[Bug dap/34457] New: Process output is reported after process termination

https://sourceware.org/bugzilla/show_bug.cgi?id=34457

            Bug ID: 34457
           Summary: Process output is reported after process termination
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: dap
          Assignee: unassigned at sourceware dot org
          Reporter: dmitry.neverov at jetbrains dot com
  Target Milestone: ---

Created attachment 16889
  --> https://sourceware.org/bugzilla/attachment.cgi?id=16889&action=edit
bad.log

Usually the process output is reported before the "exited" and
"terminated" events (good.log), but sometimes it comes after the
termination (bad.log).

I can reproduce it by debugging the program which prints argv to
stdout:

  #include <cstdio>

  int main(int argc, char** argv) {
    for (int i = 1; i < argc; i++) {
      printf("%s", argv[i]);
      printf("\n");
    }
  }

On my machine, the output is reported in the wrong order within 1000 runs.
It happens more often if the machine is under heavy load.

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