From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753632AbWL0LJs (ORCPT ); Wed, 27 Dec 2006 06:09:48 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754453AbWL0LJr (ORCPT ); Wed, 27 Dec 2006 06:09:47 -0500 Received: from javad.com ([216.122.176.236]:4078 "EHLO javad.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753632AbWL0LJq (ORCPT ); Wed, 27 Dec 2006 06:09:46 -0500 From: Sergei Organov To: Jiri Slaby Cc: Andrew Morton , Subject: Re: moxa serial driver testing References: <45222E7E.3040904@gmail.com> <87wt7hw97c.fsf@javad.com> <4522ABC3.2000604@gmail.com> <878xjx6xtf.fsf@javad.com> <4522B5C2.3050004@gmail.com> <87mz8borl2.fsf@javad.com> <45251211.7010604@gmail.com> <87zmcaokys.fsf@javad.com> <45254F61.1080502@gmail.com> <87vemyo9ck.fsf@javad.com> <4af2d03a0610061355p5940a538pdcbd2cda249161e8@mail.gmail.com> <87vemtnbyg.fsf@javad.com> <452A1862.9030502@gmail.com> <87r6urket6.fsf@javad.com> <552766292581216610@wsc.cz> Date: Wed, 27 Dec 2006 14:09:21 +0300 In-Reply-To: <552766292581216610@wsc.cz> (Jiri Slaby's message of "Sat, 23 Dec 2006 02:35:46 +0100 (CET)") Message-ID: <87bqlpioim.fsf@javad.com> User-Agent: Gnus/5.110006 (No Gnus v0.6) XEmacs/21.4.19 (linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jiri Slaby writes: > osv@javad.com wrote: >> Hi Jiri, >> >> I've figured out that both old and new mxser drivers have two similar >> problems: >> >> 1. When there are data coming to a port, sometimes opening of the port >> entirely locks the box. This is quite reproducible. Any idea what's >> wrong and how can I help to debug it? > > Could you test the patch below, if something changes? I've tested the latest version you've sent me yesterday. Still no luck. The oops is below. I'll try with low_latency commented in a few minutes. BUG: unable to handle kernel NULL pointer dereference at virtual address 00000068 printing eip: f8f3711f *pde = 00000000 Oops: 0000 [#1] SMP Modules linked in: nvidia agpgart ipv6 nfs lockd nfs_acl sunrpc dm_mod sr_mod sbp2 ieee1394 ide_generic ide_disk e1000 snd_hda_intel snd_hda_codec snd_pcm_oss snd_mixer_oss i2c_i801 psmouse snd_pcm floppy tsdev serio_raw snd_timer parport_pc parport snd i2c_core pcspkr evdev soundcore snd_page_alloc mxser_new rtc ext3 jbd mbcache sd_mod ide_cd cdrom usb_storage usbhid ata_piix libata piix scsi_mod generic uhci_hcd ide_core usbcore skge thermal processor fan CPU: 0 EIP: 0060:[] Tainted: P VLI EFLAGS: 00010246 (2.6.18-3-686 #1) EIP is at mxser_stoprx+0x54/0x74 [mxser_new] eax: 00000000 ebx: 00000001 ecx: f8f3d79c edx: dfde7240 esi: f391211b edi: f4f83fff ebp: c1b17800 esp: f5bc7d7c ds: 007b es: 007b ss: 0068 Process make (pid: 17088, ti=f5bc6000 task=f4febaa0 task.ti=f5bc6000) Stack: 00000001 c01fe4af 000000ff f391201c c1b17c04 c011669e 00000000 00000000 00000003 00000096 c1b1780c 00000286 00000001 00000096 c01f97c9 00000000 f456f800 00000286 f8f38335 f5bc7e14 f8f3d8a8 00000286 c01f9806 f456f800 Call Trace: [] n_tty_receive_buf+0xcd6/0xcf9 [] __wake_up+0x2a/0x3d [] tty_ldisc_deref+0x50/0x5f [] mxser_receive_chars+0x241/0x249 [mxser_new] [] tty_ldisc_try+0x2e/0x32 [] flush_to_ldisc+0x12f/0x15c [] tty_ldisc_deref+0x1a/0x5f [] mxser_receive_chars+0x241/0x249 [mxser_new] [] mxser_transmit_chars+0x14/0x164 [mxser_new] [] flush_to_ldisc+0x104/0x15c [] mxser_receive_chars+0x241/0x249 [mxser_new] [] mxser_interrupt+0x15f/0x1e6 [mxser_new] [] handle_IRQ_event+0x23/0x49 [] __do_IRQ+0x93/0xe8 [] do_IRQ+0x43/0x52 [] common_interrupt+0x1a/0x20 [] __copy_from_user_ll+0x19/0x38 [] convert_fxsr_from_user+0x15/0xd5 [] pipe_read+0x0/0x1e [] restore_i387+0x6f/0xc0 [] restore_sigcontext+0x10f/0x165 [] sys_sigreturn+0xa4/0xcb [] syscall_call+0x7/0xb Code: 83 e0 ee 89 41 3c 25 ee 00 00 00 42 eb 19 0f b6 42 1a 8b 51 08 89 41 38 31 c0 42 ee 89 d8 83 c8 02 89 41 3c 0f b6 c0 ee 8b 41 04 <8b> 40 68 83 78 08 00 79 15 8b 41 40 8b 51 08 83 e0 fd 89 41 40 EIP: [] mxser_stoprx+0x54/0x74 [mxser_new] SS:ESP 0068:f5bc7d7c <0>Kernel panic - not syncing: Fatal exception in interrupt