We became aware of the Kernel vulnerability and implemented the kernel vulnerability mitigation

The change was to set

kernel.yama.ptrace_scope = 2

(A sysctl setting). For users of MPI jobs, this setting broke the jobs. When we have a fixed kernel and rebooted the nodes, we can change this back to something that will work with MPI.

Workaround or fix, use mpirun --mca btl_vader_single_copy_mechanism none etc...