[LLVMbugs] [Bug 9550] New: Crash when calling addRequiredTransitive<LoopInfo> from a ModulePass.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9550

           Summary: Crash when calling addRequiredTransitive<LoopInfo>
                    from a ModulePass.
           Product: libraries
           Version: 2.9
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Core LLVM classes
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: ludw1g.m3i3r at gmail.com
                CC: llvmbugs at cs.uiuc.edu


When a ModulePass has addRequiredTransitive<LoopInfo>(), a segfault occurs.

The problem is in MPPassManager::addLowerLevelRequiredPass().
The call to FPP->add(RequiredPass) may delete the RequiredPass object (see
PMTopLevelManager::schedulePass).
Five lines down, the reference to the now deleted object is passed to
PMTopLevelManager::setLastUser().

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