[llvm-bugs] [Bug 44382] New: opt -run-twice raises segmentation fault

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44382

            Bug ID: 44382
           Summary: opt -run-twice raises segmentation fault
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Transformation Utilities
          Assignee: unassignedbugs at nondot.org
          Reporter: juneyoung.lee at sf.snu.ac.kr
                CC: llvm-bugs at lists.llvm.org

```
$ cat aa.ll 
define void @f() {
  ret void
}

$ opt aa.ll -run-twice
WARNING: You're attempting to print out a bitcode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bitcode first-hand, you
can force output with the `-f' option.

Stack dump:
0.      Program arguments: /Users/juneyounglee//llvm/build/bin/opt ./aa.ll
-run-twice 
0  opt                      0x000000010e892835
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
1  opt                      0x000000010e891488 llvm::sys::RunSignalHandlers() +
248
2  opt                      0x000000010e892e7c SignalHandler(int) + 268
3  libsystem_platform.dylib 0x00007fff708b342d _sigtramp + 29
4  opt                      0x000000010e0cea09 forEachUser(llvm::Value const*,
llvm::SmallPtrSet<llvm::Value const*, 32u>&, llvm::function_ref<bool
(llvm::Value const*)>) + 41
5  libdyld.dylib            0x00007fff706ba7fd start + 1
6  libdyld.dylib            0x0000000000000003 start + 18446603338630060039
Segmentation fault: 11
```

This seems to be relevant with whether the input module has ever been updated
by passes.

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