[LLVMbugs] [Bug 2460] New: Module dtor segfaults on empty PHI nodes.

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2460

           Summary: Module dtor segfaults on empty PHI nodes.
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: quality-of-implementation
          Severity: normal
          Priority: P2
         Component: Core LLVM classes
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: mdevan.foobar at gmail.com
                CC: llvmbugs at cs.uiuc.edu


If a module has an empty PHI node (a PHI node on which addIncomingBlock() has
not been called), then it segfaults while the module object is destroyed. It
can be reproduced by the attached test program.

Probably can be fixed by modifying User::dropHungoffUses().


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