So, good news. I pulled in the ubuntu kernel sources and applied the main patch I had previously identified (https://github.com/torvalds/linux/commit/c3cc39118c3610eb6ab4711bc624af7fc48a35fe). Looking at the other patch (https://github.com/torvalds/linux/commit/e27be240df53), that seems to be related to the accuracy of returned statistics which is not something that my testcase is going to show up.
I built a version of the 4.15.0-142 kernel with patch, and booted back into it, and with two iterations of my testcase my `nr_writeback` value has ended up on zero - which is excellent news. From previous runs it has never failed to leak, so this looks good to me. I will run it some more, but it is safe to say I am pretty happy at this point. To that end, I believe that https://github.com/torvalds/linux/commit/c3cc39118c3610eb6ab4711bc624af7fc48a35fe "mm: memcontrol: fix NR_WRITEBACK leak in memcg and system stats" does indeed fix this issue and the symptoms I have reported above. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1926081 Title: nr_writeback memory leak in kernel 4.15.0-137+ To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1926081/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
