Why can't operations after volatile read be reordered?

there is some doubt about the reading semantics of volatile:
Why can"t normal read and volatile read after volatile read be reordered?
volatile read I know it is to fetch variable values directly from main memory, but since they are both reads, will it affect the acquisition of each other"s variable values?

Concurrent virtual-machine jvm java
Apr.10,2021

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MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b30ed6-2b4ce.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b30ed6-2b4ce.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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