GNU bug report logs - #33069
FYI: test tweak (one still fails) and gnulib update

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Jim Meyering <jim <at> meyering.net>
To: bug-grep <at> gnu.org, 27838 <at> debbugs.gnu.org
Subject: FYI: test tweak (one still fails) and gnulib update
Date: Tue, 16 Oct 2018 17:21:37 -0700

[Message part 1 (text/plain, inline)]

Grep's backref-alt test still gets an assertion failure when using
glibc-2.27-32.fc28 (and many others), but I have reduced it to
something much more readable in the attached. I've also updated to
latest gnulib.

This demonstrates that the reduced regexp triggers the same error, in
both grep and sed:

$ printf z > in && LC_ALL=C sed -r 's/(()x)|\2//' in
sed: regexec.c:1342: pop_fail_stack: Assertion `num >= 0' failed.
zsh: abort (core dumped)  LC_ALL=C sed -r 's/(()x)|\2//' in
[Exit 134 (ABRT)]

$ printf z > in && LC_ALL=C grep -E '(()x)|\2' in
grep: regexec.c:1342: pop_fail_stack: Assertion `num >= 0' failed.
zsh: abort (core dumped)  LC_ALL=C grep --color=auto -E '(()x)|\2' in
[Exit 134 (ABRT)]

[0001-grep-test-and-gnulib.diff (application/octet-stream, attachment)]

Message #10 received at 33069-done <at> debbugs.gnu.org (full text, mbox):

From: Jim Meyering <jim <at> meyering.net>
To: 33069-done <at> debbugs.gnu.org, 27838 <at> debbugs.gnu.org
Subject: Re: bug#33069: FYI: test tweak (one still fails) and gnulib update
Date: Sun, 28 Oct 2018 16:18:05 -0700

On Tue, Oct 16, 2018 at 5:23 PM Jim Meyering <jim <at> meyering.net> wrote:
> Grep's backref-alt test still gets an assertion failure when using
> glibc-2.27-32.fc28 (and many others), but I have reduced it to
> something much more readable in the attached. I've also updated to
> latest gnulib.
>
> This demonstrates that the reduced regexp triggers the same error, in
> both grep and sed:
>
> $ printf z > in && LC_ALL=C sed -r 's/(()x)|\2//' in
> sed: regexec.c:1342: pop_fail_stack: Assertion `num >= 0' failed.
> zsh: abort (core dumped)  LC_ALL=C sed -r 's/(()x)|\2//' in
> [Exit 134 (ABRT)]
>
> $ printf z > in && LC_ALL=C grep -E '(()x)|\2' in
> grep: regexec.c:1342: pop_fail_stack: Assertion `num >= 0' failed.
> zsh: abort (core dumped)  LC_ALL=C grep --color=auto -E '(()x)|\2' in
> [Exit 134 (ABRT)]

FYI, this no longer fails with glibc-2.28-9.fc29
I'm marking my 33069 as done.

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