tests: big-match: disable OOM-provoking subtest

* tests/big-match: Our application of this regexp '^.*x\(\)\1'
to a file containing a single matching line of length 2GiB+2
would cause inordinate memory consumption (over 100GB) via
regexec.c, but no leak.  That would cause disruption on most
systems, so remove this subtest.  Reported by Assaf Gordon.

1 files changed, 4 insertions, 1 deletions

diff --git a/tests/big-match b/tests/big-match
index 20928cf7..0da97316 100755
--- a/tests/big-match
+++ b/tests/big-match
@@ -11,7 +11,10 @@ skip_diagnostic=
 
 # These two patterns catch different kinds of
 # failures due to internal integer overflows.
-for pattern in '^.*' '^.*x\(\)\1'; do
+# However, the second one, '^.*x\(\)\1', provokes
+# so much memory consumption via regexec.c that it renders
+# some systems unusable.
+for pattern in '^.*'; do
   diagnostic=$(LC_ALL=C grep -a "$pattern" 2G-plus-2 2>&1 >/dev/null)
   status=$?