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[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

There is an additional patch that hit 3.17 upstream recently. It is
marked for stable but had not enough time to come through:

commit 2f3169fb18f4643ac9a6a097a6a6c71f0b2cef75
Author: Fabian Frederick <fabf@xxxxxxxxx>
Date:   Wed Sep 24 18:56:11 2014 +0200

    nfs: fix duplicate proc entries

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https://bugs.launchpad.net/bugs/1376245

Title:
  remove_proc_entry+0x139/0x1b0() -- name 'fs/nfsfs'

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 14.04 amd64

  ii  linux-image-3.13.0-37-generic
  3.13.0-37.64                                        amd64        Linux
  kernel image for version 3.13.0 on 64 bit x86 SMP

  sloeuillet@SLoeuillet-DE107:/sfr$ uname -a
  Linux SLoeuillet-DE107 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

  Today, I encountered 2 quite identical stack traces in my dmesg,
  related to nfs :

  
  [368973.412120] WARNING: CPU: 1 PID: 15607 at /build/buildd/linux-3.13.0/fs/proc/generic.c:511 remove_proc_entry+0x139/0x1b0()
  [368973.412122] name 'fs/nfsfs'
  [368973.412123] Modules linked in: cdc_acm nfsv3 rpcsec_gss_krb5 8021q garp stp mrp llc cuse bnep rfcomm bluetooth nfsv4 nfsd auth_rpcgss nfs_acl nfs lockd sunrpc binfmt_misc fscache hp_wmi sparse_keymap snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep snd_pcm radeon snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq sp5100_tco snd_seq_device serio_raw snd_timer ttm drm_kms_helper snd kvm edac_core soundcore drm edac_mce_amd k8temp i2c_algo_bit i2c_piix4 tpm_infineon shpchp wmi mac_hid parport_pc ppdev lp parport hid_generic usbhid hid tg3 psmouse ptp pps_core floppy ahci libahci
  [368973.412164] CPU: 1 PID: 15607 Comm: kworker/u8:1 Tainted: G        W     3.13.0-37-generic #64-Ubuntu
  [368973.412166] Hardware name: Hewlett-Packard HP Compaq dc5850 Small Form Factor/3029h, BIOS 786F6 v03.14 11/15/2011
  [368973.412171] Workqueue: netns cleanup_net
  [368973.412172]  0000000000000009 ffff88006a875c80 ffffffff8171ed09 ffff88006a875cc8
  [368973.412176]  ffff88006a875cb8 ffffffff8106773d 0000000000000000 0000000000000005
  [368973.412179]  ffffffffa05168a8 ffff88011b418b30 0000000000000100 ffff88006a875d18
  [368973.412182] Call Trace:
  [368973.412188]  [<ffffffff8171ed09>] dump_stack+0x45/0x56
  [368973.412192]  [<ffffffff8106773d>] warn_slowpath_common+0x7d/0xa0
  [368973.412195]  [<ffffffff810677ac>] warn_slowpath_fmt+0x4c/0x50
  [368973.412198]  [<ffffffff81229839>] remove_proc_entry+0x139/0x1b0
  [368973.412217]  [<ffffffffa04f64e2>] nfs_fs_proc_net_exit+0x62/0x70 [nfs]
  [368973.412225]  [<ffffffffa04fc5b2>] nfs_net_exit+0x12/0x20 [nfs]
  [368973.412228]  [<ffffffff8161b409>] ops_exit_list.isra.1+0x39/0x60
  [368973.412231]  [<ffffffff8161bc90>] cleanup_net+0x110/0x250
  [368973.412235]  [<ffffffff810839c2>] process_one_work+0x182/0x450
  [368973.412237]  [<ffffffff810847b1>] worker_thread+0x121/0x410
  [368973.412240]  [<ffffffff81084690>] ? rescuer_thread+0x430/0x430
  [368973.412243]  [<ffffffff8108b492>] kthread+0xd2/0xf0
  [368973.412246]  [<ffffffff8108b3c0>] ? kthread_create_on_node+0x1c0/0x1c0
  [368973.412249]  [<ffffffff8172f77c>] ret_from_fork+0x7c/0xb0
  [368973.412251]  [<ffffffff8108b3c0>] ? kthread_create_on_node+0x1c0/0x1c0
  [368973.412253] ---[ end trace bb78fe56a3dcb678 ]---

