[$] An Ubuntu kernel bug causes container crashes

Some system administrators running Ubuntu 20.04 had a rough time onJune 8, when Ubuntu published kernel packages containing a particularlynasty bug that was caused by an Ubuntu-specificpatch to the kernel. The bug led to a kernel panic whenever a Docker containerwas started. Fixed packages were made available on June 10, but thereare questions about what went wrongwith handling the patch; in particular, it is surprising that kernel 5.13,which has been beyond its end-of-lifefor months, made it onto machines running Ubuntu 20.04, which is supposedto be a long-term support release.