[LLVMbugs] [Bug 23779] New: Segfault when globals reference constants when targeting OSX

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23779

            Bug ID: 23779
           Summary: Segfault when globals reference constants when
                    targeting OSX
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: alex at crichton.co
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The following IR will cause `llc` to segfault when executed with no extra
arguments:


    target triple = "x86_64-apple-darwin"                                      
    @a = external global i8                   
    @b = internal unnamed_addr constant i8* @a
    @c = global i8** @b                       

Note that if the IR instead targets 64-bit linux the segfault does not happen.

the backtrace given is:

0  llc             0x00000000021f4c36
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 44
1  llc             0x00000000021f4f4b
2  llc             0x00000000021f3a4c
3  libpthread.so.0 0x00007f7ad0a59340
4  llc             0x0000000000dde9b0
5  llc             0x0000000001894131
6  llc             0x00000000018947b4
7  llc             0x000000000189486a
llvm::AsmPrinter::EmitGlobalConstant(llvm::Constant const*) + 96
8  llc             0x000000000188c853
llvm::AsmPrinter::EmitGlobalVariable(llvm::GlobalVariable const*) + 3241
9  llc             0x000000000188f3cf
llvm::AsmPrinter::doFinalization(llvm::Module&) + 237
10 llc             0x00000000021372f1
llvm::FPPassManager::doFinalization(llvm::Module&) + 83
11 llc             0x00000000021376eb
12 llc             0x0000000002137c1d
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 249
13 llc             0x0000000002137e57
llvm::legacy::PassManager::run(llvm::Module&) + 39
14 llc             0x0000000000c3fea5
15 llc             0x0000000000c3ef50 main + 242
16 libc.so.6       0x00007f7acfa58ec5 __libc_start_main + 245
17 llc             0x0000000000c3bff9
Stack dump:
0.      Program arguments: ./Debug+Asserts/bin/llc
/home/alex/bugpoint-reduced-simplified.ll 
zsh: segmentation fault (core dumped)  ./Debug+Asserts/bin/llc
~/bugpoint-reduced-simplified.ll

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