Done Point 1) above WORKS on zen3, haswell, and ivybridge. That means disabled 'CONFIG_UBSAN_TRAP' in the kernel config prior to building. Just nano or vim into the ".config" and put a '#' in front of the line to disable it. before running "$ make olddefconfig"
I built the kernel using LLVM-13 and LTO thin with O3 optimisation with -march=<cpuType> Point 2) above FAILED on ivybridge. I didn't bother trying to build it for other march types. It was built using the Ubuntu mainline config for 5.14.14 with the debian pems removed for a custom kernel build. "CONFIG_UBSAN_TRAP" is enabled by default in the Ubuntu kernel config. I built the kernel using GCC-11.1 with O3 optimisation with -march=<cpuType> I highly recommend that Ubuntu Mainline Kernel team DISABLE "CONFIG_UBSAN_TRAP" from their mainline kernel config as it can FAIL production kernels as that option forces what otherwise would have been a harmless warning into an error and possibly an abort or kernel panic of some sort. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1942684 Title: Kernel 5.14.X / 5.13.14 fails to boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1942684/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
