[fpc-pascal] RE: heap problem or fpc_ansistr_decr_ref in FPC for ARM

[josepascual]

Hi,

I have tried to compile program which failed in version 2.1.4 ppcrossarm as:

Program received signal SIGSEGV, Segmentation fault.
TRY_CONCAT_FREE_CHUNK_FORWARD (MC=0x40213170) at heap.inc:679
679     in heap.inc

with a version 2.3.1 ppcrossarm (snap 20/06/2007) with other different error
also in heap.inc:

Program received signal SIGSEGV, Segmentation fault.
0x0002a948 in WAITFREE_VAR (PMCV=0xdf770, LOC_FREELISTS=0x0) at
heap.inc:1054
1054      pmcv^.next_var := loc_freelists^.waitvar;

As we can see in line 1054 code try to access to waitvar field in
loc_freelists but this address is 0x0?

backtrace:
(gdb) bt
#0  WAITFREE_VAR (PMCV=0xdf770, LOC_FREELISTS=0x0) at heap.inc:1054
#1  0x0002aac0 in SYSFREEMEM_VAR (LOC_FREELISTS=0xdf784, PMCV=0x1)
    at heap.inc:1114
#2  0x0002abac in SYSFREEMEM (P=0xdf77c) at heap.inc:1154
#3  0x000297e4 in FREEMEM (P=0x1) at heap.inc:289
#4  0x0001cca0 in fpc_ansistr_decr_ref (S=0xdf77c) at astrings.inc:107
#5  0x00079318 in LUAPUSHVARIANT (L=0xe6a08, N=void) at LuaUtils.pas:464
#6  0x0006adf4 in LUACOPYTABLE (L=0xe6a08, IDXFROM=6, IDXTO=2, MTTO=3)
    at lua_WrapUp.pas:51
#7  0x0006ae30 in LUACOPYTABLE (L=0xe6a08, IDXFROM=4, IDXTO=2, MTTO=3)
    at lua_WrapUp.pas:57
#8  0x0006b1bc in NEW_TMYTYPE (L=0xe6a08) at lua_WrapUp.pas:125
#9  0x0009dc98 in luaD_precall ()
#10 0x000a6b60 in luaV_execute ()
#11 0x00000000 in ?? ()

any suggestion to patch it?

thank you in advanced.

Jose Pascual