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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS 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 DEA38C28EBD for ; Sun, 9 Jun 2019 07:42:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AF4542070B for ; Sun, 9 Jun 2019 07:42:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727733AbfFIHmH (ORCPT ); Sun, 9 Jun 2019 03:42:07 -0400 Received: from mail-it1-f197.google.com ([209.85.166.197]:43777 "EHLO mail-it1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726480AbfFIHmH (ORCPT ); Sun, 9 Jun 2019 03:42:07 -0400 Received: by mail-it1-f197.google.com with SMTP id h18so5837546itl.8 for ; Sun, 09 Jun 2019 00:42:06 -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=zkrChJMHz/iadpuCPI3c7i7RrSxYQdDGlDejewpN83o=; b=mzlZQfwtB9kd6C3RuOiFILkXESW8b4t8kv5FBJtJ4xp9xaG0gN0Z/XPQSkgHaFcXgE 6+RPsIaHrNB9z9NmCltcnTzAfEXKYwU0aNddhJWfeEDogS3L9HWUqgnRGxfw8AZcz1gO ARSvQhw3unKRPmbcTU9RqYgBKk1JSqADQ8Ns0lydVaYof9KrWTyCCp8nqzTRon3Anrat B5+hU4LNEra4fztafYUdVLJqpsFRMztNVu+rJGHf6Y4UP+EOReq7T6fhFCEsTC1RX2Hw AeZZQQN6TVhet0y5ZyH8troTyKQkaLOCO0peRH03Wft3mRzY4J6WUtv5sVOVeO46R713 Iw4A== X-Gm-Message-State: APjAAAXyCyFFdrW/pUthmYGbotDzBVVr+tQ9yowHb3kWhe6K4waCm4Md Ma0V9ymqbMXzNaSvaSYL4jRUb7LvdZ9E1UehQCyD8YDKENcC X-Google-Smtp-Source: APXvYqybvuuFVipRvLLTFhZ4lVOnX8mIiOO72N8I0DGALWju5p/V0DSN6tV85qPghVYeKr15jBdezTmL23ylTE3mpE/fO4Yqv1XR MIME-Version: 1.0 X-Received: by 2002:a05:6638:6a3:: with SMTP id d3mr14703485jad.33.1560066126075; Sun, 09 Jun 2019 00:42:06 -0700 (PDT) Date: Sun, 09 Jun 2019 00:42:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000456245058adf33a4@google.com> Subject: BUG: Dentry still in use [unmount of tmpfs tmpfs] From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 79c3ba32 Merge tag 'drm-fixes-2019-06-07-1' of git://anong.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16eacf36a00000 kernel config: https://syzkaller.appspot.com/x/.config?x=60564cb52ab29d5b dashboard link: https://syzkaller.appspot.com/bug?extid=7008b8b8ba7df475fdc8 compiler: gcc (GCC) 9.0.0 20181231 (experimental) 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+7008b8b8ba7df475fdc8@syzkaller.appspotmail.com BUG: Dentry 00000000c5e232d4{i=15d04,n=/} still in use (2) [unmount of tmpfs tmpfs] WARNING: CPU: 0 PID: 22126 at fs/dcache.c:1529 umount_check fs/dcache.c:1520 [inline] WARNING: CPU: 0 PID: 22126 at fs/dcache.c:1529 umount_check.cold+0xe9/0x10a fs/dcache.c:1510 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 22126 Comm: syz-executor.5 Not tainted 5.2.0-rc3+ #16 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+0x2cb/0x744 kernel/panic.c:219 __warn.cold+0x20/0x4d 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:986 RIP: 0010:umount_check fs/dcache.c:1529 [inline] RIP: 0010:umount_check.cold+0xe9/0x10a fs/dcache.c:1510 Code: 89 ff e8 50 62 f0 ff 48 81 c3 68 06 00 00 45 89 e8 4c 89 e1 53 4d 8b 0f 4c 89 f2 4c 89 e6 48 c7 c7 c0 ff 75 87 e8 31 d4 a1 ff <0f> 0b 58 e9 bd 2a ff ff e8 20 62 f0 ff e9 29 ff ff ff 45 31 f6 e9 RSP: 0018:ffff8880659d7bf8 EFLAGS: 00010286 RAX: 0000000000000054 RBX: ffff8880934748a8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815ac976 RDI: ffffed100cb3af71 RBP: ffff8880659d7c28 R08: 0000000000000054 R09: ffffed1015d06011 R10: ffffed1015d06010 R11: ffff8880ae830087 R12: ffff88808fa10840 R13: 0000000000000002 R14: 0000000000015d04 R15: ffffffff88c21260 d_walk+0x194/0x950 fs/dcache.c:1264 do_one_tree+0x28/0x40 fs/dcache.c:1536 shrink_dcache_for_umount+0x72/0x170 fs/dcache.c:1552 generic_shutdown_super+0x6d/0x370 fs/super.c:443 kill_anon_super+0x3e/0x60 fs/super.c:1137 kill_litter_super+0x50/0x60 fs/super.c:1146 deactivate_locked_super+0x95/0x100 fs/super.c:331 deactivate_super fs/super.c:362 [inline] deactivate_super+0x1b2/0x1d0 fs/super.c:358 cleanup_mnt+0xbf/0x160 fs/namespace.c:1120 __cleanup_mnt+0x16/0x20 fs/namespace.c:1127 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:185 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:168 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x412f61 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fff7b2152c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000412f61 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 00000000ea5b01f8 R09: ffffffffffffffff R10: 00007fff7b2153a0 R11: 0000000000000293 R12: 0000000000760d58 R13: 0000000000077aaa R14: 0000000000077ad7 R15: 000000000075bf2c Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. 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