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Bug 215126 - kernel: Attempt to allocate order 5 skbuff. Increase MAX_SKBUFF_ORDER.
kernel: Attempt to allocate order 5 skbuff. Increase MAX_SKBUFF_ORDER.
Product: Fedora
Classification: Fedora
Component: kernel-xen (Show other bugs)
x86_64 Linux
medium Severity medium
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Assigned To: Xen Maintainance List
Virtualization Bugs
Depends On:
  Show dependency treegraph
Reported: 2006-11-11 02:32 EST by Egon Kastelijn
Modified: 2009-12-14 15:40 EST (History)
1 user (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2008-02-26 18:41:31 EST
Type: ---
Regression: ---
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Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Egon Kastelijn 2006-11-11 02:32:50 EST
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20061108 Fedora/ Firefox/

Description of problem:

The following occurs in the syslog at high rates:

Nov 11 08:25:39 virtix kernel: Attempt to allocate order 5 skbuff. Increase MAX_SKBUFF_ORDER.
Nov 11 08:26:44 virtix last message repeated 1673 times
Nov 11 08:27:45 virtix last message repeated 2227 times

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Get a Intel D940, dual core with 3 intel Pro 1000 network cards.
2. Install FC5 Xen0.
3. Upgrade with yum to kernel 2.6.18-1.2200.fc5xen0
3. Run one or more XenU guests (idle) (is this realy needed?>
4. Do a network based install over eth0 to a laptop (HTTP)

Actual Results:
The syslog is flooded with messages:

kernel: Attempt to allocate order 5 skbuff. Increase MAX_SKBUFF_ORDER.

Expected Results:

Additional info:
Comment 1 Egon Kastelijn 2006-12-14 12:34:34 EST
I migrated the machine (and the Xen-guests) to FC6 with yum.
The problem still exists with kernel 2.6.18-1.2849.fc6xen on FC6.

Another way to reproduce the problem is to do a xenguest-install.
This produces some nice HTTP traffic over xenbr0, which causes the symptoms in

[root@host]# brctl show
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.feffffffffff       no              vif10.0

[root@host]# ip addr show dev xenbr0
18: xenbr0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue
    link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff
    inet6 fe80::200:ff:fe00:0/64 scope link
       valid_lft forever preferred_lft forever

Comment 2 Red Hat Bugzilla 2007-07-24 21:35:31 EDT
change QA contact
Comment 3 Chris Lalancette 2008-02-26 18:41:31 EST
This report targets FC6, which is now end-of-life.

Please re-test against Fedora 7 or later, and if the issue persists, open a new bug.


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