[LLVMbugs] [Bug 22207] New: Segfault/invalid free in llc for R600

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22207

            Bug ID: 22207
           Summary: Segfault/invalid free in llc for R600
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: pablo.barrio at arm.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Unit test llvm.dev.src/test/CodeGen/R600/infinite-loop-evergreen.ll segfaults.

If a new llvm is built with the first llvm, then the same unit test segfaults
with a glibc invalid pointer error.

All builds are in Release mode.

Steps to reproduce the error:

1. Build LLVM r225260 and Clang r225247 into directory e.g. obj1
2. Build a new LLVM/Clang with the previously built compiler into e.g. obj2
3. obj1/bin/llc -march=r600 -mcpu=cypress
llvm.dev.src/test/CodeGen/R600/infinite-loop-evergreen.ll
4. obj2/bin/llc -march=r600 -mcpu=cypress
llvm.dev.src/test/CodeGen/R600/infinite-loop-evergreen.ll

Step 3 segfaults, Step 4 segfaults and shows the glibc error.

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