Public bug reported: The communication application stops. We have confirmed that image communication continues for more than two days in kernel 5 and kernel 6.2. However, when the kernel is upgraded to 6.5, it stops after a few minutes. It is reproducible.
There are two similar applications, but both of them stop when upgraded to 6.5. Specifically, mutual exclusion control is performed between the timer processing thread and the packet reception processing thread using a mutex. The timer is once every 10 seconds, and the reception process is several thousand times per second for image communication. One application can be run with gdb, but it was confirmed that futex_wait() is displayed when the application stops. The following site (in Japanese) contains information about a futex related bug. According to this, when upgrading to RHEL 6.6, 7.0, or 7.1, applications using futex stop with futex_wait(). https://access.redhat.com/ja/solutions/1517543 No similar information was found in case of Ubuntu. Also, there seems to be no similar information in the Ubuntu bug reports. The kernels I have tried so far are as follows: linux-image-5.15.0-102-generic OK linux-image-6.2.0-39-generic OK linux-image-6.5.0-35-generic NG ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: linux-image-6.5.0-35-generic 6.5.0-35.35~22.04.1 ProcVersionSignature: Ubuntu 6.5.0-35.35~22.04.1-generic 6.5.13 Uname: Linux 6.5.0-35-generic x86_64 ApportVersion: 2.20.11-0ubuntu82 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Tue Jun 4 18:58:23 2024 InstallationDate: Installed on 2024-06-03 (0 days ago) InstallationMedia: Ubuntu 22.04 "Jammy Jellyfish" - Release amd64(20220502) ProcEnviron: PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=ja_JP.UTF-8 SHELL=/bin/bash RebootRequiredPkgs: Error: path contained symlinks. SourcePackage: linux-signed-hwe-6.5 UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: linux-signed-hwe-6.5 (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug jammy wayland-session -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2068015 Title: Exclusive control dosen't work properly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-6.5/+bug/2068015/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
