** Description changed: [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 - + 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 - + arm64: Change tcr_el1_t1sz variable name to TCR_EL1_T1SZ [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] - [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.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1919275 Title: crash utility fails on arm64 with cannot determine VA_BITS_ACTUAL To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1919275/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
