This occurs because fork/vfork/clone system calls numbers are aliased on
this system, so these slipped through the detection of these and we get
fork bombing.  I've added forking limitation rlimits and CPU limiting as
well as more intelligent fork/vfork/clone system call detection before
system call time and also detection of child generations post-system
call to avoid these fork bomb conditions.

Two fixes were required and have been pushed to the repo:

I've tested these and they seem to address this issue.  Do you mind
testing this and then we can close this bug.

** Changed in: stress-ng (Ubuntu)
       Status: In Progress => Fix Committed

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  stress-ng will make an Ubuntu on LPAR s390x Bionic system become very

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