[Gambas-user] Segfault with rev 7562

[Benoît Minisini]

Le 07/01/2016 05:26, adamnt42 at ...626... a écrit :
> I getting a segfault with gbr3.
>
> It happens when running any executable archive including the IDE.
>
> The gdb output is:
> Program received signal SIGSEGV, Segmentation fault.
> EXEC_special (special=11, class=0x80ac13c, object=0x813e68c, nparam=0, drop=1 '\001') at gbx_exec.c:1649
> 1649		if (CLASS_DESC_get_type(desc) == CD_STATIC_METHOD)
> 2: index = 0
> 1: desc = (CLASS_DESC *) 0x0
>
> The routine in gbx_exec.c is : bool EXEC_special(int special, CLASS *class, void *object, int nparam, bool drop).
> The introductory code is:
> 	CLASS_DESC *desc;
> 	short index = class->special[special];
>
> 	if (index == NO_SYMBOL)
> 		return TRUE;
>
> 	desc = CLASS_get_desc(class, index);
>
> 	if (CLASS_DESC_get_type(desc) == CD_STATIC_METHOD)
>
> The problem is that index is 0, this is occurring invariably when an Object[] class is being initialised. The backtrace is:
> (gdb) backtrace
> #0  0x08078d4e in EXEC_special (special=11, class=0x80ac13c, object=0x813e68c, nparam=0, drop=1 '\001')
>      at gbx_exec.c:1649
> #1  0x08079acb in EXEC_new () at gbx_exec.c:1947
> #2  0x08082ac4 in EXEC_loop () at gbx_exec_loop.c:916
> #3  0x08076da5 in EXEC_function_loop () at gbx_exec.c:931
> #4  0x0807763f in EXEC_function_real () at gbx_exec.c:895
> #5  0x08051168 in CLASS_run_inits (class=0x813a994) at gbx_class_load.c:1287
> #6  0x0805120e in CLASS_load_real (class=0x813a994) at gbx_class_load.c:1323
> #7  0x08062f15 in ARCHIVE_load_exported_class (arch=0x80c8584, pass=1) at gbx_archive.c:192
> #8  0x0807035b in COMPONENT_load_all_finish () at gbx_component.c:147
> #9  0x08055da3 in PROJECT_load_finish () at gbx_project.c:486
> #10 0x0806530c in init (file=file at ...2861...=0xbfffeeeb "./gambas3.gambas", argc=1, argv=0xbfffecc4) at gbx.c:103
> #11 0x0804b390 in main (argc=1, argv=0xbfffecc4) at gbx.c:372
>
> A bit more info:
> (gdb) disp class->special
> 3: class->special = {12, -1, 21, 15, -1, 22, -1, -1, -1, -1, -1, 0}
> (gdb) disp special
> 4: special = 11
>
> i.e.  index = class->special[special] is the last entry in the class->special array.
> and then
> desc = CLASS_get_desc(class, index);
>
> (gdb) disp desc
> 5: desc = (CLASS_DESC *) 0x0
>
> Finally, It happens the second time that routine is called. The first call executes properly (the value of the "special" param is 0).
>
> N.B. this is on a clean copy of the gambas source, not our local version.
>
> Any other info needed?
>
> regards
> bruce
>

No problem there... The 11th special method ("_ready") has been added in 
revision r7541.

Did you try a recompilation and reinstallation from scratch?

Are you sure that you didn't have binary packages of previous gambas 
versions installed that you didn't uninstall?

-- 
Benoît Minisini