2.5.70 lockup while write()ing to /dev/hda1

2.5.70 lockup while write()ing to /dev/hda1

[lode leroy]

I just want to report a problem I saw on linux 2.5.70:
(since I have a workaround, I do not intend to debug this further)

the following program locks up the computer.
sometimes this has happened after about 16MB,
sometimes after about 64MB...

main()
{
    int f = open("/dev/hda1", O_RDWR);
    char buffer[8192];
    for(i=0;1;i++) {
       printf("%d\r", i);
       write(f, buffer, sizeof(buffer);
       /* fsync(f); */
    }
    close(f)
}

when using adding the fsync(), all goes fine!

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Re: 2.5.70 lockup while write()ing to /dev/hda1

[Michael Buesch]

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On Wednesday 06 August 2003 14:32, lode leroy wrote:
> main()
> {
>     int f = open("/dev/hda1", O_RDWR);
>     char buffer[8192];
>     for(i=0;1;i++) {
>        printf("%d\r", i);
>        write(f, buffer, sizeof(buffer);

Shouldn't this be:
	write(f, buffer, sizeof(buffer) / sizeof(buffer[0]));

And what are you thying to do with the code?

>        /* fsync(f); */
>     }
>     close(f)
> }

- -- 
Regards Michael Buesch  [ http://www.8ung.at/tuxsoft ]
Penguin on this machine:  Linux 2.6.0-test2 - i386

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Re: 2.5.70 lockup while write()ing to /dev/hda1

[Andreas Schwab]

Michael Buesch <fsdeveloper@yahoo.de> writes:

|> On Wednesday 06 August 2003 14:32, lode leroy wrote:
|> > main()
|> > {
|> >     int f = open("/dev/hda1", O_RDWR);
|> >     char buffer[8192];
|> >     for(i=0;1;i++) {
|> >        printf("%d\r", i);
|> >        write(f, buffer, sizeof(buffer);
|> 
|> Shouldn't this be:
|> 	write(f, buffer, sizeof(buffer) / sizeof(buffer[0]));

sizeof(char) == 1, always and everywhere.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Deutschherrnstr. 15-19, D-90429 Nürnberg
Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: 2.5.70 lockup while write()ing to /dev/hda1

[Felipe Alfaro Solana]

On Wed, 2003-08-06 at 14:32, lode leroy wrote:
> I just want to report a problem I saw on linux 2.5.70:
> (since I have a workaround, I do not intend to debug this further)
> 
> the following program locks up the computer.
> sometimes this has happened after about 16MB,
> sometimes after about 64MB...

Don't you think 2.5.70 is a little bit obsolete now? ;-)
I recoomend you testing this on 2.6.0-test2-latest. Using the latest
available kernel will probably help mantainers to nail down any problem.

Re: 2.5.70 lockup while write()ing to /dev/hda1

[lode leroy]

Actually, you're right... i don't see this on 2.6.0-test2 .
I should have tried upgrading first!


>From: Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>
>To: lode leroy <lode_leroy@hotmail.com>
>CC: LKML <linux-kernel@vger.kernel.org>
>Subject: Re: 2.5.70 lockup while write()ing to /dev/hda1
>Date: Wed, 06 Aug 2003 15:05:06 +0200
>
>On Wed, 2003-08-06 at 14:32, lode leroy wrote:
> > I just want to report a problem I saw on linux 2.5.70:
> > (since I have a workaround, I do not intend to debug this further)
> >
> > the following program locks up the computer.
> > sometimes this has happened after about 16MB,
> > sometimes after about 64MB...
>
>Don't you think 2.5.70 is a little bit obsolete now? ;-)
>I recoomend you testing this on 2.6.0-test2-latest. Using the latest
>available kernel will probably help mantainers to nail down any problem.
>

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