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[Tony Abbott <1376245@xxxxxxxxxxxxxxxxxx>]

Picked up these two panics from a few days ago in my logs so
unfortunately can't say what was happening at the time. Machine has
continued to be usable since. No NFS mounts but possibly related to NFS
exports on the box. I am running VMware Workstation on this box. Haven't
noticed it with older kernels, but then I wasn't looking for it. I have
tried exporting/unexporting NFS and mounting/unmounting those exports
but not able to reproduce so far.

** Attachment added: "kern.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1376245/+attachment/4238997/+files/kern.log

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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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