From nobody Fri Aug 20 18:24:14 2021 X-Original-To: bugs@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 1E401177A0B7 for ; Fri, 20 Aug 2021 18:24:14 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Grqly0CRRz4mfF for ; Fri, 20 Aug 2021 18:24:14 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id E3D351DDA7 for ; Fri, 20 Aug 2021 18:24:13 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 17KIODDP079992 for ; Fri, 20 Aug 2021 18:24:13 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 17KIODNQ079991 for bugs@FreeBSD.org; Fri, 20 Aug 2021 18:24:13 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 257318] uma consumes memory when reattaching device Date: Fri, 20 Aug 2021 18:24:14 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 13.0-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: jcaplan@blackberry.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Bug reports List-Archive: https://lists.freebsd.org/archives/freebsd-bugs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-bugs@freebsd.org MIME-Version: 1.0 X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D257318 --- Comment #1 from jcaplan@blackberry.com --- Just to add a bit more detail. A single iteration might look like this: # sysctl vm.uma_kmem_total vm.uma_kmem_total: 26247168 #devctl attach pci0:3:0:0 #devctl detach pci0:3:0:0 # sysctl vm.uma_kmem_total=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20 vm.uma_kmem_total: 26251264 Comparing the output before and after for vmstat -m shows that there is no change in dynamic memory allocated from malloc(). However we see from vm.uma_kmem_total that the UMA is gradually consuming m= ore memory, and a diff of vmstat -z shows several changes in zone allocations at the UMA layer. It appears that all allocations are accounted for at the malloc level yet t= here is a continuous slow leak of additional pages allocated at the UMA level. I'm not sure there's anything particularly special about mounting/unmountin= g, it's just an obviously reversible operation that allocates and then frees a= lot of memory. So it's possible this is a specific instance of a more general problem. --=20 You are receiving this mail because: You are the assignee for the bug.=