Even if this was submitted as medium, I bump it to high.
** Also affects: ubuntu-power-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-power-systems
Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage
(ubuntu-power-triage)
** Changed in: ubuntu-power-systems
Importance: Undecided => High
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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
Status in The Ubuntu-power-systems project:
New
Status in linux package in Ubuntu:
New
Bug description:
== Comment: #0 - Waiki Wright <[email protected]> - 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")
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