Assertion failing in constructAbstractSubprogramScopeDIE if compiled with -g

[farcaller]

Assertion failed: (ScopeDIE), function constructAbstractSubprogramScopeDIE
file /Users/rustbuild/src/rust-buildbot/slave/nightly-mac/build/src/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp, line 534.

What interesting is that it fails with rust nightly but works ok with my local rust configuration:

% /Users/farcaller/Downloads/rust-nightly-x86_64-apple-darwin/bin/rustc --version
rustc 0.11.0-pre-nightly (6d8342f 2014-06-14 17:51:49 +0000)
host: x86_64-apple-darwin
% ~/.local/bin/rustc --version
rustc 0.11.0-pre (6d8342f 2014-06-14 17:51:49 +0000)
host: x86_64-apple-darwin

Update: those timestamps look to same, that's probably not a coincidence :-) anyways, my local rustc is surely built from 6d8342f.

My rust was configured as

./configure --prefix=/Users/farcaller/.local --enable-clang --disable-docs --disable-optimize --disable-optimize-cxx --disable-optimize-llvm --disable-verify-install

[farcaller]

Stack trace:

* thread #2: tid = 0x48de0a, 0x00007fff83546866 libsystem_kernel.dylib`__pthread_kill + 10, stop reason = signal SIGABRT
  * frame #0: 0x00007fff83546866 libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff865e135c libsystem_pthread.dylib`pthread_kill + 92
    frame #2: 0x00000001016b3b16 librustc-d252d482-0.11.0-pre.dylib`abort + 22
    frame #3: 0x00000001016b3af1 librustc-d252d482-0.11.0-pre.dylib`__assert_rtn + 81
    frame #4: 0x000000010103c2fd librustc-d252d482-0.11.0-pre.dylib`llvm::DwarfDebug::constructAbstractSubprogramScopeDIE(llvm::DwarfCompileUnit&, llvm::LexicalScope*) + 349
    frame #5: 0x0000000101042ab9 librustc-d252d482-0.11.0-pre.dylib`llvm::DwarfDebug::endFunction(llvm::MachineFunction const*) + 1449
    frame #6: 0x00000001010234ad librustc-d252d482-0.11.0-pre.dylib`llvm::AsmPrinter::EmitFunctionBody() + 4637
    frame #7: 0x0000000100c3270a librustc-d252d482-0.11.0-pre.dylib`llvm::ARMAsmPrinter::runOnMachineFunction(llvm::MachineFunction&) + 362
    frame #8: 0x000000010112c41d librustc-d252d482-0.11.0-pre.dylib`llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 125
    frame #9: 0x0000000101649bab librustc-d252d482-0.11.0-pre.dylib`llvm::FPPassManager::runOnFunction(llvm::Function&) + 347
    frame #10: 0x0000000101649e4b librustc-d252d482-0.11.0-pre.dylib`llvm::FPPassManager::runOnModule(llvm::Module&) + 59
    frame #11: 0x000000010164a429 librustc-d252d482-0.11.0-pre.dylib`llvm::legacy::PassManagerImpl::run(llvm::Module&) + 1081
    frame #12: 0x000000010164a83d librustc-d252d482-0.11.0-pre.dylib`llvm::legacy::PassManager::run(llvm::Module&) + 13
    frame #13: 0x0000000100a71e23 librustc-d252d482-0.11.0-pre.dylib`LLVMRustWriteOutputFile + 307
    frame #14: 0x00000001008d71dd librustc-d252d482-0.11.0-pre.dylib`back::link::write_output_file::he9e93a5b7a268ff2wKf::v0.11.0.pre + 141
    frame #15: 0x00000001008dea30 librustc-d252d482-0.11.0-pre.dylib`back::link::write::run_passes::closure.91419 + 240
    frame #16: 0x00000001008d976c librustc-d252d482-0.11.0-pre.dylib`back::link::write::run_passes::hbb695e52f514c879MMf::v0.11.0.pre + 9356
    frame #17: 0x0000000100a20e01 librustc-d252d482-0.11.0-pre.dylib`driver::driver::phase_5_run_llvm_passes::closure.97852 + 97
    frame #18: 0x0000000100989c7a librustc-d252d482-0.11.0-pre.dylib`driver::driver::phase_5_run_llvm_passes::h7e7bf09cf59529cafxv::v0.11.0.pre + 490
    frame #19: 0x000000010097f380 librustc-d252d482-0.11.0-pre.dylib`driver::driver::compile_input::hf1998b432ab27ab2gbv::v0.11.0.pre + 7456
    frame #20: 0x0000000100a406ee librustc-d252d482-0.11.0-pre.dylib`driver::run_compiler::hb2048e6d930cfe5fOSx::v0.11.0.pre + 9662
    frame #21: 0x0000000100a3e076 librustc-d252d482-0.11.0-pre.dylib`driver::main_args::closure.98543 + 70
    frame #22: 0x0000000100a58397 librustc-d252d482-0.11.0-pre.dylib`driver::monitor::closure.99633 + 199
    frame #23: 0x0000000100a535bb librustc-d252d482-0.11.0-pre.dylib`task::TaskBuilder::try::closure.99396 + 75
    frame #24: 0x00000001000459ac libnative-1fb5e2c0-0.11.0-pre.dylib`task::spawn_opts::closure.7247 + 76
    frame #25: 0x000000010327b928 librustrt-d8560cb2-0.11.0-pre.dylib`task::Task::run::closure.5244 + 56
    frame #26: 0x00000001032f1c2c librustrt-d8560cb2-0.11.0-pre.dylib`rust_try + 12
    frame #27: 0x000000010327e23a librustrt-d8560cb2-0.11.0-pre.dylib`unwind::try::habea3eb6fbe31bfdLCd::v0.11.0.pre + 74
    frame #28: 0x000000010327b7f5 librustrt-d8560cb2-0.11.0-pre.dylib`task::Task::run::h31070b5f512029c7XSc::v0.11.0.pre + 101
    frame #29: 0x000000010004581b libnative-1fb5e2c0-0.11.0-pre.dylib`task::spawn_opts::closure.7219 + 267
    frame #30: 0x000000010327d879 librustrt-d8560cb2-0.11.0-pre.dylib`thread::thread_start::hfa0dfbb777e33e5dmad::v0.11.0.pre + 41
    frame #31: 0x00007fff865e0899 libsystem_pthread.dylib`_pthread_body + 138
    frame #32: 0x00007fff865e072a libsystem_pthread.dylib`_pthread_start + 137