  [368973.448199] WARNING: CPU: 1 PID: 15607 at /build/buildd/linux-3.13.0/fs/proc/generic.c:511 remove_proc_entry+0x139/0x1b0()
  [368973.448201] name 'fs/nfsfs'
  [368973.448203] Modules linked in: cdc_acm nfsv3 rpcsec_gss_krb5 8021q garp stp mrp llc cuse bnep rfcomm bluetooth nfsv4 nfsd auth_rpcgss nfs_acl nfs lockd sunrpc binfmt_misc fscache hp_wmi sparse_keymap snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep snd_pcm radeon snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq sp5100_tco snd_seq_device serio_raw snd_timer ttm drm_kms_helper snd kvm edac_core soundcore drm edac_mce_amd k8temp i2c_algo_bit i2c_piix4 tpm_infineon shpchp wmi mac_hid parport_pc ppdev lp parport hid_generic usbhid hid tg3 psmouse ptp pps_core floppy ahci libahci
  [368973.448250] CPU: 1 PID: 15607 Comm: kworker/u8:1 Tainted: G        W     3.13.0-37-generic #64-Ubuntu
  [368973.448252] Hardware name: Hewlett-Packard HP Compaq dc5850 Small Form Factor/3029h, BIOS 786F6 v03.14 11/15/2011
  [368973.448257] Workqueue: netns cleanup_net
  [368973.448259]  0000000000000009 ffff88006a875c80 ffffffff8171ed09 ffff88006a875cc8
  [368973.448263]  ffff88006a875cb8 ffffffff8106773d 0000000000000000 0000000000000005
  [368973.448265]  ffffffffa05168a8 ffff88011b418b30 0000000000000100 ffff88006a875d18
  [368973.448268] Call Trace:
  [368973.448275]  [<ffffffff8171ed09>] dump_stack+0x45/0x56
  [368973.448279]  [<ffffffff8106773d>] warn_slowpath_common+0x7d/0xa0
  [368973.448283]  [<ffffffff810677ac>] warn_slowpath_fmt+0x4c/0x50
  [368973.448286]  [<ffffffff81229839>] remove_proc_entry+0x139/0x1b0
  [368973.448313]  [<ffffffffa04f64e2>] nfs_fs_proc_net_exit+0x62/0x70 [nfs]
  [368973.448322]  [<ffffffffa04fc5b2>] nfs_net_exit+0x12/0x20 [nfs]
  [368973.448325]  [<ffffffff8161b409>] ops_exit_list.isra.1+0x39/0x60
  [368973.448327]  [<ffffffff8161bc90>] cleanup_net+0x110/0x250
  [368973.448331]  [<ffffffff810839c2>] process_one_work+0x182/0x450
  [368973.448334]  [<ffffffff810847b1>] worker_thread+0x121/0x410
  [368973.448337]  [<ffffffff81084690>] ? rescuer_thread+0x430/0x430
  [368973.448341]  [<ffffffff8108b492>] kthread+0xd2/0xf0
  [368973.448343]  [<ffffffff8108b3c0>] ? kthread_create_on_node+0x1c0/0x1c0
  [368973.448346]  [<ffffffff8172f77c>] ret_from_fork+0x7c/0xb0
  [368973.448349]  [<ffffffff8108b3c0>] ? kthread_create_on_node+0x1c0/0x1c0
  [368973.448351] ---[ end trace bb78fe56a3dcb679 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-37-generic 3.13.0-37.64
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  Uname: Linux 3.13.0-37-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  sloeuillet   2501 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Oct  1 14:44:17 2014
  HibernationDevice: RESUME=UUID=f74ad7c2-cbec-4b9b-8b27-d1b624315ca8
  InstallationDate: Installed on 2013-09-16 (380 days ago)
  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Hewlett-Packard HP Compaq dc5850 Small Form Factor
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-37-generic root=/dev/sda1 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-37-generic N/A
   linux-backports-modules-3.13.0-37-generic  N/A
   linux-firmware                             1.127.7
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-28 (156 days ago)
  dmi.bios.date: 11/15/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 786F6 v03.14
  dmi.board.name: 3029h
  dmi.board.vendor: Hewlett-Packard
  dmi.chassis.type: 4
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr786F6v03.14:bd11/15/2011:svnHewlett-Packard:pnHPCompaqdc5850SmallFormFactor:pvr:rvnHewlett-Packard:rn3029h:rvr:cvnHewlett-Packard:ct4:cvr:
  dmi.product.name: HP Compaq dc5850 Small Form Factor
  dmi.sys.vendor: Hewlett-Packard

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