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man 7 netdevice states:

SIOCGIFMTU, SIOCSIFMTU

Get or set the MTU (Maximum Transfer Unit) of a device using ifr_mtu. Setting the MTU is a privileged operation. Setting the MTU to too small values may cause kernel crashes.

I don't see any connection between MTU and a kernel crash. Under what circumstances could a small MTU value lead to a kernel crash?

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Small MTU leads to more packets. Many more packets? Too much work for the kernel, hence a crash/. Is this intellectual curiosity at work, or do you have a problem which involves this?

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