>Number:         36429
>Category:       kern
>Synopsis:       EIO with puffs/dtfs
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jun 02 19:30:00 +0000 2007
>Originator:     YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
>Release:        NetBSD 4.99.20
>Organization:
	
>Environment:
Architecture: i386
Machine: i386
>Description:

	a strange EIO with the following code.

	% sudo ./obj/dtfs /mnt
	% mount
	<snip>
	puffs:dt on /mnt type puffs
	<snip>

	% cc a.c
	% ./a.out /mnt/b
	a.out: pwrite2: Input/output error

-------------------------------------------------- a.c
#include <err.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int
main(int argc, char *argv[])
{
	const char *filename;
	int fd;
	ssize_t ssz;
	char buf[1024*1024];

	filename = argv[1];
	fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0666);
	if (fd < 0)
		err(1, "open");

	memset(buf, 'A', sizeof(buf));
	ssz = pwrite(fd, buf, 1, 0x1000);
	if (ssz == -1) {
		warn("pwrite1");
	}
	memset(buf, 'B', sizeof(buf));
	ssz = pwrite(fd, buf, 2, 0xfff);
	if (ssz == -1) {
		warn("pwrite2");
	}

	exit(0);
}
--------------------------------------------------

>How-To-Repeat:
	see above.
>Fix:
	

>Unformatted: