[LLVMbugs] [Bug 8106] New: clang fails with "AbstractTypeUser not in user list!"

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8106

           Summary: clang fails with "AbstractTypeUser not in user list!"
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Core LLVM classes
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: gonsolo at gmail.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=5468)
 --> (http://llvm.org/bugs/attachment.cgi?id=5468)
Reduced bugpoint testcase

clang fails to compile only sometimes with the following error message:

clang: /home/xxx/src/llvm/lib/VMCore/Type.cpp:1012: void
llvm::Type::removeAbstractTypeUser(llvm::AbstractTypeUser *) const: Assertion
`i != 0 && "AbstractTypeUser not in user list!"' failed.
Stack dump:
0.    Program arguments: /home/xxx/bin/clang -cc1 -triple i386-pc-linux-gnu -S
-disable-free -main-file-name bugpoint-output.bc -mrelocation-model static
-mdisable-fp-elim -mconstructor-aliases -target-cpu pentium4 -resource-dir
/home/xxx/lib/clang/2.8 -ferror-limit 19 -fmessage-length 177 -fgnu-runtime
-fdiagnostics-show-option -fcolor-diagnostics -o /tmp/cc-2s6iXw.s -x ir
bugpoint-output.bc 
clang: error: clang frontend command failed due to signal 6 (use -v to see
invocation)

Attached is the reduced bugpoint output.

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