https://github/greenplum-db/gpdb/blob/6.7.1/src/backend/storage/buffer/bufmgr.c
zero_damaged_pages = false
max_wal_size = 2GB
文件系统问题(GlusterFS etc..)
其他程序或者操作甚至驱动程序影响了buffer文件
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This has been seen to occur with buggy kernels consider updating your system
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