/etc/exports has one line that is not a comment: /home 192.168.1.0/255.255.255.0(rw,sync,root_squash,no_subtree_check)
/etc/defaults/nfs-common: NEED_STATD=no # Options for rpc.statd. STATDOPTS= # Do you want to start the gssd daemon? It is required for Kerberos mounts. NEED_GSSD=no /etc/defaults/nfs-kernel-server # Number of servers to start up RPCNFSDCOUNT=8 # Runtime priority of server (see nice(1)) RPCNFSDPRIORITY=0 # Options for rpc.mountd. RPCMOUNTDOPTS="--manage-gids" # Do you want to start the svcgssd daemon? It is only required for Kerberos # exports. Valid alternatives are "yes" and "no"; the default is "no". NEED_SVCGSSD="no" # Options for rpc.svcgssd. RPCSVCGSSDOPTS="" # Options for rpc.nfsd. RPCNFSDOPTS="--debug --syslog" ################ Note that I tried several alternatives, such as RPCMOUNTDOPTS="--manage-gids --no-nfs-version 4" and other combinations, to no effect. I am mounting Ubuntu 12.04 clients. The relevant entry in /etc/mtab for one of these clients looks like this: 192.168.1.2:/home /mnt/nfshome nfs rw,vers=4,addr=192.168.1.2,clientaddr=192.168.1.9 0 0 The client's nfs-common version is 1:1.2.5-3ubuntu3.1. Also, it makes no difference whether I use mount -t nfs or mount -t nfs4 (in the first case the /etc/mtab entry has vers=4 in the options, in the other case it does not, but the filesystem type is nfs4. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1322407 Title: NFS kernel server creates a kworker with 100% CPU usage, then hangs randomly Status in “linux” package in Ubuntu: Confirmed Bug description: This concerns the server edition of 14.04. I have set up a NFS server. Once I attach at least one client, one kworker process starts to use 100% CPU. The runaway kworker returns to idle when I reset the NFS server daemon with "service nfs-kernel-server stop" followed by "service nfs-kernel-server start". With the nfs kernel server stopped, the CPU remains idle. With the nfs kernel server running, as soon as one client requests a connection, the kworker process jumps to 100% CPU again. After some random time, the nfs kernel server no longer accepts requests from clients. Restarting the service allows clients to reconnect. The syslog shows no relevant information. This problem has never appeared on a very similar server setup with 12.04. Configration: The svcgssd is not running. I played with various configurations (enabling/disabling NFSv3 and NFSv4), but it makes no difference. I tried to enable event debugging: #> echo workqueue:workqueue_queue_work > /sys/kernel/debug/tracing/set_event #> cat /sys/kernel/debug/tracing/trace_pipe > /var/tmp/kerntrace.txt and found the following kernel trace in a tight loop: [...] kworker/2:1-86 [002] d... 161940.910668: workqueue_queue_work: work struct=ffff8804140675e0 function=xs_tcp_setup_socket [sunrpc] workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2 kworker/2:1-86 [002] d.s. 161940.910674: workqueue_queue_work: work struct=ffff8800cef9f488 function=rpc_async_schedule [sunrpc] workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2 kworker/2:1-86 [002] d... 161940.910675: workqueue_queue_work: work struct=ffff8804140675e0 function=xs_tcp_setup_socket [sunrpc] workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2 kworker/2:1-86 [002] d.s. 161940.910681: workqueue_queue_work: work struct=ffff8800cef9f488 function=rpc_async_schedule [sunrpc] workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2 kworker/2:1-86 [002] d... 161940.910682: workqueue_queue_work: work struct=ffff8804140675e0 function=xs_tcp_setup_socket [sunrpc] workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2 kworker/2:1-86 [002] d.s. 161940.910688: workqueue_queue_work: work struct=ffff8800cef9f488 function=rpc_async_schedule [sunrpc] workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2 kworker/2:1-86 [002] d... 161940.910689: workqueue_queue_work: work struct=ffff8804140675e0 function=xs_tcp_setup_socket [sunrpc] workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2 kworker/2:1-86 [002] d.s. 161940.910695: workqueue_queue_work: work struct=ffff8800cef9f488 function=rpc_async_schedule [sunrpc] workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2 kworker/2:1-86 [002] d... 161940.910696: workqueue_queue_work: work struct=ffff8804140675e0 function=xs_tcp_setup_socket [sunrpc] workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2 kworker/2:1-86 [002] d.s. 161940.910702: workqueue_queue_work: work struct=ffff8800cef9f488 function=rpc_async_schedule [sunrpc] workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2 [...] At present, I have to consider NFS fubar. Thanks, Mark ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-24-generic 3.13.0-24.47 ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-24-generic. AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.14.1-0ubuntu3.1 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D2c', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory: 'iw' Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer' Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer' Date: Thu May 22 22:48:48 2014 HibernationDevice: RESUME=UUID=adcdeef5-9b46-4ea4-b9f4-b6e642ea91e8 InstallationDate: Installed on 2014-05-12 (10 days ago) InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2) IwConfig: eth0 no wireless extensions. lo no wireless extensions. MachineType: Gigabyte Technology Co., Ltd. GA-990XA-UD3 ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 nouveaufb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=6cf411b3-3e8e-41e5-8670-db14ad259f58 ro IOMMU=soft nomdmonddf nomdmonisw RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware 1.127.2 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) WifiSyslog: dmi.bios.date: 10/13/2011 dmi.bios.vendor: Award Software International, Inc. dmi.bios.version: F9 dmi.board.name: GA-990XA-UD3 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF9:bd10/13/2011:svnGigabyteTechnologyCo.,Ltd.:pnGA-990XA-UD3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-990XA-UD3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr: dmi.product.name: GA-990XA-UD3 dmi.sys.vendor: Gigabyte Technology Co., Ltd. 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