tree 2091af7c0c745f7e31b02e01f94372d0a92101f4
parent d081edee3aa2695765ff836197846b89ab712b05
author Oleg Nesterov <oleg@redhat.com> 1407532757 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1412546056 -0700

vm_is_stack: use for_each_thread() rather then buggy while_each_thread()

commit 4449a51a7c281602d3a385044ab928322a122a02 upstream.

Aleksei hit the soft lockup during reading /proc/PID/smaps.  David
investigated the problem and suggested the right fix.

while_each_thread() is racy and should die, this patch updates
vm_is_stack().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reported-by: Aleksei Besogonov <alex.besogonov@gmail.com>
Tested-by: Aleksei Besogonov <alex.besogonov@gmail.com>
Suggested-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Li Zefan <lizefan@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>