So it appears that the mpt2sas driver is heavily spamming kernel messages and this causes a massive backlog. The low-latency kernel trying to log these to the backing store and this is causing more load.
I've changed the messages to be pr_err_ratelimited and the issue goes away. I'll send a fix for the driver upstream. Meanwhile, since this is triggered only by hard hammering of the sysfs entries I think I'll add a autodetection of kernel log spamming in the stressor and flag this automatically. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1791246 Title: sysfs test in ubuntu_stress_smoke_test will hang on a X-HWE lowlatency node To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1791246/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
