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seize: detach from all processes before waiting the root task

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We need to detach from all processes before waiting the root
task, because one of these processes may collect processes from a
target pid namespace. The pid namespace is destroyed only when all
processes have been killed and collected.

https://jira.sw.ru/browse/PSBM-43089
Signed-off-by: Andrew Vagin <avagin@virtuozzo.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
This commit is contained in:
Andrew Vagin
2016-01-16 05:57:52 +03:00
committed by Pavel Emelyanov
parent 2f80e54cd9
commit 15c9eb220e
1 changed files with 8 additions and 2 deletions
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10
seize.c
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@@ -452,10 +452,16 @@ void pstree_switch_state(struct pstree_item *root_item, int st)
for_each_pstree_item(item)
unseize_task_and_threads(item, st);
/*
* We need to detach from all processes before waiting the init
* process, because one of these processes may collect processes from a
* target pid namespace. The pid namespace is destroyed only when all
* processes have been killed and collected.
*/
freezer_detach();
if (st == TASK_DEAD)
pstree_wait(root_item);
freezer_detach();
}
static pid_t item_ppid(const struct pstree_item *item)