** Changed in: hwe-next
Assignee: Anthony Wong (anthonywong) => AceLan Kao (acelankao)
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https://bugs.launchpad.net/bugs/1643797
Title:
System stalls when creating device node on booting
Status in HWE Next:
New
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Xenial:
Fix Committed
Bug description:
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 <[email protected]>
AuthorDate: Thu Dec 17 07:34:27 2015 +0800
Commit: Ingo Molnar <[email protected]>
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.
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