Date: Wed, 3 Feb 1999 14:32:24 -0500 (EST) From: Brian Dean <brdean@unx.sas.com> To: freebsd-current@FreeBSD.ORG Subject: aio_read panics SMP kernel Message-ID: <199902031932.OAA01903@dean.pc.sas.com>
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Hi,
I'm using a dual 350MHz Dell Precision 410 with 4.0-19990130-SNAP (SMP
enabled) to prototype a program that uses asynchronous read and write
(aio_read() and aio_write()), and found that the following simple and
not very useful program (it's for demonstration purposes only!) causes
the system to do one of three things:
1) panic - "page fault in the kernel" ... I don't have any
other specifics, I will follow up with the details
provided by the console as soon as I can make this
occur again (I should have written it down the
first time).
2) reset - no panic or anything, just a system reset and
subsequent reboot
3) hang - everything totally unresponsive, machine does not
respond to pings or anything else, no keyboard
response.
Below, please find the output of 'mptable' for the SMP experts and the
program that I used to cause the panic.
Any help on fixing this and/or suggestions on what I might be doing
wrong are much appreciated.
Thanks,
-Brian
--
Brian Dean Process Engineering brdean@unx.sas.com
Following is the output of 'mpinfo' on this machine:
[root@mrose]:/brdean- mptable
===============================================================================
MPTable, version 2.0.15
-------------------------------------------------------------------------------
MP Floating Pointer Structure:
location: BIOS
physical address: 0x000fe710
signature: '_MP_'
length: 16 bytes
version: 1.4
checksum: 0x91
mode: Virtual Wire
-------------------------------------------------------------------------------
MP Config Table Header:
physical address: 0x000f0000
signature: 'PCMP'
base table length: 468
version: 1.4
checksum: 0x33
OEM ID: 'DELL '
Product ID: 'WS 410 '
OEM table pointer: 0x00000000
OEM table size: 0
entry count: 50
local APIC address: 0xfee00000
extended table length: 0
extended table checksum: 0
-------------------------------------------------------------------------------
MP Config Base Table Entries:
--
Processors: APIC ID Version State Family Model Step Flags
0 0x11 BSP, usable 6 5 2 0x183fbff
1 0x11 AP, usable 6 5 2 0x183fbff
--
Bus: Bus ID Type
0 PCI
1 PCI
2 PCI
3 ISA
--
I/O APICs: APIC ID Version State Address
2 0x11 usable 0xfec00000
--
I/O Ints: Type Polarity Trigger Bus ID IRQ APIC ID PIN#
ExtINT active-hi edge 3 0 2 0
INT conforms conforms 3 1 2 1
INT conforms conforms 3 0 2 2
INT conforms conforms 3 3 2 3
INT conforms conforms 3 4 2 4
INT conforms conforms 3 5 2 5
INT conforms conforms 3 6 2 6
INT conforms conforms 3 7 2 7
INT conforms conforms 3 8 2 8
INT conforms conforms 3 9 2 9
INT conforms conforms 3 10 2 10
INT conforms conforms 3 11 2 11
INT conforms conforms 3 12 2 12
INT conforms conforms 3 14 2 14
INT conforms conforms 3 15 2 15
INT conforms conforms 0 13:A 2 16
INT conforms conforms 0 14:D 2 16
INT conforms conforms 0 16:B 2 16
INT conforms conforms 1 0:A 2 16
INT conforms conforms 2 6:C 2 16
INT conforms conforms 2 9:D 2 16
INT conforms conforms 0 13:B 2 17
INT conforms conforms 0 14:A 2 17
INT conforms conforms 0 16:C 2 17
INT conforms conforms 1 0:B 2 17
INT conforms conforms 2 6:D 2 17
INT conforms conforms 2 9:A 2 17
INT conforms conforms 0 13:C 2 18
INT conforms conforms 0 14:B 2 18
INT conforms conforms 0 16:D 2 18
INT conforms conforms 2 6:A 2 18
INT conforms conforms 2 9:B 2 18
INT conforms conforms 2 10:A 2 18
INT conforms conforms 2 14:A 2 18
INT conforms conforms 0 7:D 2 19
INT conforms conforms 0 13:D 2 19
INT conforms conforms 0 14:C 2 19
INT conforms conforms 0 16:A 2 19
INT conforms conforms 0 17:A 2 19
INT conforms conforms 2 6:B 2 19
INT conforms conforms 2 9:C 2 19
--
Local Ints: Type Polarity Trigger Bus ID IRQ APIC ID PIN#
ExtINT active-hi edge 3 0 255 0
NMI active-hi edge 3 0 255 1
-------------------------------------------------------------------------------
# SMP kernel config file options:
# Required:
options SMP # Symmetric MultiProcessor Kernel
options APIC_IO # Symmetric (APIC) I/O
# Optional (built-in defaults will work in most cases):
#options NCPU=2 # number of CPUs
#options NBUS=4 # number of busses
#options NAPIC=1 # number of IO APICs
#options NINTR=41 # number of INTs
===============================================================================
And here is the simple program to demonstrate the panic:
#include <stdio.h>
#include <fcntl.h>
#include <time.h>
#include <aio.h>
#include <string.h>
#include <errno.h>
#define BUFLEN 4096
char * progname;
int main ( int argc, char * argv [] )
{
int rc, fd;
char buf [ BUFLEN ];
char * fname;
int done;
aiocb_t cb = { 0 };
long long unsigned int pollcount;
progname = rindex ( argv[0], '/' );
if (progname == NULL)
progname = argv[0];
else
progname++;
if (argc != 2) {
fprintf ( stderr, "Usage: %s InputFile\n", progname );
exit(1);
}
fname = argv[1];
fd = open ( fname, O_RDONLY );
if (fd < 0) {
fprintf ( stderr, "%s: can't open %s for reading: %s\n",
progname, fname, strerror(errno) );
exit(1);
}
cb.aio_fildes = fd;
cb.aio_offset = 0;
cb.aio_buf = buf;
cb.aio_nbytes = BUFLEN;
done = 0;
while (!done) {
rc = aio_read ( &cb );
if (rc) {
fprintf ( stderr, "%s: aio_read(): %s\n", progname, strerror(errno) );
exit(1);
}
fprintf ( stderr, "%s: aio_read() OK, polling for completion ...\n",
progname );
pollcount = 0;
while (aio_error(&cb)==EINPROGRESS)
pollcount++;
fprintf ( stderr, "%s: polling completed, count = %qu\n",
progname, pollcount );
rc = aio_return ( &cb );
if (rc < 0) {
fprintf ( stderr, "%s: aio_return([read]): %s\n",
progname, strerror(errno) );
exit(1);
}
else if (rc == 0) {
done = 1;
}
else {
cb.aio_offset += rc;
}
}
return 0;
}
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