I'm running all the tests (except for vim - I think that dislikes my
use of urxvt) and I wasn't intending to look at the results until
later (this build is experimental, to see how much, if any, damage
is caused by various potential BLFS updates).  But for grep 'make
check' unexpectedly failed (status 1) after an XFAIL.

XFAIL triple-backref (exit status: 1)

============================================================================
Testsuite summary for GNU grep 3.1
============================================================================
# TOTAL: 109
# PASS:  88
# SKIP:  19
# XFAIL: 1
# FAIL:  0
# XPASS: 1
# ERROR: 0
============================================================================
See tests/test-suite.log
Please report to bug-g...@gnu.org
============================================================================
make[3]: *** [Makefile:1743: test-suite.log] Error 1
make[3]: Leaving directory '/building/grep-3.1/tests'
make[2]: *** [Makefile:1851: check-TESTS] Error 2
make[1]: *** [Makefile:2685: check-am] Error 2
make: *** [Makefile:1301: check-recursive] Error 1

 The voluminous output in test-suite.log seems to be the same as
what I logged from stdout and stderr, and looking closely I now
notice:

grep: regexec.c:1359: pop_fail_stack: Assertion `num >= 0' failed.
./triple-backref: line 15:  8025 Aborted                 (core dumped) grep -E 
'(.?)(.?)(.?)\3\2\1' in > out
+ fail=1

Looking at the log from the same version (3.1) when I last built it,
the main tests had two XFAIL, backref-alt and triple-backref but
WITHOUT an assertion failure.

make[3]: Entering directory '/building/grep-3.1/tests'
============================================================================
Testsuite summary for GNU grep 3.1
============================================================================
# TOTAL: 109
# PASS:  88
# SKIP:  19
# XFAIL: 2
# FAIL:  0
# XPASS: 0
# ERROR: 0
============================================================================
make[3]: Leaving directory '/building/grep-3.1/tests'
Making check in gnulib-tests

and in gnulib-tests on that build 134 tests passed and 7 were
skipped, but on today's build gnulib is not mentioned in the test
output.

Smells like a glibc-2.28 problem.

ĸen
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