klogd is acting strange with 2.4

klogd is acting strange with 2.4

[newsreader]

celeron 433 intel i810.  320MB ram.

Before 2.2.18.  Now I've tested with both
2.4.1-pre12 and 2.4.1.  2.4 kernel klogd is
always using 99% cpu.  What gives?

I've three other less powerful boxes running
2.4.x kernels and none of them behave
like this.  This server isn't taking any
more hits than it usually does.

What more information I should post here?
I've two apache servers, pgsql and sendmail
and some other processes running on this
server.

Thanks in advance
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Re: klogd is acting strange with 2.4

[David Rees]

On Tue, Jan 30, 2001 at 09:30:36AM -0500, newsreader@mediaone.net wrote:
> celeron 433 intel i810.  320MB ram.
> 
> Before 2.2.18.  Now I've tested with both
> 2.4.1-pre12 and 2.4.1.  2.4 kernel klogd is
> always using 99% cpu.  What gives?
> 
> I've three other less powerful boxes running
> 2.4.x kernels and none of them behave
> like this.  This server isn't taking any
> more hits than it usually does.
> 
> What more information I should post here?
> I've two apache servers, pgsql and sendmail
> and some other processes running on this
> server.

Can you try 2.4.0?  Are you using the 3c59x ethernet driver?  I've got the 
same problem on one of my machines, (see message with subject "2.4.1-pre10 
-> 2.4.1 klogd at 100% CPU ; 2.4.0 OK") and the last thing that is logged 
is a message from the 3c59x ethernet driver.

I'm doing a bit more digging to see what changed in the driver between 
revisions.  /proc/pci lists my 3c905B as this:
3Com Corporation 3c905B 100BaseTX [Cyclone] (rev 48)

-Dave
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Re: klogd is acting strange with 2.4

[Jon Burgess]

>> Before 2.2.18.  Now I've tested with both
>> 2.4.1-pre12 and 2.4.1.  2.4 kernel klogd is
>> always using 99% cpu.  What gives?
>>

> Can you try 2.4.0?  Are you using the 3c59x ethernet driver?  I've got the
> same problem on one of my machines, (see message with subject "2.4.1-pre10
> -> 2.4.1 klogd at 100% CPU ; 2.4.0 OK") and the last thing that is logged
> s a message from the 3c59x ethernet driver.

I've seen someone else report that this occurs when klogd reads a NULL
character. In his case the line in the 3c59x.c driver which prints out the
'product code' was responsible for this.

In the 2.4.1 patch this printk has been added to 3c59x.c:-

+    printk(KERN_INFO "  product code '%c%c' rev %02x.%d date %02d-"
+            "%02d-%02d\n", eeprom[6]&0xff, eeprom[6]>>8, eeprom[0x14],
+            step, (eeprom[4]>>5) & 15, eeprom[4] & 31, eeprom[4]>>9);

Could you try commenting out these lines and see if it fixes the problem?

     Jon


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Re: klogd is acting strange with 2.4

[David Rees]

On Tue, Jan 30, 2001 at 08:53:59AM -0800, David Rees wrote:
> On Tue, Jan 30, 2001 at 09:30:36AM -0500, newsreader@mediaone.net wrote:
> > celeron 433 intel i810.  320MB ram.
> > 
> > Before 2.2.18.  Now I've tested with both
> > 2.4.1-pre12 and 2.4.1.  2.4 kernel klogd is
> > always using 99% cpu.  What gives?
> > 
> > I've three other less powerful boxes running
> > 2.4.x kernels and none of them behave
> > like this.  This server isn't taking any
> > more hits than it usually does.
> > 
> > What more information I should post here?
> > I've two apache servers, pgsql and sendmail
> > and some other processes running on this
> > server.
> 
> Can you try 2.4.0?  Are you using the 3c59x ethernet driver?  I've got the 
> same problem on one of my machines, (see message with subject "2.4.1-pre10 
> -> 2.4.1 klogd at 100% CPU ; 2.4.0 OK") and the last thing that is logged 
> is a message from the 3c59x ethernet driver.
> 
> I'm doing a bit more digging to see what changed in the driver between 
> revisions.  /proc/pci lists my 3c905B as this:
> 3Com Corporation 3c905B 100BaseTX [Cyclone] (rev 48)

After digging through the archive, it seems that the klogd program doesn't
handle nulls very nicely.  Anyway, by commenting out one of the
initialization printks introduced in the 3c59x driver in 2.4.1, I can run
2.4.1 without having klogd suck up all my CPU time.  The patch is below.

-Dave

--- linux/drivers/net/3c59x.c.orig      Sat Jan  6 09:27:42 2001
+++ linux/drivers/net/3c59x.c   Tue Jan 30 09:05:20 2001
@@ -1049,9 +1049,11 @@
 
        EL3WINDOW(4);
        step = (inb(ioaddr + Wn4_NetDiag) & 0x1e) >> 1;
+/*
        printk(KERN_INFO "  product code '%c%c' rev %02x.%d date %02d-"
                   "%02d-%02d\n", eeprom[6]&0xff, eeprom[6]>>8, eeprom[0x14],
                   step, (eeprom[4]>>5) & 15, eeprom[4] & 31, eeprom[4]>>9);
+*/
 
 
        if (pdev && vci->drv_flags & HAS_CB_FNS) {

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