On Wed, Oct 31, 2018 at 11:09:44AM +0100, Heiko Carstens wrote: > On Wed, Oct 31, 2018 at 07:31:49AM +0100, Martin Schwidefsky wrote: > > Thanks for testing. Unfortunately Heiko reported another issue yesterday > > with the patch applied. This time the other way around: > > > > BUG: non-zero pgtables_bytes on freeing mm: -16384 > > > > I am trying to understand how this can happen. For now I would like to > > keep the patch on hold in case they need another change. > > FWIW, Kirill: is there a reason why this "BUG:" output is done with > pr_alert() and not with VM_BUG_ON() or one of the WARN*() variants? > > That would to get more information with DEBUG_VM and / or > panic_on_warn=1 set. At least for automated testing it would be nice > to have such triggers. Stack trace is not helpful there. It will always show the exit path which is useless. -- Kirill A. Shutemov
