On Mon, Aug 17, 2020 at 11:19:26AM -0400, Chuck Lever wrote: > Dan Aloni reports that when a server disconnects abruptly, a few > memory regions are left DMA mapped. Over time this leak could pin > enough I/O resources to slow or even deadlock an NFS/RDMA client. > > I found that if a transport disconnects before pending Send and > FastReg WRs can be posted, the to-be-registered MRs are stranded on > the req's rl_registered list and never released -- since they > weren't posted, there's no Send completion to DMA unmap them. > > Reported-by: Dan Aloni <dan@xxxxxxxxxxxx> > Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx> > --- > net/sunrpc/xprtrdma/verbs.c | 2 ++ > 1 file changed, 2 insertions(+) > > Hi Dan, does this help? Yeah, works as expected with your fix. Thanks! -- Dan Aloni
