Date: Sat, 24 Feb 2001 18:11:26 +0900 From: Mamoru Iwaki <iwaki@bc.niigata-u.ac.jp> To: freebsd-stable@FreeBSD.ORG Subject: sound driver kills kernel silently Message-ID: <20010224091128.3809.qmail@pikachu.bsp.bc.niigata-u.ac.jp>
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Hi,
My FreeBSD 4.2-STABLE box suddenly and silently downs and reboots
when the following sound program runs.
This simple program opens /dev/dsp with two file descriptors, one
for read and the other for write, then simply copy data from
read-device to write-one. This program was running this December
without such panics.
Someone else have a similar experiance?
Anybody knows how to solve it?
Thanks.
[ENVIRONMENT]
% uname -a
FreeBSD mi000.merlin.gs.niigata-u.ac.jp 4.2-STABLE FreeBSD 4.2-STABLE #0: Sat Feb 24 09:08:31 JST 2001 root@mi000.merlin.gs.niigata-u.ac.jp:/usr/obj/amd/mi004/home2/FreeBSD-src/stable4/src/sys/MI i386
% dmesg | grep sbc
sbc0: <Creative SB AWE64> at port 0x220-0x22f,0x330-0x331,0x388-0x38b irq 5 drq 1,5 on isa0
pcm0: <SB16 DSP 4.16> on sbc0
% cat /dev/sndstat
FreeBSD Audio Driver (newpcm) Feb 24 2001 09:07:03
Installed devices:
pcm0: <SB16 DSP 4.16> at io 0x220 irq 5 drq 1:5 (1p/1r channels duplex)
[PROGRAM]
#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#define DEV_IN "/dev/dsp"
#define DEV_OUT DEV_IN
#define BUFLEN 1
int main(void) {
int fdi, fdo;
char x[BUFLEN];
if ((fdi = open(DEV_IN, O_RDONLY)) == -1) {
perror("File open failure for read: " DEV_IN);
exit(1);
}
if ((fdo = open(DEV_IN, O_WRONLY)) == -1) {
perror("File open failure for write: " DEV_IN);
exit(1);
}
while (read(fdi, &x, sizeof(x)) > 0) write(fdo, &x, sizeof(x));
return 0;
}
---
-----
Mamoru IWAKI (iwaki@bc.niigata-u.ac.jp)
Graduate School of Science and Technology, Niigata University
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