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Bug#763192: marked as done (NFSv4 server recovery not supported in container)

Your message dated Fri, 23 Apr 2021 20:23:40 +0200
with message-id <YIMQrIiOh5NJuesV@eldamar.lan>
and subject line Re: Bug#763192: [LXC] [nfsd] kernel crash when running nfs-kernel-server in one LXC Container
has caused the Debian Bug report #763192,
regarding NFSv4 server recovery not supported in container
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
763192: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=763192
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: nfs-kernel-server
Version: 1:1.2.6-4
Severity: serious

Hi dear maintainer,
I have on problem on nfs-kernel-server (Debian Wheezy) when installed in one LXC container (debian Wheezy) on one Debian Jessie host with very recent kernel (3.16-2-amd64) 

The configuration is hosted on one IBM IBM eServer x3400 (2 CPU 4 cores)

- config 1:  host configuration
--------------------------------

admlocal@srv-alex:~$ uname -a
Linux srv-alex 3.16-2-amd64 #1 SMP Debian 3.16.3-2 (2014-09-20) x86_64 GNU/Linux 

admlocal@srv-alex:~$ cat /etc/debian_version
jessie/sid

admlocal@srv-alex:~$ dpkg -l |grep libc6
ii libc6:amd64 2.19-11 amd64 GNU C Library: Shared libraries ii libc6-dev:amd64 2.19-11 amd64 GNU C Library: Development Libraries and Header Files ii libcompfaceg1 1:1.5.2-5 amd64 Compress/decompress images for mailheaders, libc6 runtime 


Please note that Jessie is up to date when writing this email

admlocal@srv-alex:~$ cat /etc/apt/sources.list |grep -v "#"

deb     http://ftp.fr.debian.org/debian/ jessie main contrib non-free
deb-src http://ftp.fr.debian.org/debian/ jessie main contrib non-free

root@srv-alex:~# lsmod |grep nfs
nfsv3                  37551  1
nfs                   187961  2 nfsv3
fscache                45542  1 nfs
nfsd                  263053  9
auth_rpcgss            51240  1 nfsd
nfs_acl                12511  2 nfsd,nfsv3
lockd                  83417  3 nfs,nfsd,nfsv3
sunrpc                237445  30 nfs,nfsd,auth_rpcgss,lockd,nfsv3,nfs_acl

- config 2:  container configuration
-----------------------------------
According LXC feature, i have installed one LXC adm64 container based on stable Debian distribution (Wheezy 7.6) in order to be sure to have one stable user space daemon version. 

root@vm-wheezy-x86-amd64-3:~# dpkg -l |grep libc6
ii libc6:amd64 2.13-38+deb7u4 amd64 Embedded GNU C Library: Shared libraries ii libc6-dbg:amd64 2.13-38+deb7u4 amd64 Embedded GNU C Library: detached debugging symbols ii libc6-dev:amd64 2.13-38+deb7u4 amd64 Embedded GNU C Library: Development Libraries and Header Files ii libcompfaceg1 1:1.5.2-5 amd64 Compress/decompress images for mailheaders, libc6 runtime 

root@vm-wheezy-x86-amd64-3:~# dpkg -l |grep nfs
ii libnfsidmap2:amd64 0.25-4 amd64 NFS idmapping library ii nfs-common 1:1.2.6-4 amd64 NFS support files common to client and server ii nfs-kernel-server 1:1.2.6-4 amd64 support for NFS kernel server 

root@vm-wheezy-x86-amd64-3:~# cat /etc/exports  |grep -v '#'
/tmp    *(rw,sync,no_subtree_check)


internal mount point are as follow in the container

root@vm-wheezy-x86-amd64-3:~# df -h
Filesystem Size Used Avail Use% Mounted on 
rootfs                                           190M   38M  142M  22% /
/dev/mapper/vg_wheezy_x86_amd64_3-lv_rootfs      190M   38M  142M  22% /
/dev/mapper/vg_raid_0-lv_tmp_wheezy_x86_amd64_3  4.8G   11M  4.6G   1% /tmp
/dev/mapper/vg_wheezy_x86_amd64_3-lv_var         575M  176M  370M  33% /var
/dev/mapper/vg_wheezy_x86_amd64_3-lv_usr         3.4G  2.7G  528M  84% /usr
tmpfs                                            599M   56K  599M   1% /run
tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 1.2G 0 1.2G 0% /run/shm 
root@vm-wheezy-x86-amd64-3:~# /etc/init.d/nfs-kernel-server restart
[ ok ] Stopping NFS kernel daemon: mountd nfsd.
[ ok ] Unexporting directories for NFS kernel daemon....
[ ok ] Exporting directories for NFS kernel daemon....
[ ok ] Starting NFS kernel daemon: nfsd mountd.
As it is not possible for my contianer to insert nfsd kernel module, this one is loaded in /etc/module on the host during booting processus.
The container is starting and the last daemon run (nfsd), but in dmesg, i have following message.... 

[  160.421748] ------------[ cut here ]------------
[ 160.421777] WARNING: CPU: 5 PID: 4638 at /build/linux-P15SNz/linux-3.16.3/fs/nfsd/nfs4recover.c:1195 nfsd4_umh_cltrack_init+0x3a/0x40 [nfsd]() [ 160.421779] NFSD: attempt to initialize umh client tracking in a container! [ 160.421900] Modules linked in: veth nfsv3 nfs fscache binfmt_misc bridge 8021q garp stp mrp llc iTCO_wdt iTCO_vendor_support ppdev joydev raid0 radeon ttm coretemp drm_kms_helper psmouse drm kvm_intel evdev i5000_edac pcspkr i2c_algo_bit edac_coe serio_raw kvm parport_pc parport shpchp i2c_i801 i2c_core i5k_amb lpc_ich mfd_core rng_core processor thermal_sys button nfsd auth_rpcgss oid_registry nfs_acl lockd sunrpc loop autofs4 ext4 crc16 mbcache jbd2 dm_mod raid1 md_mod hid_generic usbhi hid sg sd_mod crc_t10dif crct10dif_generic ses enclosure crct10dif_common ehci_pci uhci_hcd ehci_hcd tg3 ptp aacraid usbcore pps_core libphy usb_common scsi_mod [ 160.421953] CPU: 5 PID: 4638 Comm: rpc.nfsd Tainted: G I 3.16-2-amd64 #1 Debian 3.16.3-2 [ 160.421955] Hardware name: IBM IBM eServer x3400-[7976ABG]-/M97IP, BIOS IBM BIOS Version 1.62-[SPE162AUS-1.62]- 11/09/2007 [ 160.421958] 0000000000000009 ffffffff81506188 ffff8801b6f87d98 ffffffff81065707 [ 160.421961] ffff8800b9df7600 ffff8801b6f87de8 ffff8800b9df7600 0000000000000008 [ 160.421963] 0000000000000000 ffffffff8106576c ffffffffa02e27a8 0000000000000018 
[  160.421967] Call Trace:
[  160.421975]  [<ffffffff81506188>] ? dump_stack+0x41/0x51
[  160.421980]  [<ffffffff81065707>] ? warn_slowpath_common+0x77/0x90
[  160.421983]  [<ffffffff8106576c>] ? warn_slowpath_fmt+0x4c/0x50
[ 160.421991] [<ffffffffa02dd1aa>] ? nfsd4_umh_cltrack_init+0x3a/0x40 [nfsd] [ 160.421998] [<ffffffffa02de461>] ? nfsd4_client_tracking_init+0x81/0x130 [nfsd] [ 160.422006] [<ffffffffa02d8a62>] ? nfs4_state_start_net+0x2a2/0x340 [nfsd] 
[  160.422013]  [<ffffffffa02b3b20>] ? nfsd_svc+0x1d0/0x330 [nfsd]
[  160.422019]  [<ffffffffa02b4600>] ? write_pool_threads+0x260/0x260 [nfsd]
[  160.422025]  [<ffffffffa02b468a>] ? write_threads+0x8a/0xf0 [nfsd]
[  160.422031]  [<ffffffff8113ecca>] ? __get_free_pages+0xa/0x50
[  160.422035]  [<ffffffff811ca5e0>] ? simple_transaction_get+0xa0/0xc0
[ 160.422041] [<ffffffffa02b4093>] ? nfsctl_transaction_write+0x43/0x70 [nfsd] 
[  160.422045]  [<ffffffff811a52f2>] ? vfs_write+0xb2/0x1f0
[  160.422048]  [<ffffffff811a5e32>] ? SyS_write+0x42/0xa0
[ 160.422052] [<ffffffff8150c26d>] ? system_call_fast_compare_end+0x10/0x15 [ 160.422086] WARNING: CPU: 5 PID: 4638 at /build/linux-P15SNz/linux-3.16.3/fs/nfsd/nfs4recover.c:530 nfsd4_legacy_tracking_init+0x1aa/0x240 [nfsd]() [ 160.422087] NFSD: attempt to initialize legacy client tracking in a container!
After killing all processes, container and removing kernel module, i restart the same scenario 

root@srv-alex:~# rmmod nfsd
root@srv-alex:~# rmmod nfsd
rmmod: ERROR: Module nfsd is not currently loaded
root@srv-alex:~# lsmod |grep nfs
nfsv3                  37551  1
nfs                   187961  2 nfsv3
fscache                45542  1 nfs
nfs_acl                12511  1 nfsv3
lockd                  83417  2 nfs,nfsv3
sunrpc                237445  18 nfs,auth_rpcgss,lockd,nfsv3,nfs_acl

root@srv-alex:~# modprobe nfsd nfs4_disable_idmapping=0

then restart the container...
lxc-start -f /etc/lxc/auto/vm-wheezy-x86-amd64-3 -n vm-wheezy-x86-amd64-3

LXC container config is ...
root@srv-alex:~# cat /etc/lxc/auto/vm-wheezy-x86-amd64-3   |grep -v "#"

---------------------- container config --------------

lxc.arch                 = amd64
lxc.utsname              = vm-wheezy-x86-amd64-3
lxc.start.auto           = 1

lxc.tty                  = 4
lxc.pts                  = 1024
lxc.rootfs               = /var/lib/lxc/vm-wheezy-x86-amd64-3/rootfs
lxc.cgroup.devices.deny  = a
lxc.cgroup.devices.allow = c 1:3 rwm
lxc.cgroup.devices.allow = c 1:5 rwm
lxc.cgroup.devices.allow = c 5:1 rwm
lxc.cgroup.devices.allow = c 5:0 rwm
lxc.cgroup.devices.allow = c 4:0 rwm
lxc.cgroup.devices.allow = c 4:1 rwm
lxc.cgroup.devices.allow = c 1:9 rwm
lxc.cgroup.devices.allow = c 1:8 rwm
lxc.cgroup.devices.allow = c 136:* rwm
lxc.cgroup.devices.allow = c 5:2 rwm
lxc.cgroup.devices.allow = c 10:235 rwm
lxc.cgroup.devices.allow = c 254:0 rwm
lxc.mount.entry = proc /var/lib/lxc/vm-wheezy-x86-amd64-3/rootfs/proc proc nodev,noexec,nosuid 0 0 lxc.mount.entry = devpts /var/lib/lxc/vm-wheezy-x86-amd64-3/rootfs/dev/pts devpts defaults 0 0 lxc.mount.entry = sysfs /var/lib/lxc/vm-wheezy-x86-amd64-3/rootfs/sys sysfs defaults 0 0 

lxc.cgroup.cpuset.cpus   = 1-7

lxc.network.type         = veth
lxc.network.flags        = up
lxc.network.link         = br-admin
lxc.network.name         = eth0-admin
lxc.network.hwaddr       = 02:00:00:02:01:00
lxc.network.veth.pair    = e0-wham64adm

lxc.network.type         = veth
lxc.network.flags        = up
lxc.network.link         = br-services
lxc.network.name         = eth1-services
lxc.network.hwaddr       = 02:00:00:02:01:01
lxc.network.veth.pair    = e1-wham64srv

lxc.network.type         = veth
lxc.network.flags        = up
lxc.network.link         = br-users
lxc.network.name         = eth2-users
lxc.network.hwaddr       = 02:00:00:02:01:02
lxc.network.veth.pair    = e2-wham64usr
---------------------- container config END --------------


..... and the problem occurs with the same error.
Of course, as there is a one fatal error in the kernel, it is not possible to restart the container due to temporary name used when creating network interface (unrelated problem with NFS, i hope!), and the server must be restarted....or all nfsd processus must be killed with -9 signal 

The container NFS config is :
root@srv-alex:~# cat /var/lib/lxc/vm-wheezy-x86-amd64-3/rootfs/etc/default/nfs-common |grep -v '#' 
-------------------------- start config ----------------------
NEED_STATD=yes

STATDOPTS="--port 32766 --outgoing-port 32765"

NEED_IDMAPD=no

NEED_GSSD=no
-------------------------- end config ----------------------
root@srv-alex:~# cat /var/lib/lxc/vm-wheezy-x86-amd64-3/rootfs/etc/default/nfs-kernel-server |grep -v '#' 
-------------------------- start config ----------------------
RPCNFSDCOUNT=8

RPCNFSDPRIORITY=0
RPCMOUNTDOPTS='--manage-gids --port 32767 --num-threads=6 --no-nfs-version 4' 

NEED_SVCGSSD=no

RPCSVCGSSDOPTS=

-------------------------- end config ----------------------

The log when booting the container is ....
-------------------------- start log ----------------------
root@srv-alex:~# lxc-start -f /etc/lxc/auto/vm-wheezy-x86-amd64-3 -n vm-wheezy-x86-amd64-3 
INIT: version 2.88 booting
Using makefile-style concurrent boot in runlevel S.
Setting the system clock.
hwclock: Cannot access the Hardware Clock via any known method.
hwclock: Use the --debug option to see the details of our search for an access method. 
Unable to set System Clock to: Sun Sep 28 17:31:07 CEST 2014 ... (warning).
Activating swap...done.
Cleaning up temporary files... /tmp /lib/init/rw.
Mount point '/dev/console' does not exist. Skipping mount. ... (warning).
Mount point '/dev/tty1' does not exist. Skipping mount. ... (warning).
Mount point '/dev/tty2' does not exist. Skipping mount. ... (warning).
Mount point '/dev/tty3' does not exist. Skipping mount. ... (warning).
Mount point '/dev/tty4' does not exist. Skipping mount. ... (warning).
Mount point '/dev/ptmx' does not exist. Skipping mount. ... (warning).
Activating lvm and md swap...done.
Checking file systems...fsck from util-linux 2.20.1
done.
Mounting local filesystems...done.
/etc/init.d/mountall.sh: 59: kill: Illegal number: 3 1
Activating swapfile swap...done.
Cleaning up temporary files....
Setting kernel variables ...done.
Configuring network interfaces...Internet Systems Consortium DHCP Client 4.2.2 
Copyright 2004-2011 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/eth0-admin/02:00:00:02:01:00
Sending on   LPF/eth0-admin/02:00:00:02:01:00
Sending on   Socket/fallback
DHCPDISCOVER on eth0-admin to 255.255.255.255 port 67 interval 5
DHCPREQUEST on eth0-admin to 255.255.255.255 port 67
DHCPOFFER from 192.168.9.8
DHCPACK from 192.168.9.8
bound to 192.168.9.29 -- renewal in 25 seconds.
if-up.d/mountnfs[eth0-admin]: waiting for interface eth1-services before doing NFS mounts ... (warning). 
Internet Systems Consortium DHCP Client 4.2.2
Copyright 2004-2011 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/eth1-services/02:00:00:02:01:01
Sending on   LPF/eth1-services/02:00:00:02:01:01
Sending on   Socket/fallback
DHCPDISCOVER on eth1-services to 255.255.255.255 port 67 interval 8
DHCPREQUEST on eth1-services to 255.255.255.255 port 67
DHCPOFFER from 192.168.6.2
DHCPACK from 192.168.6.2

Debian GNU/Linux 7 vm-wheezy-x86-amd64-3 console

vm-wheezy-x86-amd64-3 login: root
Password:
Last login: Sun Sep 28 17:15:01 CEST 2014 on console
Linux vm-wheezy-x86-amd64-3 3.16-2-amd64 #1 SMP Debian 3.16.3-2 (2014-09-20) x86_64 


-------------------------- end log ----------------------


I tried also to put the parameter to RPCNFSDCOUNT=1,
and the result is after error
----------------------------start trace -------------------------------
[ 2996.630588] ------------[ cut here ]------------
[ 2996.630608] WARNING: CPU: 7 PID: 11074 at /build/linux-P15SNz/linux-3.16.3/fs/nfsd/nfs4recover.c:1195 nfsd4_umh_cltrack_init+0x3a/0x40 [nfsd]() [ 2996.630609] NFSD: attempt to initialize umh client tracking in a container! [ 2996.630729] Modules linked in: nfsd veth nfsv3 nfs fscache binfmt_misc bridge 8021q garp stp mrp llc iTCO_wdt iTCO_vendor_support ppdev joydev raid0 radettm coretemp drm_kms_helper psmouse drm kvm_intel evdev i5000_edac pcspkr i2c_algo_bit edac_core serio_raw kvm parport_pc parport shpchp i2c_i801 i2c_core amb lpc_ich mfd_core rng_core processor thermal_sys button auth_rpcgss oid_registry nfs_acl lockd sunrpc loop autofs4 ext4 crc16 mbcache jbd2 dm_mod raidod hid_generic usbhid hid sg sd_mod crc_t10dif crct10dif_generic ses enclosure crct10dif_common ehci_pci uhci_hcd ehci_hcd tg3 ptp aacraid usbcore pps_cophy usb_common scsi_mod [last unloaded: nfsd] [ 2996.630790] CPU: 7 PID: 11074 Comm: rpc.nfsd Tainted: G W I 3.16-2-amd64 #1 Debian 3.16.3-2 [ 2996.630792] Hardware name: IBM IBM eServer x3400-[7976ABG]-/M97IP, BIOS IBM BIOS Version 1.62-[SPE162AUS-1.62]- 11/09/2007 [ 2996.630794] 0000000000000009 ffffffff81506188 ffff8801b6813d98 ffffffff81065707 [ 2996.630797] ffff8801b5d45e00 ffff8801b6813de8 ffff8801b5d45e00 0000000000000001 [ 2996.630800] 0000000000000000 ffffffff8106576c ffffffffa02e27a8 0000000000000018 
[ 2996.630803] Call Trace:
[ 2996.630811]  [<ffffffff81506188>] ? dump_stack+0x41/0x51
[ 2996.630816]  [<ffffffff81065707>] ? warn_slowpath_common+0x77/0x90
[ 2996.630819]  [<ffffffff8106576c>] ? warn_slowpath_fmt+0x4c/0x50
[ 2996.630826] [<ffffffffa02dd1aa>] ? nfsd4_umh_cltrack_init+0x3a/0x40 [nfsd] [ 2996.630832] [<ffffffffa02de461>] ? nfsd4_client_tracking_init+0x81/0x130 [nfsd] [ 2996.630839] [<ffffffffa02d8a62>] ? nfs4_state_start_net+0x2a2/0x340 [nfsd] 
[ 2996.630844]  [<ffffffffa02b3b20>] ? nfsd_svc+0x1d0/0x330 [nfsd]
[ 2996.630850]  [<ffffffffa02b4600>] ? write_pool_threads+0x260/0x260 [nfsd]
[ 2996.630855]  [<ffffffffa02b468a>] ? write_threads+0x8a/0xf0 [nfsd]
[ 2996.630860]  [<ffffffff8113ecca>] ? __get_free_pages+0xa/0x50
[ 2996.630864]  [<ffffffff811ca5e0>] ? simple_transaction_get+0xa0/0xc0
[ 2996.630869] [<ffffffffa02b4093>] ? nfsctl_transaction_write+0x43/0x70 [nfsd] 
[ 2996.630873]  [<ffffffff811a52f2>] ? vfs_write+0xb2/0x1f0
[ 2996.630876]  [<ffffffff811a5e32>] ? SyS_write+0x42/0xa0
[ 2996.630880] [<ffffffff8150c26d>] ? system_call_fast_compare_end+0x10/0x15 
[ 2996.630882] ---[ end trace 61dda43e27c71f62 ]---
[ 2996.630887] ------------[ cut here ]------------
[ 2996.630894] WARNING: CPU: 7 PID: 11074 at /build/linux-P15SNz/linux-3.16.3/fs/nfsd/nfs4recover.c:530 nfsd4_legacy_tracking_init+0x1aa/0x240 [nfsd]() [ 2996.630895] NFSD: attempt to initialize legacy client tracking in a container! [ 2996.630999] Modules linked in: nfsd veth nfsv3 nfs fscache binfmt_misc bridge 8021q garp stp mrp llc iTCO_wdt iTCO_vendor_support ppdev joydev raid0 ttm coretemp drm_kms_helper psmouse drm kvm_intel evdev i5000_edac pcspkr i2c_algo_bit edac_core serio_raw kvm parport_pc parport shpchp i2c_i801 i2c_coamb lpc_ich mfd_core rng_core processor thermal_sys button auth_rpcgss oid_registry nfs_acl lockd sunrpc loop autofs4 ext4 crc16 mbcache jbd2 dm_mod raiod hid_generic usbhid hid sg sd_mod crc_t10dif crct10dif_generic ses enclosure crct10dif_common ehci_pci uhci_hcd ehci_hcd tg3 ptp aacraid usbcore pps_cphy usb_common scsi_mod [last unloaded: nfsd] [ 2996.631043] CPU: 7 PID: 11074 Comm: rpc.nfsd Tainted: G W I 3.16-2-amd64 #1 Debian 3.16.3-2 [ 2996.631045] Hardware name: IBM IBM eServer x3400-[7976ABG]-/M97IP, BIOS IBM BIOS Version 1.62-[SPE162AUS-1.62]- 11/09/2007 [ 2996.631046] 0000000000000009 ffffffff81506188 ffff8801b6813d80 ffffffff81065707 [ 2996.631049] ffff8801b5d45e00 ffff8801b6813dd0 0000000000004000 0000000000000001 [ 2996.631052] 0000000000000000 ffffffff8106576c ffffffffa02e2a28 ffff880100000018 
[ 2996.631055] Call Trace:
[ 2996.631058]  [<ffffffff81506188>] ? dump_stack+0x41/0x51
[ 2996.631061]  [<ffffffff81065707>] ? warn_slowpath_common+0x77/0x90
[ 2996.631064]  [<ffffffff8106576c>] ? warn_slowpath_fmt+0x4c/0x50
[ 2996.631068]  [<ffffffff812b4258>] ? lockref_put_or_lock+0x48/0x80
[ 2996.631074] [<ffffffffa02de2ca>] ? nfsd4_legacy_tracking_init+0x1aa/0x240 [nfsd] [ 2996.631080] [<ffffffffa02de431>] ? nfsd4_client_tracking_init+0x51/0x130 [nfsd] [ 2996.631086] [<ffffffffa02d8a62>] ? nfs4_state_start_net+0x2a2/0x340 [nfsd] 
[ 2996.631091]  [<ffffffffa02b3b20>] ? nfsd_svc+0x1d0/0x330 [nfsd]
[ 2996.631097]  [<ffffffffa02b4600>] ? write_pool_threads+0x260/0x260 [nfsd]
[ 2996.631102]  [<ffffffffa02b468a>] ? write_threads+0x8a/0xf0 [nfsd]
[ 2996.631105]  [<ffffffff8113ecca>] ? __get_free_pages+0xa/0x50
[ 2996.631107]  [<ffffffff811ca5e0>] ? simple_transaction_get+0xa0/0xc0
[ 2996.631112] [<ffffffffa02b4093>] ? nfsctl_transaction_write+0x43/0x70 [nfsd] 
[ 2996.631116]  [<ffffffff811a52f2>] ? vfs_write+0xb2/0x1f0
[ 2996.631118]  [<ffffffff811a5e32>] ? SyS_write+0x42/0xa0
[ 2996.631121] [<ffffffff8150c26d>] ? system_call_fast_compare_end+0x10/0x15 
[ 2996.631123] ---[ end trace 61dda43e27c71f63 ]---
[ 2996.631125] NFSD: Unable to initialize client recovery tracking! (-22)
[ 2996.631127] NFSD: starting 90-second grace period (net ffff8801b6bfa0c0)
----------------------end trace -----------------------------
Last information, ....the host container (Debian Jessie) runs also one NFS client daemon, so i suspect perhapŝ one problem in sysfs on name space code ? 

best regards

--
--------------------------------------
 -- Jean-Marc LACROIX                 --
  -- mailto : jeanmarc.lacroix@free.fr --
    ---------------------------------------

--- End Message ---
--- Begin Message --- 
Hi

As the legacy tracking code won't work in a container, and ist still
the case up to 5.10.28 and up to mainline, i think we can close this
bug to clean up a bit the view of open issues in src:linux.

Feel free to re-open if you disagree.

Regards,
Salvatore

--- End Message ---
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