[Bug 2003851] Re: occasional hanging 'apt-get update' from daily cronjob since Jammy 22.04
Following up again. Disabling retries reduced the frequency of this bug, but didn't eliminate it. On the other hand, the patch I shared does seem to fix the bug. No occurrences since we shipped it ~2 weeks ago. I encourage others to try it out. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2003851 Title: occasional hanging 'apt-get update' from daily cronjob since Jammy 22.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/2003851/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2003851] Re: occasional hanging 'apt-get update' from daily cronjob since Jammy 22.04
Following up, `Acquire::Retries=0` seems to be avoiding the bug in prod, which strengthens my suspicion that it's related to retries. As for the actual bug, when apt is hanging, I notice that the work queue has items in it, but they have not been delegated to a worker. There is a condition that is supposed to "unstuck" the queue here[1], but for some reason `GetFetchAfter` is returning a zeroed time_point which avoids that condition[2]. The way we're setting `FetchAfter` looks OK to me[3] though I'm not familiar with std::chrono. Maybe there's some other place where we're partially copying the item or instantiating a new item and failing to copy the `FetchAfter` value. A bandaid patch is attached. I'm not sure if there's any downside in calling `Cycle` there. A real bugfix IMO would address the zeroed `FetchAfter` value described above, or potentially refactor so that work items are immediately delegated instead of having to rely on calling `Cycle` at the right time. I am missing a lot of context so that maybe that's not possible. [1] https://salsa.debian.org/apt- team/apt/-/blob/db797312548f6e7d6d1d1faa9f1e48c1e521d290/apt- pkg/acquire.cc#L738-740 [2] https://salsa.debian.org/apt- team/apt/-/blob/db797312548f6e7d6d1d1faa9f1e48c1e521d290/apt- pkg/acquire.cc#L733-736 [3] https://salsa.debian.org/apt- team/apt/-/blob/db797312548f6e7d6d1d1faa9f1e48c1e521d290/apt- pkg/acquire-worker.cc#L651-655 ** Attachment added: "patch" https://bugs.launchpad.net/ubuntu/+source/apt/+bug/2003851/+attachment/5759339/+files/patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2003851 Title: occasional hanging 'apt-get update' from daily cronjob since Jammy 22.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/2003851/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2003851] Re: occasional hanging 'apt-get update' from daily cronjob since Jammy 22.04
Hello, also affected by this. I'm able to reproduce the bug using Walter's mock server. I suspect it may be related to the retry code that kicks in when a transient error is encountered (like a 503). Retries are enabled by default since apt 2.3.2, which seems to fit the regression window people have mentioned here. Frustratingly, I can't reproduce while step debugging, I'm guessing because the bug is clock-dependent. Setting either `Acquire::Retries::Delay=false` or `Acquire::Retries=0` seems to mitigate it. I'm curious if that works for others as well. I'll be testing this in prod soon and will report back. In the mean time I'll keep trying to find the actual bug. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2003851 Title: occasional hanging 'apt-get update' from daily cronjob since Jammy 22.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/2003851/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1584412] [NEW] Random crashes in hsw_unclaimed_reg_debug in i915 driver
Private bug reported: Kernel sporadically crashes in hsw_unclaimed_reg_debug in i915 driver. Seems to happen only when video is playing, but not sure. Details from `ubuntu-bug` are attached. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1 ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8 Uname: Linux 4.4.0-22-generic x86_64 ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 CurrentDesktop: XFCE Date: Sat May 21 21:28:27 2016 InstallationDate: Installed on 2016-04-27 (24 days ago) InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) SourcePackage: xserver-xorg-video-intel UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: xserver-xorg-video-intel (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug xenial ** Information type changed from Public to Private -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1584412 Title: Random crashes in hsw_unclaimed_reg_debug in i915 driver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1584412/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
