[Bug 1118447] Re: Race condition with network and NFS mounts causes boottime hang

The task "linux (Ubuntu)" has expired because it has had no new comments or updates for more than three years. If this issue is still present in an Ubuntu LTS kernel still under active support, please reopen the bug and provide updated details. If this issue was reported against an Ubuntu kernel no longer under active support but the issue still exists in a currently supported Ubuntu kernel, please open a new bug against that kernel version and provide the updated details, with a reference link to the original bug. This action was performed by an automated process maintained by the Ubuntu Kernel Team. ** Tags added: kernel-autoclosed kernel-autoclosed-expired ** Changed in: linux (Ubuntu) Status: Confirmed => Expired -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/1118447 Title: Race condition with network and NFS mounts causes boottime hang Status in linux package in Ubuntu: Expired Status in nfs-utils package in Ubuntu: Incomplete Bug description: I seem to experience a race condition during boot of my ubuntu 12.04 server: In approx. one of seven boots, the server hangs during bootup. This is what I see on the screen: After the line  * Starting configure network device there is a short delay of about 1 second, then messages continue. I see  * Starting Mount network filesystems [ OK ]  * Starting set sysctls from /etc/sysctl.conf [ OK ]  * Starting configure network device [ OK ]  * Stopping Mount network filesystems [ OK ]  * Stopping set sysctls from /etc/sysctl.conf [ OK ]  * Starting Block the mounting event for NFS filesytems until statd is running [ OK ]  * Stopping Block the mounting event for NFS filesytems until statd is running [ OK ]  * Starting Block the mounting event for NFS filesytems until statd is running [ OK ]  * Stopping Block the mounting event for NFS filesytems until statd is running [ OK ] The last messages repeats several times, and then the boot process hangs. In 6/7 of cases, I wait for a minute, and after that bootup continues. But in approx 1/7 cases, the system hangs at this point forever. The machine does not respond to CTRL-ALT-DEL, I have to reboot it using SysRq-Keys. WORKAROUND: Setting the NFS entries in fstab to "noauto" completely removes the problem: There is no timeout during boot, and no lockup any more. The machine boote smoothly with the NFS-shares unmounted. After the machine is up, we can manually mount the NFS-shares without a problem. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.2.0-37-generic 3.2.0-37.58 ProcVersionSignature: Ubuntu 3.2.0-37.58-generic 3.2.35 Uname: Linux 3.2.0-37-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. AplayDevices: aplay: device_list:252: keine Soundkarten gefunden ... ApportVersion: 2.0.1-0ubuntu17.1 Architecture: amd64 ArecordDevices: arecord: device_list:252: keine Soundkarten gefunden ... AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC1', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D3p', '/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: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. CurrentDmesg: [ 85.200104] lxcbr0: no IPv6 routers present Date: Thu Feb 7 15:50:40 2013 HibernationDevice: RESUME=UUID=6c172536-57cc-4deb-867a-0718d572f23e IwConfig:  lo no wireless extensions.  eth0 no wireless extensions.  lxcbr0 no wireless extensions. MachineType: To be filled by O.E.M. To be filled by O.E.M. MarkForUpload: True ProcEnviron:  LANGUAGE=de:en  TERM=xterm  PATH=(custom, no user)  LANG=de_DE.UTF-8  SHELL=/bin/bash ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-37-generic root=/dev/mapper/lvmvg-root ro debug splash vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Es läuft kein PulseAudio-Dienst oder nicht als Sessiondienst. RelatedPackageVersions:  linux-restricted-modules-3.2.0-37-generic N/A  linux-backports-modules-3.2.0-37-generic N/A  linux-firmware 1.79.1 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to precise on 2012-04-28 (285 days ago) dmi.bios.date: 07/04/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 0302 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: M5A97 EVO R2.0 dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0302:bd07/04/2012:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnM5A97EVOR2.0:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To be filled by O.E.M. dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: To be filled by O.E.M. 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