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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,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 148CCC76197 for ; Fri, 19 Jul 2019 03:41:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ED6812184E for ; Fri, 19 Jul 2019 03:41:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726744AbfGSDfG (ORCPT ); Thu, 18 Jul 2019 23:35:06 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:33931 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726055AbfGSDfG (ORCPT ); Thu, 18 Jul 2019 23:35:06 -0400 Received: by mail-io1-f71.google.com with SMTP id u84so33248012iod.1 for ; Thu, 18 Jul 2019 20:35:06 -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=bqDgpOq4EZp5pgQlB1rL7ChcDj36IUT/kLHpPRLJieQ=; b=bsA+u/BxLrH1bH+MXRmN1ZNQqZeXS471zfcXHTb6fomUsPYHYJLSQdfKArn1kTU8+/ M4bZj0U69noLmQEDYWwLN+IxHjjhRTtP1bzzGRHxtJydWyMsR6tdbnw2m5EdjNJC9KRv /nmbqgIHnfU3jQUtXSo+fJ/27vlZWaNNpdhjFQ0bB7OEfgdVKpQ4mJZoH/cRMJBOGpZR NQn8l3iYCgtG+A0jXrJxianHqkHc2Ez7SikNJqp2HFZ9qE8lLLIVum2fGxdeuoCLKMJT 62fHxkHHZ2b4vJcAbPwIt2iGlEkwvC+pWPf7CYPXr8XGbFCaCXA0BHBW4rEGg0O6V7jq AnIw== X-Gm-Message-State: APjAAAVToaJUkdWuhBoIH13ZyGRZA0Gy8LWhAqYSLYe0Ld678rR1qNrJ EERz+xQoMVviKSIoIuA317buyfnOloTSQHqP7WbTuFRCTfpn X-Google-Smtp-Source: APXvYqwRkyj2r//80kfbXcBFnzJbW8M8j2NN6/I977/eCe4BJBA4YH6I/GXq6SnMoCoHJMbO9cbK6RbXVs5W2qAeMr04nh6sgMxB MIME-Version: 1.0 X-Received: by 2002:a5e:8b43:: with SMTP id z3mr44387251iom.287.1563507305597; Thu, 18 Jul 2019 20:35:05 -0700 (PDT) Date: Thu, 18 Jul 2019 20:35:05 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008dd6bb058e006938@google.com> Subject: WARNING in __mmdrop From: syzbot To: aarcange@redhat.com, akpm@linux-foundation.org, christian@brauner.io, ebiederm@xmission.com, elena.reshetova@intel.com, guro@fb.com, keescook@chromium.org, ldv@altlinux.org, linux-kernel@vger.kernel.org, luto@amacapital.net, mhocko@suse.com, mingo@kernel.org, namit@vmware.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk, wad@chromium.org 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: 6d21a41b Add linux-next specific files for 20190718 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=134920f0600000 kernel config: https://syzkaller.appspot.com/x/.config?x=3430a151e1452331 dashboard link: https://syzkaller.appspot.com/bug?extid=e58112d71f77113ddb7b compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10139e68600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+e58112d71f77113ddb7b@syzkaller.appspotmail.com WARNING: CPU: 0 PID: 9142 at kernel/fork.c:677 __mmdrop+0x26a/0x320 /kernel/fork.c:677 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 9142 Comm: syz-executor.0 Not tainted 5.2.0-next-20190718 #41 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+0x172/0x1f0 /lib/dump_stack.c:113 panic+0x2dc/0x755 /kernel/panic.c:219 __warn.cold+0x20/0x4c /kernel/panic.c:576 report_bug+0x263/0x2b0 /lib/bug.c:186 fixup_bug /arch/x86/kernel/traps.c:179 [inline] fixup_bug /arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 /arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 /arch/x86/kernel/traps.c:291 invalid_op+0x14/0x20 /arch/x86/entry/entry_64.S:1008 RIP: 0010:__mmdrop+0x26a/0x320 /kernel/fork.c:677 Code: 5f 5d c3 e8 18 7e 2f 00 4c 89 ef e8 60 d7 2b 00 eb d2 e8 09 7e 2f 00 0f 0b e8 02 7e 2f 00 0f 0b e9 fa fd ff ff e8 f6 7d 2f 00 <0f> 0b e9 2b fe ff ff e8 ea 7d 2f 00 4c 89 e7 e8 a2 f7 67 00 e9 85 RSP: 0018:ffff8880a176fac0 EFLAGS: 00010293 RAX: ffff888098f02600 RBX: ffff888098f02600 RCX: ffffffff81430bab RDX: 0000000000000000 RSI: ffffffff814306fa RDI: ffff888098f02a30 RBP: ffff8880a176fae8 R08: ffff888098f02600 R09: ffffed10148dd4ec R10: ffffed10148dd4eb R11: ffff8880a46ea75f R12: ffff8880a46ea700 R13: ffff8880a46ea828 R14: ffff8880a46eac50 R15: 0000000000000000 mmdrop /./include/linux/sched/mm.h:49 [inline] __mmput /kernel/fork.c:1074 [inline] mmput+0x3f0/0x4d0 /kernel/fork.c:1085 exit_mm /kernel/exit.c:547 [inline] do_exit+0x84e/0x2ea0 /kernel/exit.c:864 do_group_exit+0x135/0x360 /kernel/exit.c:981 get_signal+0x47c/0x2500 /kernel/signal.c:2728 do_signal+0x87/0x1700 /arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 /arch/x86/entry/common.c:159 prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline] syscall_return_slowpath /arch/x86/entry/common.c:274 [inline] do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459819 Code: Bad RIP value. RSP: 002b:00007f75afccbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000459819 RDX: 00000000200023c0 RSI: 000000004028af11 RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f75afccc6d4 R13: 00000000004c4722 R14: 00000000004d87d0 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds.. --- 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. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches