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=2.1 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SORTED_RECIPS,SPF_PASS, URIBL_BLOCKED autolearn=no 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 548C5C5CFE7 for ; Tue, 10 Jul 2018 18:41:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1732C208EB for ; Tue, 10 Jul 2018 18:41:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1732C208EB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390031AbeGJSlS (ORCPT ); Tue, 10 Jul 2018 14:41:18 -0400 Received: from mail-io0-f197.google.com ([209.85.223.197]:43469 "EHLO mail-io0-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389735AbeGJSlR (ORCPT ); Tue, 10 Jul 2018 14:41:17 -0400 Received: by mail-io0-f197.google.com with SMTP id n18-v6so19927500iog.10 for ; Tue, 10 Jul 2018 11:41:02 -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=IxLiiblRs9SIy/vRn13ReuWHjb8XfxuWMIHSLbxSAh4=; b=MFtTTQMOwHaOfYV7RZ13pRGmlnVTobXWLbWuEjotMobWy6R6I3StBwMa9hqPsef70A VXl9Mvm/8BmFx3s6aq9m5NXEVEaVPWBxZiQSgat78biw0RFNGP5hsVH6QezIdrYOu/g8 9EOOjoxXgC4MzBaudalD2yIInRcwLPPeIeSDCsUYS7gVa9uQhcaUknlPwq1Nd7ADurzj TR+YU58wSdwp4knbvB0euB0d7VxXfoCzTu99nuLF6wwDXnrqqr49s6UOLCXhT1LerMUo Z0HeIKumWeQPW4h050VY8heqM6UIBpVofDzhGGSGJ2ZBPel9ysofTcQJsrOmrmVfP9EP jmmA== X-Gm-Message-State: APt69E1UMpy93jEpMqmZV84OimmR/EBh730ZA4rQj5YBGjpz/DdqymNi zgF6KBdvpKSKwr+20mJk3RRbJ+RMygmNxEMlY8q35kr7PTA6 X-Google-Smtp-Source: AAOMgpeX6hqzV7wHvkPhjGSLq57vMNt2Q8yDktJurN54oxfIqLkMauXQc4WO4Ii39WTjo0+f7OYTXxRq8CA09a53FLgZEcxGcSTp MIME-Version: 1.0 X-Received: by 2002:a6b:4908:: with SMTP id u8-v6mr11170161iob.112.1531248061527; Tue, 10 Jul 2018 11:41:01 -0700 (PDT) Date: Tue, 10 Jul 2018 11:41:01 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000c541110570a978a4@google.com> Subject: KMSAN: uninit-value in p9_client_rpc From: syzbot To: davem@davemloft.net, ericvh@gmail.com, linux-kernel@vger.kernel.org, lucho@ionkov.net, netdev@vger.kernel.org, rminnich@sandia.gov, syzkaller-bugs@googlegroups.com, v9fs-developer@lists.sourceforge.net Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes 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: b64f7ec04e12 kmsan: implement kmsan_memmove_shadow() and k.. git tree: https://github.com/google/kmsan.git/master console output: https://syzkaller.appspot.com/x/log.txt?x=127179b2400000 kernel config: https://syzkaller.appspot.com/x/.config?x=93d57043084eee38 dashboard link: https://syzkaller.appspot.com/bug?extid=4de40388f584432bf004 compiler: clang version 7.0.0 (trunk 334104) 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+4de40388f584432bf004@syzkaller.appspotmail.com ================================================================== BUG: KMSAN: uninit-value in p9_client_rpc+0x194c/0x1dc0 net/9p/client.c:818 CPU: 0 PID: 14601 Comm: syz-executor4 Not tainted 4.18.0-rc4+ #24 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+0x185/0x1e0 lib/dump_stack.c:113 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:1092 __msan_warning_32+0x7d/0xe0 mm/kmsan/kmsan_instr.c:640 p9_client_rpc+0x194c/0x1dc0 net/9p/client.c:818 p9_client_attach+0x35b/0xc30 net/9p/client.c:1147 v9fs_session_init+0x24b9/0x2970 fs/9p/v9fs.c:449 v9fs_mount+0x107/0x11b0 fs/9p/vfs_super.c:135 mount_fs+0x29b/0x780 fs/super.c:1277 vfs_kern_mount+0x222/0x990 fs/namespace.c:1037 do_new_mount fs/namespace.c:2518 [inline] do_mount+0xd30/0x5310 fs/namespace.c:2848 ksys_mount+0x32e/0x3d0 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0x157/0x1c0 fs/namespace.c:3075 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455e29 Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2b81f7fc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2b81f806d4 RCX: 0000000000455e29 RDX: 0000000020000080 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 000000000072bea0 R08: 0000000020000380 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c05ca R14: 00000000004d0070 R15: 0000000000000000 Local variable description: ----ecode.i@p9_client_rpc Variable was created at: p9_client_rpc+0x183/0x1dc0 net/9p/client.c:750 p9_client_attach+0x35b/0xc30 net/9p/client.c:1147 ================================================================== --- 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#bug-status-tracking for how to communicate with syzbot.