12efcc2dee
In Linux 4.19 there has been a major rework of the overlayfs implementation and it now opens files in lowerdir with O_NOATIME, which in turn caused issues in our VM tests because the process owner of QEMU doesn't match the file owner of the lowerdir. The crux here is that 9p propagates the O_NOATIME flag to the host and the guest kernel has no way of verifying whether that flag will lead to any problems beforehand. There is ongoing work to possibly fix this in the kernel, but it will take a while until there is a working patch and consensus. So in order to bring our default kernel back to 4.19 and of course make it possible to run newer kernels in VM tests, I'm merging a small QEMU patch as an interim solution, which we can drop once we have a working fix in the next round of stable kernels. Now we already had Linux 4.19 set as the default kernel, but that was subsequently reverted in 048c36ccaa0add5e5de387e9de0d3775d3fdd10d because the patch we have used was the revert of the commit I bisected a while ago. This patch broke overlayfs in other ways, so I'm also merging in a VM test by @bachp, which only tests whether overlayfs is working, just to be on the safe side that something like this won't happen in the future. Even though this change could be considered a moderate mass-rebuild at least for GNU/Linux, I'm merging this to master, mainly to give us some time to get it into the current 19.03 release branch (and subsequent testing window) once we got no new breaking builds from Hydra. Cc: @samueldr, @lheckemann Fixes: https://github.com/NixOS/nixpkgs/issues/54509 Fixes: https://github.com/NixOS/nixpkgs/issues/48828 Merges: https://github.com/NixOS/nixpkgs/pull/57641 Merges: https://github.com/NixOS/nixpkgs/pull/54508 |
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*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.