No crash, but dmesg full with: [ 105.544050] ------------[ cut here ]------------ [ 105.544057] WARNING: CPU: 1 PID: 59 at /build/buildd/linux-lts-trusty-3.13.0/fs/proc/generic.c:522 remove_proc_entry+0x16d/0x180() [ 105.544059] remove_proc_entry: removing non-empty directory 'fs/nfsfs', leaking at least 'volumes' [ 105.544060] Modules linked in: des_generic rpcsec_gss_krb5 md4 snd_hrtimer pci_stub vboxpci(OX) vboxnetadp(OX) vboxnetflt(OX) vboxdrv(OX) dm_crypt rfcomm bnep bluetooth decnet nfsd nfsv4 nfs_acl auth_rpcgss nfs qmi_wwan uvcvideo usbnet videobuf2_core videodev mii qcserial usb_wwan nls_utf8 binfmt_misc videobuf2_vmalloc usbserial videobuf2_memops cdc_wdm lockd cifs sunrpc fscache arc4 iwldvm snd_hda_codec_hdmi snd_hda_codec_realtek mac80211 joydev snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device iwlwifi snd soundcore psmouse cfg80211 snd_page_alloc serio_raw fujitsu_laptop mei_me tpm_infineon mei lpc_ich rtsx_pci_ms ppdev mac_hid memstick parport_pc i2c_i801 coretemp lp parport hid_generic usbhid hid mmc_block rtsx_pci_sdmmc i915 sdhci_pci ahci sdhci libahci rtsx_pci drm_kms_helper drm e1000e ptp i2c_algo_bit video pps_core [ 105.544107] CPU: 1 PID: 59 Comm: kworker/u16:1 Tainted: G OX 3.13.0-39-generic #66~precise1-Ubuntu [ 105.544108] Hardware name: FUJITSU LIFEBOOK E781/FJNB222, BIOS Version 1.22 04/19/2013 [ 105.544111] Workqueue: netns cleanup_net [ 105.544112] 00000000 00000000 f2141e10 c1683110 c18974d4 f2141e40 c1059c54 c1897538 [ 105.544116] f2141e6c 0000003b c18974d4 0000020a c11deb6d c11deb6d f1741840 f06809e4 [ 105.544119] 00000005 f2141e58 c1059d13 00000009 f2141e50 c1897538 f2141e6c f2141e9c [ 105.544122] Call Trace: [ 105.544127] [] dump_stack+0x41/0x52 [ 105.544131] [] warn_slowpath_common+0x84/0xa0 [ 105.544133] [] ? remove_proc_entry+0x16d/0x180 [ 105.544135] [] ? remove_proc_entry+0x16d/0x180 [ 105.544136] [] warn_slowpath_fmt+0x33/0x40 [ 105.544138] [] remove_proc_entry+0x16d/0x180 [ 105.544146] [] nfs_fs_proc_net_exit+0x4b/0x60 [nfs] [ 105.544151] [] nfs_net_exit+0x10/0x20 [nfs] [ 105.544153] [] ops_exit_list.isra.1+0x2e/0x50 [ 105.544155] [] cleanup_net+0xd5/0x1e0 [ 105.544158] [] process_one_work+0x119/0x3c0 [ 105.544160] [] worker_thread+0xfa/0x370 [ 105.544162] [] ? manage_workers.isra.24+0x170/0x170 [ 105.544164] [] kthread+0x9b/0xb0 [ 105.544167] [] ret_from_kernel_thread+0x1b/0x28 [ 105.544169] [] ? flush_kthread_worker+0x90/0x90 [ 105.544171] ---[ end trace 7c197d278182ac8c ]--- [ 105.640016] ------------[ cut here ]------------ [ 105.640024] WARNING: CPU: 2 PID: 59 at /build/buildd/linux-lts-trusty-3.13.0/fs/proc/generic.c:511 remove_proc_entry+0x125/0x180() [ 105.640025] name 'fs/nfsfs' [ 105.640026] Modules linked in: des_generic rpcsec_gss_krb5 md4 snd_hrtimer pci_stub vboxpci(OX) vboxnetadp(OX) vboxnetflt(OX) vboxdrv(OX) dm_crypt rfcomm bnep bluetooth decnet nfsd nfsv4 nfs_acl auth_rpcgss nfs qmi_wwan uvcvideo usbnet videobuf2_core videodev mii qcserial usb_wwan nls_utf8 binfmt_misc videobuf2_vmalloc usbserial videobuf2_memops cdc_wdm lockd cifs sunrpc fscache arc4 iwldvm snd_hda_codec_hdmi snd_hda_codec_realtek mac80211 joydev snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device iwlwifi snd soundcore psmouse cfg80211 snd_page_alloc serio_raw