From owner-freebsd-net@freebsd.org Tue Mar 30 13:36:49 2021 Return-Path: Delivered-To: freebsd-net@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 6A8CD5C581A for ; Tue, 30 Mar 2021 13:36:49 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (mailman.nyi.freebsd.org [IPv6:2610:1c1:1:606c::50:13]) by mx1.freebsd.org (Postfix) with ESMTP id 4F8r8K2PpXz4jMf for ; Tue, 30 Mar 2021 13:36:49 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 529935C556B; Tue, 30 Mar 2021 13:36:49 +0000 (UTC) Delivered-To: net@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 525EF5C50F9 for ; Tue, 30 Mar 2021 13:36:49 +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 4F8r8K1kT8z4j3W for ; Tue, 30 Mar 2021 13:36:49 +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 2E79C27520 for ; Tue, 30 Mar 2021 13:36:49 +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 12UDanJT017825 for ; Tue, 30 Mar 2021 13:36:49 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 12UDaniE017824 for net@FreeBSD.org; Tue, 30 Mar 2021 13:36:49 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: net@FreeBSD.org Subject: [Bug 254333] [tcp] sysctl net.inet.tcp.hostcache.list hangs Date: Tue, 30 Mar 2021 13:36:49 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 11.4-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: maxim.shalomikhin@kaspersky.com X-Bugzilla-Status: In Progress X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: rscheff@freebsd.org X-Bugzilla-Flags: mfc-stable13? mfc-stable12? mfc-stable11? 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 MIME-Version: 1.0 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Mar 2021 13:36:49 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D254333 --- Comment #12 from Maxim Shalomikhin --- I have one machine with hanging sysct: 99750 - D 22:33.32 /sbin/sysctl net.inet.tcp.hostcache.list # procstat -kk 99750 PID TID COMM TDNAME KSTACK 99750 101008 sysctl - mi_switch+0xe1 sleepq_wait+0x2c _cv_wait+0x115 vmem_xalloc+0x44b vmem_alloc+0x31 kmem_malloc+0x33 uma_large_malloc+0x46 malloc+0x3d sbuf_new+0x105 sysctl_tcp_hc_list+0x6d sysctl_root_handler_locked+0x8a sysctl_root+0x1ee userland_sysctl+0x134 sys___sysctl+0x5f amd64_syscall+0xa4e fast_syscall_common+0x101 As for cachelimit: Yes, we have large number set, but I noticed, then sysctl hangs, the hostcache.count goes crazy big (and stops near 2^32 at 429496644= 7): # sysctl net.inet.tcp.hostcache net.inet.tcp.hostcache.purgenow: 0 net.inet.tcp.hostcache.purge: 0 net.inet.tcp.hostcache.prune: 300 net.inet.tcp.hostcache.expire: 3600 net.inet.tcp.hostcache.count: 4294966447 net.inet.tcp.hostcache.bucketlimit: 30 net.inet.tcp.hostcache.hashsize: 65536 net.inet.tcp.hostcache.cachelimit: 1966080 net.inet.tcp.hostcache.enable: 1 # vmstat -m | grep sbuf sbuf 1 1K - 68235=20 16,32,64,128,256,512,1024,2048,4096,8192,32768,65536 mrsasbuf 949 2860K - 951 32,128,256,2048,8192 Usually, hostcache.count is about ~500k. So, Is it just my fault setting cachelimit to high or this is a bug in sync= ache with hostcache.count? --=20 You are receiving this mail because: You are on the CC list for the bug.=