[review] [gdb/testsuite] Add note to 'Race detection' entry in README

["Tom de Vries (Code Review)" <gerrit@gnutoolchain-gerrit.osci.io>]

Tom de Vries has posted comments on this change.

Change URL: https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/762
......................................................................


Patch Set 1:

> Patch Set 1:
> 
> Out of curiosity, do you have an example of this?  Surely, you must have experienced a concrete case of this happening :)

I ran into this while working on https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/133 , where I would try to match:
...
[Inferior 1 exited ... ]^M
(gdb) [Inferior 2 exited ... ]^M
...

An easier way to reproduce this is:
...
$ cat gdb/testsuite/gdb.base/check-read1.c
#include <stdio.h>

int
main (void)
{
  printf ("hello\n");
  return 0;
}
...
and:
...
$ cat gdb/testsuite/gdb.base/check-read1.exp
standard_testfile

if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
    return -1
}

if ![runto_main] then {
    fail "can't run to main"
    return 0
}

gdb_test "continue &"
...

Where with make check we have:
...
Running src/gdb/testsuite/gdb.base/check-read1.exp ...
FAIL: gdb.base/check-read1.exp: continue & (timeout)

                === gdb Summary ===

# of unexpected failures        1
...
but with make check-read1 we have:
...
Running src/gdb/testsuite/gdb.base/check-read1.exp ...

                === gdb Summary ===

# of expected passes            1
...


-- 
Gerrit-Project: binutils-gdb
Gerrit-Branch: master
Gerrit-Change-Id: I12ef2f0ec35abc5a0221585bf30e5f4f0616aa7c
Gerrit-Change-Number: 762
Gerrit-PatchSet: 1
Gerrit-Owner: Tom de Vries <tdevries@suse.de>
Gerrit-Reviewer: Tom de Vries <tdevries@suse.de>
Gerrit-CC: Simon Marchi <simon.marchi@polymtl.ca>
Gerrit-Comment-Date: Tue, 04 Feb 2020 10:10:26 +0000
Gerrit-HasComments: No
Gerrit-Has-Labels: No
Gerrit-MessageType: comment