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Unused move causes a crash #3878

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Unused move causes a crash#3878
Labels
A-codegenArea: Code generationE-easyCall for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.I-crashIssue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.
Milestone
0.5

Description

@jruderman
jruderman
opened on Oct 27, 2012
fn main()
{
    let y = ~1;
    move y;
}

a.out(43383,0x10065f000) malloc:
*** error for object 0x7ffed14144d0: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug

Activity

  1. nikomatsakis commented on Oct 27, 2012

    @nikomatsakis
    nikomatsakis
    on Oct 27, 2012
    Contributor

    I think the problem is that, when translating expr_unary_move, if the dest is "ignore", we drop the lvalue but do not zero it.

  2. vertexclique commented on Oct 30, 2012

    @vertexclique
    vertexclique
    on Oct 30, 2012
    Contributor

    Which fn we use instead of drop_val( lvalue ) in "Ignore" case?

  3. vertexclique
    added a commit that references this issue on Oct 30, 2012

    testcase added for rust-lang#3878

    1dc4d02
  4. catamorphism
    added a commit that references this issue on Nov 1, 2012

    Add test case for #3878, which didn't get merged somehow

    9d276b1

  5. catamorphism commented on Nov 1, 2012

    @catamorphism
    catamorphism
    on Nov 1, 2012
    Contributor

    This was merged in already, but I also added the test case:

    9d276b1

  6. catamorphism
    closed this as completedon Nov 1, 2012

  7. vertexclique commented on Nov 1, 2012

    @vertexclique
    vertexclique
    on Nov 1, 2012
    Contributor

    @catamorphism I see him there src/test/run-pass/unused-move.rs

  8. RalfJung
    added a commit that references this issue on Sep 17, 2024

    Auto merge of rust-lang#3878 - rust-lang:rustup-2024-09-11, r=RalfJung

    59835ae
  9. U007D
    added a commit that references this issue on Aug 21, 2026

    Merge rust-lang#3878

    33c364b
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    A-codegenArea: Code generationE-easyCall for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.I-crashIssue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.

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