** Changed in: linux (Ubuntu)
Status: Incomplete => Fix Released
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https://bugs.launchpad.net/bugs/1836971
Title:
sched: Prevent CPU lockups when task groups take longer than the
I installed linux-hwe 4.15.0-57 #63~16.04.1-Ubuntu on xenial, placed a
heavy load on the system.
Everything seemed stable and no lockups occurred. Due to the successful
tests in the hadoop environment under bionic and the nature of this
patch being from upstream stable, I am happy to mark this as
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag 'verifica
I installed 4.15.0-56 from -proposed and ran some CPU stress tests and
everything was stable and no problems detected.
The kernel was also installed onto a few machines from the production hadoop
cluster which experienced extremely high cpu load, and the kernel is stable,
with
no CPU lockups in s
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag 'verifica
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1836971
Title:
sched: Prevent CPU lockups when task groups take longer
** Description changed:
BugLink: https://bugs.launchpad.net/bugs/1836971
[Impact]
On machines with extremely high CPU usage, parent task groups which have
a large number of children can make the for loop in
sched_cfs_period_timer() run until the watchdog fires when the
cfs_period
