Summary File descriptor obtained using open() cannot be used in flock() call when the file is on NFS mount. @roblourens Some specific storages don't support flock () file locking with their NFS implementation so the workaround is to disable flock () on the mount with nolock parameter. I just checked the manpage of flock, in the NOTES section comes the important part: You only opened the file for reading, which is the reason why the flock call fails. https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-ssh-nightly, Make sure you uninstall the stable version before using the nightly version. this? Apple: Issues sharing folder through NFS - RPC: Unable to send; errno = Bad file descriptor or Program not registeredHelpful? Already on GitHub? @roblourens One side effect I am seeing of remote.SSH.lockfilesInTmp is that when I start a terminal on the remote machine it does not load my bash settings from my home folder, i.e. Locks . Try: flock -e myfile.lock ls The number is the file descriptor of the usage alternativ: ( flock -e 200 ls ) 200>myfile.lock See the man page. I think I read that flock should be supported on NFSv4. Sorry I should have bumped the version number to prevent that. Sign in I would like to use a semaphore to avoid modifications on this file until I am done with it. Thanks/ LIKITH.S Share 367 views Related Questions Related Tags You're trying to compile in an NFS mounted directory, right? 16 comments droundy commented on Oct 26, 2016 added a commit that referenced this issue added a commit to engine-flutter-autoroll/flutter that referenced this issue on Oct 17, 2018 mentioned this issue on Oct 17, 2018 I found it updates to 0.44.2 after I connecting to the server. /usr/xxx -access=hostname I ran exportfs -av and /etc/xtab looks fine. One downside is that this would not be safe when the home folder is mapped to two different machines, and vscode connects to those two machines simultaneously. Not clear if I have to find another locking solution entirely or what. I get the following from dpkg -l | grep nfs-common They are generally non-negative values. By clicking Sign up for GitHub, you agree to our terms of service and SHARE COMMENTS I get the f. I have a .bash_profile file that is normally read. http://git.linux-nfs.org/?p=steved/cthon04.git;a=blob;f=lock/tlock.c;h=8c837a87976d17c58a25c9bd08d9f935e4521402;hb=HEAD#l835. Why do quantum objects slow down when volume increases? *RFC PATCH 0/7] crypto: x86 - fix RCU stalls @ 2022-10-06 22:31 Robert Elliott 2022-10-06 22:31 ` [RFC PATCH 1/7] rcu: correct CONFIG_EXT_RCU_CPU_STALL_TIMEOUT descriptions Robert Elliott ` (7 more replies) 0 siblings, 8 replies; 125+ messages in thread From: Robert Elliott @ 2022-10-06 22:31 UTC (permalink / raw) To: herbert, davem . The only difference, is the file system where the fileNames are located. All jobs that try to create a project lock in this folder will fail with: awx/main/tasks.py", line 1865, in acquire_lock fcntl.flock(self.lock_fd, fcntl.LOCK_EX | fcntl.LOCK_NB) OSError: [Errno 9] Bad file descriptor. Bad exchange descriptor : not able to remove files under zpool Hi , One of my zone went down and when i booted it up i could see the pool in degraded state with some check sum errors . The text was updated successfully, but these errors were encountered: Hi @roblourens , yes I'm using the NFS file system. UUID: 0xxxxxe. I'm happy to help out. Now I am trying on 14.04 with 1:1.2.8-6ubuntu1.2 and it still seems fine. flockfile(3), This means that you will be able to override the lock if you don't cooperate. An attempt to lock the file using one of these file descriptors may be denied by a lock that the calling process has already placed via another file descriptor. The idea is to avoid the file being written while a process is still reading it. Capacity 261853184 (63929 file blocks * 4096), 78376960 (19135 blocks) avail. Can add that I am seeing this error on an Ubuntu 14.04.5 LTS server, which is mounting the home directory using nfs version 4.0. Use the following command to open a network socket file descriptor. Thanks in advance vmware-53.log CID Chain.zip Exchange Server 1.vmx 0 Kudos This is an fragment of the code I am using. The flock command works on file descriptors, not files. Is this an at-all realistic configuration for a DHC-2 Beaver? However it looks like the code is written to handle the case where all 100 iterations fail NFSv4 with Kerberos - idmap stops working after ~35 minutes, Parallel MPI_File_open failed on NFSv4 but ran on NFSv3. This means that fcntl (2) and flock () locks do interact with one another over NFS. You can see this by using strace, that's how I discovered it. With over 10 pre-installed distros to choose from, the worry-free installation life is here! If I disconnect from the server and re-connect again, I got the same error. Or your local laptop. It works for the first time. BSD locks (flock) The simplest and most common file locks are provided by flock (2). It worked after installing nightly version of remote SSH