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5eeb2ca02a
To prevent races with ep_remove_waitqueue() removing the waitqueue at the same time. Reported-by: syzbot+a2a3c4909716e271487e@syzkaller.appspotmail.com Signed-off-by: Martijn Coenen <maco@android.com> Cc: stable <stable@vger.kernel.org> # 4.14+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>