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: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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