Static slices create corrupted iterators

[drrb]

Original bug report.

Version: 0.7
Platform: OSX (installed via Homebrew)

Running rust help displays an error.

$ rust help
The rust tool is a convenience for managing rust source code.
It acts as a shortcut for programs of the rust tool chain.

Usage:  rust <command> [arguments]

The commands are:

    build   compile rust source files
    run     build an executable, and run it
    test    build a test executable, and run it
    doc     generate documentation from doc comments
    pkg     download, build, install rust packages
    sketch  run a rust interpreter
    help    show detailed usage of a command
rust(99583,0x108ce3000) malloc: *** mmap(size=7522747388523884544) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
Abort trap: 6

Updated information (by @alexcrichton, 7-28-2013)

The problem for this was patched over in #8086, the behavior seen was that the static slice of Command structs would cause problems with iteration. It was determined that using iter() caused problems while not using the method and iterating directly worked just fine.

[Aatch]

😕 WAT

[alexcrichton]

I think this has to do with the static COMMANDS variable. This may have to do with some linkage thing somewhere. If you change the global to static mut (which changes how linkage stuff is set), then this runs just fine. I originally thought it may be the layout, but perhaps we're telling LLVM things about statics which aren't necessarily correct?

[agarie]

Any idea of what might be causing this? I'm having the same problem. :(

[nicholasguyett]

I can confirm the exact same error. Same platform and version.

[arturmazurek]

Happens also when built from source on Release+Asserts build. What's interesting - didn't happen on Debug+Asserts build (./configure --enable-debug --disable-optimize{,-cxx,-llvm}).

[alexcrichton]

I edited the title and the description to reflect the current state of affairs.

[cypher]

fe9929e seems to have fixed this, installing Rust via Homebrew using brew install rust --HEAD && rust no longer crashes for me.

[arturmazurek]

👍 doesn't crash for me either

[thestinger]

It's a workaround, the issue is still unfixed.