ifup eth0
SIOCSIFFLAGS: Cannot allocate memory
Failed to bring up eth0

This is on a Centos 5.5 machine with OpenVZ kernel 2.6.18-238.12.1.el5.028stab091.1PAE, I updated 3 systems with the same hardware to the same kernel and for some reason the network didn't come back.

This only happened once the first time I booted into the new kernel and hasn't happened again but this is a serious issue for those running systems from remote locations such as a datacenters.

I believe rebooting is what fixed everything or possibly removing and reloading the kernel module for the NIC.

This may be a sign of a bad motherboard or power supply, eventually the related system just wouldn't come back after a reboot and would not power up at all.  Further, before the system died weird and random things happened with grub needing to be reinstalled after being corrupted etc...

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