AFAIK the lockup occurs on server hardware, too. In my case, I used a
PCMCIA UMTS card (Sierra wireless AirCard 875).
My overall impression is, that it might be related to the payload
wireless devices put on the TCP/IP-stack. Typically, wireless devices
stress TCP congestion handling far more than wired connections do. And
yes, in my case the lockup may be provoked by a combination of CPU load
plus a fair amount of open TCP/IP connections.

-- 
Linux kernel 2.6.24-12 lockup
https://bugs.launchpad.net/bugs/204996
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