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[Bug 1395371] [NEW] nfs falls over during ftp connection since installing vsftpd

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Public bug reported:

I just installed vsftpd on my Ubuntu server.  The contents of syslog
suggests there is a problem. Previously no ftp-server software was
installed.

First some basic info:

$ cat /proc/version_signature:
Ubuntu 3.13.0-39.66-generic 3.13.11.8

$ lsb_release -rd
Description:	Ubuntu 14.04.1 LTS
Release:	14.04

$ apt-cache policy vsftpd
vsftpd:
  Installed: 3.0.2-1ubuntu2.14.04.1
  Candidate: 3.0.2-1ubuntu2.14.04.1
  Version table:
 *** 3.0.2-1ubuntu2.14.04.1 0
        500 http://nl.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     3.0.2-1ubuntu2 0
        500 http://nl.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

$ apt-cache policy nfs-common
nfs-common:
  Installed: 1:1.2.8-6ubuntu1.1
  Candidate: 1:1.2.8-6ubuntu1.1
  Version table:
 *** 1:1.2.8-6ubuntu1.1 0
        500 http://nl.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1:1.2.8-6ubuntu1 0
        500 http://nl.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages


When logging in with ftp from a remote computer onto this server as an
anonymous user, nfs seems to fall over causing this stacktrace:

[2014-11-22 21:13:35]  ------------[ cut here ]------------
[2014-11-22 21:13:35]  WARNING: CPU: 1 PID: 469 at /build/buildd/linux-3.13.0/fs/proc/generic.c:511 remove_proc_entry+0x139/0x1b0()
[2014-11-22 21:13:35]  name 'fs/nfsfs'
[2014-11-22 21:13:35]  Modules linked in: nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache snd_hda_codec_realtek snd_hda_codec_hdmi kvm_amd kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd serio_raw k10temp snd_hda_intel i2c_piix4 snd_hda_codec radeon snd_hwdep ttm snd_pcm drm_kms_helper snd_page_alloc drm snd_timer video i2c_algo_bit snd soundcore nct6775 hwmon_vid lp parport mac_hid pata_acpi raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor usb_storage hid_generic usbhid hid raid6_pq raid1 raid0 multipath alx linear mdio pata_atiixp ahci libahci
[2014-11-22 21:13:35]  CPU: 1 PID: 469 Comm: kworker/u8:0 Tainted: G        W     3.13.0-39-generic #66-Ubuntu
[2014-11-22 21:13:35]  Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./FM2A88X-ITX+, BIOS P2.10 01/17/2014
[2014-11-22 21:13:35]  Workqueue: netns cleanup_net
[2014-11-22 21:13:35]   0000000000000009 ffff88033286dc80 ffffffff8171ece7 ffff88033286dcc8
[2014-11-22 21:13:35]   ffff88033286dcb8 ffffffff8106773d 0000000000000000 0000000000000005
[2014-11-22 21:13:35]   ffffffffa05b08a8 ffff88041f018ab0 0000000000000100 ffff88033286dd18
[2014-11-22 21:13:35]  Call Trace:
[2014-11-22 21:13:35]   [<ffffffff8171ece7>] dump_stack+0x45/0x56
[2014-11-22 21:13:35]   [<ffffffff8106773d>] warn_slowpath_common+0x7d/0xa0
[2014-11-22 21:13:35]   [<ffffffff810677ac>] warn_slowpath_fmt+0x4c/0x50
[2014-11-22 21:13:35]   [<ffffffff81229889>] remove_proc_entry+0x139/0x1b0
[2014-11-22 21:13:35]   [<ffffffffa05904e2>] nfs_fs_proc_net_exit+0x62/0x70 [nfs]
[2014-11-22 21:13:35]   [<ffffffffa05965b2>] nfs_net_exit+0x12/0x20 [nfs]
[2014-11-22 21:13:35]   [<ffffffff8161b3a9>] ops_exit_list.isra.1+0x39/0x60
[2014-11-22 21:13:35]   [<ffffffff8161bc30>] cleanup_net+0x110/0x250
[2014-11-22 21:13:35]   [<ffffffff810839c2>] process_one_work+0x182/0x450
[2014-11-22 21:13:35]   [<ffffffff810847b1>] worker_thread+0x121/0x410
[2014-11-22 21:13:35]   [<ffffffff81084690>] ? rescuer_thread+0x430/0x430
[2014-11-22 21:13:35]   [<ffffffff8108b492>] kthread+0xd2/0xf0
[2014-11-22 21:13:35]   [<ffffffff8108b3c0>] ? kthread_create_on_node+0x1c0/0x1c0
[2014-11-22 21:13:35]   [<ffffffff8172f73c>] ret_from_fork+0x7c/0xb0
[2014-11-22 21:13:35]   [<ffffffff8108b3c0>] ? kthread_create_on_node+0x1c0/0x1c0
[2014-11-22 21:13:35]  ---[ end trace 2a658da59ed75c25 ]---

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: nfs-common stacktrace vsftpd

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https://bugs.launchpad.net/bugs/1395371

Title:
  nfs falls over during ftp connection since installing vsftpd

Status in “linux” package in Ubuntu:
  New

Bug description:
  I just installed vsftpd on my Ubuntu server.  The contents of syslog
  suggests there is a problem. Previously no ftp-server software was
  installed.

