Common kernel paging error I get

Linux-ia64 Broadfoot, KenX 3 participants 3 messages Oct 27, 2000 – Oct 30, 2000

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Broadfoot, KenX

author

2000-10-27 16:26 UTC #0 lore raw

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

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.

Quoted 24 lines · 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
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Ahna, Christopher J

2000-10-30 23:41 UTC #2 lore raw

In reply to Broadfoot, KenX

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:[email protected]]
Sent: Friday, October 27, 2000 9:26 AM
To: [email protected]
Subject: [Linux-ia64] Common kernel paging error I get