[CRIU] [PATCH 2/2] tests: prevent zdtm_mount_cgroups from failing w/ EBUSY

[Andrew Vagin]

On Tue, Feb 02, 2016 at 09:56:41AM +1100, Tycho Andersen wrote:
> Sometimes I get:
> 
> sudo ./zdtm.py run -t zdtm/live/static/cgroup03
> umount: /home/tycho/packages/criu/test/zdtm.qPwsoO: target is busy
>         (In some cases useful info about processes that
>          use the device is found by lsof(8) or fuser(1).)
> Traceback (most recent call last):
>   File "./zdtm.py", line 1401, in <module>
>     tst.available()
>   File "./zdtm.py", line 435, in available
>     subprocess.check_call(["flock", "zdtm_mount_cgroups", "./zdtm_mount_cgroups"])
>   File "/usr/lib/python2.7/subprocess.py", line 540, in check_call
>     raise CalledProcessError(retcode, cmd)
> subprocess.CalledProcessError: Command '['flock', 'zdtm_mount_cgroups', './zdtm_mount_cgroups']' returned non-zero exit status 1
> 
> let's use a lazy unmount so we avoid this.
>

Acked-by: Andrew Vagin <avagin at virtuozzo.com>
 
> Signed-off-by: Tycho Andersen <tycho.andersen at canonical.com>
> ---
>  test/zdtm_mount_cgroups | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/test/zdtm_mount_cgroups b/test/zdtm_mount_cgroups
> index d7bc142..34e0e85 100755
> --- a/test/zdtm_mount_cgroups
> +++ b/test/zdtm_mount_cgroups
> @@ -11,6 +11,6 @@ for i in "zdtmtst" "zdtmtst.defaultroot"; do
>  	mount -t cgroup -o none,name=$i zdtm $tdir &&
>  	# a fake group prevents destroying of a controller
>  	mkdir -p $tdir/holder &&
> -	umount $tdir || exit 1
> +	umount -l $tdir || exit 1
>  done
>  rmdir $tdir
> -- 
> 2.5.0
> 
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