** Description changed: There was a code change in the NFS write code that went into the 6.11 Kernel mainline. This bug was reported: https://bugzilla.kernel.org/show_bug.cgi?id=219508 The symptoms of this are that when there are a lot of writes to a mounted NFS share, especially through a VM or Docker, a soft lockup will occur. Based on the reverted commit this is because the assumptions made in the newer write code didn't account for a failed or short write. Ultimately this would cause an infinite loop where the NFS write never could release. The offending commit was here: https://github.com/torvalds/linux/commit/b571cfcb9dcac187c6d967987792d37cb0688610#diff- fc1b4de72479f94c3f3a9d6f626078f5392d88be93cfce08bb32883ac7a91a97L169 This was recently reverted: https://github.com/torvalds/linux/commit/66f9dac9077c9c063552e465212abeb8f97d28a7 This has been applied to the latest mainline 6.11.11 patch as well. This - reversion was not included in the recent kernel release. + reversion was not included in the recent ubunutu 6.11.0-12-generic + kernel release. Description: Ubuntu 24.10 Release: 24.10
** Description changed: There was a code change in the NFS write code that went into the 6.11 Kernel mainline. This bug was reported: https://bugzilla.kernel.org/show_bug.cgi?id=219508 The symptoms of this are that when there are a lot of writes to a mounted NFS share, especially through a VM or Docker, a soft lockup will occur. Based on the reverted commit this is because the assumptions made in the newer write code didn't account for a failed or short write. Ultimately this would cause an infinite loop where the NFS write never could release. + + On two of my machines that run routine backups of my homelab, there were + multiple lockups per week. Re-compiling the 6.11.9 Kernel without the + offending code ahs resolved the soft lockup in one of the machines. The + second continues to lock-up at least once a week. It's hard to reproduce + consistently because you'd need to recreate the condition of a short + write or network failure after the first block completes. The offending commit was here: https://github.com/torvalds/linux/commit/b571cfcb9dcac187c6d967987792d37cb0688610#diff- fc1b4de72479f94c3f3a9d6f626078f5392d88be93cfce08bb32883ac7a91a97L169 This was recently reverted: https://github.com/torvalds/linux/commit/66f9dac9077c9c063552e465212abeb8f97d28a7 This has been applied to the latest mainline 6.11.11 patch as well. This reversion was not included in the recent ubunutu 6.11.0-12-generic kernel release. Description: Ubuntu 24.10 Release: 24.10 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2091789 Title: Soft Lock Ups in NFS Write in Linux Kernel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2091789/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
