Hrm, this looks like it might be a legit regression. 4.4.0-8 passes the
test, while 4.4.0-9.X is failing. In both instances,
/proc/sys/kernel/yama/ptrace_scope is set to 1. It looks like cousin
processes are allowed to ptrace each other, which yama's ptrace
restrictions should prevent.
Looking at
** Attachment added: "Failure log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1551894/+attachment/4585827/+files/log.gz
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https://bugs.launchpad.net/bugs/1551894
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