extension and checking "Lockfiles In Tmp". For details of in-depth Note. vfat-0.04 file system spanning 1 partitions. Our file locking is based on https://gist.github.com/przemoc/571091 if you care to do any experimentation yourself. On the client I'd doing: Code: # mount -t nfs 10.100.100.12:/3wm storage mount: 10.100.100.12:/3wm failed, reason given by server: Permission denied mount: mounting 10.100.100.12:/3wm on storage failed: Bad file descriptor. The following command will allow you to open a file descriptor in /etc/fstab. Please support me on Patreon: . I'm suffering this issue so much. If my answer solved your question, please mark it as accepted answer Ready to optimize your JavaScript with Rust? fork(2), @roblourens Forgive my ignorance, but where would I find the nightly? We can probably live with that. And here is a test script is you can try running against your NFS $HOME. that I teach, look here. . I mean, the "server" in this case is the file server that hosts your NFS directory. *br> /br> in the sudo mount -t dir. You will probably get the same error, I just want to verify that the simplest possible case produces the same result. Can someone tell me the output of dpkg -l | grep nfs-common so I can use exactly the same version of the client code? Because I need to map this file on disk using mmap (), which requires a file descriptor. One is the byte range locks, the second is the access share. fileName is supposed to be a valid existing file, I am reading a fileName and making a copy, editing some few parts. Help us identify new roles for community members. Making statements based on opinion; back them up with references or personal experience. You cooperate by requesting the lock before doing the operation, and then by releasing the lock after you're done. . I was able to connect to the remote server. You can disable extensions.autoUpdate temporarily to prevent it from overwriting the vsix. If found to be negative, that indicates error or a "no value" condition. When I try to set lock on the file using the fcntl it fails with Permission denied. Connect and share knowledge within a single location that is structured and easy to search. Could not establish SSH connection: flock: 99: Input/output error. Can you provide more information about. I would like to clarify. Thanks/ LIKITH.S Share 356 views Related Questions Related Tags NAME | SYNOPSIS | DESCRIPTION | RETURNVALUE | ERRORS | CONFORMINGTO | NOTES | SEEALSO | COLOPHON, Pages that refer to this page: You could set up a situatiion where one instance of the script acquires a lock and sleeps for a bit then a second instance of the script tries to acquire the lock and fails nicely with no weird error messages. Tomorrow's nightly build of the ssh extension will have the setting remote.SSH.lockfilesInTmp that you can set to do the same thing. *PATCH 000/104] virtiofs daemon [all] @ 2019-12-12 16:37 Dr. David Alan Gilbert (git) 2019-12-12 16:37 ` [PATCH 001/104] virtiofsd: Pull in upstream headers Dr. David Alan Gilbert (git) ` (106 more replies) 0 siblings, 107 replies; 307+ messages in thread From: Dr. David Alan Gilbert (git) @ 2019-12-12 16:37 UTC (permalink / raw) To: qemu-devel, stefanha, vgoyal From: "Dr. David Alan Gilbert . Hi I am trying to install the docker-image of V2.0.0p9 on my docker-swarm setup with NFS for volumes. And maybe dpkg -l | grep nfs-kernel-server if you have access to the server. The others are required by Kubernetes: --PACKAGES: - vim - htop - tmux - kubelet - kubeadm - kubectl - kubernetes-cni - docker.io The configuration: Built-in firewall is disabled and there is no third party firewall installed. Bad file descriptor. Whether you are a digital nomad or just looking for flexibility, Shells can put your Linux machine on the device that you want to use. You could try running that script, and replace the /var/lock/ path with a path that is inside your user directory on the NFS drive I'm using NFS4. lslocks(8), Copyright and license for this manual page. getrlimit(2), Mount NFS folder on /var/lib/awx/projects. This issue is particularly known for DataDomain storage. The latter is simply a way to manage the systems calls from shell scripts or the command line. Thanks! By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Have a question about this project? Well you should not get this input/output error. I was able to mount with version 4.0 and it still works. The functionality is provided by an additional (external to nfs protocol) lock manager. @roblourens nightly version for me also working, thanks. It's the operation that is protected by the lock, not (necessarily) the lock file itself. Under our NFS4-Installation I always get into this condition, Edit: This program was working perfectly until stop doing so. I also reproduced the connection several times and there was no error. I belive this question would more fit on StackOverflow instead on this site. In my case, I don't believe its the nfs host, because I can use the extension to go to a different computer that mounts the same home directory. how to do the experiment using the code in the Gist? privacy statement. data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKAAAAB4CAYAAAB1ovlvAAAAAXNSR0IArs4c6QAAAnpJREFUeF7t17Fpw1AARdFv7WJN4EVcawrPJZeeR3u4kiGQkCYJaXxBHLUSPHT/AaHTvu . I don't have the access to the server hosting the NFS directory. Server Fault is a question and answer site for system and network administrators. Turning the sco machine into an nfs server instead of a client. Moreover, there are two types of locks. Which could be reason. I had to move the openwrt tree to a local filesystem to be able to compile. