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-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to crash in Ubuntu. https://bugs.launchpad.net/bugs/1919275 Title: crash utility fails on arm64 with cannot determine VA_BITS_ACTUAL Status in crash package in Ubuntu: New Status in linux package in Ubuntu: Incomplete Status in crash source package in Bionic: Fix Released Status in linux source package in Bionic: Invalid Status in crash source package in Focal: Fix Released Status in linux source package in Focal: Fix Released Status in crash source package in Groovy: Fix Released Status in linux source package in Groovy: Fix Released Bug description: [Impact] On Ubuntu Bionic with the 5.4.0-1038-aws kernel the crash utility 7.2.8-1ubuntu0.18.04 fails with: crash: cannot determine VA_BITS_ACTUAL This bug has been addressed upstream and needed patches both in crash and kernel. Kernel patch : commit bbdbc11804ff0b4130e7550113b452e96a74d16e Author: Bhupesh Sharma <bhsha...@redhat.com> Date: Thu May 14 00:22:37 2020 +0530 arm64/crash_core: Export TCR_EL1.T1SZ in vmcoreinfo Crash patch : commit 1c45cea02df7f947b4296c1dcaefa1024235ef10 Author: Bhupesh Sharma <bhsha...@redhat.com> Date: Tue Jul 14 01:14:49 2020 +0530 arm64: Change tcr_el1_t1sz variable name to TCR_EL1_T1SZ Series affected : Kenrel : This affects Focal (5.4 kernel) and Groovy (5.8 kernel). Hirsute already contains the commit and kernels prior to 5.3 are not affected. Crash : The commit is already in Hirsute. Groovy, Focal and Bionic are affected. In case of Bionic the bug appears only if 5.4 hwe kernel is used. [Test Case] On an arm64 host which runs the affected releases and kernels after creating a crashdump try to open it with crash. It will fail with : crash: cannot determine VA_BITS_ACTUAL [Where problems could occur] Kernel patch : The kernel patch reads the appropriate cpu register and exports TCR_EL1.T1SZ variable in vmcoreinfo. Given that this is a simple operation and that this patch landed upstream in 5.9 and no regressions have been reported, it is safe to assume that the regression potential is minimal. Any potential problem would occur in vmcoreinfo since this is where TCR_EL1.T1SZ variable is exported. Crash patch : This patch renames tcr_el1_t1sz variable to TCR_EL1_T1SZ to be compatible with the kernel change above for crash to be able to read it. The regression potential is small and any problem would regard reading this variable. [Other] Workaround : This bug/change in crash provides a workaround for 5.4+ https://github.com/crash-utility/crash/issues/52 kernels. While it appears as though it this was fixed it https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1858958 it still doesn't seem to work with a 5.4 kernel including. I also tested https://launchpad.net/ubuntu/+source/crash/7.2.8-1ubuntu0.18.04.1/+build/18807621/+files/crash_7.2.8-1ubuntu0.18.04.1_arm64.deb and it exhibits the same problem. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1919275/+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
