Date: Wed, 09 Jun 2021 18:31:28 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 256507] Apparent kernel memory leak in 12-STABLE r368820 Message-ID: <bug-256507-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D256507 Bug ID: 256507 Summary: Apparent kernel memory leak in 12-STABLE r368820 Product: Base System Version: 12.2-STABLE Hardware: amd64 OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: dave@jetcafe.org Created attachment 225666 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D225666&action= =3Dedit Memory graph Consider the following output: # sysctl vm.stats.vm | grep count vm.stats.vm.v_cache_count: 0 vm.stats.vm.v_user_wire_count: 0 vm.stats.vm.v_laundry_count: 0 vm.stats.vm.v_inactive_count: 121191 vm.stats.vm.v_active_count: 20836 vm.stats.vm.v_wire_count: 754310 vm.stats.vm.v_free_count: 254711 vm.stats.vm.v_page_count: 3993253 It should be pretty clear that these numbers do not add up. There are missi= ng memory pages.=20 I have some detailed statistics of this machine in prometheus. A graph of t= he issue is attached. I calculate "lost memory" by simply adding up all the _c= ount variables except v_page_count, and then subtracting that sum from v_page_co= unt. You will note that over time, the system gradually loses free memory. Eventually this machine will start swapping and then exhaust swap space and hang. This is one example from a machine that is running relatively few services. It is not running ZFS. However, I observe the same behavior on a = few other machines with disparate services and some of those are running ZFS. I have spent some time asking on lists and looking at various sysctl values= to try to determine whether I am missing something or not. I was unable to find anything relevant, and having come to the freebsd-stable list to find two others experiencing this issue, I'm filing this bug.=20 Any data anyone needs, just ask me. I actually use prometheus_sysctl_export= er (thanks for that btw!). Thanks in advance. :) --=20 You are receiving this mail because: You are the assignee for the bug.=
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