From owner-freebsd-arm@FreeBSD.ORG Sat Sep 15 04:50:41 2012 Return-Path: Delivered-To: arm@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id D1AAB106566B for ; Sat, 15 Sep 2012 04:50:41 +0000 (UTC) (envelope-from jmg@h2.funkthat.com) Received: from h2.funkthat.com (gate2.funkthat.com [208.87.223.18]) by mx1.freebsd.org (Postfix) with ESMTP id A217B8FC08 for ; Sat, 15 Sep 2012 04:50:41 +0000 (UTC) Received: from h2.funkthat.com (localhost [127.0.0.1]) by h2.funkthat.com (8.14.3/8.14.3) with ESMTP id q8F4oeaD042581 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 14 Sep 2012 21:50:40 -0700 (PDT) (envelope-from jmg@h2.funkthat.com) Received: (from jmg@localhost) by h2.funkthat.com (8.14.3/8.14.3/Submit) id q8F4oev0042580; Fri, 14 Sep 2012 21:50:40 -0700 (PDT) (envelope-from jmg) Date: Fri, 14 Sep 2012 21:50:40 -0700 From: John-Mark Gurney To: Alan Cox Message-ID: <20120915045040.GZ58312@funkthat.com> Mail-Followup-To: Alan Cox , "arm@freebsd.org" References: <502FD67A.7030003@rice.edu> <1345315508.27688.260.camel@revolution.hippie.lan> <503D12AE.1050705@rice.edu> <1346350374.1140.525.camel@revolution.hippie.lan> <5045351F.6060201@rice.edu> <1346723041.1140.602.camel@revolution.hippie.lan> <504B85BE.3030101@rice.edu> <1347316458.1137.41.camel@revolution.hippie.lan> <504F8BAC.4040902@rice.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <504F8BAC.4040902@rice.edu> User-Agent: Mutt/1.4.2.3i X-Operating-System: FreeBSD 7.2-RELEASE i386 X-PGP-Fingerprint: 54BA 873B 6515 3F10 9E88 9322 9CB1 8F74 6D3F A396 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 X-to-the-FBI-CIA-and-NSA: HI! HOW YA DOIN? can i haz chizburger? X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.2.2 (h2.funkthat.com [127.0.0.1]); Fri, 14 Sep 2012 21:50:40 -0700 (PDT) Cc: "arm@freebsd.org" Subject: Re: arm pmap locking X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting FreeBSD to the StrongARM Processor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 15 Sep 2012 04:50:41 -0000 Alan Cox wrote this message on Tue, Sep 11, 2012 at 14:06 -0500: > On 09/10/2012 17:34, Ian Lepore wrote: > >On Sat, 2012-09-08 at 12:51 -0500, Alan Cox wrote: > >>Here is another patch. This simplifies the kernel pmap locking in > >>pmap_enter_pv() and corrects some comments. > >> > >>Thanks in advance, > >>Alan > >> > >I'm afraid I'm not going to be able to do this any time soon. I bricked > >my DreamPlug last Friday (the bright side: the nandfs_newfs command in > >-current apparently works just fine when applied to real hardware rather > >than the simulator device). I haven't had any success in getting > >openocd to transfer a new uboot image to it. So I'm probably going to > >be without arm hardware that can run anything newer than 8.2 for a few > >weeks (until my new atmel eval board arrives). > > > > Thanks for letting me know. > > Could someone else here please test the attached patch? I figure since you've been looking at arm's pmap, that I should report to you a LOR that I observered recently on my armv6 board: lock order reversal: 1st 