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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/94788] [8/9 Regression] Severe regression leading to
 double free in tcache
Date: Wed, 29 Apr 2020 18:32:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94788

Thomas Koenig <tkoenig at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW

--- Comment #33 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
So, the first error in your reduced test case is

=3D=3D8972=3D=3D Invalid free() / delete / delete[] / realloc()
=3D=3D8972=3D=3D    at 0x4C2F3B9: free (vg_replace_malloc.c:540)
=3D=3D8972=3D=3D    by 0x5B2D05: __simulations_uti_MOD_simulations_10
(main_ut.f90:26224)
=3D=3D8972=3D=3D    by 0x5B494E: MAIN__ (main_ut.f90:26298)
=3D=3D8972=3D=3D    by 0x5B49BC: main (main_ut.f90:26288)
=3D=3D8972=3D=3D  Address 0x7ed0510 is 0 bytes inside a block of size 8 fre=
e'd
=3D=3D8972=3D=3D    at 0x4C2F3B9: free (vg_replace_malloc.c:540)
=3D=3D8972=3D=3D    by 0x5B06F9: __simulations_uti_MOD_simulations_10
(main_ut.f90:26263)
=3D=3D8972=3D=3D    by 0x5B494E: MAIN__ (main_ut.f90:26298)
=3D=3D8972=3D=3D    by 0x5B49BC: main (main_ut.f90:26288)
=3D=3D8972=3D=3D  Block was alloc'd at
=3D=3D8972=3D=3D    at 0x4C2E221: malloc (vg_replace_malloc.c:309)
=3D=3D8972=3D=3D    by 0x57D64E: __rt_data_MOD_rt_data_activate (main_ut.f9=
0:24161)
=3D=3D8972=3D=3D    by 0x5AFED1: __simulations_uti_MOD_simulations_10
(main_ut.f90:26250)
=3D=3D8972=3D=3D    by 0x5B494E: MAIN__ (main_ut.f90:26298)
=3D=3D8972=3D=3D    by 0x5B49BC: main (main_ut.f90:26288)

where the invalid free is given in the line

    type(rt_data_t), dimension(1), target :: alt_env

and the first one in

    call simulation%init ([procname1], .true., .true., global, alt_env=3Dal=
t_env)

type(rt_data_t) has a finalizer, rt_global_data_final.

Hm, not tonight, but this is something to go on (I think).=