[CRIU] remap_dead_pid test hang?

[Pavel Emelyanov]

On 03/19/2015 09:54 PM, Tycho Andersen wrote:
> On Thu, Mar 19, 2015 at 07:36:41PM +0300, Pavel Emelyanov wrote:
>> On 03/19/2015 05:54 PM, Tycho Andersen wrote:
>>> Hi all,
>>>
>>> While testing the cgroup property restore patch, I noticed that the
>>> remap_dead_pid test seems to hang both with my patch and the current
>>> master. Has anyone else noticed this?
>>
>> No. We have Jenkins running full zdtm suite (and more) in 7x24 manner
>> and though it fails sometimes, but we haven't met any issues with this
>> particular test.
>>
>> Does the test hang by itself, or after restore?
> 
> How do I tell? It looks like it's just hung:
> 
> root     32749  0.0  0.1  11652  3292 pts/1    S    18:49   0:00 /bin/bash ./zdtm.sh --ct -r static/remap_dead_pid
> root       314  0.0  0.0   4196   644 pts/1    S    18:49   0:00  \_ ./zdtm_ct ./zdtm.sh -r static/remap_dead_pid
> root       370  0.0  0.1  11752  3476 ?        Ss   18:49   0:00      \_ /bin/bash ./zdtm.sh -r static/remap_dead_pid
> root     15963  0.0  0.1  11752  2372 ?        S    18:49   0:00          \_ /bin/bash ./zdtm.sh -r static/remap_dead_pid
> root     15964  0.0  0.1   8464  2332 ?        S    18:49   0:00              \_ make -C zdtm/live/static remap_dead_pid.pid
> 18943    17937  0.0  0.0   4492   816 ?        S    18:49   0:00                  \_ ./remap_dead_pid --pidfile=remap_dead_pid.pid --outfile=remap_dead_pid.out
> 18943    17940  0.0  0.0   4492   104 ?        Ss   18:49   0:00                      \_ ./remap_dead_pid --pidfile=remap_dead_pid.pid --outfile=remap_dead_pid.out
> 18943    17941  0.0  0.0   4492  1136 ?        S    18:49   0:00                          \_ ./remap_dead_pid --pidfile=remap_dead_pid.pid --outfile=remap_dead_pid.out

Hm... :) There should be a directory where criu is supposed to put it's output
(logs and images), the test/dump/ one if I'm not mistaken. Then you can check
the remap_dead_pid's directory to container dump.log or restore.log to find
out whether any of those actions took place.


> This only seems to happen when I run it via `sudo make test`. If I run it via
> `sudo ./zdtm.sh -r static/remap_dead_pid`, it completes successfully.

That's interesting :) Andrey, do you have any ideas why this can happen?

Thanks,
Pavel