Matthew Wilcox <willy@xxxxxxxxxxxxx> writes: > On Tue, Aug 03, 2021 at 04:14:38PM +0800, Huang, Ying wrote: >> Matthew Wilcox <willy@xxxxxxxxxxxxx> writes: >> > But I REALLY REALLY REALLY want a reproducer. Right now, I have a hard >> > time believing this, or any of the other races can really happen. >> >> I think the race is only theoretical too. Firstly, swapoff is a rare >> operations in practice; secondly, the race window is really small. > > So do something to provoke it. Widen the window. Put an msleep(1000) > between *pagep = NULL and the call to get_swap_device(). That's assuming > that the swapon/swapoff loop that I proposed doesn't work. Did you > try it? I haven't tried it. Do you agree that the race is possible in theory? But if you still really want it, I can try to do that. Best Regards, Huang, Ying
