Re: core dump on realloc?

[Roberto Ierusalimschy <rieru@...>]

On Tue, 8 Jan 2002, Derek Gottfrid wrote:

> This seems very strange to me but i have seen it repeatedly now.  I have
> embedded lua into a cgi to act as a simple templating engine and the cgi
> is execute approx 500k times a day but once a day - it cores. Looking at
> the trace with gdb always points to the same point - the realloc call.
>
> #6  0x24bfc in luaM_realloc (L=0x907c8, block=0x0, size=89) at lmem.c:141
> #7  0x275d4 in luaS_newlstr (L=0x907c8,
>
> lmem.c:141  is very simple realloc call.
>
> In this case since it is a new string it is passing NULL which should make
> realloc perform just like malloc.  I checked the archives and saw mention
> of somebody having the same problem in 03/2001 but no resolution.
>
> [...]
>
> I am using ...
> solaris 2.8
> gcc 2.95.2
> lua 4.0

This may also be a bug in the system malloc library. The old Sun-OS did
not even accept realloc(NULL), maybe solaris still has sporadig bugs
with this case.

-- Roberto