[llvm-bugs] [Bug 46262] New: Miscompilation leads to system out to memory

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46262

            Bug ID: 46262
           Summary: Miscompilation leads to system out to memory
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: changochen1 at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

We found a bug that can exhaust the memory of the os.

POC:
---
int a;
int b() {
  int c;
  short d, *e = b();
  switch (c)
    do {
    case 3:
      if (a)
        e = &d;
    case 6:
      e++;
    } while (e);

  return 1;
}
---

Cmdline:
---
clang-11 -cc1 -emit-obj -O3 -o /dev/null -x c poc.c
---

Clang-version:
---
clang version 11.0.0 (https://github.com/llvm/llvm-project.git
641d5ac4d1965990fcf981f153369b038816cd16)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/xxxx/llvm-project/build_clean/bin
---

The compilation exhausts the 256G on my system. Tested on the latest
update-to-date master branch of clang.

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