More tests on a bare-metal and a KVM node with 4.18.0-18 / -17 / -16 / -11 shows that: * This issue can be reproduced on these kernels * Bare metal system tend to pass with the ftrace test on the first run, but it will hang with the second / third attempt if you run it again * KVM nodes tend to fail on the first attempt (3 out of 4 kernels), and if it has passed, the second attempt will reproduce this as well.
As the fact that the test tend to pass with the first attempt on bare metals, and we might just retry if has failed, I think all these combined leads to this situation. For the patched kernel, I can re-run the ftrace test for 5 times without any interruptions on both of the bare-metal and the KVM node. I will test Bionic next and prepare a SRU for Cosmic. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1826385 Title: ftrace in ubuntu_kernel_selftests hang with Cosmic kernel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1826385/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
