GNU logs - #22793, boring messages

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Subject: bug#22793: grep -E assertion failure with back references
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Hi,

This is a long standing bug reported to Debian, still present in 2.23.
It was forwarded at some point, but I cannot find any reference, so I'm
reforwarding it.

% echo abc | LANG=C grep -E '(.*)(.*)(.*)\3\2\1'
grep: regexec.c:1401: pop_fail_stack: Assertion `num >= 0' failed.

More info at: https://bugs.debian.org/186568

Regards,

Santiago

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Subject: bug#22793: Acknowledgement (grep -E assertion failure with back
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Subject: bug#22793: grep -E assertion failure with back references
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forcemerge 21513 22793
thanks

On Wed, Feb 24, 2016 at 8:18 AM,  <santiagorr@HIDDEN> wrote:
> Hi,
>
> This is a long standing bug reported to Debian, still present in 2.23.
> It was forwarded at some point, but I cannot find any reference, so I'm
> reforwarding it.
>
> % echo abc | LANG=C grep -E '(.*)(.*)(.*)\3\2\1'
> grep: regexec.c:1401: pop_fail_stack: Assertion `num >= 0' failed.
>
> More info at: https://bugs.debian.org/186568

Correct, this was reported some time ago,
both here and in the upstream glibc bugzilla:

  http://bugs.gnu.org/21513
  https://sourceware.org/bugzilla/show_bug.cgi?id=18986

There is currently an "XFAIL" (expected-to-fail) test in grep's
test suite that exercises precisely this bug:

  git.savannah.gnu.org/cgit/grep.git/tree/tests/triple-backref

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forcemerge 21513 22793

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Subject: bug#22793: grep -E assertion failure with back references
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With recent 'grep' you can work around the problem by configuring 
--with-included-regex. That has some other undesirable properties, though.

This is really a glibc bug 
<https://sourceware.org/bugzilla/show_bug.cgi?id=18986> and the glibc 
patch could be applied to the Debian copy of glibc. Here's the patch:

http://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=5513b40999149090987a0341c018d05d3eea1272

In other words, Debian bug #186568 is really a glibc bug, not a grep 
bug. Can you please fix the Debian bug report accordingly? I'll CC: this 
message there.

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Paul Eggert <eggert@HIDDEN> wrote:

> With recent 'grep' you can work around the problem by configuring 
> --with-included-regex.

Not so. I did a fresh

	./boostrap
	./configure --with-included-regex
	make

and it still core dumps:

$ echo abc | ./src/grep -E  '(.*)(.*)(.*)\3\2\1'
grep: regexec.c:1413: pop_fail_stack: Assertion `((Idx) (num) < ((Idx) -2))' failed.
Aborted (core dumped)

I looked at it in a debugger fs->num before the --fs->num executes looks to
be -1.

Thanks,

Arnold

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unmerge 22793
thanks

I merged this one with 21513 by mistake.

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From: Paul Eggert <eggert@HIDDEN>
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arnold@HIDDEN wrote:
> Paul Eggert <eggert@HIDDEN> wrote:
>
>> With recent 'grep' you can work around the problem by configuring
>> --with-included-regex.
>
> Not so. I did a fresh
>
> 	./boostrap
> 	./configure --with-included-regex
> 	make
>
> and it still core dumps:
>
> $ echo abc | ./src/grep -E  '(.*)(.*)(.*)\3\2\1'
> grep: regexec.c:1413: pop_fail_stack: Assertion `((Idx) (num) < ((Idx) -2))' failed.
> Aborted (core dumped)
>
> I looked at it in a debugger fs->num before the --fs->num executes looks to
> be -1.

Sorry, you're right. I got confused into thinking that grep Bug#22793 and grep 
Bug#21513 are the same bugs, but they're not. I have unmerged them.

This is still a glibc bug, not a grep bug; it's just that we don't have a fix.

grep Bug#21513 is indeed fixed by configuring --with-included-regex.

Message sent to bug-grep@HIDDEN:

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> This is still a glibc bug, not a grep bug; it's just that we don't have a fix.

I finally got around to finding the correct glibc bug report for this
grep bug. Here it is:

https://sourceware.org/bugzilla/show_bug.cgi?id=11053

I added a comment to the glibc bug, saying that it causes grep Bug#22793
<https://bugs.gnu.org/22793>.

Paolo Bonzini reported the glibc bug in 2009 and is the current
assignee. I think he's pretty busy doing other things. It'd be nice if
someone could fix the glibc bug (or at least, fix it in Gnulib), though
I suspect that any fix will not be trivial.

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merge 22793 32806

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Subject: 34238 is the same as 22793
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Organization: UCLA Computer Science Department
Message-ID: <60adfc6e-d121-2119-2edb-cfdcc9d27b17@HIDDEN>
Date: Wed, 30 Jan 2019 19:22:22 -0800
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merge 22793 34238

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To: control <at> debbugs.gnu.org
From: Paul Eggert <eggert@HIDDEN>
Subject: merge 42946 into 22793
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merge 22793 42946

Last modified: Mon, 21 Sep 2020 20:00:02 UTC

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