2002-03-18 07:44:04

by michaelm

[permalink] [raw]
Subject: Suspicious about 2.4.18

I'm not really a linux expert, so I can only be suspicious.

Masquerading of iptables 1.2.5 sudently idles when "iptables -L" shows
everything is alright. A realoading of rc.firewall brings everything back to
normal. That happened 7 days after a normal operation. I've now upgraded to
1.2.6 and see what happens.

Also, crond doesn't seem to operate very precisely. It is sometimes seems
idle for 30 minutes.

I know that these may be application-specific problems, but I was curious if
there are any current kernel issues related to them so I can quit searching
for another cure.

Thanks. Michael.


2002-03-18 09:21:12

by Adam Johansson

[permalink] [raw]
Subject: Re: Suspicious about 2.4.18

On Mon, 18 Mar 2002, Michael wrote:

> I'm not really a linux expert, so I can only be suspicious.

Neither am I but I after seeing strange cron-jobs being run in the
future according to the log,I upgraded to 2.4.19pre3 and all was ok
again.

> Masquerading of iptables 1.2.5 sudently idles when "iptables -L" shows
> everything is alright. A realoading of rc.firewall brings everything back to
> normal. That happened 7 days after a normal operation. I've now upgraded to
> 1.2.6 and see what happens.
>
> Also, crond doesn't seem to operate very precisely. It is sometimes seems
> idle for 30 minutes.

I tried running this small script under 2.4.18 and noticed very strange
outputs..

// --- start ---
#!/bin/tcsh
while (1)
date
end
// --- end ---

./timescript > output

output gives me this;
Fri Mar 15 10:17:12 CET 2002
Fri Mar 15 10:17:12 CET 2002
Fri Mar 15 10:17:12 CET 2002
Fri Mar 15 10:17:12 CET 2002
Fri Mar 15 10:17:12 CET 2002
Fri Mar 15 10:17:12 CET 2002
Fri Mar 15 11:29:43 CET 2002
Fri Mar 15 11:29:43 CET 2002
Fri Mar 15 11:29:43 CET 2002
Fri Mar 15 10:17:13 CET 2002
Fri Mar 15 10:17:13 CET 2002
Fri Mar 15 10:17:13 CET 2002
Fri Mar 15 10:17:13 CET 2002
Fri Mar 15 10:17:13 CET 2002
Fri Mar 15 10:17:13 CET 2002


Which clearly shows that something is very very strange.
I've no idea where or why this happens but since upgrading to 2.4.19pre3
helped I assume that there is something in the kernel that is wrong.
I run SuSE7.2 with a vanilla 2.4.18 (now 2.4.19pre3).

> I know that these may be application-specific problems, but I was curious if
> there are any current kernel issues related to them so I can quit searching
> for another cure.
>
> Thanks. Michael.
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>

Cheers! /Adam

-=-=-=-=-=-=-=-=-=-=-=-=-
Adam Johansson
Developer @ MadSci AB
Phone: +46 (0)18 606462
ICQ: 58187935
http://www.madsci.se
-=-=-=-=-=-=-=-=-=-=-=-=-

2002-03-18 16:21:17

by Mike Fedyk

[permalink] [raw]
Subject: Re: Suspicious about 2.4.18

On Mon, Mar 18, 2002 at 10:20:50AM +0100, Adam Johansson wrote:
> // --- start ---
> #!/bin/tcsh
> while (1)
> date
> end
> // --- end ---
>
> ./timescript > output
>
> output gives me this;
> Fri Mar 15 10:17:12 CET 2002
> Fri Mar 15 10:17:12 CET 2002
> Fri Mar 15 10:17:12 CET 2002
> Fri Mar 15 10:17:12 CET 2002
> Fri Mar 15 10:17:12 CET 2002
> Fri Mar 15 10:17:12 CET 2002
> Fri Mar 15 11:29:43 CET 2002
> Fri Mar 15 11:29:43 CET 2002
> Fri Mar 15 11:29:43 CET 2002
> Fri Mar 15 10:17:13 CET 2002
> Fri Mar 15 10:17:13 CET 2002
> Fri Mar 15 10:17:13 CET 2002
> Fri Mar 15 10:17:13 CET 2002
> Fri Mar 15 10:17:13 CET 2002
> Fri Mar 15 10:17:13 CET 2002
>
>
> Which clearly shows that something is very very strange.
> I've no idea where or why this happens but since upgrading to 2.4.19pre3
> helped I assume that there is something in the kernel that is wrong.
> I run SuSE7.2 with a vanilla 2.4.18 (now 2.4.19pre3).
>

Can you try to reproduce with pre1 and pre2?

2002-03-18 17:17:18

by Pierre Lombard

[permalink] [raw]
Subject: Re: Suspicious about 2.4.18

On Mon, Mar 18, 2002 at 10:20:50AM +0100, Adam Johansson wrote:
> On Mon, 18 Mar 2002, Michael wrote:
>
> > I'm not really a linux expert, so I can only be suspicious.
>
> Neither am I but I after seeing strange cron-jobs being run in the
> future according to the log,I upgraded to 2.4.19pre3 and all was ok
> again.

Not sure it is quite relevant but...

I had such a weird behavior on my Abit KT7 (with VIA chipsets) based
system: the time often went wild when I started doing heavy I/O between
IDE0 and IDE1... and after that the system had to be restarted :/

The workaround below by Vojtech Pavlik has fixed this issue on my system:

Re: [PATCH] VIA timer fix was removed?
From: Vojtech Pavlik ([email protected])
Date: Mon Nov 12 2001 - 16:58:32 EST

http://www.uwsg.iu.edu/hypermail/linux/kernel/0111.1/0951.html

> > Masquerading of iptables 1.2.5 sudently idles when "iptables -L" shows
> > everything is alright. A realoading of rc.firewall brings everything back to
> > normal. That happened 7 days after a normal operation. I've now upgraded to
> > 1.2.6 and see what happens.
> >
> > Also, crond doesn't seem to operate very precisely. It is sometimes seems
> > idle for 30 minutes.
>
> I tried running this small script under 2.4.18 and noticed very strange
> outputs..
>
> // --- start ---
> #!/bin/tcsh
> while (1)
> date
> end
> // --- end ---
>
> ./timescript > output
>
> output gives me this;
> Fri Mar 15 10:17:12 CET 2002
> Fri Mar 15 10:17:12 CET 2002
> Fri Mar 15 10:17:12 CET 2002
> Fri Mar 15 10:17:12 CET 2002
> Fri Mar 15 10:17:12 CET 2002
> Fri Mar 15 10:17:12 CET 2002
> Fri Mar 15 11:29:43 CET 2002
> Fri Mar 15 11:29:43 CET 2002
> Fri Mar 15 11:29:43 CET 2002
> Fri Mar 15 10:17:13 CET 2002
> Fri Mar 15 10:17:13 CET 2002
> Fri Mar 15 10:17:13 CET 2002
> Fri Mar 15 10:17:13 CET 2002
> Fri Mar 15 10:17:13 CET 2002
> Fri Mar 15 10:17:13 CET 2002
>
>
> Which clearly shows that something is very very strange.
> I've no idea where or why this happens but since upgrading to 2.4.19pre3
> helped I assume that there is something in the kernel that is wrong.
> I run SuSE7.2 with a vanilla 2.4.18 (now 2.4.19pre3).
>
> > I know that these may be application-specific problems, but I was curious if
> > there are any current kernel issues related to them so I can quit searching
> > for another cure.

--
Best regards,
Pierre Lombard