On Mon, Oct 05, 2020 at 01:39:21AM +0300, Jarkko Sakkinen wrote: > On Sat, Oct 03, 2020 at 01:23:49PM -0500, Haitao Huang wrote: > > On Sat, 03 Oct 2020 08:32:45 -0500, Jarkko Sakkinen > > <jarkko.sakkinen@xxxxxxxxxxxxxxx> wrote: > > > > > On Sat, Oct 03, 2020 at 12:22:47AM -0500, Haitao Huang wrote: > > > > When I turn on CONFIG_PROVE_LOCKING, kernel reports following > > > > suspicious RCU > > > > usages. Not sure if it is an issue. Just reporting here: > > > > > > I'm glad to hear that my tip helped you to get us the data. > > > > > > This does not look like an issue in the page reclaimer, which was not > > > obvious for me before. That's a good thing. I was really worried about > > > that because it has been very stable for a long period now. The last > > > bug fix for the reclaimer was done in June in v31 version of the patch > > > set and after that it has been unchanged (except possibly some renames > > > requested by Boris). > > > > > > I wildly guess I have a bad usage pattern for xarray. I migrated to it > > > in v36, and it is entirely possible that I've misused it. It was the > > > first time that I ever used it. Before xarray we had radix_tree but > > > based Matthew Wilcox feedback I did a migration to xarray. > > > > > > What I'd ask you to do next is to, if by any means possible, to try to > > > run the same test with v35 so we can verify this. That one still has > > > the radix tree. > > > > > > > > > v35 does not cause any such warning messages from kernel > > Thank you. Looks like Matthew already located the issue, a fix will > land soon. Just acknowledging that this should be fixed in my master branch now. /Jarkko
