-Forwarded-Encrypted: i=1; AJvYcCVM1OWsPOIQBJqHFnGUgPslIpFMvvjh8tBAst+I6yx6YNP2R3jhevd7qTGN5FMpFi2m7aLPQI/KOf3OtA0U4pUqFQGLWdK9QzikgkdQ X-Gm-Message-State: AOJu0Yyt7Y2FhAp0otGL2L8nUTGkL6/p5eWme1DDn+FVtAxN8jc1zWcK bL0K1X6a0XF3YeqdWSCIGyce6JzrV1ifTZmceUD9sU1ZWm9Y/GfXRONHPSLToLTqAGkl//q4Vbc 1rAL+S5N8yoFmt1p5OBknOioE6AFNlRpSgdtVjdNAB6S2vTiV/1TbRus= X-Google-Smtp-Source: AGHT+IEgtnjm28cVKYMmpwei9SVf9ut9VVrgjLyTXr1y/VqKia1zSODc6XrJopZUqNdHSESxjKSw0JYwLOaVgPChSPmMi1/lAw+n Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1c0d:b0:39a:ea7d:2a9a with SMTP id e9e14a558f8ab-39b5edaacadmr654145ab.6.1723098863086; Wed, 07 Aug 2024 23:34:23 -0700 (PDT) Date: Wed, 07 Aug 2024 23:34:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000a5c527061f263729@google.com> Subject: [syzbot] [ppp?] KMSAN: uninit-value in ppp_sync_receive (2) From: syzbot To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-ppp@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: defaf1a2113a Merge tag 'scsi-fixes' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1034ded9980000 kernel config: https://syzkaller.appspot.com/x/.config?x=9d6059ad10dde6fd dashboard link: https://syzkaller.appspot.com/bug?extid=d73ee3b9fbad2067c916 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d4b583db7f7f/disk-defaf1a2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a61e18e13b2d/vmlinux-defaf1a2.xz kernel image: https://storage.googleapis.com/syzbot-assets/386b01bc4565/bzImage-defaf1a2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d73ee3b9fbad2067c916@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in ppp_sync_input drivers/net/ppp/ppp_synctty.c:679 [inline] BUG: KMSAN: uninit-value in ppp_sync_receive+0x56a/0xf10 drivers/net/ppp/ppp_synctty.c:334 ppp_sync_input drivers/net/ppp/ppp_synctty.c:679 [inline] ppp_sync_receive+0x56a/0xf10 drivers/net/ppp/ppp_synctty.c:334 tty_ldisc_receive_buf+0x202/0x290 drivers/tty/tty_buffer.c:391 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:3560 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: 3154 Comm: kworker/u8:16 Not tainted 6.11.0-rc1-syzkaller-00293-gdefaf1a2113a #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