insmod: ERROR ... Unknown symbol in module

[lulinqing]

Tested and hit the same issue on two fc20 machines:

$ uname -r
3.13.6-200.fc20.x86_64

$ sudo insmod kpatch-foo.ko 
insmod: ERROR: could not insert module kpatch-foo.ko: Unknown symbol in module
$ dmesg | tail
...
[59874.745996] kpatch_foo: module verification failed: signature and/or  required key missing - tainting kernel
[59874.746086] kpatch_foo: Unknown symbol kpatch_register (err 0)
[59874.746119] kpatch_foo: Unknown symbol kpatch_unregister (err 0)

$ sudo insmod kpatch-foo.ko 
insmod: ERROR: could not insert module kpatch-foo.ko: Unknown symbol in module
$ dmesg | tail
...
[59874.745996] kpatch_foo: module verification failed: signature and/or  required key missing - tainting kernel
[59874.746086] kpatch_foo: Unknown symbol kpatch_register (err 0)
[59874.746119] kpatch_foo: Unknown symbol kpatch_unregister (err 0)
[59924.752963] kpatch_foo: Unknown symbol kpatch_register (err 0)
[59924.752982] kpatch_foo: Unknown symbol kpatch_unregister (err 0)

[jpoimboe]

Hi @lulinqing , did you load kpatch.ko first?

[lulinqing]

hi @jpoimboe , thanks for reminding... Seems I failed to load kpatch.ko because of some reason during the upgrade from fc19~fc20 ( issue #86 ) and I didn't notice that.

$ ls /usr/local/lib/modules/$(uname -r)/kpatch/kpatch.ko
/usr/local/lib/modules/3.13.6-200.fc20.x86_64/kpatch/kpatch.ko
$ sudo insmod /usr/local/lib/modules/$(uname -r)/kpatch/kpatch.ko
insmod: ERROR: could not insert module /usr/local/lib/modules/3.13.6-200.fc20.x86_64/kpatch/kpatch.ko: Invalid module format
$ dmesg | tail
...
[60868.408750] kpatch: version magic '3.13.6-100.fc19.x86_64 SMP mod_unload ' should be '3.13.6-200.fc20.x86_64 SMP mod_unload '

I do re-compiled the kpatch core module and re-installed via make && sudo make install. But apparently it's not a clean one.

[jpoimboe]

Yeah, if you don't always do a make clean after a kernel update then the core module can get out of date.

I just fixed it with #88. It should be fixed now if you do a make && sudo make install with the latest master.

[lulinqing]

Thanks @jpoimboe , that sounds great.

Everything went well now after with a correct kpatch.ko loaded.

[jpoimboe]

Ok good!