From owner-freebsd-stable@FreeBSD.ORG Tue Nov 15 03:57:00 2005 Return-Path: X-Original-To: stable@freebsd.org Delivered-To: freebsd-stable@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 2707A16A41F for ; Tue, 15 Nov 2005 03:57:00 +0000 (GMT) (envelope-from dwhite@gumbysoft.com) Received: from carver.gumbysoft.com (carver.gumbysoft.com [66.220.23.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id E44C443D45 for ; Tue, 15 Nov 2005 03:56:59 +0000 (GMT) (envelope-from dwhite@gumbysoft.com) Received: by carver.gumbysoft.com (Postfix, from userid 1000) id BE37172DD4; Mon, 14 Nov 2005 19:56:59 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by carver.gumbysoft.com (Postfix) with ESMTP id B9AB072DCB for ; Mon, 14 Nov 2005 19:56:59 -0800 (PST) Date: Mon, 14 Nov 2005 19:56:59 -0800 (PST) From: Doug White To: stable@freebsd.org Message-ID: <20051114194857.I24063@carver.gumbysoft.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: Subject: umounting overlapping mount panics X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Nov 2005 03:57:00 -0000 Hey folks, I accidentally mounted a CDROM over itself when installing X. OK, no problem, umounted it and then started browsing the CD. Panic. The panic output: Fatal trap 12: page fault while in kernel mode fault virtual address = 0x0 fault code = supervisor read, page not present instruction pointer = 0x20:0xc05ffe4e stack pointer = 0x28:0xda969ad4 frame pointer = 0x28:0xda969ae8 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, def32 1, gran 1 processor eflags = interrupt enabled, resume, IOPL = 0 current process = 485 (csh) trap number = 12 panic: page fault The trace: #0 doadump () at pcpu.h:165 #1 0xc0638202 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:399 #2 0xc0638498 in panic (fmt=0xc084e5a2 "%s") at /usr/src/sys/kern/kern_shutdown.c:555 #3 0xc0807c30 in trap_fatal (frame=0xda969a94, eva=0) at /usr/src/sys/i386/i386/trap.c:831 #4 0xc080799b in trap_pfault (frame=0xda969a94, usermode=0, eva=0) at /usr/src/sys/i386/i386/trap.c:742 #5 0xc08075d9 in trap (frame= {tf_fs = 8, tf_es = 40, tf_ds = 40, tf_edi = -1040124992, tf_esi = 0, tf_ebp = -627664152, tf_isp = -627664192, tf_ebx = -1027565108, tf_edx = 2048, tf_ecx = 0, tf_eax = 1, tf_trapno = 12, tf_err = 0, tf_eip = -1067450802, tf_cs = 32, tf_eflags = 66182, tf_esp = 1, tf_ss = 0}) at /usr/src/sys/i386/i386/trap.c:432 #6 0xc07f6dca in calltrap () at /usr/src/sys/i386/i386/exception.s:139 #7 0xc05ffe4e in g_io_request (bp=0xc2c099cc, cp=0xc200f3c0) at /usr/src/sys/geom/geom_io.c:259 #8 0xc0602399 in g_vfs_strategy (bo=0x1, bp=0xcbed1d68) at /usr/src/sys/geom/geom_vfs.c:106 #9 0xc060a2d9 in cd9660_strategy (ap=0x1) at /usr/src/sys/isofs/cd9660/cd9660_vnops.c:755 #10 0xc0817a49 in VOP_STRATEGY_APV (vop=0xc08bd320, a=0xda969b3c) at vnode_if.c:1796 #11 0xc0681de8 in bufstrategy (bo=0xc1f883f0, bp=0x1) at vnode_if.h:928 #12 0xc067c78d in breadn (vp=0xc1f88330, blkno=0, size=2048, rablkno=0x0, rabsize=0x0, cnt=0, cred=0x0, bpp=0x1) at buf.h:415 #13 0xc067c6d0 in bread (vp=0xc1f88330, blkno=0, size=2048, cred=0x0, bpp=0xda969bc8) at /usr/src/sys/kern/vfs_bio.c:719 #14 0xc0606be5 in cd9660_blkatoff (vp=0x800, offset=0, res=0x0, bpp=0xda969c28) at /usr/src/sys/isofs/cd9660/cd9660_lookup.c:406 #15 0xc0609db2 in cd9660_readdir (ap=0xda969c90) at /usr/src/sys/isofs/cd9660/cd9660_vnops.c:513 #16 0xc0817754 in VOP_READDIR_APV (vop=0x1, a=0x800) at vnode_if.c:1427 #17 0xc0696e67 in getdirentries (td=0xc200e180, uap=0xda969d04) at vnode_if.h:746 #18 0xc0807f47 in syscall (frame= {tf_fs = 59, tf_es = 59, tf_ds = 59, tf_edi = 136507528, tf_esi = -1078307728, tf_ebp = -1078347096, tf_isp = -627663516, tf_ebx = 672974052, tf_edx = 0, tf_ecx = 0, tf_eax = 196, tf_trapno = 22, tf_err = 2, tf_eip = 672447091, tf_cs = 51, tf_eflags = 582, tf_esp = -1078347140, tf_ss = 59}) at /usr/src/sys/i386/i386/trap.c:976 #19 0xc07f6e1f in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:200 #20 0x00000033 in ?? () Previous frame inner to this frame (corrupt stack?) Reproduction case: mount /cdrom mount /cdrom ls /cdrom umount /cdrom ls /cdrom *panic* -- Doug White | FreeBSD: The Power to Serve dwhite@gumbysoft.com | www.FreeBSD.org