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657b17a86f
In linux, when a FIFO is opened and there are no writers, the reader will continuously receive the HUP event. This can be problematic when creating containers in detached mode, as the stdin FIFO writer is closed after the container is created, resulting in this situation. In passfd io mode, open stdin fifo with O_RDWR|O_NONBLOCK to avoid the HUP event. Fixes: #6714 Signed-off-by: Zixuan Tan <tanzixuan.me@gmail.com>