[jdk8u-dev] RFR: 8360869: jcstress is able to crash jdk8 on aarch64 with jfr on [v6]

[Jiří Vaněk]

> We are seeing rare crashes in jcstress with jdk8 on aarch64 with jfron. Those crashes are real, however we were not able to reproduce with builds on gcc 5 and up. The real culprint was not found. but gcc version on aarch64 should be checked.  Ideal version seems 7, but I'm not that bold.
> 
> I think this change must be accompanied by regenerating  `generated-configure` but am not sure with process on it.

Jiří Vaněk has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - regenerated generated-configure by self built autoconf 2.69
   
   Skipping about 50 hunks like:
   @@ -50158,7 +50167,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
    /* end confdefs.h.  */
   
    int
   -main (void)
   +main ()
    {
    return 0;
      ;
 - Improved error message
 - Moved compiler version result to earlier stage
 - 8360869: jcstress is able to crash jdk8 on aarch64 with jfr on

-------------

Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/697/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/697/files/78ee959b..99ce7cdf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=697&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=697&range=04-05

  Stats: 3338 lines in 69 files changed: 2562 ins; 235 del; 541 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/697.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/697/head:pull/697

PR: https://git.openjdk.org/jdk8u-dev/pull/697