Hello Joshua, or anyone else affected, Accepted kexec-tools into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/kexec- tools/1:2.0.10-1ubuntu2.4 in a few hours, and then in the -proposed repository.
Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed.Your feedback will aid us getting this update out to other Ubuntu users. If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-xenial to verification-done-xenial. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-xenial. In either case, details of your testing will help us make a better decision. Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance! ** Description changed: [Impact] Currently it's not possible to use the kdump functionality in xenial - when running the linux-azure kernel. The problem is actually caused but + when running the linux-azure kernel. The problem is actually caused by several factors: 1. kexec fails to parse /proc/kcore and thus fails to load the crash kernel. That's similar to bug #1713940 and it's related to 4.10+ kernels. 2. When the crash kernel boots, a bug in KASLR causes it to crash in a very early stage. For the user, it seems the system just rebooted after the crash. 3. Currently in azure, crashkernel=128G is not enough to boot and run the dump procedure with 4.11+ kernels. That value needs to be increased in order to kdump to succeed. 4. After the vmcore is dumped, the current version of crash in xenial is not able to parse it. All the necessary fixes are already upstream and can be backported. [Test Case] 1. Install the linux-azure kernel in an azure instance (although it's possible to run linux-azure in bare metal or kvm, the KASLR issue only is triggered in azure). 2. Follow the instructions in https://help.ubuntu.com/lts/serverguide /kernel-crash-dump.html to setup kdump and manually trigger a crash using /proc/sysrq-trigger. The vmcore must be generated and it should be possible to inspect it using crash. [Regression Potential] Since both kexec-tools and crash are being changed to support 4.10+ kernels, it's very important that they continue to handle 4.4 kernels properly. The same steps above can be used to test linux-generic for regressions. [Other Info] Original description: --8<-- Because the linux-azure kernel is based on 4.11, kexec on 16.04 gives the following error: kdump-tools[1436]: ELF core (kcore) parse failed Perhaps the artful kexec-tools should be backported? --8<-- ** Description changed: [Impact] Currently it's not possible to use the kdump functionality in xenial when running the linux-azure kernel. The problem is actually caused by several factors: 1. kexec fails to parse /proc/kcore and thus fails to load the crash kernel. That's similar to bug #1713940 and it's related to 4.10+ kernels. 2. When the crash kernel boots, a bug in KASLR causes it to crash in a very early stage. For the user, it seems the system just rebooted after the crash. 3. Currently in azure, crashkernel=128G is not enough to boot and run the dump procedure with 4.11+ kernels. That value needs to be increased in order to kdump to succeed. 4. After the vmcore is dumped, the current version of crash in xenial is not able to parse it. All the necessary fixes are already upstream and can be backported. [Test Case] 1. Install the linux-azure kernel in an azure instance (although it's possible to run linux-azure in bare metal or kvm, the KASLR issue only is triggered in azure). 2. Follow the instructions in https://help.ubuntu.com/lts/serverguide /kernel-crash-dump.html to setup kdump and manually trigger a crash using /proc/sysrq-trigger. The vmcore must be generated and it should be possible to inspect it using crash. + 3. Perform these same tests for the linux-generic kernel, on each + supported architecture. + [Regression Potential] Since both kexec-tools and crash are being changed to support 4.10+ kernels, it's very important that they continue to handle 4.4 kernels properly. The same steps above can be used to test linux-generic for regressions. [Other Info] Original description: --8<-- Because the linux-azure kernel is based on 4.11, kexec on 16.04 gives the following error: kdump-tools[1436]: ELF core (kcore) parse failed Perhaps the artful kexec-tools should be backported? --8<-- ** Changed in: kexec-tools (Ubuntu Xenial) Status: In Progress => Fix Committed ** Tags added: verification-needed verification-needed-xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1712867 Title: [Hyper-V] 16.04 kexec-tools doesn't match linux-azure To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1712867/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