fujitsu_laptop mei_me tpm_infineon mei lpc_ich rtsx_pci_ms ppdev mac_hid memstick parport_pc i2c_i801 coretemp lp parport hid_generic usbhid hid mmc_block rtsx_pci_sdmmc i915 sdhci_pci ahci sdhci libahci rtsx_pci drm_kms_helper drm e1000e ptp i2c_algo_bit video pps_core [ 105.640077] CPU: 2 PID: 59 Comm: kworker/u16:1 Tainted: G W OX 3.13.0-39-generic #66~precise1-Ubuntu [ 105.640078] Hardware name: FUJITSU LIFEBOOK E781/FJNB222, BIOS Version 1.22 04/19/2013 [ 105.640081] Workqueue: netns cleanup_net [ 105.640083] 00000000 00000000 f2141e10 c1683110 c18974d4 f2141e40 c1059c54 c1891883 [ 105.640086] f2141e6c 0000003b c18974d4 000001ff c11deb25 c11deb25 00000000 f6c21264 [ 105.640090] 00000005 f2141e58 c1059d13 00000009 f2141e50 c1891883 f2141e6c f2141e9c [ 105.640093] Call Trace: [ 105.640098] [] dump_stack+0x41/0x52 [ 105.640102] [] warn_slowpath_common+0x84/0xa0 [ 105.640105] [] ? remove_proc_entry+0x125/0x180 [ 105.640107] [] ? remove_proc_entry+0x125/0x180 [ 105.640110] [] warn_slowpath_fmt+0x33/0x40 [ 105.640112] [] remove_proc_entry+0x125/0x180 [ 105.640125] [] nfs_fs_proc_net_exit+0x4b/0x60 [nfs] [ 105.640133] [] nfs_net_exit+0x10/0x20 [nfs] [ 105.640136] [] ops_exit_list.isra.1+0x2e/0x50 [ 105.640139] [] cleanup_net+0xd5/0x1e0 [ 105.640142] [] ? pwq_activate_delayed_work+0x30/0x80 [ 105.640146] [] process_one_work+0x119/0x3c0 [ 105.640149] [] worker_thread+0xfa/0x370 [ 105.640152] [] ? manage_workers.isra.24+0x170/0x170 [ 105.640157] [] kthread+0x9b/0xb0 [ 105.640161] [] ret_from_kernel_thread+0x1b/0x28 [ 105.640164] [] ? flush_kthread_worker+0x90/0x90 [ 105.640166] ---[ end trace 7c197d278182ac8d ]--- [ 426.734594] ------------[ cut here ]------------ [ 426.734605] WARNING: CPU: 1 PID: 292 at /build/buildd/linux-lts-trusty-3.13.0/fs/proc/generic.c:511 remove_proc_entry+0x125/0x180() [ 426.734606] name 'fs/nfsfs' [ 426.734607] Modules linked in: des_generic rpcsec_gss_krb5 md4 snd_hrtimer pci_stub vboxpci(OX) vboxnetadp(OX) vboxnetflt(OX) vboxdrv(OX) dm_crypt rfcomm bnep bluetooth decnet nfsd nfsv4 nfs_acl auth_rpcgss nfs qmi_wwan uvcvideo usbnet videobuf2_core videodev mii qcserial usb_wwan nls_utf8 binfmt_misc videobuf2_vmalloc usbserial videobuf2_memops cdc_wdm lockd cifs sunrpc fscache arc4 iwldvm snd_hda_codec_hdmi snd_hda_codec_realtek mac80211 joydev snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device iwlwifi snd soundcore psmouse cfg80211 snd_page_alloc serio_raw fujitsu_laptop mei_me tpm_infineon mei lpc_ich rtsx_pci_ms ppdev mac_hid memstick parport_pc i2c_i801 coretemp lp parport hid_generic usbhid hid mmc_block rtsx_pci_sdmmc i915 sdhci_pci ahci sdhci libahci rtsx_pci drm_kms_helper drm e1000e ptp i2c_algo_bit video pps_core [ 426.734658] CPU: 1 PID: 292 Comm: kworker/u16:8 Tainted: G W OX 3.13.0-39-generic #66~precise1-Ubuntu [ 426.734659] Hardware name: FUJITSU LIFEBOOK E781/FJNB222, BIOS Version 1.22 04/19/2013 [ 426.734662] Workqueue: netns cleanup_net [ 426.734663] 00000000 00000000 f5dd9e10 c1683110 c18974d4 f5dd9e40 c1059c54 c1891883 [ 426.734667] f5dd9e6c 00000124 c18974d4 000001ff c11deb25 c11deb25 00000000 f6c21264 [ 426.734670] 00000005 f5dd9e58 c1059d13 00000009 f5dd9e50 c1891883 f5dd9e6c f5dd9e9c [ 426.734674] Call Trace: [ 426.734678] [] dump_stack+0x41/0x52 [ 