Martin, Right now you get a message "BUG: non-zero pgtables_bytes on freeing mm: -16384" for EVERY process that exits in 4.19.5 and later. bisect points to commit 4136161d676a93fc8df6bdb80d720c15522d6c24 Author: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> Date: Mon Oct 15 11:09:16 2018 +0200 s390/mm: fix mis-accounting of pgtable_bytes [ Upstream commit e12e4044aede97974f2222eb7f0ed726a5179a32 ] Turns out that this patch requires several dependencies so the autoselection of this patch was missing that. Can we either revert this patch or add the dependencies? Christian