[all-commits] [llvm/llvm-project] d9ce33: [libfuzzer] Prevent MSan false positive when print...

[Thurston Dang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d9ce33a0eea701719651dafbf88deae0ece96976
      https://github.com/llvm/llvm-project/commit/d9ce33a0eea701719651dafbf88deae0ece96976
  Author: Thurston Dang <thurston at google.com>
  Date:   2024-05-10 (Fri, 10 May 2024)

  Changed paths:
    M compiler-rt/lib/fuzzer/FuzzerDriver.cpp

  Log Message:
  -----------
  [libfuzzer] Prevent MSan false positive when printing log with -jobs (#91679)

libfuzzer's -jobs option will, depending on the number of CPUs, spin up
a
WorkerThread and end up printing the log file using CopyFileToErr.
This leads to an MSan false positive. This patch disables the MSan
interceptor checks,
similarly to other instances in https://reviews.llvm.org/D48891

Side-note: this false positive issue first appeared when printf()
was replaced by puts() (90b4d1bcb20180c591385131b12fa90d2e4860b1).
The interceptor check was always present; however, MSan does not
check_printf by default.



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