  First some basic info:

  $ cat /proc/version_signature:
  Ubuntu 3.13.0-39.66-generic 3.13.11.8

  $ lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  $ apt-cache policy vsftpd
  vsftpd:
    Installed: 3.0.2-1ubuntu2.14.04.1
    Candidate: 3.0.2-1ubuntu2.14.04.1
    Version table:
   *** 3.0.2-1ubuntu2.14.04.1 0
          500 http://nl.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       3.0.2-1ubuntu2 0
          500 http://nl.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

  $ apt-cache policy nfs-common
  nfs-common:
    Installed: 1:1.2.8-6ubuntu1.1
    Candidate: 1:1.2.8-6ubuntu1.1
    Version table:
   *** 1:1.2.8-6ubuntu1.1 0
          500 http://nl.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1:1.2.8-6ubuntu1 0
          500 http://nl.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages


  When logging in with ftp from a remote computer onto this server as an
  anonymous user, nfs seems to fall over causing this stacktrace:

  [2014-11-22 21:13:35]  ------------[ cut here ]------------
  [2014-11-22 21:13:35]  WARNING: CPU: 1 PID: 469 at /build/buildd/linux-3.13.0/fs/proc/generic.c:511 remove_proc_entry+0x139/0x1b0()
  [2014-11-22 21:13:35]  name 'fs/nfsfs'
  [2014-11-22 21:13:35]  Modules linked in: nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache snd_hda_codec_realtek snd_hda_codec_hdmi kvm_amd kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd serio_raw k10temp snd_hda_intel i2c_piix4 snd_hda_codec radeon snd_hwdep ttm snd_pcm drm_kms_helper snd_page_alloc drm snd_timer video i2c_algo_bit snd soundcore nct6775 hwmon_vid lp parport mac_hid pata_acpi raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor usb_storage hid_generic usbhid hid raid6_pq raid1 raid0 multipath alx linear mdio pata_atiixp ahci libahci
  [2014-11-22 21:13:35]  CPU: 1 PID: 469 Comm: kworker/u8:0 Tainted: G        W     3.13.0-39-generic #66-Ubuntu
  [2014-11-22 21:13:35]  Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./FM2A88X-ITX+, BIOS P2.10 01/17/2014
  [2014-11-22 21:13:35]  Workqueue: netns cleanup_net
  [2014-11-22 21:13:35]   0000000000000009 ffff88033286dc80 ffffffff8171ece7 ffff88033286dcc8
  [2014-11-22 21:13:35]   ffff88033286dcb8 ffffffff8106773d 0000000000000000 0000000000000005
  [2014-11-22 21:13:35]   ffffffffa05b08a8 ffff88041f018ab0 0000000000000100 ffff88033286dd18
  [2014-11-22 21:13:35]  Call Trace:
  [2014-11-22 21:13:35]   [<ffffffff8171ece7>] dump_stack+0x45/0x56
  [2014-11-22 21:13:35]   [<ffffffff8106773d>] warn_slowpath_common+0x7d/0xa0
  [2014-11-22 21:13:35]   [<ffffffff810677ac>] warn_slowpath_fmt+0x4c/0x50
  [2014-11-22 21:13:35]   [<ffffffff81229889>] remove_proc_entry+0x139/0x1b0
  [2014-11-22 21:13:35]   [<ffffffffa05904e2>] nfs_fs_proc_net_exit+0x62/0x70 [nfs]
  [2014-11-22 21:13:35]   [<ffffffffa05965b2>] nfs_net_exit+0x12/0x20 [nfs]
  [2014-11-22 21:13:35]   [<ffffffff8161b3a9>] ops_exit_list.isra.1+0x39/0x60
  [2014-11-22 21:13:35]   [<ffffffff8161bc30>] cleanup_net+0x110/0x250
  [2014-11-22 21:13:35]   [<ffffffff810839c2>] process_one_work+0x182/0x450
  [2014-11-22 21:13:35]   [<ffffffff810847b1>] worker_thread+0x121/0x410
  [2014-11-22 21:13:35]   [<ffffffff81084690>] ? rescuer_thread+0x430/0x430
  [2014-11-22 21:13:35]   [<ffffffff8108b492>] kthread+0xd2/0xf0
  [2014-11-22 21:13:35]   [<ffffffff8108b3c0>] ? kthread_create_on_node+0x1c0/0x1c0
  [2014-11-22 21:13:35]   [<ffffffff8172f73c>] ret_from_fork+0x7c/0xb0
  [2014-11-22 21:13:35]   [<ffffffff8108b3c0>] ? kthread_create_on_node+0x1c0/0x1c0
  [2014-11-22 21:13:35]  ---[ end trace 2a658da59ed75c25 ]---

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