2.6.6 kernel oops on ifconfig eth0 mtu 1300

Hi.

When I have some ethernet connection and then do
ifconfig eth0 mtu 1300 I get an immediate kernel panic (kernel 2.6.6) powerbook g4 15" 1ghz.

(xmon trace (jpeg) on request)

Ideas ?
Soeren

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Yes, please, the trace

Ben.

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doesn't it happen when you do ifconfig eth0 mtu 1300 ? anyway here it
is: use a web-browser to view it (it is a redirect):
http://www.nn7.de/kernel/mtu1300.jpg

Soeren

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Heh, didn't want to crash the laptop today. I CC'ed David Miller on that as he is the main author of the driver.

David: the crash is apparently us doing skb_put of ETH_FRAME_LEN + RX_LEN, so we tune the skb allocator to the MTU ? It's commented out in my bk snapshot but then, I may be missing something. Should we change sungem to use the mtu instead of ETH_FRAME_LEN ?

Ben.

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