JIT: Assertion failed '!"Missing flags on tree"' during 'Assertion prop' for recently added RuntimeHelpers.CreateSpan uses

[jakobbotsch]

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).

fail-39322.zip

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Issue Details

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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 an SPMI context that hits it on recent JIT commits (e.g. 3f5210d).

fail-39322.zip

Author:	jakobbotsch
Assignees:	-
Labels:	area-CodeGen-coreclr
Milestone:	-

[SingleAccretion]

Probably #80622 will fix this by virtue of using a non-CONST handle for this data.

[jakobbotsch]

@EgorBo Can you double check with the attached SPMI context?

[EgorBo]

Just checked, the assert is gone with the patch. @jakobbotsch thanks for the SPMI context it saved an hour or two🙂