2013/4/13 Oleg Nesterov <o...@redhat.com> > > exit_notify() does exit_task_namespaces() after > forget_original_parent(). This was needed to ensure that ->nsproxy > can't be cleared prematurely, an exiting child we are going to > reparent can do do_notify_parent() and use the parent's (ours) pid_ns. > > However, after 32084504 "pidns: use task_active_pid_ns in > do_notify_parent" ->nsproxy != NULL is no longer needed, we rely > on task_active_pid_ns(). > > Move exit_task_namespaces() from exit_notify() to do_exit(), after > exit_fs() and before exit_task_work(). > > This solves the problem reported by Andrey, free_ipc_ns()->shm_destroy() > does fput() which needs task_work_add(). And this allows us do simplify > exit_notify(), we can avoid unlock/lock(tasklist) and we can change > ->exit_state instead of PF_EXITING in forget_original_parent(). >
It looks good for me. I have tested it a bit and don't find any problem. Oleg, thank you. Acked-by: Andrew Vagin <ava...@gmail.com> > Reported-by: Andrey Vagin <ava...@openvz.org> > Signed-off-by: Oleg Nesterov <o...@redhat.com> > > --- x/kernel/exit.c > +++ x/kernel/exit.c > @@ -649,7 +649,6 @@ static void exit_notify(struct task_stru > * jobs, send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2) > */ > forget_original_parent(tsk); > - exit_task_namespaces(tsk); > > write_lock_irq(&tasklist_lock); > if (group_dead) > @@ -795,6 +794,7 @@ void do_exit(long code) > exit_shm(tsk); > exit_files(tsk); > exit_fs(tsk); > + exit_task_namespaces(tsk); > exit_task_work(tsk); > check_stack_usage(); > exit_thread(); > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
