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From: "Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp-workers AT delorie DOT com]" <djgpp-workers AT delorie DOT com>
Date: Wed, 21 Nov 2018 15:33:31 +0300
Message-ID: <CAA2C=vC30DQkZ95EESRDMVVXfML_741-V=zKCHtfRXfYM1tXgQ@mail.gmail.com>
Subject: Re: memalign broken (again)
To: djgpp-workers AT delorie DOT com
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On 11/21/18, Peter Ross <pross AT xvid DOT org> wrote:
> hi,
>
> djgpp memalign still fails when:
>
> 	1. alignment is >= 16 bytes
> 	2. some sequence of memory allocations have already occured.
>
> the test case below is reproducible with djgpp cvs and 2.05+nmemalign.patch
> (patch was found here:
> https://aur.archlinux.org/cgit/aur.git/tree/nmemalign.patch?h=dosbox-djcrx)
>
> tested using freedos 1.2 on physical hardware.
>
> ---
> #include <stdio.h>
> #include <malloc.h>
>
> #define TEST(alignment, size) \
>         printf("memalign(%d,%d)=", alignment, size); \
>         ptr = memalign(alignment, size); \
>         printf("%p\n", ptr);
>
> int main()
> {
>     void * ptr;
>     TEST(1, 46)
>     TEST(4, 583)
>     TEST(64, 773)
>     TEST(32, 889)  /* <-- reliably fails here */
>     return 0;
> }

Did a quick build & run, reproduces under dosemu and dosbox, too.

memalign(1,46)=99010
memalign(4,583)=99060
memalign(64,773)=99300
memalign(32,889)=realloc: memory fouled
Exiting due to signal SIGABRT
Raised at eip=00005bec
eax=00094ba0 ebx=00000120 ecx=00000000 edx=00000000 esi=00000379 edi=00099618
ebp=00094c58 esp=00094b90 program=C:\A.EXE
cs: sel=00cf  base=01127000  limit=0009ffff
ds: sel=00d7  base=01127000  limit=0009ffff
es: sel=00d7  base=01127000  limit=0009ffff
fs: sel=00b7  base=00002a90  limit=0000ffff
gs: sel=00e7  base=00000000  limit=0010ffff
ss: sel=00d7  base=01127000  limit=0009ffff
App stack: [00094da8..00014dac]  Exceptn stack: [00014cf8..00012db8]

Call frame traceback EIPs:
  0x00005b3b
  0x00005bec
  0x00006c58
  0x000063b3
  0x0000203e
  0x00003674

--
O.S.