On Sat, Oct 12, 2024 at 07:29:42AM GMT, Sasha Levin wrote: > From: Kent Overstreet <kent.overstreet@xxxxxxxxx> > > [ Upstream commit b2f11c6f3e1fc60742673b8675c95b78447f3dae ] > > If we need to increase the tree depth, allocate a new node, and then > race with another thread that increased the tree depth before us, we'll > still have a preallocated node that might be used later. > > If we then use that node for a new non-root node, it'll still have a > pointer to the old root instead of being zeroed - fix this by zeroing it > in the cmpxchg failure path. > > Signed-off-by: Kent Overstreet <kent.overstreet@xxxxxxxxx> > Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> there wasn't any need to backport this, bcachefs is the only thing that uses genradix in multithreaded mode
