Public bug reported: == Comment: #0 - Waiki Wright <wa...@us.ibm.com> - 2020-11-02 17:00:07 ==
---Problem Description--- A data integrity issue was observed with the Ubuntu 20.04 - 5.4.0-52 and 20.10 - 5.8.0-26 kernel on Power 9. The root cause is found in the compiling of p9_hmi_special_emu(). When doing a VMX store (in __get_user_atomic_128_aligned()) to a buffer (vbuf), the buffer is not 128 bit aligned. The fixes of this bug are accepted upstream: 1. https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=fixes&id=1da4a0272c5469169f78cd76cf175ff984f52f06 ("powerpc: Fix undetected data corruption with P9N DD2.1 VSX CI load emulation") 2. https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=fixes&id=d1781f23704707d350b8c9006e2bdf5394bf91b2 ("selftests/powerpc: Make alignment handler test P9N DD2.1 vector CI load workaround") ** Affects: ubuntu-power-systems Importance: High Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) Status: New ** Affects: linux (Ubuntu) Importance: Undecided Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) Status: New ** Tags: architecture-ppc64le bugnameltc-189000 severity-medium targetmilestone-inin2010 ** Tags added: architecture-ppc64le bugnameltc-189000 severity-medium targetmilestone-inin2010 ** Changed in: ubuntu Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) ** Package changed: ubuntu => linux (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1902694 Title: Ubuntu 20.10- Undetected Data corruption in MPI workloads that use VSX for reductions on POWER9 DD2.1 systems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1902694/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
