From owner-freebsd-current@FreeBSD.ORG Tue Dec 18 20:19:32 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 A6FB216A420; Tue, 18 Dec 2007 20:19:32 +0000 (UTC) (envelope-from jroberson@chesapeake.net) Received: from webaccess-cl.virtdom.com (webaccess-cl.virtdom.com [216.240.101.25]) by mx1.freebsd.org (Postfix) with ESMTP id 5DAD613C45A; Tue, 18 Dec 2007 20:19:32 +0000 (UTC) (envelope-from jroberson@chesapeake.net) Received: from [192.168.1.107] (cpe-24-94-75-93.hawaii.res.rr.com [24.94.75.93]) (authenticated bits=0) by webaccess-cl.virtdom.com (8.13.6/8.13.6) with ESMTP id lBIKJTLR078052; Tue, 18 Dec 2007 15:19:30 -0500 (EST) (envelope-from jroberson@chesapeake.net) Date: Tue, 18 Dec 2007 10:20:21 -1000 (HST) From: Jeff Roberson X-X-Sender: jroberson@desktop To: Ed Maste In-Reply-To: <20071218194312.GB40055@sandvine.com> Message-ID: <20071218101806.J899@desktop> References: <20071218194312.GB40055@sandvine.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: bzeeb+freebsd+lor@zabbadoz.net, freebsd-current@freebsd.org Subject: Re: LOR kqueue / sleep mtxpool for LOR list X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Dec 2007 20:19:32 -0000 On Tue, 18 Dec 2007, Ed Maste wrote: > I just saw this LOR during startup of an application while testing > 8-CURRENT on a dev box. I've done no investigation yet. > > FreeBSD TPC-D13-08.phaedrus 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Mon Dec 17 16:27:54 EST 2007 emaste@bsd-build3.phaedrus:/d2/emaste/HEAD/obj/d2/emaste/HEAD/src/sys/GENERIC i386 > > lock order reversal: > 1st 0xc42b7580 kqueue (kqueue) @ /d2/emaste/HEAD/src/sys/kern/kern_event.c:1397 > 2nd 0xc3ece8e0 sleep mtxpool (sleep mtxpool) @ /d2/emaste/HEAD/src/sys/kern/sys_generic.c:1255 > KDB: stack backtrace: > db_trace_self_wrapper(c0b08871,e683aaa4,c079cafe,c0b0ade3,c3ece8e0,...) at db_trace_self_wrapper+0x26 > kdb_backtrace(c0b0ade3,c3ece8e0,c0b043d7,c0b043d7,c0b0b09a,...) at kdb_backtrace+0x29 > witness_checkorder(c3ece8e0,9,c0b0b09a,4e7,c42b7580,...) at witness_checkorder+0x6de > _mtx_lock_flags(c3ece8e0,0,c0b0b09a,4e7,40,...) at _mtx_lock_flags+0xbc > selrecord(c4474220,c42b75ac,c0b01a8d,575,c42b7580,...) at selrecord+0x9d > kqueue_poll(c4341cf0,40,c46f4000,c4474220,e683ab74,...) at kqueue_poll+0x65 > poll(c4474220,e683acfc,c,e683ad38,c0bb84b8,...) at poll+0x2cc > syscall(e683ad38) at syscall+0x2b3 > Xint0x80_syscall() at Xint0x80_syscall+0x20 > --- syscall (209, FreeBSD ELF32, poll), eip = 0x287451db, esp = 0x8672f3c, ebp = 0x8672f98 --- > Thanks, this is interesting. The mtxpool should always be the leaf. The opposite order is the bug. Can you add them to the static order list and tell me where the reverse order is observed? Thanks, Jeff > -Ed > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" >