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=-5.4 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 00B07C48BE4 for ; Sun, 23 Jun 2019 12:53:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D6DFA20820 for ; Sun, 23 Jun 2019 12:53:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726589AbfFWMvH (ORCPT ); Sun, 23 Jun 2019 08:51:07 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:47269 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726086AbfFWMvG (ORCPT ); Sun, 23 Jun 2019 08:51:06 -0400 Received: by mail-io1-f72.google.com with SMTP id r27so18184958iob.14 for ; Sun, 23 Jun 2019 05:51:06 -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=kXaTpUMB141Sio/v1vYpi203tFotQH/1Wy9zkwXn66s=; b=Fb99xDeQHBjHFUySHhLB9GQDEstxzx8VHYDC4yshslSZkF7uBsQCMSm7xHlJT2bQTj +L22wK7cEpsqm0OgDlODCe4kIGIDhFAESBpIaMStDmKxdNvssConJXrV8X5S0pVDQbfo OUWXUK6JS0XJVRXn/4j+kltm4dwdSu4AafGKAAq8yMlLw8AY0O52qEHjUDI6PORQib1q y3/uzodDu5kYm+gFRqx+TMpzsD9b+HLZDqgcIWBsmcmZHwaeqLGp5VtftSfg+pUZSbcI SmUjxK/thZMURQSg2BOSsaKHwHXASz2QCAd2w4tNzR8MWJTu1tR3Yn2Cq+BALX4DjIvd KzkA== X-Gm-Message-State: APjAAAUcW5lejaUXKpTOi3f59ReU+6rCSWKY876LJNYPpHzOw/qvom4a e9g2cWMmpacPCT2g3VWam+HZkPU6irGcRlQ5krwU4c8iqP86 X-Google-Smtp-Source: APXvYqzcFA+EMFZhoK5ooQwachkSlc25xxKAQ9TDLwSYySrT2apNKBVdu5TzHbNy0NWZzRwZUBBo1Dm6J+Vy9B4JPNJQ88jGhvuG MIME-Version: 1.0 X-Received: by 2002:a02:c6b8:: with SMTP id o24mr78442599jan.80.1561294265890; Sun, 23 Jun 2019 05:51:05 -0700 (PDT) Date: Sun, 23 Jun 2019 05:51:05 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000001bbe63058bfd26d9@google.com> Subject: WARNING in kernfs_remove_by_name_ns From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tj@kernel.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: abf02e29 Merge tag 'pm-5.2-rc6' of git://git.kernel.org/pu.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17a6c806a00000 kernel config: https://syzkaller.appspot.com/x/.config?x=e5c77f8090a3b96b dashboard link: https://syzkaller.appspot.com/bug?extid=b76f1b62f3f98711bd93 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+b76f1b62f3f98711bd93@syzkaller.appspotmail.com ------------[ cut here ]------------ kernfs: can not remove 'nr_tags', no directory WARNING: CPU: 0 PID: 19627 at fs/kernfs/dir.c:1503 kernfs_remove_by_name_ns+0x9f/0xb0 fs/kernfs/dir.c:1503 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 19627 Comm: syz-executor.1 Not tainted 5.2.0-rc5+ #31 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:kernfs_remove_by_name_ns+0x9f/0xb0 fs/kernfs/dir.c:1503 Code: 99 ff 48 c7 c7 60 22 c9 88 41 bc fe ff ff ff e8 a7 c4 44 05 eb d7 e8 f0 4e 99 ff 4c 89 ee 48 c7 c7 80 c8 78 87 e8 ff 87 6b ff <0f> 0b 41 bc fe ff ff ff eb b9 0f 1f 80 00 00 00 00 55 48 89 e5 41 RSP: 0018:ffff888058aaf798 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffffffff88f18128 RCX: 0000000000000000 RDX: 000000000001e0a4 RSI: ffffffff815ad926 RDI: ffffed100b155ee5 RBP: ffff888058aaf7b0 R08: ffff88804eb8a240 R09: ffffed1015d060a1 R10: ffffed1015d060a0 R11: ffff8880ae830507 R12: 0000000000000000 R13: ffffffff87a35540 R14: 0000000000000000 R15: ffffffff87a35480 kernfs_remove_by_name include/linux/kernfs.h:567 [inline] remove_files.isra.0+0x7b/0x190 fs/sysfs/group.c:27 sysfs_remove_group+0xb6/0x1b0 fs/sysfs/group.c:264 sysfs_remove_groups fs/sysfs/group.c:288 [inline] sysfs_remove_groups+0x61/0xb0 fs/sysfs/group.c:280 kobject_del+0x9c/0x170 lib/kobject.c:619 blk_mq_unregister_hctx.part.0+0x126/0x170 block/blk-mq-sysfs.c:243 blk_mq_unregister_hctx block/blk-mq-sysfs.c:237 [inline] blk_mq_sysfs_unregister+0x16b/0x200 block/blk-mq-sysfs.c:373 __blk_mq_update_nr_hw_queues block/blk-mq.c:3286 [inline] blk_mq_update_nr_hw_queues+0x4f9/0xd30 block/blk-mq.c:3321 nbd_start_device+0x156/0xac0 drivers/block/nbd.c:1166 nbd_start_device_ioctl drivers/block/nbd.c:1207 [inline] __nbd_ioctl drivers/block/nbd.c:1278 [inline] nbd_ioctl+0x53f/0xbd0 drivers/block/nbd.c:1318 __blkdev_driver_ioctl block/ioctl.c:304 [inline] blkdev_ioctl+0xece/0x1c10 block/ioctl.c:606 block_ioctl+0xee/0x130 fs/block_dev.c:1930 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4592c9 Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9aba72cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00000000004592c9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9aba72d6d4 R13: 00000000004c2a81 R14: 00000000004d5b10 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. 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