Date: Sun, 6 Jun 1999 17:24:41 -0400 (EDT) From: Brian Feldman <green@unixhelp.org> To: hackers@FreeBSD.org Subject: problem for the VM gurus Message-ID: <Pine.BSF.4.10.9906061720010.71926-100000@janus.syracuse.net>
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In the long-standing tradition of deadlocks, I present to you all a new one.
This one locks in getblk, and causes other processes to lock in inode. It's
easy to induce, but I have no idea how I'd go about fixing it myself
(being very new to that part of the kernel.)
Here's the program which induces the deadlock:
#include <sys/types.h>
#include <sys/mman.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
int
main(int argc, char **argv) {
int psize = getpagesize() * 2;
void *tmp;
char name[] = "m.XXXXXX";
int fd = mkstemp(name);
if (fd == -1) {
perror("open");
exit(1);
}
tmp = mmap(NULL, psize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (tmp == MAP_FAILED) {
perror("mmap");
exit(1);
}
printf("write retval == %lld", write(fd, tmp, psize));
unlink(name);
exit(0);
}
Brian Feldman _ __ ___ ____ ___ ___ ___
green@unixhelp.org _ __ ___ | _ ) __| \
FreeBSD: The Power to Serve! _ __ | _ \._ \ |) |
http://www.freebsd.org _ |___)___/___/
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