From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3F9D2C433E1 for ; Sat, 6 Jun 2020 06:53:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 28A12207D0 for ; Sat, 6 Jun 2020 06:53:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728582AbgFFGxU (ORCPT ); Sat, 6 Jun 2020 02:53:20 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:52803 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726384AbgFFGxS (ORCPT ); Sat, 6 Jun 2020 02:53:18 -0400 Received: by mail-io1-f70.google.com with SMTP id p8so7196275ios.19 for ; Fri, 05 Jun 2020 23:53:16 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=YHGzKlRr1x6wwe8+Xsd7XnVO9fRZA3zp66TEx6YNRM4=; b=CTWbANd4wdQh4HpwMUemlGwQPSaz3Fut9P9hRA9JVcP8PxE8tSBujs3JSB+TqudLw+ 2MNvvy4caoFRxs7hJmjaaPPHoAN5AHosSb5mIRfKYjVw4vatI8I6CI+ashyndlwX5weg vHH+nvuI/04hxUDvcrs83v8eyF7B/MF7pUQl9oxUcsKErn/y1WIrEVNaIyoI4XID0I25 TBSshnQeh2N0DdekMLYK0YvvVgFd7ce2eBhrwPdWceb91/93LODKfbP61xRyDVrYNeHj vmGHZC/c+F6BeHIYB9cC0vyLIr3t0RVLbD1aDT90+CzqsGrhD0q8/zek4RU49cacAoOP +XbA== X-Gm-Message-State: AOAM531N0ZeIKjmNM0o5EcpGaZzSFt67to7jH57zhXaP7MtOStTU+vIA pbOpEPD+km8ehiJQhKZ3pZxgQR16pPrbaALcoAJTqFU/vsph X-Google-Smtp-Source: ABdhPJy4/P7iEG0CqThevVgFExOxhIMriL6fmbiKTYRSFhBPA3ikqmu7n9qIyuu6SkDU5iXOEunr4/hu0K4ghkGSOdOC/h1Kyoqc MIME-Version: 1.0 X-Received: by 2002:a6b:8d44:: with SMTP id p65mr11887540iod.24.1591426395917; Fri, 05 Jun 2020 23:53:15 -0700 (PDT) Date: Fri, 05 Jun 2020 23:53:15 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000003d19705a764d5ee@google.com> Subject: KMSAN: uninit-value in slhc_compress (2) From: syzbot To: adobriyan@gmail.com, davem@davemloft.net, edumazet@google.com, glider@google.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: f0d5ec90 kmsan: apply __no_sanitize_memory to dotraplinkag.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=12a3dcca100000 kernel config: https://syzkaller.appspot.com/x/.config?x=86e4f8af239686c6 dashboard link: https://syzkaller.appspot.com/bug?extid=801c60509310ac8083dd compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+801c60509310ac8083dd@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in slhc_compress+0x2c5/0x2fb0 drivers/net/slip/slhc.c:251 CPU: 0 PID: 18018 Comm: syz-executor.3 Not tainted 5.7.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 slhc_compress+0x2c5/0x2fb0 drivers/net/slip/slhc.c:251 ppp_send_frame drivers/net/ppp/ppp_generic.c:1637 [inline] __ppp_xmit_process+0x1902/0x2970 drivers/net/ppp/ppp_generic.c:1495 ppp_xmit_process+0x147/0x2f0 drivers/net/ppp/ppp_generic.c:1516 ppp_write+0x6bb/0x790 drivers/net/ppp/ppp_generic.c:512 do_loop_readv_writev fs/read_write.c:718 [inline] do_iter_write+0xa0a/0xdc0 fs/read_write.c:1001 vfs_writev fs/read_write.c:1072 [inline] do_pwritev+0x487/0x7d0 fs/read_write.c:1169 __do_sys_pwritev fs/read_write.c:1216 [inline] __se_sys_pwritev+0xc6/0xe0 fs/read_write.c:1211 __x64_sys_pwritev+0x62/0x80 fs/read_write.c:1211 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ca69 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1e75341c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 RAX: ffffffffffffffda RBX: 00000000004facc0 RCX: 000000000045ca69 RDX: 1000000000000021 RSI: 00000000200003c0 RDI: 0000000000000006 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000879 R14: 00000000004cb58e R15: 00007f1e753426d4 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80 slab_alloc_node mm/slub.c:2802 [inline] __kmalloc_node_track_caller+0xb40/0x1200 mm/slub.c:4436 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x2fd/0xac0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1083 [inline] ppp_write+0x115/0x790 drivers/net/ppp/ppp_generic.c:500 do_loop_readv_writev fs/read_write.c:718 [inline] do_iter_write+0xa0a/0xdc0 fs/read_write.c:1001 vfs_writev fs/read_write.c:1072 [inline] do_pwritev+0x487/0x7d0 fs/read_write.c:1169 __do_sys_pwritev fs/read_write.c:1216 [inline] __se_sys_pwritev+0xc6/0xe0 fs/read_write.c:1211 __x64_sys_pwritev+0x62/0x80 fs/read_write.c:1211 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ===================================================== --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.