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kernel test robot reported that RCU stall via printk() flooding is possible [1] when stress testing. Link: https://lkml.kernel.org/r/20211129073709.GA18483@xsang-OptiPlex-9020 [1] Reported-by: kernel test robot <oliver.sang@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Jens Axboe <axboe@kernel.dk>