GNU bug report logs - #21513
assertion error in pop_fail_stack

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Package: grep;

Reported by: Hanno Böck <hanno <at> hboeck.de>

Date: Fri, 18 Sep 2015 16:38:02 UTC

Severity: normal

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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From: Martin Liška <mliska <at> suse.cz>
To: 21513 <at> debbugs.gnu.org
Subject: bug#21513: 
Date: Sat, 18 Jan 2020 15:44:20 +0100

I can confirm that it never finishes on i586.
I would recommend to replace   DEBUG_ASSERT (num >= 0);
which expands to:
  ((num >= 0) ? (void) 0 : __builtin_unreachable ());

into:

  if (num < 0)
    __builtin_abort ();

From GCC documentation:

If control flow reaches the point of the __builtin_unreachable,
the program is undefined.

In this case it loops forever.

Martin
This bug report was last modified 5 years and 175 days ago.

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