On Sun, Aug 23, 2020 at 02:27:05PM +0200, gregkh@xxxxxxxxxxxxxxxxxxx wrote: > > The patch below does not apply to the 5.8-stable tree. > If someone wants it applied there, or to any other stable or longterm > tree, then please email the backport, including the original git commit > id to <stable@xxxxxxxxxxxxxxx>. > > thanks, > > greg k-h > > ------------------ original commit in Linus's tree ------------------ > > From b5331379bc62611d1026173a09c73573384201d9 Mon Sep 17 00:00:00 2001 > From: Will Deacon <will@xxxxxxxxxx> > Date: Tue, 11 Aug 2020 11:27:25 +0100 > Subject: [PATCH] KVM: arm64: Only reschedule if MMU_NOTIFIER_RANGE_BLOCKABLE > is not set > > When an MMU notifier call results in unmapping a range that spans multiple > PGDs, we end up calling into cond_resched_lock() when crossing a PGD boundary, > since this avoids running into RCU stalls during VM teardown. Unfortunately, > if the VM is destroyed as a result of OOM, then blocking is not permitted > and the call to the scheduler triggers the following BUG(): This is in the same boat as: https://lore.kernel.org/r/20200824112156.GA24319@willie-the-truck so please drop it from the stable queues while I cook some backports for you. Thanks, Will
