From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752107AbeDKFrD (ORCPT ); Wed, 11 Apr 2018 01:47:03 -0400 Received: from mail-it0-f70.google.com ([209.85.214.70]:40730 "EHLO mail-it0-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750865AbeDKFrC (ORCPT ); Wed, 11 Apr 2018 01:47:02 -0400 X-Google-Smtp-Source: AIpwx4/hPcVfoasE327BinMtpxokfcgUYyX3+nGPHkI9zDYAomXCuJIEjgeeRcOw9upR8hVdEAwf3Lxl7Zea8CVTGJyFmYa+yu4e MIME-Version: 1.0 Date: Tue, 10 Apr 2018 22:47:01 -0700 In-Reply-To: <001a113e8e9c15014705695813be@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000001127905698c2b00@google.com> Subject: Re: KMSAN: uninit-value in tipc_subscrb_rcv_cb From: syzbot To: davem@davemloft.net, jon.maloy@ericsson.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, tipc-discussion@lists.sourceforge.net, ying.xue@windriver.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found reproducer for the following crash on https://github.com/google/kmsan.git/master commit 35ff515e4bda2646f6c881d33951c306ea9c282a (Tue Apr 10 08:59:43 2018 +0000) Merge pull request #11 from parkerduckworth/readme syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=75e6e042c5bbf691fc82 So far this crash happened 3 times on https://github.com/google/kmsan.git/master. C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6676653019234304 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=5693411524870144 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5043527943716864 Kernel config: https://syzkaller.appspot.com/x/.config?id=6627248707860932248 compiler: clang version 7.0.0 (trunk 329391) IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+75e6e042c5bbf691fc82@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. ================================================================== BUG: KMSAN: uninit-value in htohl net/tipc/subscr.c:66 [inline] BUG: KMSAN: uninit-value in tipc_subscrb_rcv_cb+0x418/0xe80 net/tipc/subscr.c:339 CPU: 0 PID: 19 Comm: kworker/u4:1 Not tainted 4.16.0+ #83 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: tipc_rcv tipc_recv_work Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:53 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676 htohl net/tipc/subscr.c:66 [inline] tipc_subscrb_rcv_cb+0x418/0xe80 net/tipc/subscr.c:339 tipc_receive_from_sock+0x64c/0x800 net/tipc/server.c:271 tipc_recv_work+0xd8/0x1f0 net/tipc/server.c:618 process_one_work+0x12c6/0x1f60 kernel/workqueue.c:2113 worker_thread+0x113c/0x24f0 kernel/workqueue.c:2247 kthread+0x539/0x720 kernel/kthread.c:239 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:406 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline] kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314 kmem_cache_alloc+0xaab/0xb90 mm/slub.c:2756 tipc_receive_from_sock+0x15c/0x800 net/tipc/server.c:253 tipc_recv_work+0xd8/0x1f0 net/tipc/server.c:618 process_one_work+0x12c6/0x1f60 kernel/workqueue.c:2113 worker_thread+0x113c/0x24f0 kernel/workqueue.c:2247 kthread+0x539/0x720 kernel/kthread.c:239 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:406 ==================================================================