Hi Brendan, Thanks for testing! Glad that 5.0 and 5.8 works, so this is already fixed.
For now, I'd suggest bisecting with the already available/built kernel packages from the launchpad archive, which should be faster; then eventually get down to git to identify it more closely. Since you know that 4.18.0-25 fails and 5.0.0-13 works, I'd suggest you take the available built deb files from the Disco linux package archive, which has some 4.18, 4.19, and 5.0 packages. https://launchpad.net/ubuntu/disco/+source/linux Click on the desired version number in 'Releases in Ubuntu' (duplicates are OK) Click on 'amd64' in 'Builds' Download the required .deb files (watch out for .ddeb and .udeb) in 'Built files' Install them with 'sudo dpkg -i *.deb' as usual And then you can iterate/bisect with the available builds, which should help reduce the range of version tags to find the fix in git. As for building the kernel packages and the systemd failure, I would suggest you to use the Ubuntu kernel build process and configs instead of 'make deb-pkg' from upstream, which doesn't consider Ubuntu's stuff/configs in the tree, and might then give you some trouble. Ah, and building the Disco packages on a Disco container, so that build deps and release stuff are as expected. Steps follow below. Hope this helps. cheers, Mauricio ... # start a disco container lxc launch ubuntu:19.04 disco lxc shell disco # fixup apt sources and install build dependencies sed -i 's,http://.*.ubuntu.com,http://old-releases.ubuntu.com,' /etc/apt/sources.list sed -i 's/^# deb-src/deb-src/' /etc/apt/sources.list apt build-dep -y linux # select source/tag you'll build git clone ... # --reference ~/git/linux is handy/speedy if you have it already. cd ubuntu-disco git checkout Ubuntu-<version> # I'd suggest manually bisecting with tags # as a complete tag/package release is more # likely to work; git bisect might land you # in a commit that doesn't build/work well. # always build using the ubuntu configs and # stuff, w/ this procedure (reference below) # build LANG=C fakeroot debian/rules clean LANG=C fakeroot debian/rules binary-headers binary-generic binary-perarch # packages in ../*.deb # you'll likely need linux-image-unsigned, linux-modules, # possibly linux-modules-extra (storage/raid controllers mostly) # and linux-headers (two pkgs) if you build modules/dkms/nvidia. reference: https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1895563 Title: Kernel Oops: Rsyncing to bcache device w/o backing cache kernel panic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1895563/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