426.734682] [] warn_slowpath_common+0x84/0xa0 [ 426.734683] [] ? remove_proc_entry+0x125/0x180 [ 426.734685] [] ? remove_proc_entry+0x125/0x180 [ 426.734687] [] warn_slowpath_fmt+0x33/0x40 [ 426.734689] [] remove_proc_entry+0x125/0x180 [ 426.734698] [] nfs_fs_proc_net_exit+0x4b/0x60 [nfs] [ 426.734703] [] nfs_net_exit+0x10/0x20 [nfs] [ 426.734705] [] ops_exit_list.isra.1+0x2e/0x50 [ 426.734707] [] cleanup_net+0xd5/0x1e0 [ 426.734710] [] process_one_work+0x119/0x3c0 [ 426.734713] [] ? apic_timer_interrupt+0x34/0x3c [ 426.734717] [] worker_thread+0xfa/0x370 [ 426.734720] [] ? manage_workers.isra.24+0x170/0x170 [ 426.734723] [] kthread+0x9b/0xb0 [ 426.734726] [] ret_from_kernel_thread+0x1b/0x28 [ 426.734729] [] ? flush_kthread_worker+0x90/0x90 [ 426.734731] ---[ end trace 7c197d278182ac8e ]--- [ 426.794212] ------------[ cut here ]------------ [ 426.794253] WARNING: CPU: 1 PID: 292 at /build/buildd/linux-lts-trusty-3.13.0/fs/proc/generic.c:511 remove_proc_entry+0x125/0x180() [ 426.794255] name 'fs/nfsfs' [ 426.794257] Modules linked in: des_generic rpcsec_gss_krb5 md4 snd_hrtimer pci_stub vboxpci(OX) vboxnetadp(OX) vboxnetflt(OX) vboxdrv(OX) dm_crypt rfcomm bnep bluetooth decnet nfsd nfsv4 nfs_acl auth_rpcgss nfs qmi_wwan uvcvideo usbnet videobuf2_core videodev mii qcserial usb_wwan nls_utf8 binfmt_misc videobuf2_vmalloc usbserial videobuf2_memops cdc_wdm lockd cifs sunrpc fscache arc4 iwldvm snd_hda_codec_hdmi snd_hda_codec_realtek mac80211 joydev snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device iwlwifi snd soundcore psmouse cfg80211 snd_page_alloc serio_raw fujitsu_laptop mei_me tpm_infineon mei lpc_ich rtsx_pci_ms ppdev mac_hid memstick parport_pc i2c_i801 coretemp lp parport hid_generic usbhid hid mmc_block rtsx_pci_sdmmc i915 sdhci_pci ahci sdhci libahci rtsx_pci drm_kms_helper drm e1000e ptp i2c_algo_bit video pps_core [ 426.794408] CPU: 1 PID: 292 Comm: kworker/u16:8 Tainted: G W OX 3.13.0-39-generic #66~precise1-Ubuntu [ 426.794410] Hardware name: FUJITSU LIFEBOOK E781/FJNB222, BIOS Version 1.22 04/19/2013 [ 426.794426] Workqueue: netns cleanup_net [ 426.794430] 00000000 00000000 f5dd9e10 c1683110 c18974d4 f5dd9e40 c1059c54 c1891883 [ 426.794435] f5dd9e6c 00000124 c18974d4 000001ff c11deb25 c11deb25 00000000 f6c21264 [ 426.794440] 00000005 f5dd9e58 c1059d13 00000009 f5dd9e50 c1891883 f5dd9e6c f5dd9e9c [ 426.794446] Call Trace: [ 426.794472] [] dump_stack+0x41/0x52 [ 426.794489] [] warn_slowpath_common+0x84/0xa0 [ 426.794492] [] ? remove_proc_entry+0x125/0x180 [ 426.794496] [] ? remove_proc_entry+0x125/0x180 [ 426.794498] [] warn_slowpath_fmt+0x33/0x40 [ 426.794501] [] remove_proc_entry+0x125/0x180 [ 426.794543] [] nfs_fs_proc_net_exit+0x4b/0x60 [nfs] [ 426.794555] [] nfs_net_exit+0x10/0x20 [nfs] [ 426.794560] [] ops_exit_list.isra.1+0x2e/0x50 [ 426.794563] [] cleanup_net+0xd5/0x1e0 [ 426.794572] [] ? pwq_activate_delayed_work+0x30/0x80 [ 426.794575] [] process_one_work+0x119/0x3c0 [ 426.794581] [] ? apic_timer_interrupt+0x34/0x3c [ 426.794585] [] worker_thread+0xfa/0x370 [ 426.794589] [] ? manage_workers.isra.24+0x170/0x170 [ 426.794594] [] kthread+0x9b/0xb0 [ 426.794601] [] ret_from_kernel_thread+0x1b/0x28 [ 426.794603] [] ? flush_kthread_worker+0x90/0x90 [ 426.794608] ---[ end trace 7c197d278182ac8f ]---