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A regression test for #115145 #118805

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@saethlin saethlin commented Dec 10, 2023 •
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The example here (reduced from the crate deadpool) used to ICE Miri until the fix in #118871

r? @RalfJung

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Dec 10, 2023
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rustbot commented Dec 10, 2023

The Miri subtree was changed

cc @rust-lang/miri

Some changes occurred to the CTFE / Miri engine

cc @rust-lang/miri

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I swear the tests passed locally, which I thought was odd...

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Oh great this only fails with debug=true

@saethlin saethlin changed the title Remove the interprter's check for project_downcast on unihabited variants Remove the interpreter's check for project_downcast on unihabited variants Dec 10, 2023
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rustbot commented Dec 10, 2023

Could not assign reviewer from: RalfJung.
User(s) RalfJung are either the PR author, already assigned, or on vacation, and there are no other candidates.
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@saethlin saethlin added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Dec 11, 2023
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I assume that diff in the assertion is related to the ICE in the mir-opt test?

That seems to be dataflow_const_prop calling the interpreter on dead code. Maybe ImmTy::offset_ needs to return InterpResult just so that it can return ConstPropNonsense when it is called with uninhabited layout? Obviously there should never be a value of uninhabited type.

Cc @cjgillot , seems like dataflow const prop is unfortunately still doing some things with the interpreter that shouldn't be possible.

@RalfJung RalfJung mentioned this pull request Dec 11, 2023
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@saethlin saethlin force-pushed the project-downcast-uninhabited branch from 81c453d to 3998ee9 Compare December 12, 2023 00:02
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I assume that diff in the assertion is related to the ICE in the mir-opt test?

Yes. I dropped the commit that was making the situation less clear.

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@RalfJung RalfJung mentioned this pull request Dec 12, 2023
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@saethlin saethlin force-pushed the project-downcast-uninhabited branch from 3998ee9 to ace1fa8 Compare December 14, 2023 04:58
@saethlin saethlin changed the title Remove the interpreter's check for project_downcast on unihabited variants A regression test for #115145 Dec 14, 2023
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rustbot commented Dec 14, 2023

Could not assign reviewer from: RalfJung.
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I've turned this PR into adding a regression test per #115145 (comment)

I agree that keeping the assertion is better than removing it.

@saethlin saethlin linked an issue Dec 14, 2023 that may be closed by this pull request
Miri ICE: InvalidProgram(ConstPropNonsense): uninhabited variant in project_downcast #115145
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Ah sorry only saw this now after I submitted rust-lang/miri#3225 which adds a similar test to Miri directly.

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RalfJung commented Dec 14, 2023 •
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I think it'd be good to also have the "futures" test though. Can you add this to tests/pass/async-fn.rs?

That should probably be a Miri PR though.

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Closing in favor of rust-lang/miri#3226

@saethlin saethlin closed this Dec 14, 2023
@saethlin saethlin deleted the project-downcast-uninhabited branch December 14, 2023 23:25
bors added a commit to rust-lang/miri that referenced this pull request Dec 15, 2023
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Auto merge of #3226 - saethlin:deadpool-test, r=RalfJung
e615426 
Add a regression test for rust#115145

Per rust-lang/rust#118805 (comment)
RalfJung pushed a commit to RalfJung/rust that referenced this pull request Dec 17, 2023
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Auto merge of rust-lang#3226 - saethlin:deadpool-test, r=RalfJung
fcb89b3 
Add a regression test for rust#115145

Per rust-lang#118805 (comment)
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Miri ICE: InvalidProgram(ConstPropNonsense): uninhabited variant in project_downcast
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