This report seems to be severely lacking in details. First, I don't
understand why it is called "mmap" since it doesn't do an mmap and the
"addr" that is being frobbed with isn't even initialized. Second, I
get a core dump when I run it on a -stable machine:
[speedy:tmp9] mmap
unlink files? NO
mmaping 10485760 byte region on file 0
Segmentation fault (core dumped)
...which is exactly what I'd expect when dealing with a bogus pointer.
You didn't specify what version of FreeBSD you saw a hang and didn't provide
any details of the hang. Please provide more information so that we can
help you. Thanks.
-DG
David Greenman
Co-founder/Principal Architect, The FreeBSD Project - http://www.freebsd.org
Creator of high-performance Internet servers - http://www.terasolutions.com
>This small program, running as 'mmap', not 'mmap -u', can hang my machine.
>Is this a known bug in FreeBSD's kernel, or it is my fantasy ?
>Thank you for answer.
>
>#include <stdio.h>
>#include <stdlib.h>
>#include <sys/types.h>
>#include <sys/mman.h>
>#include <unistd.h>
>#include <fcntl.h>
>#include <errno.h>
>
>main(int argc, char *argv[])
>{
> int fd;
> int i;
> int len=1024*1024*10; /*ie 10Mbytes*/
> caddr_t addr;
> char ttt[80];
> int bunlink = 0;
>
> if ( argc > 1 && strcmp(argv[1], "-u") == 0 ) {
> bunlink = 1;
> }
> printf("unlink files? %s\n", bunlink ? "YES" : "NO");
>
> for (i=0;;i++)
> {
> sprintf (ttt,"%d",i);
> printf("mmaping %ld byte region on file %s\n", len, ttt);
> fd=open(ttt,O_CREAT|O_RDWR,0666);
> if (fd<0)
> {
> printf("mmap error %ld",errno);
> exit(1);
> }
> memset(addr,'x',len);
> if ( munmap(addr, len) != 0 ) {
> fprintf(stderr, "munmap failed\n");
> exit(EXIT_FAILURE);
> }
> close(fd);
> if ( bunlink ) unlink(ttt);
> }
>}
>
>
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