Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 29 Nov 2000 11:15:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 29 Nov 2000 11:15:47 -0500 Received: from [64.64.109.142] ([64.64.109.142]:530 "EHLO quark.didntduck.org") by vger.kernel.org with ESMTP id ; Wed, 29 Nov 2000 11:15:40 -0500 Message-ID: <3A252464.2AB55600@didntduck.org> Date: Wed, 29 Nov 2000 10:44:36 -0500 From: Brian Gerst X-Mailer: Mozilla 4.73 [en] (WinNT; U) X-Accept-Language: en MIME-Version: 1.0 To: Tim Sullivan CC: Kernel Mailing List Subject: Re: test12-pre3: paging problem In-Reply-To: <3A250F85.EF1FD067@iex.net> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Tim Sullivan wrote: > > Hello, > > The following occurred during startup using test12-pre3. test12-pre2 > does not exhibit the problem. > > regards, > > -tim > > kernel: Unable to handle kernel paging request at virtual address > fffffffc > kernel: printing eip: > kernel: c011a41f > kernel: *pde = 00001063 > kernel: *pte = 00000000 > kernel: Oops: 0000 > kernel: CPU: 0 > kernel: EIP: 0010:[sys_setitimer+191/208] > kernel: EFLAGS: 00010246 > kernel: eax: 00000000 ebx: cf4e1fb0 ecx: 00000000 edx: c027169d > kernel: esi: bffffc68 edi: cf4e1fc0 ebp: 00000000 esp: cf4e1f88 > kernel: ds: 0018 es: 0018 ss: 0018 > kernel: Process ntpdate (pid: 451, stackpage=cf4e1000) > kernel: Stack: cf4e0000 bffffd1c 00000009 bffffc70 00000000 cf4e0000 > 400538e8 00000000 > kernel: 00000000 40166214 00000000 00030d40 00000000 000186a0 > c010a847 00000000 > kernel: bffffc58 00000000 bffffd1c 00000009 bffffc70 00000068 > 0000002b 0000002b > kernel: Call Trace: [system_call+51/56] > kernel: Code: c8 5d 83 c4 28 c3 90 90 90 90 90 90 90 90 90 90 90 83 ec > 44 Disassemblind the code bytes, it shows up as: 0: c8 5d 83 c4 enter $0x835d,$0xc4 4: 28 c3 subb %al,%bl 6: 90 nop which is definately wrong. Moving one byte forward it becomes: 0: 5d popl %ebp 1: 83 c4 28 addl $0x28,%esp 4: c3 ret 5: 90 nop which a normal sequence of instructions for the end of a function. It looks like a branch may have been miscompiled off by one. What compiler/binutils are you using? -- Brian Gerst - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/