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JIT - Fix 'OperIs...' assert during forward substitution - #134962
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch |
This was referenced Sep 30, 2026
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dhartglassMSFT
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Failures are #135031 |
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/ba-g known System net security tests issues |
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/backport to release/11.0 |
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…on (#135069) Backport of #134962 to release/11.0 /cc @dhartglassMSFT ## Customer Impact - [ ] Customer reported - [x] Found internally Assertion during forward substitution on 32 bit architectures. A type-normalizing cast tree can be passed to a method expecting an address expression, hitting an assert or incorrect code generation in release. Found by fuzzing and jitstress-random pipeline. ## Regression - [x] Yes - [ ] No Introduced by #133703, which was also backported to Net11, so backporting this follow-up fix as well. ## Testing Checked in a dedicated unit test from fuzzing. Verified unit test fails without the fix. Also verified that a failing jitstress-random run now passes with the fix. SPMI diffs showed 0 diffs. PR testing. ## Risk Low. The change caused no codegen diffs, and only affects 32 bit targets. Co-authored-by: dhartglassMSFT <dhartglass+github@microsoft.com>
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Assertion on 32 bit targets during forward substitution. The JIT could pass a cast node to code expecting an address expression, because on 32b an int32 is both the address type and the normalizing type for small types in the IR.
Fixes #134818
Also verified that this fixes duplicated issue #134829 (jitstress-random pipeline)
Bug introduced from #133703