Date: Tue, 26 Oct 2004 20:03:31 +0200 From: Willem Jan Withagen <wjw@withagen.nl> To: obrien@freebsd.org Cc: freebsd-amd64@freebsd.org Subject: Re: two 4GB mallocs => SEGV Message-ID: <417E9173.90406@withagen.nl> In-Reply-To: <20041026173005.GA2984@dragon.nuxi.com> References: <20041026115041.GE2841@sivokote.iziade.m$> <20041026173005.GA2984@dragon.nuxi.com>
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David O'Brien wrote:
> On Tue, Oct 26, 2004 at 02:50:41PM +0300, Georgi Guninski wrote:
>
>>amdkotef64# cat test.c
>>#include <stdlib.h>
>>
>>int main(int ac, char **av)
>>{
>>char *a, *b;
>>size_t siz;
>>siz=4L*1024L*1024L*1024L;
>>printf("%lx\n",siz);
>>a=malloc(siz);
>>printf("%lx\n",a);
>>b=malloc(siz);
>>printf("%lx\n",b);
>>}
>>amdkotef64# gcc test.c
>>amdkotef64# ./a.out
>>100000000
>>503000
>>/: write failed, filesystem is full
>>Segmentation fault
>
>
> I don't know why you didn't take this to the next step to try to figure
> out what was going on....
>
> # cc -g test.c
> # gdb a.out
> (gdb) run
> Starting program: /var/tmp/a.out
> 100000000
> 503000
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x0000000200503002 in ?? () from /libexec/ld-elf.so.1
> (gdb) where
>
> now the output you get isn't but so helpful because you wind up in the
> middle of libc. So if you build libc with -g and don't strip the lib
> when installing it you get:
A man is never too old to learn....
Thanx for the education, perhaps too simple to think of.
--WjW
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