[all-commits] [llvm/llvm-project] 49a7f3: [CAS] Fix assertion failure when opening CAS with ...

[Steven Wu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 49a7f37154df354167ed3420cbee00a305e0316f
      https://github.com/llvm/llvm-project/commit/49a7f37154df354167ed3420cbee00a305e0316f
  Author: Steven Wu <stevenwu at apple.com>
  Date:   2026-04-17 (Fri, 17 Apr 2026)

  Changed paths:
    M llvm/lib/CAS/MappedFileRegionArena.cpp
    A llvm/test/tools/llvm-cas/mapping-size-too-small.test

  Log Message:
  -----------
  [CAS] Fix assertion failure when opening CAS with smaller mapping size (#192565)

When opening an existing large CAS using a smaller requested mapping
size, the file size can be smaller than capacity while holding only a
shared lock. Replace the assertion with a graceful lock upgrade to
exclusive before resizing the file.



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