On Wed, Apr 06, 2005 at 04:33:42PM -0400, Christos Zoulas wrote:
>On Apr 6,  9:23pm, bouyer@antioche.eu.org (Manuel Bouyer) wrote:
>-- Subject: Re: port-xen/29887: sysctl kern.consdev coredumps
>
>| On Tue, Apr 05, 2005 at 03:21:00AM +0000, juan@xtraeme.nopcode.org wrote:
>| > 
>| > 	Running sysctl kern.consdev in a domU results in a coredump:
>| > 
>| > 	[juan@XenU_0][~]> sysctl kern.consdev          
>| > 	zsh: segmentation fault (core dumped)  sysctl kern.consdev
>| > 	[juan@XenU_0][~]>
>| 
>| Hi,
>| Can you check if this is fixed by
>| cd /dev
>| sh MAKEDEV xencons
>| 
>| The default install doesn't create /dev/xencons, I have a patch to fix this.
>
>This should be assigned to atatat@netbsd.org. It should not coredump anyway.

indeed!  can someone explain this:

     % cat > foo.c <<EOF
     #include <stdio.h>

     int
     main(int argc, char *argv[])
     {
	     const void *v;
	     const char *c;
	     v = c = NULL;

	     printf("%p\n", NULL);
	     printf("%p\n", v);
	     printf("%p\n", c);
	     printf("%s\n", NULL);
	     printf("%s\n", v);
	     printf("%s\n", c);

	     return (0);
     }
     EOF
     % cc -O2 foo.c
     % ./a.out
     0x0
     0x0
     0x0
     (null)
     (null)
     Segmentation fault (core dumped)
     % cc -O1 foo.c
     % ./a.out
     0x0
     0x0
     0x0
     (null)
     (null)
     Segmentation fault (core dumped)
     % cc -O0 foo.c
     % ./a.out
     0x0
     0x0
     0x0
     (null)
     (null)
     (null)

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