Comment # 4 on bug 1155271 from Max Lin

(In reply to Andreas Schwab from comment #3)
> I don't see this error in the logfile.

really?

==== cut ===
...
[   90s] ++ IFS='     
[   90s] '
[   90s] ++ for sig_ in 1 2 3 13 15
[   90s] +++ expr 1 + 128
[   90s] ++ eval 'trap '\''Exit 129'\'' 1'
[   90s] +++ trap 'Exit 129' 1
[   90s] ++ for sig_ in 1 2 3 13 15
[   90s] +++ expr 2 + 128
[   90s] ++ eval 'trap '\''Exit 130'\'' 2'
[   90s] +++ trap 'Exit 130' 2
[   90s] ++ for sig_ in 1 2 3 13 15
[   90s] +++ expr 3 + 128
[   90s] ++ eval 'trap '\''Exit 131'\'' 3'
[   90s] +++ trap 'Exit 131' 3
[   90s] ++ for sig_ in 1 2 3 13 15
[   90s] +++ expr 13 + 128
[   90s] ++ eval 'trap '\''Exit 141'\'' 13'
[   90s] +++ trap 'Exit 141' 13
[   90s] ++ for sig_ in 1 2 3 13 15
[   90s] +++ expr 15 + 128
[   90s] ++ eval 'trap '\''Exit 143'\'' 15'
[   90s] +++ trap 'Exit 143' 15
[   90s] ++ trap remove_tmp_ 0
[   90s] + path_prepend_ ../src
[   90s] + test 1 '!=' 0
[   90s] + path_dir_=../src
[   90s] + case $path_dir_ in
[   90s] + abs_path_dir_=/home/abuild/rpmbuild/BUILD/grep-3.1/tests/../src
[   90s] + case $abs_path_dir_ in
[   90s] +
PATH=/home/abuild/rpmbuild/BUILD/grep-3.1/tests/../src:/home/abuild/rpmbuild/BUILD/grep-3.1/src:./src:/usr/local/bin:/usr/bin:/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin
[   90s] + create_exe_shims_ /home/abuild/rpmbuild/BUILD/grep-3.1/tests/../src
[   90s] + case $EXEEXT in
[   90s] + return 0
[   90s] + shift
[   90s] + test 0 '!=' 0
[   90s] + export PATH
[   90s] + echo a
[   90s] + fail=0
[   90s] + grep -E '(.?)(.?)(.?)\3\2\1' in
[   90s] grep: regexec.c:1377: pop_fail_stack: Assertion `num >= 0' failed.
[   90s] ./triple-backref: line 15: 18697 Aborted                 grep -E
'(.?)(.?)(.?)\3\2\1' in > out
[   90s] + fail=1
[   90s] + compare out in
[   90s] + compare_dev_null_ out in
[   90s] + test 2 = 2
[   90s] + test xout = x/dev/null
[   90s] + test xin = x/dev/null
[   90s] + return 2
[   90s] + case $? in
[   90s] + compare_ out in
[   90s] + diff -u out in
[   90s] --- out    2019-10-29 13:28:23.232000000 +0000
[   90s] +++ in    2019-10-29 13:28:23.232000000 +0000
[   90s] @@ -0,0 +1 @@
[   90s] +a
[   90s] + fail=1
[   90s] + Exit 1
[   90s] + set +e
[   90s] + exit 1
[   90s] + exit 1
[   90s] + remove_tmp_
[   90s] + __st=1
[   90s] + cleanup_
[   90s] + :
[   90s] + test '' = yes
[   90s] + cd /home/abuild/rpmbuild/BUILD/grep-3.1/tests
[   90s] + chmod -R u+rwx
/home/abuild/rpmbuild/BUILD/grep-3.1/tests/gt-triple-backref.sCiT
[   90s] + rm -rf
/home/abuild/rpmbuild/BUILD/grep-3.1/tests/gt-triple-backref.sCiT
[   90s] + exit 1
[   90s] XFAIL triple-backref (exit status: 1)