Commits on Mar 21, 2019

1. Merge overlayfs fix, LTS kernel bump and test …

   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 048c36c
   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: #54509
   Fixes: #48828
   Merges: #57641
   Merges: #54508
   (cherry picked from commit 12efcc2)

   

   aszlig committed Mar 21, 2019
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