Tests failed with GIT_TEST_FAIL_PREREQS and/or GIT_TEST_PROTOCOL_VERSION

Hi folks,

Running the test suit with GIT_TEST_FAIL_PREREQS=1 on master (and next) seem to result in some failures:

  Test Summary Report
 -------------------
  t5300-pack-object.sh (Wstat: 256 Tests: 46 Failed: 2)
  Failed tests: 35-36
  Non-zero exit status: 1
  t7810-grep.sh (Wstat: 256 Tests: 229 Failed: 1)
  Failed test: 160
  Non-zero exit status: 1
  Files=924, Tests=22400, 422 wallclock secs (12.57 usr 2.52 sys +
601.02 cusr 1047.02 csys = 1663.13 CPU)
  Result: FAIL

A quick git-bisect run seems to point back to this commit:

3b1ca60f8f317b483c8c1805ab500ff2b014cbec is the first bad commit
commit 3b1ca60f8f317b483c8c1805ab500ff2b014cbec
Author: Taylor Blau <me@ttaylorr.com>
Date:   Tue Dec 8 17:03:14 2020 -0500

    ewah/ewah_bitmap.c: avoid open-coding ALLOC_GROW()

    'ewah/ewah_bitmap.c:buffer_grow()' is responsible for growing the buffer
    used to store the bits of an EWAH bitmap. It is essentially doing the
    same task as the 'ALLOC_GROW()' macro, so use that instead.

    This simplifies the callers of 'buffer_grow()', who no longer have to
    ask for a specific size, but rather specify how much of the buffer they
    need. They also no longer need to guard 'buffer_grow()' behind an if
    statement, since 'ALLOC_GROW()' (and, by extension, 'buffer_grow()') is
    a noop if the buffer is already large enough.

    But, the most significant change is that this fixes a bug when calling
    buffer_grow() with both 'alloc_size' and 'new_size' set to 1. In this
    case, truncating integer math will leave the new size set to 1, causing
    the buffer to never grow.

    Instead, let alloc_nr() handle this, which asks for '(new_size + 16) * 3
    / 2' instead of 'new_size * 3 / 2'.

    Signed-off-by: Taylor Blau <me@ttaylorr.com>
    Signed-off-by: Junio C Hamano <gitster@pobox.com>

 ewah/ewah_bitmap.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

I also found that a test is failing with protocol V1 set (GIT_TEST_PROTOCOL_VERSION=1)

  Test Summary Report
  -------------------
  t5606-clone-options.sh (Wstat: 256 Tests: 15 Failed: 1)
  Failed test: 14
  Non-zero exit status: 1
  Files=924, Tests=22852, 568 wallclock secs (12.69 usr 2.73 sys +
842.87 cusr 1322.91 csys = 2181.20 CPU)
  Result: FAIL

Which git-bisect is telling me that was caused by the same commit.

Regards, Son Luong.