Date: Thu, 8 Mar 2001 12:35:21 -0800 (PST) From: albowicz@cs.ucr.edu To: freebsd-gnats-submit@FreeBSD.org Subject: kern/25617: aio_read crashes system. Message-ID: <200103082035.f28KZLi52527@freefall.freebsd.org>
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>Number: 25617
>Category: kern
>Synopsis: aio_read crashes system.
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Mar 08 12:40:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: Joe Albowicz
>Release: 4.2-STABLE
>Organization:
>Environment:
FreeBSD cd8.corp124.com 4.2-STABLE FreeBSD 4.2-STABLE #2: Wed Feb 7 19:13:39 PST 2001 nigelc@cd14.corp124.com:/usr/src/sys/compile/CDs-BSD-STABLE i386
>Description:
Issuing two aio_reads for 131K blocks on a raw scsi device crashes the system. Other block sizes do not crash the system. Also using a normal file (e.g. "/tmp/foo.txt") does not crash the system.
>How-To-Repeat:
Run this program. as "a.out /dev/rda2"
#include <aio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
void do_aio_stuff(char * fname, int sector_size, int num_aiocbs)
{
char buffs[num_aiocbs * sector_size];
int fh = open(fname, O_RDONLY);
assert(fh >= 0);
aiocb iocbs[num_aiocbs];
int cb_index;
memset(iocbs, '\0', sizeof(aiocb) * num_aiocbs);
for(cb_index = 0; cb_index < 2; cb_index++)
{
off_t pos = (long long) cb_index * sector_size +16384;
iocbs[cb_index].aio_fildes = fh;
iocbs[cb_index].aio_offset = pos;
iocbs[cb_index].aio_buf = &buffs[cb_index*sector_size];
iocbs[cb_index].aio_nbytes = sector_size;
int ret_val = aio_read(&iocbs[cb_index]);
if(ret_val == -1)
{
printf("aio_read error == %s\n", strerror(errno));
exit(0);
}
}
printf("Going to sleep\n");
sleep(5);
close(fh);
}
int main(int argc, char * argv[])
{
char partition_name[1000];
strcpy(partition_name, argv[1]);
//int ss = 16384; // WORKS!!
int ss = 131072;
//int ss = 262144; // WORKS!!
do_aio_stuff(partition_name, ss, 10);
return 0;
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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