I think I might have found the "source" of the problem. https://github.com/torvalds/linux/commit/40576e5e63ea5eeab814de7af83ad09dd64134ee
Replacing the gcc-7 version with gcc-8 seems to "fix" the problem root@ubuntu_base:~/builderr# uname -a Linux ubuntu_base 5.4.0-050400rc5-generic #201910271430 SMP Sun Oct 27 18:33:09 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux root@ubuntu_base:~/builderr# gcc --version gcc (Ubuntu 8.3.0-6ubuntu1~18.04.1) 8.3.0 Copyright (C) 2018 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. root@ubuntu_base:~/builderr# make -C /lib/modules/5.4.0-050400rc5-generic/build/ M=$PWD make: Entering directory '/usr/src/linux-headers-5.4.0-050400rc5-generic' AR /root/builderr/built-in.a CC [M] /root/builderr/conftest.o Building modules, stage 2. MODPOST 1 modules CC [M] /root/builderr/conftest.mod.o LD [M] /root/builderr/conftest.ko make: Leaving directory '/usr/src/linux-headers-5.4.0-050400rc5-generic' -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1849348 Title: linux 5.4-rc4 Unable to build simple kernel module To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1849348/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
