diff options
| author | Tejun Heo <tj@kernel.org> | 2019-05-31 10:38:57 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-09 17:53:36 +0200 |
| commit | d7b538a6c9678fcc6f00b6024bcbfd4bb0593d1c (patch) | |
| tree | c3655427af581f554ec5f8d71ec49b7f98038256 /kernel | |
| parent | c30c2b103edfdb523b67aa7f94b49646bb888e6e (diff) | |
cgroup: Call cgroup_release() before __exit_signal()
commit 6b115bf58e6f013ca75e7115aabcbd56c20ff31d upstream.
cgroup_release() calls cgroup_subsys->release() which is used by the
pids controller to uncharge its pid. We want to use it to manage
iteration of dying tasks which requires putting it before
__unhash_process(). Move cgroup_release() above __exit_signal().
While this makes it uncharge before the pid is freed, pid is RCU freed
anyway and the window is very narrow.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/exit.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 95ce231ff5e2..15437cfdcd70 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -193,6 +193,7 @@ repeat: rcu_read_unlock(); proc_flush_task(p); + cgroup_release(p); write_lock_irq(&tasklist_lock); ptrace_release_task(p); @@ -218,7 +219,6 @@ repeat: } write_unlock_irq(&tasklist_lock); - cgroup_release(p); release_thread(p); call_rcu(&p->rcu, delayed_put_task_struct); |