0xc1cf70b0 pmap (pmap) @ /usr/src.HEAD/sys/arm/arm/pmap-v6.c:673 2nd 0xc091e608 PV ENTRY (UMA zone) @ /usr/src.HEAD/sys/vm/uma_core.c:2084 KDB: stack backtrace: db_trace_self() at db_trace_self+0xc scp=0xc05a294c rlv=0xc025b298 (X_db_sym_numargs+0x1bc) rsp=0xc9d1a8fc rfp=0xc9d1aa18 X_db_sym_numargs() at X_db_sym_numargs+0x194 scp=0xc025b270 rlv=0xc0398340 (kdb_backtrace+0x3c) rsp=0xc9d1aa1c rfp=0xc9d1aa2c r4=0xc06bda44 kdb_backtrace() at kdb_backtrace+0xc scp=0xc0398310 rlv=0xc03ad3f8 (witness_display_spinlock+0x80) rsp=0xc9d1aa30 rfp=0xc9d1aa44 r4=0x00000001 witness_display_spinlock() at witness_display_spinlock+0x5c scp=0xc03ad3d4 rlv=0xc03ae6d8 (witness_checkorder+0x884) rsp=0xc9d1aa48 rfp=0xc9d1aa98 r5=0xc1cf70b0 r4=0xc06263d4 witness_checkorder() at witness_checkorder+0xc scp=0xc03ade60 rlv=0xc0355b9c (_mtx_lock_flags+0xcc) rsp=0xc9d1aa9c rfp=0xc9d1aabc r10=0xc1cf70b0 r9=0x00000000 r8=0xc091d6e0 r7=0xc0620730 r6=0x00000824 r5=0x00000000 r4=0xc091e608 _mtx_lock_flags() at _mtx_lock_flags+0xc scp=0xc0355adc rlv=0xc057d290 (uma_zalloc_arg+0x1a8) rsp=0xc9d1aac0 rfp=0xc9d1aafc r7=0xc091d748 r6=0x00000000 r5=0xc08fc0b8 r4=0xc0620730 uma_zalloc_arg() at uma_zalloc_arg+0xc scp=0xc057d0f4 rlv=0xc05abb04 (pmap_growkernel+0xf20) rsp=0xc9d1ab00 rfp=0xc9d1ab70 r10=0xc1cf70b0 r9=0x00000000 r8=0x00000000 r7=0x8122e032 r6=0x00000000 r5=0xc08fc0b8 r4=0x00000001 pmap_growkernel() at pmap_growkernel+0x3fc scp=0xc05aafe0 rlv=0xc05ac14c (pmap_enter+0x70) rsp=0xc9d1ab74 rfp=0xc9d1aba0 r10=0x00000007 r9=0x00000000 r8=0xc09885a8 r7=0xbffff000 r6=0xc08278c0 r5=0xc1cf70b0 r4=0xc06261e0 pmap_enter() at pmap_enter+0xc scp=0xc05ac0e8 rlv=0xc057ff44 (vm_fault_hold+0x1638) rsp=0xc9d1aba4 rfp=0xc9d1ad14 r10=0xc9d1ade4 r8=0x00000000 r7=0x00000002 r6=0x00000000 r5=0xc1cf7000 r4=0xc09885a8 vm_fault_hold() at vm_fault_hold+0xc scp=0xc057e918 rlv=0xc058054c (vm_fault+0x8c) rsp=0xc9d1ad18 rfp=0xc9d1ad3c r10=0xc9d1ade4 r9=0x00000002 r8=0x00000000 r7=0x00000002 r6=0xbffff000 r5=0xc1cf7000 r4=0xc1cf5000 vm_fault() at vm_fault+0xc scp=0xc05804cc rlv=0xc05b0ac8 (data_abort_handler+0x35c) rsp=0xc9d1ad40 rfp=0xc9d1ade0 r8=0xbffff000 r7=0xc1cf5000 r6=0x00000000 r5=0xc0626844 r4=0xc1cf3088 data_abort_handler() at data_abort_handler+0xc scp=0xc05b0778 rlv=0xc05a4150 (address_exception_entry+0x50) rsp=0xc9d1ade4 rfp=0xc9d1ae84 r10=0xc0682bde r9=0xc1cf3000 r8=0xc9d1aeac r7=0xc0682bde r6=0xc0682bd4 r5=0xc05f1648 r4=0xbfffffff exec_shell_imgact() at exec_shell_imgact+0x75c scp=0xc031d348 rlv=0xc033b68c (fork_exit+0x94) rsp=0xc9d1ae88 rfp=0xc9d1aea8 r10=0x00000000 r9=0x00000000 r8=0xc9d1aeac r7=0x00000000 r6=0xc031d33c r5=0xc1cf3000 r4=0xc1cf5000 fork_exit() at fork_exit+0xc scp=0xc033b604 rlv=0xc05afe44 (fork_trampoline+0x14) rsp=0xc9d1aeac rfp=0x00000000 r8=0x00000000 r7=0x8ffbf8ef r6=0xf5f7f4a9 r5=0x00000000 r4=0xc031d33c FreeBSD beaglebone 10.0-CURRENT FreeBSD 10.0-CURRENT #1 r240480: Thu Nov 3 14:57:01 PDT 2011 jmg@pcbsd-779:/usr/obj/arm.armv6/usr/src.HEAD/sys/helium arm Do you need any more information? -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."