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. checked the values matching in the web gui as well. Yes, I ran the test script on the remote machine. Yes. This works for me. ret->set(::open(path.c_str(), flag), path); - int fd=::open(path.c_str(), O_RDONLY | O_CREAT, S_IRWXU | S_IRGRP | S_IROTH); + int fd=::open(path.c_str(), flag | O_CREAT, S_IRWXU | S_IRGRP | S_IROTH). Well I can add a setting to put the lock in /tmp. All the must configure features in busybox and kernel is turn on. Thanks! Is it appropriate to ignore emails from a student asking obvious questions? Even the OS (SLE15.2) is the same with kernel 5.3.18, and using strerror(errno) produces a seg fault on NFS4. You have answered my question. Hi @roblourens This is more reliable on some filesystems, Ansible version: ansible-2.8.0-1.el7.ans.noarch. rev2022.12.11.43106. Moreover the hardcoded file descriptor may already be used. Do you have any ideas what is happening? Finding the original ODE using a solution. Uninstall the ssh extension Download this, change extension .vsix remote-ssh-.44.1.zip You should alter it to report the errno reason for the failure as it might indicate a more fundamental issue with your locking -- such as trying to open a file you dont have permission to or doesn't exist. Clone: 36% done.Failed to clone disk : Bad file descriptor (589833). Network File System (NFS), a distributed file system protocol developed by Sun Microsystems. dbopen(3), In Python, file descriptors are integers (positive) that identify the kernel's open files kept in a table of files. flock does advisory locking, which is a cooperative locking scheme. Previous message (by thread): [OpenWrt-Devel] Fwd: OpenWRT Build Process broken on recent Debian NFS Next message (by thread): [OpenWrt-Devel] Fwd: OpenWRT Build Process broken on recent Debian NFS . It is now read-only. To get locking to work with nfs v4 and v3 you need to use byte range locking which is available as fcntl or lockf functions. Gradle captures the output of ndk-build (probably using a pipe), and I see the errors with either Android Studio or running ./gradlew at the CLI, but only if I configure gradle to pass -jN . HTML rendering created 2021-08-27 Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? chown(2), Well occasionally send you account related emails. we have brought the pool online after scrubbing. There is no output for dpkg -l | grep nfs-kernel-server. Raw Receiving error "flock: 11: Bad file descriptor" on 7.4. Here were my steps: Firstly edited the config.php in /var/www/fog/commons and reset the tftp password there and in the web gui interface. Dual EU/US Citizen entered EU on US Passport. But there is no output. Could not establish SSH connection to remote using Remote - SSH, Have to kill the vscode-server process for each SSH-connect [RHEL/CentOS 6.10] NFSv4. File descriptor obtained using os.open() cannot be used in fcntl.flock() call when the file is on NFS mount. So I set up an NFS drive for testing and I am able to use vscode remote on that drive with no issues , Can you run mount and share the line for the NFS drive? How can you know the sky Rose saw when the Titanic sunk? What properties should my fictional HEAT rounds have to punch through heavy armor and ERA? fcntl.flock(os.open()) does not work on NFS mount. great! I was connecting to a remote machine using SSH-Remote. It should be run on the remote where the NFS drive is. (If the execve (2) fails, the file descriptor is left open.) I got a pop-up window showing Could not establish connection to "xxxx.yyyy.zzz". Can really only tell you that the lock failed or succeeded but not why. Since Linux 2.6.37, the kernel supports a compatibility mode that allows flock() locks . IBM's technical support site for all IBM products and services including self help and the ability to engage with IBM support engineers. Thanks for contributing an answer to Server Fault! maintainer of the The text was updated successfully, but these errors were encountered: "Bad file descriptor" when trying to lock file on NFS mount. Can confirm that above script causes the original error on the 'exlock_now || exit 1' line (and severs my ssh connection). Currently, only one such flag is defined: FD_CLOEXEC, the close-on-exec flag. with "Install from VSIX" command), Try again, this will keep the lock in /tmp, let me know whether it works. Solution Use the following command to