Vanilla Minecraft crashes with EXCEPTION_ACCESS_VIOLATION after changing RAM
I could make a few suggestions, that
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you could try updating java version to latest.
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You could try installing java x86 version as suggested by @MrParrot.
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You could try giving more ram to minecraft, remember keeping at least 3gb free for your pc to function properly.
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The most obvious one is to write a support email or report error to Mojang.
I hope this could help you. If not, then I am sorry.