[michaelwoerister]

Thanks for the report! I'll see if I can reproduce it.

[farcaller]

I've rebuilt my local rustc with following:

./configure --prefix=/Users/farcaller/.local --enable-clang --disable-docs --disable-verify-install

and strangely enough the problem seems to be fixed for both local & nightly installs (well, I suppose nightly actually uses libs from local 😄 )

[michaelwoerister]

That's possible, I don't know the intricacies of the build system too well :) I'll close the issue. If you come across the assertion again, we can always reopen.

[farcaller]

For now it's known broken on a clean host install of rust-nightly. Can you please reopen? I'll confirm if that will happen with next nightly build.

[michaelwoerister]

Woops, thanks @huonw.

[farcaller]

All tests are done on a clean linux/x86_64 images:

• nightly package 0.11.0-pre-nightly (6d8342f 2014-06-14 17:51:49 +0000) – fails
• compiled from 6d8342f with ./configure --disable-docs --disable-verify-install – fails
• compiled from 5abf794 (latest HEAD) – fails

[farcaller]

A bit more details, now that I have rustc failing in debug configuration.

In constructAbstractSubprogramScopeDIE call, Scope dumps as:

(gdb) call Scope->dump(0)
DFSIn: 0 DFSOut: 0
!{i32 786478, metadata <badref>, metadata <badref>, metadata !"get_task_stack_pointer", metadata !"get_task_stack_pointer", metadata !"_ZN4zinc3hal9cortex_m35sched22get_task_stack_pointerE", i32 43, metadata <badref>, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, null, metadata <badref>, null, metadata <badref>, i32 43} ; [ DW_TAG_subprogram ] [line 43] [def] [get_task_stack_pointer]

Abstract Scope
  Children ...
  DFSIn: 0 DFSOut: 0
  !{i32 786443, metadata <badref>, metadata <badref>, i32 43, i32 39, i32 0, i32 473} ; [ DW_TAG_lexical_block ] [/tmp/zinc/src/hal/cortex_m3/sched.rs]

  Abstract Scope
    Children ...
    DFSIn: 0 DFSOut: 0
    !{i32 786443, metadata <badref>, metadata <badref>, i32 45, i32 2, i32 0, i32 474} ; [ DW_TAG_lexical_block ] [/tmp/zinc/src/hal/cortex_m3/sched.rs]

    Abstract Scope

FWIW, this is the definition of get_task_stack_pointer:

/// Returns task stack pointer (PSP).
#[cfg(not(test))]
#[inline(always)]
pub fn get_task_stack_pointer() -> u32 {
  let mut val: u32;
  unsafe { asm!("mrs $0, psp" : "=r"(val)) };
  val
}

[farcaller]

This might also be of interest (it points to here).

(gdb) call Sub.dump()
[ DW_TAG_subprogram ] [line 43] [def] [get_task_stack_pointer]