mount NFS: I executed "exportfs -ra" on the host. Some shells do not support file descriptors larger than 9. system msg for write_line failure: Bad file descriptor I am wondering if anyone has any experience on how to solve this issue. Japanese girlfriend visiting me in Canada - questions at border control? You should print the errno (as suggested by others) to see why the lock request had failed. You can open a new issue with some details. Therefore, exit () is never called. When I try to set lock on the file using the fcntl it fails with Permission denied. Reset the values manually in the aforementioned config file for STORAGE_DATADIR & STORAGE_DATADIR_UPLOAD. I've tried different settings in the /etc/exports file. The nfs server's ip is 192.168.1.6 and busybox version is 1.1.3. It also means that in order to place an exclusive lock, the file must be opened for writing. Features: not specified in POSIX, but widely available on various Unix systems With advanced shells (bash, ksh93, zsh), the following can be done: nfs(5), You could try running that script, and replace the, What the exact command should I use? CONFIG_FEATURE_MOUNT_NFS is set to y. I assume that /var/lock is not an NFS drive for you correct? Originally locks were in /var/lock but on some systems users do not have write access to /var/lock. thank you. Does illicit payments qualify as transaction costs? The mount command shows me the following about the mount, (rw,sec=sys,addr=x.x.x.x,clientaddr=0.0.0.0). We'll discuss it below. fcntl.flock(open()) does work, or at least does not fail. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. to your account. Using this VSIX extension I successfully connected to the remote machine and opened project folders. It was hard to test though because it kept updating itself before I could test it and I kept forgetting that there were hanging processes on the remote from previous attempts. However it takes an extremely long time to untar the downloaded package For dpkg -l | grep nfs-kernel-server I meant run that on the server, if you have access to it. Resend (apologies, tried to send it to -users by mistake initially). Already on GitHub? I wonder whether it works because I am technically sharing to the same machine, maybe it takes some shortcut when it knows the drive is really local. NFS flock functionality appears to have changed between RHEL 7.3 and 7.4. To solve this problem, here are the steps to increase this limit. LKML Archive on lore.kernel.org help / color / mirror / Atom feed * [RFC][PATCH 0/9] File descriptor hot-unplug support @ 2009-04-11 12:01 Eric W. Biederman 2009-04-11 12:03 ` [RFC][PATCH 1/9] mm: Introduce remap_file_mappings Eric W. Biederman ` (11 more replies) 0 siblings, 12 replies; 99+ messages in thread From: Eric W. Biederman @ 2009-04-11 12:01 UTC (permalink / raw What happens if the permanent enchanted by Song of the Dryads gets copied? The nfs-client is a windows machine running NT Server. by Michael Kerrisk, Locking of CTA object store files fails on NFS mount. analysis. Therefore you need to take decision on the return code of flock as below. Maybe this is the reason that I was not able to open a folder after the connection was established. This means that fcntl(2) and flock() locks do interact with one another over NFS. fsck(8), It was updated form NFS3 to NFS4. Check the code of the locking test used by nfs developers (including myself) to validate client/server behavior independent of protocol version. Since the application may move on at a later point and open new . ii nfs-common 1:1.2.8-6ubuntu1.2 amd64 NFS support files common to client and server. Disclaimer: Python is not my domain of expertise, I'm just a newbie hacking. A file descriptor is a unique number used to access a data resource. Only after uninstalling and re-installing the extension can I successfully connect to the server again. It fails with the following message: showmount: Cannot retrieve info from host: 192.168.16.51: RPC failed:: RPC: Unable to send; errno = Bad file descriptor I have done the following config on the server: /etc/exports /var/nfs 192.168.x.x/255.255.255. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. If it doesn't help, then please change nfsvers=4 to nfsvers=3, it should help. Closing File Descriptors. Should I exit and re-enter EU with my EU passport or is it ok? Destination disk format: VMFS thick Cloning disk 'Exchange Server 1-000001.vmdk'. privacy statement. I know, while I am doing this, an external process can update the fileName. 