From owner-freebsd-current@FreeBSD.ORG Mon Jul 23 01:10:59 2007 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8CFC516A418 for ; Mon, 23 Jul 2007 01:10:59 +0000 (UTC) (envelope-from jmg@hydrogen.funkthat.com) Received: from hydrogen.funkthat.com (gate.funkthat.com [69.17.45.168]) by mx1.freebsd.org (Postfix) with ESMTP id 42D6113C45B for ; Mon, 23 Jul 2007 01:10:59 +0000 (UTC) (envelope-from jmg@hydrogen.funkthat.com) Received: from hydrogen.funkthat.com (yr10nqiu0zpf8z5t@localhost.funkthat.com [127.0.0.1]) by hydrogen.funkthat.com (8.13.6/8.13.3) with ESMTP id l6N1Awlf002856; Sun, 22 Jul 2007 18:10:58 -0700 (PDT) (envelope-from jmg@hydrogen.funkthat.com) Received: (from jmg@localhost) by hydrogen.funkthat.com (8.13.6/8.13.3/Submit) id l6N1AwXA002855; Sun, 22 Jul 2007 18:10:58 -0700 (PDT) (envelope-from jmg) Date: Sun, 22 Jul 2007 18:10:58 -0700 From: John-Mark Gurney To: Eric Anderson Message-ID: <20070723011058.GB99491@funkthat.com> Mail-Followup-To: Eric Anderson , freebsd-current@freebsd.org References: <469E3B7C.4020402@centtech.com> <20070722001514.GB1221@funkthat.com> <46A3CBCE.3000300@freebsd.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <46A3CBCE.3000300@freebsd.org> User-Agent: Mutt/1.4.2.1i X-Operating-System: FreeBSD 5.4-RELEASE-p6 i386 X-Files: The truth is out there X-URL: http://resnet.uoregon.edu/~gurney_j/ X-Resume: http://resnet.uoregon.edu/~gurney_j/resume.html Cc: freebsd-current@freebsd.org Subject: Re: processes stuck in kqread X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: John-Mark Gurney List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Jul 2007 01:10:59 -0000 Eric Anderson wrote this message on Sun, Jul 22, 2007 at 16:27 -0500: > John-Mark Gurney wrote: > >kevin kramer wrote this message on Wed, Jul 18, 2007 at 11:10 -0500: > >>I have been having issues for some time on -CURRENT. My latest update > >>was 7/11. I have identified these processes as being stuck in kqread > >>while waiting for them to continue. > >> > >>Processes that I know are a problem: > >>sshd - I can watch a login and the process goes from Select to kqread, > >>takes about 3-4 minutes to get a login prompt > >>top - takes about 2-3 minutes to come up > >>tar - never really even starts to read data in and stays in kqread > >> > >>Processes not affected: > >>scp > >>gstat > >>cvsup > >>make > >> > >>This machine is running AMD64 GENERIC kernel on a Dual-Core Xeons. > >>dmesg.txt and top-trace.txt here, > >>http://users.centtech.com/~kramer/snapshot > >> > >>What do I do to debug this? > > > >running the process under ktrace would help identify what it is waiting > >for... Though if it usually hangs for a minute or two in kqread, and > >then continues, it's probably a DNS lookup issue... > > > > > You mean like the one he put here: > > http://users.centtech.com/~kramer/snapshot/top-trace.txt /me needs to read closer. Thought it might be a yp issue: 84667 top 0.005085 CALL open(0x7fffffffdd00,O_RDONLY,0x1e) 84667 top 0.005091 NAMI "/var/yp/binding/centtech.com.2" 84667 top 0.005105 RET open -1 errno 2 No such file or directory [...] 84667 top 0.005461 CALL socket(PF_INET,SOCK_DGRAM,IPPROTO_UDP) 84667 top 0.005468 RET socket 5 [...] 84667 top 0.005533 CALL bind(0x5,0x7fffffffda10,0x10) 84667 top 0.005542 RET bind 0 [...] 84667 top 0.006028 CALL sendto(0x5,0x800c11ac4,0x38,0,0x800c11808,0x10) > 84667 top 0.006110 RET sendto 56/0x38 > 84667 top 0.006128 CALL > kevent(0x6,0x800c11910,0x1,0x7fffffffdad0,0x1,0x7fffffffdb10) > 84667 top 5.008057 GIO fd 6 wrote 32 bytes > 0x0000 0500 0000 0000 0000 ffff 0100 0000 0000 0000 0000 0000 > 0000 0000 0000 0000 0000 > |................................| > > 84667 top 5.008073 GIO fd 6 read 0 bytes > "" > 84667 top 5.008078 RET kevent 0 > 84667 top 5.008086 CALL gettimeofday(0x7fffffffdb20,0) > 84667 top 5.008091 RET gettimeofday 0 > 84667 top 5.008096 CALL > sendto(0x5,0x800c11ac4,0x38,0,0x800c11808,0x10) > 84667 top 5.008139 GIO fd 5 wrote 56 bytes > 0x0000 4696 2a64 0000 0000 0000 0002 0001 86a0 0000 0002 0000 > 0003 0000 0000 0000 0000 0000 0000 0000 0000 > |F.*d....................................| > 0x0028 0001 86a7 0000 0002 0000 0006 0000 0000 > |................| > > 84667 top 5.008155 RET sendto 56/0x38 > 84667 top 5.008163 CALL > kevent(0x6,0x800c11910,0,0x7fffffffdad0,0x1,0x7fffffffdb10) > 84667 top 15.007883 GIO fd 6 wrote 0 bytes > "" Looks like it's trying to contact the yp server and isn't getting a response... Check your user/host name lookup... -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."