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JIT: Assertion failed '!"Missing flags on tree"' during 'Assertion prop' for recently added RuntimeHelpers.CreateSpan uses #80632
Description
libraries-jitstress jobs are failing with this assert, e.g. https://dev.azure.com/dnceng-public/public/_build/results?buildId=136796&view=ms.vss-test-web.build-test-results-tab&runId=2975122&resultId=191688&paneView=debug.
From bisection I think it is not exposed by a JIT change and we are hitting it now after #79461 (I bisected with an SPMI context, and even old JITs hit the assert).
Attached a win-x64 SPMI context that hits it on recent JIT commits (e.g. 3f5210d).
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[-]JIT: Assertion failed '!"Missing flags on tree"' during 'Assertion prop'[/-][+]JIT: Assertion failed '!"Missing flags on tree"' during 'Assertion prop' for recently added RuntimeHelpers.CreateSpan uses[/+]SingleAccretion commentedon Jan 13, 2023
Probably #80622 will fix this by virtue of using a non-
CONSThandle for this data.jakobbotsch commentedon Jan 13, 2023
@EgorBo Can you double check with the attached SPMI context?
EgorBo commentedon Jan 14, 2023
Just checked, the assert is gone with the patch. @jakobbotsch thanks for the SPMI context it saved an hour or two🙂