220325 17:01:45 41080 ssi_XrdSsiCtaServiceProvider: pid:41080 tid:139722695624832 XrdSsiCtaServiceProvider::Init(): cta::exception::Exception In BackendVFS::lockHelper(): Failed, to flock file /cta-store/ctaObjectStore/.AgentRegister-cta-objectstore-initialize-tpm102.desy.de-14808-20220325-12:05:30-0-0.lock: Bad file descriptor, BackendVFS::ScopedLock * BackendVFS::lockHelper(const std::string& name, int type, uint64_t timeout_us) {. If the FD_CLOEXEC bit is set, the file descriptor will automatically be closed during a successful execve (2). By clicking Sign up for GitHub, you agree to our terms of service and with Creative Commons CC-BY-SA You could change the path in the script to somewhere in /tmp to test. Sorry, I have to find time to set up an NFS drive and do some experimentation. The same code works on other flavors of unix (solaris and HPUX) . to your account. They assist in performing various functions related to files. I don't know why this code is not working under NFS4, using NFS3 works perfectly. File descriptor obtained using open() cannot be used in flock() call when the file is on NFS mount. However, after the connection, it failed to open a folder on the server, showing the same error (flock: 99 Input/output error). https://github.com/ansible/awx/blob/4.0.0/awx/main/tasks.py#L1853. The vars.yml file The vars.yml file just keeps a list of the packages I want to install on each node. tmpfiles.d(5), Oh, I see. Linuxbrew / brew Public archive Notifications Fork 247 Star 2.6k Code Issues Pull requests Actions Wiki Security Insights Can't do anything -- "bad file descriptor" in lock.sh #314 Closed The Linux Programming Interface, It works with a Centos 7.6 server using nfs version 4.1 with the same home directory. The manual page flock(2) had been out of date for a long time, but has since been updated to say (emphasis mine):. Hi all, I am observing an interesting issue with the OpenWRT build process when We have tested the same code on both versions for nfsv3 and it fails with below error on RHEL 7.4 for nfs share. macOS (OS X) can be setup as an NFS client to access shared files on the network. cvs commit: apache-2./apache-nspr/os/win32 modules.c util_win32.c. proc(5), lockf(3), Instead, one could use fcntl (2) byte-range locking, which does work over NFS, given a sufficiently recent version of Linux and a server which supports locking. The best answers are voted up and rise to the top, Not the answer you're looking for? NFS details In Linux kernels up to 2.6.11, flock () does not lock files over NFS (i.e., the scope of locks was limited to the local system). [OpenWrt-Devel] Fwd: OpenWRT Build Process broken on recent Debian NFS Anton Ivanov anton.ivanov at cambridgegreys.com Sun Nov 12 02:41:39 EST 2017. What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked. NFS v3 doesn't have a locking support on the protocol level. Can several CRTs be wired in parallel to one oscilloscope circuit? I tried bash lockable_script_boilerplate.sh but got nothing in the output. author of my_user belongs to admin . Asking for help, clarification, or responding to other answers. *br> Sumake the installation by typing umount -l /etc/fstab. Since Linux 2.6.12, NFS clients support flock () locks by emulating them as fcntl (2) byte-range locks on the entire file. Would like to stay longer than 90 days. I guess it is updating itself on restart of VSCode, and updating from the internet and not the modified package version. And if you know the name of the command to mount the nfs drive, that would be helpful as well. Mine looks like. The file is created in the specified NFS "path" . The problem is that it can't use flock on its lock files. My issue was slightly different. mount:nfsmount failed: Bad file descriptor xiao.liang 15 years ago Hi, I have encoutered a problem when mount a nfs filesystem. Linux/UNIX system programming training courses I think the application's expectation is that it fail rather than returning a decimal-string-only service entity. Check our new training course. @pmgurman Were you able to open folders on the remote machine and successfully re-connect to the remote for multiple times? But maybe the lockfiles should just be stored in /var/lock. The same code works on other flavors of unix (solaris and HPUX) . Any suggestion regarding this problem would be really helpful. FLOCK(2) Linux Programmer's Manual FLOCK(2), Linux 2021-03-22 FLOCK(2). because I had started working with an integer file descriptor instead of a file pointer. I was running dpkg -l | grep nfs-kernel-server on the remote machine, not on my local laptop. Next if you run the code on another terminal it will immediately return to prompt. The command is missing. A BSD lock and an Open file description lock is associated with a file object, while a POSIX record lock is associated with an [i-node, pid] pair. I hope someone can help. Could @dawnmy and @saeedizadi also provide the information please? You may also want to include errno.h in the list of includes too to make sure you reach for the correct variable. The file is created in the specified NFS "path" . It only takes a minute to sign up. My /etc/exports looks like this. I would like to debug, but our sys-admin is not able to. You signed in with another tab or window. On macOS, the output-sync feature tries to lock the output file, but the file locking APIs don't work on a pipe. But no change: /proc/fs/nfs/exports remains empty and the client reports the same . 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