From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932700AbWL0LtR (ORCPT ); Wed, 27 Dec 2006 06:49:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932707AbWL0LtR (ORCPT ); Wed, 27 Dec 2006 06:49:17 -0500 Received: from javad.com ([216.122.176.236]:4688 "EHLO javad.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932700AbWL0LtQ (ORCPT ); Wed, 27 Dec 2006 06:49:16 -0500 From: Sergei Organov To: Jiri Slaby Cc: Andrew Morton , Subject: Re: moxa serial driver testing In-Reply-To: <552766292581216610@wsc.cz> (Jiri Slaby's message of "Sat, 23 Dec 2006 02:35:46 +0100 (CET)") Date: Wed, 27 Dec 2006 14:48:13 +0300 Message-ID: <87mz595zlu.fsf@javad.com> 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> 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? Just tested with low_latency commented out. Still oopses: BUG: unable to handle kernel NULL pointer dereference at virtual address 00000008 printing eip: f8f1730f *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 snd_pcm snd_timer i2c_i801 tsdev psmouse snd soundcore snd_page_alloc i2c_core serio_raw parport_pc parport mxser_new evdev floppy pcspkr rtc ext3 jbd mbcache usb_storage usbhid ide_cd cdrom sd_mod uhci_hcd piix usbcore skge ata_piix libata scsi_mod generic ide_core thermal processor fan CPU: 0 EIP: 0060:[] Tainted: P VLI EFLAGS: 00010046 (2.6.18-3-686 #1) EIP is at mxser_receive_chars+0x21b/0x249 [mxser_new] eax: 00000000 ebx: 00000000 ecx: 00000000 edx: 00000286 esi: f8f1c79c edi: 00000001 ebp: c1be6000 esp: c0313efc ds: 007b es: 007b ss: 0068 Process swapper (pid: 0, ti=c0312000 task=c02c76a0 task.ti=c0312000) Stack: c0313f48 f8f1c8a8 0000903d 00000000 00000fff 000000ff 00000286 0000007b f8f1c79c 00000006 0000007f 000000c6 f8f17d7a 00000007 00000008 00000080 00000000 00000000 f8f1bdc0 00000060 df985500 00000000 00000000 0000003a Call Trace: [] mxser_interrupt+0x15f/0x1e6 [mxser_new] [] handle_IRQ_event+0x23/0x49 [] __do_IRQ+0x93/0xe8 [] do_IRQ+0x43/0x52 [] common_interrupt+0x1a/0x20 [] mwait_idle+0x25/0x38 [] cpu_idle+0x9f/0xb9 [] start_kernel+0x379/0x380 Code: ed ff ff eb 1f 8b 06 83 78 18 00 75 17 8b 56 08 83 c2 05 ec 8b 14 24 0f b6 c0 a8 01 89 02 0f 85 d4 fe ff ff 8b 46 04 8b 54 24 18 <8b> 40 08 01 3c 85 c4 ec f1 f8 8b 44 24 04 01 be f4 00 00 00 01 EIP: [] mxser_receive_chars+0x21b/0x249 [mxser_new] SS:ESP 0068:c0313efc <0>Kernel panic - not syncing: Fatal exception in interrupt BUG: warning at arch/i386/kernel/smp.c:547/smp_call_function() [] smp_call_function+0x53/0xfe [] printk+0x14/0x18 [] smp_send_stop+0x13/0x1c [] panic+0x4c/0xe2 [] die+0x256/0x28a [] do_page_fault+0x3b4/0x481 [] tty_buffer_request_room+0x107/0x112 [] do_page_fault+0x0/0x481 [] error_code+0x39/0x40 [] mxser_receive_chars+0x21b/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 [] mwait_idle+0x25/0x38 [] cpu_idle+0x9f/0xb9 [] start_kernel+0x379/0x380