From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752309AbeDHPiE (ORCPT ); Sun, 8 Apr 2018 11:38:04 -0400 Received: from mail-io0-f200.google.com ([209.85.223.200]:37779 "EHLO mail-io0-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751736AbeDHPiC (ORCPT ); Sun, 8 Apr 2018 11:38:02 -0400 X-Google-Smtp-Source: AIpwx48jVD2KsAZeoIXz4RXbCqXDlYEzEx+AcCwU+PiUSUAoSqC+cnusLwn/78XMHpgeMjMrsO3Gq2h5MhlDoGzOJZUyYTMIsYJq MIME-Version: 1.0 Date: Sun, 08 Apr 2018 08:38:01 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <001a113e8e9c15014705695813be@google.com> Subject: 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 Hello, syzbot hit the following crash on https://github.com/google/kmsan.git/master commit e2ab7e8abba47a2f2698216258e5d8727ae58717 (Fri Apr 6 16:24:31 2018 +0000) kmsan: temporarily disable visitAsmInstruction() to help syzbot syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=75e6e042c5bbf691fc82 Unfortunately, I don't have any reproducer for this crash yet. Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5784467448791040 Kernel config: https://syzkaller.appspot.com/x/.config?id=6627248707860932248 compiler: clang version 7.0.0 (trunk 329060) (llvm/trunk 329054) 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. See footer for details. If you forward the report, please keep this part and the footer. ================================================================== 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: 1 PID: 5017 Comm: kworker/u4:6 Not tainted 4.16.0+ #81 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 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 5017 Comm: kworker/u4:6 Tainted: G B 4.16.0+ #81 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 panic+0x39d/0x940 kernel/panic.c:183 kmsan_report+0x238/0x240 mm/kmsan/kmsan.c:1083 __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 Shutting down cpus with NMI Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@googlegroups.com. syzbot will keep track of this bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please reply to this email with: #syz fix: exact-commit-title To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body.