View Full Version : [ubuntu] invalid module format

March 29th, 2011, 01:26 PM
New install of Ubuntu 10.10, uname -r shows as 2.6.35-22-generic

We need to make a patch to a loadable module -- snd-usb-audio. Downloaded the source, and re-built the kernel with no problem, but cannot install the new version of snd-usb-audio.ko (note: the original source -- have not applied any changes yet).

Modprobe issues 'Invalid module format', dmesg has the message "disagrees about the version of symbol module_layout"

Modprobe with -f (force) does not change anything. With --force-modversion same result.

Did a 'modinfo' on both the original version (from the install) and the re-compiled version -- the only difference is the 'srcversion' value.

Also, doing an apt-get on the linux-source brings down (from the Makefile). Changed this to be 2.6.35-22-generic in order to get the correct 'vermagic' in the module.

How should we approach this issue? Is there a version of the source that exactly matches the 2.6.35-22-generic kernel from the installation? Do we have to re-compile and replace the entire kernel (really trying to avoid that as a general approach)? Is the 'srcversion' mismatch the cause of the Invalid module format error? If so, can we fudge that to get the module to load?

BTW: In general, would prefer to have the apt-get linux-source exactly match the installed kernel to avoid any possible mis-matches.

Thanks for any advice.