[Bug 2036420] Re: tzset generates ThreadSanitizer warnings if TZ not set

[Simon Chopin]

Might be a false positive. AFAICT this warns about writing to old_tz,
which AFAICT is always dealt with under the tzset_lock except in
__libc_tzset_freemem which I'm guessing is only ran when the main thread
exits.

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Title:
  tzset generates ThreadSanitizer warnings if TZ not set

Status in glibc package in Ubuntu:
  New

Bug description:
  A program that calls tzset (e.g. via mktime) from multiple threads
  will generate ThreadSanitizer warnings, but only if the environment
  variable TZ is not set. Please see attached example.

  Not sure if it is a glibc bug or a limitation in ThreadSanitizer.

  $ lsb_release -rd
  Description:	Ubuntu 22.04.3 LTS
  Release:	22.04

  $ apt-cache policy libc6
  libc6:
    Installed: 2.35-0ubuntu3.1
    Candidate: 2.35-0ubuntu3.1
    Version table:
   *** 2.35-0ubuntu3.1 500
          500 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       2.35-0ubuntu3 500
          500 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages

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