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: http://kernel.ubuntu.com/git/cking/stress-ng.git/commit/?id=94d7b0a34e5208cc9b0d5287c6e2f5349694f176 http://kernel.ubuntu.com/git/cking/stress-ng.git/commit/?id=d01abd84f03f65e5303746eee7b318675c04827c 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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1753705 Title: stress-ng will make an Ubuntu on LPAR s390x Bionic system become very slow To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/stress-ng/+bug/1753705/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
