From owner-freebsd-questions@FreeBSD.ORG Fri Oct 19 15:15:10 2007 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 535D416A418 for ; Fri, 19 Oct 2007 15:15:10 +0000 (UTC) (envelope-from Andrew.Liles@lbi.com) Received: from mail80.messagelabs.com (mail80.messagelabs.com [195.245.230.163]) by mx1.freebsd.org (Postfix) with SMTP id B472A13C442 for ; Fri, 19 Oct 2007 15:15:09 +0000 (UTC) (envelope-from Andrew.Liles@lbi.com) X-VirusChecked: Checked X-Env-Sender: Andrew.Liles@lbi.com X-Msg-Ref: server-11.tower-80.messagelabs.com!1192805304!51596014!1 X-StarScan-Version: 5.5.12.14.2; banners=.,-,- X-Originating-IP: [82.109.92.198] Received: (qmail 25889 invoked from network); 19 Oct 2007 14:48:25 -0000 Received: from unknown (HELO aristotle) (82.109.92.198) by server-11.tower-80.messagelabs.com with SMTP; 19 Oct 2007 14:48:25 -0000 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Date: Fri, 19 Oct 2007 15:49:06 +0100 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: FreeBSD hang without panic Thread-Index: AcgSXzK9FKShds1VSd2y6xl7mBnEGg== From: "Andrew Liles" To: Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: FreeBSD hang without panic X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Oct 2007 15:15:10 -0000 On=20a=20FreeBSD=205.2.1=20box=20that=20has=20been=20in=20production=20a=20= long=20time,=20I=20have=20had a=20new=20type=20of=20hang=20on=20two=20days=20this=20week,=20the=20type=20= of=20which=20I=20have=20not seen=20before.=20=20(No=20recent=20software/hardware=20changes). Symptom:=20The=20machine=20is=20a=20web/email=20server=20only.=20=20It=20s= tops=20receiving=20new SSH/HTTP/IMAP/POP=20connections,=20existing=20shells=20cease=20working. On=20the=20machine=20itself=20no=20messages=20are=20shown=20and=20the=20ma= chine=20responds=20to repeated=20ENTER=20key=20presses=20with=20the=20login=20prompt.=20=20Once=20= you=20enter=20"root" [ENTER]=20then=20no=20further=20responses=20(except=20line=20feeds=20as=20= you=20press=20ENTER). What=20kind=20of=20hang=20is=20this?=20Could=20it=20be=20a=20DoS=20attack?= =20Or=20is=20it=20some internal=20process=20hanging?=20=20I=20have=20a=20debug=20kernel=20but=20a= s=20the=20only=20solution is=20a=20power-off=20reset,=20I=20never=20get=20any=20dump. Any=20suggestions=20please=20where=20I=20might=20start=20to=20look,=20or=20= services=20to experiment=20disabling? ______________________________________________________________________ This=20email=20has=20been=20scanned=20by=20the=20MessageLabs=20Email=20Sec= urity=20System. For=20more=20information=20please=20visit=20http://www.messagelabs.com/ema= il=20 ______________________________________________________________________