Re: [BUG][2.6.8.1] Nevver dump core while /dev/men is mmaped

[Peter Seiderer]

> On Tue, 21 Sep 2004, Peter Seiderer wrote:
> 
> > Hello,
> > the following short program stops my computer immediately (no more
> > input, telnet etc. possible):
> >
> > --- begin ---
> > #include <stdio.h>
> > #include <sys/types.h>
> > #include <sys/stat.h>
> > #include <fcntl.h>
> > #include <sys/mman.h>
> > #include <assert.h>
> >
> > int main(int argc, char *argv[]) {
> > 	int fd;
> > 	assert((fd = open("/dev/mem", O_RDWR)) != (-1));
> >
> > 	size_t s = 67108864;
> > 	void *m;
> > 	assert((m = mmap(NULL, s, PROT_READ|PROT_WRITE, MAP_SHARED, fd,
> > 0xd0000000)) != NULL);
>          ^^^^^^^^^^^^^^^
>  Incorrect. mmap() returns MAP_FAILED, (void *)-1, when it fails, not
> NULL, (void *)0.
> 
> 
> Cheers,
> Dick Johnson
> Penguin : Linux version 2.4.26 on an i686 machine (5570.56 BogoMips).
>             Note 96.31% of all statistics are fiction.
> 

Shit, you are right! But did not change anything on the bad kernel
behaviour.....the mmap succeeds, and the kernel hangs in elf_core_dump.
Peter

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