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From: "manfred99 at gmx dot ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/113793] New: malloc abort on character allocate with
 source argument
Date: Tue, 06 Feb 2024 23:28:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113793

            Bug ID: 113793
           Summary: malloc abort on character allocate with source
                    argument
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: manfred99 at gmx dot ch
  Target Milestone: ---

Allocating an allocatable character array, I get a malloc error
when the source argument is not properly padded:

      CHARACTER*30,allocatable :: a(:),b(:)
      ALLOCATE(a(100),source=3D" ")
      ALLOCATE(b(100),source=3D" ")
      END

yields:
malloc(): corrupted top size


When doing a lame indirection:
      CHARACTER*30,allocatable :: a(:),b(:)
      CHARACTER*30 :: c=3D" "
      ALLOCATE(a(100),source=3Dc)
      ALLOCATE(b(100),source=3Dc)
      END

everything is fine.
I don't know whether this is mandated by the standard, but the error
message is not very user friendly and hard to grasp.

I would have expected that the source argument is automatically padded
as with variable assignments and function call arguments.=