Hi all, I am from the Canonical's kernel team and currently investigating this issue. In this case, jammy-hwe, mantic-hwe, and noble by default uses 6.8 kernel (when a generic jammy and mantic is installed it uses hwe version by default). So, the issue is with 6.8 kernel rather than series.
I was not able to reproduce the error with generic 6.8.0-45.45 kernel after 1 hour of stressing. I am still working on this. I really appreciate all the feedback you provided. Meanwhile, for those who are having the problem, I have created an unofficial version of 6.8.0-45.45 kernel which includes the upstream fix from "6ddc9deacc1312762c2edd9de00ce76b00f69f7c", - for jammy: https://launchpad.net/~mehmetbasaran/+archive/ubuntu/linux-hwe-6.8-6.8.0-45.45-nfs-patch - for noble: https://launchpad.net/~mehmetbasaran/+archive/ubuntu/linux-6.8.0-45.45-nfs-patch Installation instructions: Note that, if you are using secure boot, you will not be able to boot into these kernels. You will need to disable it first. # Add the unofficial ppa. Pick the correct one depending on your series # For jammy: sudo add-apt-repository ppa:mehmetbasaran/linux-hwe-6.8-6.8.0-45.45-nfs-patch # For noble: sudo add-apt-repository ppa:mehmetbasaran/linux-6.8.0-45.45-nfs-patch $ sudo add-apt-repository ppa:mehmetbasaran/linux-6.8.0-45.45-nfs-patch $ sudo apt update $ sudo apt install linux-buildinfo-6.8.0-46-generic-nfs \ linux-cloud-tools-6.8.0-46-generic-nfs \ linux-cloud-tools-common \ linux-headers-6.8.0-46-generic-nfs \ linux-image-unsigned-6.8.0-46-generic-nfs \ linux-modules-6.8.0-46-generic-nfs \ linux-modules-extra-6.8.0-46-generic-nfs \ linux-modules-ipu6-6.8.0-46-generic-nfs \ linux-modules-iwlwifi-6.8.0-46-generic-nfs \ linux-modules-usbio-6.8.0-46-generic-nfs \ linux-nfs-6.8-cloud-tools-6.8.0-46 \ linux-nfs-6.8-headers-6.8.0-46 \ linux-nfs-6.8-tools-6.8.0-46 \ linux-tools-6.8.0-46-generic-nfs Next time you boot, you will be using the patched 6.8.0-45.45 $ uname -r # 6.8.0-46-generic-nfs To return back to the previous kernel (official 6.8.0-45.45) you just need to update grub: $ grep 'menuentry \|submenu ' /boot/grub/grub.cfg | cut -f2 -d "'" # Prints available kernels on your machine, in my case: Ubuntu Advanced options for Ubuntu Ubuntu, with Linux 6.8.0-46-generic-nfs Ubuntu, with Linux 6.8.0-46-generic-nfs (recovery mode) Ubuntu, with Linux 6.8.0-45-generic Ubuntu, with Linux 6.8.0-45-generic (recovery mode) Ubuntu, with Linux 6.5.0-18-generic Ubuntu, with Linux 6.5.0-18-generic (recovery mode) # Change GRUB_DEFAULT in /etc/default/grub # from GRUB_DEFAULT=0 # to GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux 6.8.0-45-generic" $ sudo update-grub $ reboot $ uname -r # 6.8.0-45-generic After changing your kernel to previous version you can completely remove the unofficial kernel: # Now these packages will be safe to be removed $ sudo apt remove linux-buildinfo-6.8.0-46-generic-nfs \ linux-cloud-tools-6.8.0-46-generic-nfs \ linux-headers-6.8.0-46-generic-nfs \ linux-image-unsigned-6.8.0-46-generic-nfs \ linux-modules-6.8.0-46-generic-nfs \ linux-modules-extra-6.8.0-46-generic-nfs \ linux-modules-ipu6-6.8.0-46-generic-nfs \ linux-modules-iwlwifi-6.8.0-46-generic-nfs \ linux-modules-usbio-6.8.0-46-generic-nfs \ linux-nfs-6.8-cloud-tools-6.8.0-46 \ linux-nfs-6.8-headers-6.8.0-46 \ linux-nfs-6.8-tools-6.8.0-46 \ linux-tools-6.8.0-46-generic-nfs # Remove unofficial ppa from update list $ sudo add-apt-repository --remove ppa:mehmetbasaran/linux-6.8.0-45.45-nfs-patch # Restore grub settings # Change GRUB_DEFAULT in /etc/default/grub to GRUB_DEFAULT=0 $ sudo update-grub $ reboot -- 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/2062568 Title: nfsd gets unresponsive after some hours of operation Status in linux package in Ubuntu: Confirmed Status in nfs-utils package in Ubuntu: Confirmed Bug description: I installed the 24.04 Beta on two test machines that were running 22.04 without issues before. One of them exports two volumes that are mounted by the other machine, which primarily uses them as a secondary storage for ccache. After being up for a couple of hours (happened twice since yesterday evening) it seems that nfsd on the machine exporting the volumes hangs on something. From dmesg on the server (repeated a few times): [11183.290548] INFO: task nfsd:1419 blocked for more than 1228 seconds. [11183.290558] Not tainted 6.8.0-22-generic #22-Ubuntu [11183.290563] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [11183.290582] task:nfsd state:D stack:0 pid:1419 tgid:1419 ppid:2 flags:0x00004000 [11183.290587] Call Trace: [11183.290602] <TASK> [11183.290606] __schedule+0x27c/0x6b0 [11183.290612] schedule+0x33/0x110 [11183.290615] schedule_timeout+0x157/0x170 [11183.290619] wait_for_completion+0x88/0x150 [11183.290623] __flush_workqueue+0x140/0x3e0 [11183.290629] nfsd4_probe_callback_sync+0x1a/0x30 [nfsd] [11183.290689] nfsd4_destroy_session+0x186/0x260 [nfsd] [11183.290744] nfsd4_proc_compound+0x3af/0x770 [nfsd] [11183.290798] nfsd_dispatch+0xd4/0x220 [nfsd] [11183.290851] svc_process_common+0x44d/0x710 [sunrpc] [11183.290924] ? __pfx_nfsd_dispatch+0x10/0x10 [nfsd] [11183.290976] svc_process+0x132/0x1b0 [sunrpc] [11183.291041] svc_handle_xprt+0x4d3/0x5d0 [sunrpc] [11183.291105] svc_recv+0x18b/0x2e0 [sunrpc] [11183.291168] ? __pfx_nfsd+0x10/0x10 [nfsd] [11183.291220] nfsd+0x8b/0xe0 [nfsd] [11183.291270] kthread+0xef/0x120 [11183.291274] ? __pfx_kthread+0x10/0x10 [11183.291276] ret_from_fork+0x44/0x70 [11183.291279] ? __pfx_kthread+0x10/0x10 [11183.291281] ret_from_fork_asm+0x1b/0x30 [11183.291286] </TASK> From dmesg on the client (repeated a number of times): [ 6596.911785] RPC: Could not send backchannel reply error: -110 [ 6596.972490] RPC: Could not send backchannel reply error: -110 [ 6837.281307] RPC: Could not send backchannel reply error: -110 ProblemType: Bug DistroRelease: Ubuntu 24.04 Package: nfs-kernel-server 1:2.6.4-3ubuntu5 ProcVersionSignature: Ubuntu 6.8.0-22.22-generic 6.8.1 Uname: Linux 6.8.0-22-generic x86_64 .etc.request-key.d.id_resolver.conf: create id_resolver * * /usr/sbin/nfsidmap -t 600 %k %d ApportVersion: 2.28.1-0ubuntu1 Architecture: amd64 CasperMD5CheckResult: pass Date: Fri Apr 19 14:10:25 2024 InstallationDate: Installed on 2024-04-16 (3 days ago) InstallationMedia: Ubuntu-Server 24.04 LTS "Noble Numbat" - Beta amd64 (20240410.1) NFSMounts: NFSv4Mounts: ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> SourcePackage: nfs-utils UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2062568/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
