+ coredump-fix-unfreezable-coredumping-task.patch added to -mm tree

The patch titled
     Subject: coredump: fix unfreezable coredumping task
has been added to the -mm tree.  Its filename is
     coredump-fix-unfreezable-coredumping-task.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/coredump-fix-unfreezable-coredumping-task.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/coredump-fix-unfreezable-coredumping-task.patch

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/SubmitChecklist when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Andrey Ryabinin <redacted>
Subject: 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.

Link: http://lkml.kernel.org/r/1475225434-3753-1-git-send-email-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <redacted>
Acked-by: Pavel Machek <redacted>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Tejun Heo <tj@kernel.org>
Cc: "Rafael J. Wysocki" <redacted>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: <redacted>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/coredump.c |    3 +++
 1 file changed, 3 insertions(+)

diff -puN fs/coredump.c~coredump-fix-unfreezable-coredumping-task fs/coredump.c

--- a/fs/coredump.c~coredump-fix-unfreezable-coredumping-task
+++ a/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>

@@ -423,7 +424,9 @@ static int coredump_wait(int exit_code,
 	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

_

Patches currently in -mm which might be from aryabinin@virtuozzo.com are

coredump-fix-unfreezable-coredumping-task.patch