Segmentation fault in scm_igc

Segmentation fault in scm_igc

[David Hansen]

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Hello,

my first guile code started with a SIGSEGV.  Not sure if
it's not my fault but looks like a bug to me.

,----[ gtst.c ]
| // -*- compile-command: "gcc -g -Wall `guile-config compile` `guile-config link` gtst.c -o gtst" -*-
| 
| #include <libguile.h>
| 
| int
| main (void)
| {
|         SCM str = scm_makfrom0str ("hello world");
|         return 0;
| }
`----

,----[ gdb ]
| (gdb) run
| Starting program: /home/dhansen/tmp/gtst 
| 
| Program received signal SIGSEGV, Segmentation fault.
| [Switching to Thread 16384 (LWP 15966)]
| 0x4004d398 in scm_igc (what=0x0) at gc.c:1069
| (gdb) bt
| #0  0x4004d398 in scm_igc (what=0x0) at gc.c:1069
| #1  0x4004e54b in check_mtrigger (what=0x0) at gc.c:1959
| #2  0x4004e60a in scm_must_malloc (size=12, what=0x400a8231 "scm_allocate_string") at gc.c:2005
| #3  0x400807da in scm_allocate_string (len=11) at strings.c:241
| #4  0x400806f3 in scm_mem2string (src=0x8048614 "hello world", len=10) at strings.c:209
| #5  0x40080757 in scm_makfrom0str (src=0x8048614 "hello world") at strings.c:221
| #6  0x080484f0 in main () at gtst.c:8
| (gdb) 
`----

,----[ guile --version ]
| Guile 1.6.4
| Copyright (c) 1995, 1996, 1997, 2000, 2001, 2002, 2003 Free Software Foundation
| Guile may be distributed under the terms of the GNU General Public Licence;
| certain other uses are permitted as well.  For details, see the file
| `COPYING', which is included in the Guile distribution.
| There is no warranty, to the extent permitted by law.
`----

I just installed guile-1.6.4 myself using

$ ./configure --prefix=$HOME --with-threads --enable-debug-freelist --enable-debug-malloc --enable-guile-debug --disable-deprecated

I'm not on any lists, so if there's something interesting
for me please Cc: to me.

David

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Re: Segmentation fault in scm_igc

[Neil Jerram]

David Hansen <david.hansen@physik.fu-berlin.de> writes:

> Hello,
> 
> my first guile code started with a SIGSEGV.  Not sure if
> it's not my fault but looks like a bug to me.
> 
> ,----[ gtst.c ]
> | // -*- compile-command: "gcc -g -Wall `guile-config compile` `guile-config link` gtst.c -o gtst" -*-
> | 
> | #include <libguile.h>
> | 
> | int
> | main (void)
> | {
> |         SCM str = scm_makfrom0str ("hello world");
> |         return 0;
> | }
> `----

You need to follow a more particular model for your main function.
Please see node `A Sample Guile Main Program' in the manual.

        Neil


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Re: Segmentation fault in scm_igc

[Marius Vollmer]

David Hansen <david.hansen@physik.fu-berlin.de> writes:

> Hello,
>
> my first guile code started with a SIGSEGV.  Not sure if
> it's not my fault but looks like a bug to me.

You need to initialize Guile before using it.  For example:

    static void
    inner_main (void *data, int argc, char **argv)
    {
      SCM str = scm_makfrom0str ("hello world");
      /* ... */
    }

    int
    main (int argc, char **argv)
    {
      scm_boot_guile (argc, argv, inner_main, 0);
      return 0; /* never reached */
    }

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