The commit is pushed to "branch-rh7-3.10.0-327.36.1.vz7.18.x-ovz" and will
appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-327.36.1.vz7.18.3
------>
commit 6626da2a1f42e5c5abeb258904fd1db494df4629
Author: Andrey Ryabinin <aryabi...@virtuozzo.com>
Date: Mon Oct 3 14:56:10 2016 +0000
ms/coredump: fix unfreezable coredumping task
It could be not possible to freeze coredumping task when it waits
for 'core_state->startup' completion, because threads are frozen
in get_signal() before they got a chance to complete 'core_state->startup'.
Use freezer_do_not_count() to tell freezer to ignore coredumping
task while it waits for core_state->startup completion.
https://jira.sw.ru/browse/PSBM-52793
Link:
http://lkml.kernel.org/r/1475225434-3753-1-git-send-email-aryabi...@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
Cc: sta...@vger.kernel.org
Acked-by: Oleg Nesterov <o...@redhat.com>
Acked-by: Pavel Machek <pa...@ucw.cz>
Reviewed-by: Dmitry Safonov <dsafo...@virtuozzo.com>
---
fs/coredump.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/coredump.c b/fs/coredump.c
index e3fdee2..f6a1012 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -1,6 +1,7 @@
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/fdtable.h>
+#include <linux/freezer.h>
#include <linux/mm.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
@@ -388,7 +389,9 @@ static int coredump_wait(int exit_code, struct core_state
*core_state)
if (core_waiters > 0) {
struct core_thread *ptr;
+ freezer_do_not_count();
wait_for_completion(&core_state->startup);
+ freezer_count();
/*
* Wait for all the threads to become inactive, so that
* all the thread context (extended register state, like
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