Gabor Gombas wrote:
On Mon, Jan 07, 2008 at 06:10:29PM -0600, Robert Hancock wrote:
Gabor, I just noticed you said that it worked OK in 2.6.20, yet 2.6.22
fails. 2.6.20 had ADMA support as well, so I wonder what change started
causing the problem. Would it be possible for you to do a git bisect (or
at least try 2.6.21 to try and narrow it down)?
I've now booted 2.6.21.7, we'll see. The problem with the bisection is
that I can't explicitely trigger the bug so I can't say for sure if a
kernel is good or it is just needs more time to trigger. The average
uptime of this machine is just a couple hours a day.
For example, with 2.6.24-rc6 it took over 3 hours for the first disk to
trigger the bug and the second disk needed more than 7 hours. This
machine is seldom turned on for that long.
If you want to try to reproduce the problem more rapidly, you can try
the recipe I just suggested to the NVIDIA guys:
Run 2 instances of this C program, with different output files as the
argument, i.e. save this to fsynctest.c, and do
gcc fsynctest.c -o fsynctest
./fsynctest testfile & ./fsynctest testfile2 &
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
int main(int argc, char* argv[])
{
int i;
int fd = open( argv[1], O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR |
S_IWUSR);
if(fd == -1)
{
perror("open");
return 1;
}
for(i=0;i<1000000;i++)
{
int rc = write(fd, "0", 1);
if( rc != 1 )
{
perror("write");
return 2;
}
rc = fsync(fd);
if(rc)
{
perror("fsync");
return 2;
}
}
return 0;
}
Also run one instance of this:
dd if=/dev/zero of=blankfile bs=512 count=100000 oflag=direct
and one of this:
while /bin/true; do sdparm --command=sync /dev/sdb; done
all at the same time. In my experience, it helps to disable cpufreq (on
Red Hat/Fedora, /sbin/service cpuspeed stop) to force the CPU to run at
max frequency all the time. After a few minutes I got this:
ata4: EH in ADMA mode, notifier 0x0 notifier_error 0x0 gen_ctl 0x1501000
status 0x400 next cpb count 0x2 next cpb idx 0x0
ata4: CPB 0: ctl_flags 0x1f, resp_flags 0x0
ata4: CPB 1: ctl_flags 0x1f, resp_flags 0x0
ata4: CPB 2: ctl_flags 0x1f, resp_flags 0x0
ata4: timeout waiting for ADMA IDLE, stat=0x400
ata4: timeout waiting for ADMA LEGACY, stat=0x400
ata4.00: exception Emask 0x0 SAct 0x7 SErr 0x0 action 0x2 frozen
ata4.00: cmd 61/08:00:e0:74:64/00:00:0a:00:00/40 tag 0 ncq 4096 out
res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
ata4.00: status: { DRDY }
ata4.00: cmd 61/08:08:30:5b:76/00:00:0c:00:00/40 tag 1 ncq 4096 out
res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
ata4.00: status: { DRDY }
ata4.00: cmd 61/01:10:ba:51:77/00:00:0c:00:00/40 tag 2 ncq 512 out
res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
ata4.00: status: { DRDY }
ata4: soft resetting link
ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
ata4.00: configured for UDMA/133
ata4: EH complete
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