Public bug reported: We've found on some Apollo Lake system stalls for around 4 seconds on function `wait_for_completion` when creating nodes in devtmpfs. With 70+ nodes created it can be stalled for 5+ minutes when booting.
With bisecting we've found the patch can fix this issue: commit 0905f04eb21fc1c2e690bed5d0418a061d56c225 Author: Yuyang Du <yuyang...@intel.com> AuthorDate: Thu Dec 17 07:34:27 2015 +0800 Commit: Ingo Molnar <mi...@kernel.org> CommitDate: Wed Jan 6 11:06:29 2016 +0100 sched/fair: Fix new task's load avg removed from source CPU in wake_up_new_task() This patch can be clean picked, and shows positive result on multiple Apollo Lake system. The patch is already in v4.5+ so Yakkety is not affected. ** Affects: hwe-next Importance: Undecided Status: New ** Affects: linux (Ubuntu) Importance: Undecided Assignee: Phidias (phidias-chiang) Status: Incomplete ** Tags: originate-from-1610089 somerville xenial ** Tags added: originate-from-1610089 somerville -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643797 Title: System stalls when creating device node on booting To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1643797/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs