From owner-freebsd-questions@FreeBSD.ORG Thu Oct 10 14:08:06 2013 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 869A48A1 for ; Thu, 10 Oct 2013 14:08:06 +0000 (UTC) (envelope-from mexas@bristol.ac.uk) Received: from eu1sys200aog118.obsmtp.com (eu1sys200aog118.obsmtp.com [207.126.144.145]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id DF22A2ED0 for ; Thu, 10 Oct 2013 14:08:05 +0000 (UTC) Received: from mail-wg0-f45.google.com ([74.125.82.45]) (using TLSv1) by eu1sys200aob118.postini.com ([207.126.147.11]) with SMTP ID DSNKUla0ps/hdoXjSI8q6/CtumkLyFOwTolT@postini.com; Thu, 10 Oct 2013 14:08:06 UTC Received: by mail-wg0-f45.google.com with SMTP id z12so1263759wgg.0 for ; Thu, 10 Oct 2013 07:07:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:sender:date:from:message-id:to:subject:reply-to; bh=HhCTY+JILY3BrLGg3EQ6txwEtyuauegCd2DAWA0iDbs=; b=QC1fADWC5PvLvT8iXzQeG5sLQt5I37PbmuhIKPu6ut432aENHFOYUuVK+8thCPcq1d 8YDQ5DOIEzZOuQoylaeYPRQIztTrtiKarA0KknbcnuhNxHbwFGSVQdy8bW0iui8+q5zP V1LNZuWl/nO+/1rsHMBNTX4rTD8E/kzEw+iysrUYIFqOUpVn08QrHnyx3+pM4lFjJI+D JM3cJE3YLdseATHI7uDm4le996j4bclkEF3orkzyHYNrTUhk3aMCqRUiGRFJ3WhkdV2m ABOEGEKKdjApCDBfobMHrF52FuXLP5Cs27btx50rDYmDBPwmdmU54wdakQP0eFoyJLko Kr4w== X-Gm-Message-State: ALoCoQnLumwyJOe6iQosJymEZZYIlP0LJXJJf5+d6/AWyXCeKnO2gdztR1d0XuESj2DOL6tN+UsPfb+YMQbCUhW2DcDdhD10zMqbAugM4XRCiSoHIpBufGPmOJMD4STAQSYOkKEvq1jekFBchalDv0AJTZBUwC0doREwwMij6i5e+oo4/A5KTmWOzLqnwnngWGnthqTyv/2M X-Received: by 10.180.98.105 with SMTP id eh9mr7985887wib.56.1381414054711; Thu, 10 Oct 2013 07:07:34 -0700 (PDT) X-Received: by 10.180.98.105 with SMTP id eh9mr7985874wib.56.1381414054431; Thu, 10 Oct 2013 07:07:34 -0700 (PDT) Received: from mech-cluster241.men.bris.ac.uk (mech-cluster241.men.bris.ac.uk. [137.222.187.241]) by mx.google.com with ESMTPSA id b13sm25823572wic.9.1969.12.31.16.00.00 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 10 Oct 2013 07:07:32 -0700 (PDT) Sender: Anton Shterenlikht Received: from mech-cluster241.men.bris.ac.uk (localhost [127.0.0.1]) by mech-cluster241.men.bris.ac.uk (8.14.7/8.14.6) with ESMTP id r9AE7UBK069317 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Thu, 10 Oct 2013 15:07:30 +0100 (BST) (envelope-from mexas@mech-cluster241.men.bris.ac.uk) Received: (from mexas@localhost) by mech-cluster241.men.bris.ac.uk (8.14.7/8.14.6/Submit) id r9AE7UeX069316 for freebsd-questions@freebsd.org; Thu, 10 Oct 2013 15:07:30 +0100 (BST) (envelope-from mexas) Date: Thu, 10 Oct 2013 15:07:30 +0100 (BST) From: Anton Shterenlikht Message-Id: <201310101407.r9AE7UeX069316@mech-cluster241.men.bris.ac.uk> To: freebsd-questions@freebsd.org Subject: Expensive timeout(9) function: 0x9ffc000000b59d80(0) 0.060724954 s X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list Reply-To: mexas@bris.ac.uk List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Oct 2013 14:08:06 -0000 I see on the console: lock order reversal: 1st 0xe000000012c58a28 ufs (ufs) @ /usr/src/sys/fs/nullfs/null_vnops.c:620 2nd 0x9ffc000000c32360 allproc (allproc) @ /usr/src/sys/kern/kern_descrip.c:2780 KDB: stack backtrace: db_trace_self(0x9ffc0000000c9ec0) at db_trace_self+0x40 db_trace_self_wrapper(0x9ffc0000004da9c0) at db_trace_self_wrapper+0x70 kdb_backtrace(0x9ffc000000c0c218, 0x9ffc0000005108d0) at kdb_backtrace+0xc0 _witness_debugger(0x1, 0x9ffc000000b0edd8, 0x9ffc0000005142a0, 0xb9d, 0x9ffc000000afae08) at _witness_debugger+0x60 witness_checkorder(0x9ffc000000c32360, 0x9ffc000000b0e728, 0x9ffc000000afae08, 0xadc, 0x0) at witness_checkorder+0x15b0 _sx_slock(0x9ffc000000c32360, 0x0, 0x9ffc000000afae08, 0xadc) at _sx_slock+0x120 mountcheckdirs(0xe000000015ee04e0, 0xe000000015ee0750, 0xa0000000905bd280, 0xe000000015ee04e0, 0x9ffc0000005afd70, 0x592, 0x592) at mountcheckdirs+0x60 dounmount(0xe000000015ee0750, 0x8080000, 0xe00000001276c480, 0x0, 0x0, 0xa0000000905bd2a0, 0x1000, 0x80000) at dounmount+0x920 sys_unmount(0xe00000001276c480, 0x0, 0xe000000015ede3c8, 0xe000000012ec5800) at sys_unmount+0x6d0 syscall(0xe000000015fe0de0, 0x8080000, 0x1000055a8, 0xe00000001276c480, 0x0, 0x0, 0x9ffc00000098db00, 0x8) at syscall+0x5e0 epc_syscall_return() at epc_syscall_return Expensive timeout(9) function: 0x9ffc000000b4e600(0xa0000000009ed320) 0.051850651 s Expensive timeout(9) function: 0x9ffc000000b59d80(0) 0.060724954 s I'm not interested in LOR, but in the last 2 lines. What is this "expensive" about? Should I worry? Thanks Anton