[all-commits] [llvm/llvm-project] ce52e0: tsan: fix another latent race size bug in test

[Dmitry Vyukov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ce52e0339f0ae1e7ac915f041b3f4d32081f648e
      https://github.com/llvm/llvm-project/commit/ce52e0339f0ae1e7ac915f041b3f4d32081f648e
  Author: Dmitry Vyukov <dvyukov at google.com>
  Date:   2021-07-30 (Fri, 30 Jul 2021)

  Changed paths:
    M compiler-rt/test/tsan/Linux/double_race.cpp

  Log Message:
  -----------
  tsan: fix another latent race size bug in test

The test contains a race in memset.
The size of reported race depends on how the accessed
memory range split into granules inside of tsan runtime.
The test used to report access of size 8, because presumably
the buffer ended up being aligned to 8 bytes. But after
some unrelated changes this test started to report accesses
of size 1 (presumably .data layout changed), which makes
the test fail.
Guarantee alignment of the buf object explicitly.

Reviewed By: melver

Differential Revision: https://reviews.llvm.org/D107149