Cgroup hung system with rt patch, tested under 4.4.32/4.4.66/4.9.30

Cgroup hung system with rt patch, tested under 4.4.32/4.4.66/4.9.30

[Journey Journey]

Hi RT Devs,

I enabled cpu/cpuacct/cpuset/devices/freezer subsystems in cgroup.

Attach serveral thread ids to these systems' tasks file frequently
last 4 or 5 hours(start process,  echo thread ids to tasks, stop
process). The system will hung, no response to user keyboard input.
Through I have enabled kdmp, but this scenario didn't trigger kdump.

Pls help.


Thanks

Re: Cgroup hung system with rt patch, tested under 4.4.32/4.4.66/4.9.30

[Journey Journey]

[-- Attachment #1: Type: text/plain, Size: 757 bytes --]

Specificly, it's cgroup cpu subsystem' problem. You can use the
attached shell script to test.
After several minutes or an hour, the system will hung without
response to user input.

Please help!
1. How to get kernel crash file/vmcore when system hung ?
2. What's the root cause ?


On Mon, Jun 5, 2017 at 12:03 PM, Journey Journey
<journeywang123@gmail.com> wrote:
> Hi RT Devs,
>
> I enabled cpu/cpuacct/cpuset/devices/freezer subsystems in cgroup.
>
> Attach serveral thread ids to these systems' tasks file frequently
> last 4 or 5 hours(start process,  echo thread ids to tasks, stop
> process). The system will hung, no response to user keyboard input.
> Through I have enabled kdmp, but this scenario didn't trigger kdump.
>
> Pls help.
>
>
> Thanks

[-- Attachment #2: test.sh --]
[-- Type: application/x-sh, Size: 1258 bytes --]