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[release/6.0] Fix code heap reservation size - #59918
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When I've moved the heap metadata out of the actual code heaps some time ago, I've forgotten to account for the personality routine slot allocated at the beginning of the heaps. This was exposed by an assert when executing under the JIT stress mode 2. This change fixes it by adding accounting for those. Close#59794
jeffschwMSFT
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Oct 4, 2021
jeffschwMSFT
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Approved. We should take this for consideration in .NET 6
jkotas
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Oct 4, 2021
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Backport of #59883 to release/6.0
/cc @janvorli
Customer Impact
Methods with huge amount of code can cause crashes at runtime due to not enough memory reserved for the related code heap. This happens when the code heap reservation size is above a minimum reservation (64kB on 32 bit platforms, 512kB on 64 bit platforms) and it is less than 16 bytes smaller than a virtual memory allocation granularity multiple.
Testing
CoreCLR pri 1 tests.
Risk
Low, the fix just enlarges size of memory reservation for code heap in the affected cases by 16 bytes.