[Linux-ia64] Common kernel paging error I get

[Linux-ia64] Common kernel paging error I get

[Broadfoot, KenX]

Just wondering if you all see this error often:

Unable to handle kernel paging request at virtual address 0000000000000008

I am using 2.4.0-test9 patched + kdb

When this happens I can't even get into the debugger.

This is on a Quad Lion with 2 gigs of Ram

I see this mostly when running fairly heavy network traffic.


If anyone is familiar with this and has found a way to minimize it, or can
explain what it is to me I would appreciate it.

--ken broadfoot

Re: [Linux-ia64] Common kernel paging error I get

[Don Dugger]

Ken-

What it is is most likely the kernel trying to de-reference a
NULL pointer.  Why this is happening is the question.  Since
you can't invoke the debugger when this happens you might want
to find out where in the kernel this message is coming from
and put a direct call to the debugger at that point.  This
should help to find out what is happening.

On Fri, Oct 27, 2000 at 09:26:28AM -0700, Broadfoot, KenX wrote:
> 
> Just wondering if you all see this error often:
> 
> Unable to handle kernel paging request at virtual address 0000000000000008
> 
> I am using 2.4.0-test9 patched + kdb
> 
> When this happens I can't even get into the debugger.
> 
> This is on a Quad Lion with 2 gigs of Ram
> 
> I see this mostly when running fairly heavy network traffic.
> 
> 
> If anyone is familiar with this and has found a way to minimize it, or can
> explain what it is to me I would appreciate it.
> 
> --ken broadfoot
> 
> 
> _______________________________________________
> Linux-IA64 mailing list
> Linux-IA64@linuxia64.org
> http://lists.linuxia64.org/lists/listinfo/linux-ia64

-- 
Don Dugger
"Censeo Toto nos in Kansa esse decisse." - D. Gale
n0ano@valinux.com
Ph: 303/938-9838

RE: [Linux-ia64] Common kernel paging error I get

[Ahna, Christopher J]

Ken,

I saw something like this a lot when I ran my BigSur with 4GB or more
memory.  It turned out that my problem came from some bad memory management
by the USB driver that was messing up other parts of the kernel.  You might
want to try the attached patch (made against test9) and see if it solves
your problem.  By the way, the fix included in the patch appears in the
latest test releases of 2.4.0-test10.  Thanks,

Chris

-----------------------------------------

diff -urN linux-2.4.0-test9-ia64-001004/drivers/usb/hub.c
linux-2.4.0-test9-ia64-001004-patch/drivers/usb/hub.c
--- linux-2.4.0-test9-ia64-001004/drivers/usb/hub.c	Thu Sep 28 13:20:48
2000
+++ linux-2.4.0-test9-ia64-001004-patch/drivers/usb/hub.c	Mon Oct 30
08:26:50 2000
@@ -592,11 +592,6 @@
 			info("USB new device connect on bus%d, assigned
device number %d",
 				dev->bus->busnum, dev->devnum);
 
-		if (portstr)
-			kfree(portstr);
-		if (tempstr)
-			kfree(tempstr);
-
 		/* Run it through the hoops (find a driver, etc) */
 		if (!usb_new_device(dev)) {
 			up(&usb_address0_sem);
@@ -612,6 +607,12 @@
 
 	hub->children[port] = NULL;
 	usb_hub_port_disable(hub, port);
+
+	if (portstr)
+		kfree(portstr);
+	if (tempstr)
+		kfree(tempstr);
+
 	up(&usb_address0_sem);
 }
 

-----Original Message-----
From: Broadfoot, KenX [mailto:kenx.broadfoot@intel.com]
Sent: Friday, October 27, 2000 9:26 AM
To: linux-ia64@linuxia64.org
Subject: [Linux-ia64] Common kernel paging error I get



Just wondering if you all see this error often:

Unable to handle kernel paging request at virtual address 0000000000000008

I am using 2.4.0-test9 patched + kdb

When this happens I can't even get into the debugger.

This is on a Quad Lion with 2 gigs of Ram

I see this mostly when running fairly heavy network traffic.


If anyone is familiar with this and has found a way to minimize it, or can
explain what it is to me I would appreciate it.

--ken broadfoot


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