From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933166AbYETOyp (ORCPT ); Tue, 20 May 2008 10:54:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932325AbYETOyR (ORCPT ); Tue, 20 May 2008 10:54:17 -0400 Received: from smtp.innovsys.com ([66.115.232.196]:40400 "EHLO mail.innovsys.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756892AbYETOyP convert rfc822-to-8bit (ORCPT ); Tue, 20 May 2008 10:54:15 -0400 X-Greylist: delayed 851 seconds by postgrey-1.27 at vger.kernel.org; Tue, 20 May 2008 10:54:15 EDT X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT Subject: RE: Oops in fs_enet driver with preempt-rt Date: Tue, 20 May 2008 09:53:14 -0500 Message-ID: In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Oops in fs_enet driver with preempt-rt Thread-Index: Aci6h3OGhRkBaFRJS1aUcSwgWuuDOQAAZonw References: From: "Rune Torgersen" To: , , Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Rune Torgersen wrote: > Hi > I am trying to get preempt-rt (v2.6.25.4-rt1) to work on a Freescale > 8280 CPU (arch/powerpc) > > I get the follwing oops when trying to enable ethernet: > (looks like a null pointer dereference in > drivers/net/fs_enet/fs_enet-main.c:106) And if I disable NAPI I get this one instead: Bringing up the eth1 interface...Unable to handle kernel paging request for data at address 0x00000000 Faulting instruction address: 0xc019706c Oops: Kernel access of bad area, sig: 11 [#1] PREEMPT Innovative Systems ApMax Modules linked in: NIP: c019706c LR: c0196d84 CTR: c0198790 REGS: ef2c3cb0 TRAP: 0300 Not tainted (2.6.25.4-rt1) MSR: 00009032 CR: 42004222 XER: 00000000 DAR: 00000000, DSISR: 20000000 TASK = ef2ac590[114] 'ifconfig' THREAD: ef2c2000 GPR00: 00000000 ef2c3d60 ef2ac590 ef37f000 00000008 00000000 ef2c3d5c 0000008c GPR08: ef2c3d38 00000008 ef2c3d40 00000001 22000222 10021454 00000000 100a37b0 GPR16: 10090000 ef3e71e0 ef3e71e0 00000000 10070000 00000008 100192c0 00008914 GPR24: ef37f000 ef37f5a0 00000000 c0196d34 00000000 ef37f5a0 fffffff4 ef2973a0 NIP [c019706c] fs_enet_interrupt+0x338/0x5f4 LR [c0196d84] fs_enet_interrupt+0x50/0x5f4 Call Trace: [ef2c3d60] [c024a270] __spin_unlock_irqrestore+0x20/0x4c (unreliable) [ef2c3db0] [c0049a04] request_irq+0xb8/0xfc [ef2c3de0] [c0198044] fs_enet_open+0x8c/0x210 [ef2c3e00] [c01d9b4c] dev_open+0x80/0xe8 [ef2c3e10] [c01d89ac] dev_change_flags+0xc8/0x19c [ef2c3e30] [c021bfb0] devinet_ioctl+0x284/0x6f0 [ef2c3e90] [c021c8fc] inet_ioctl+0xc0/0xf4 [ef2c3ea0] [c01cbec4] sock_ioctl+0x200/0x23c [ef2c3ec0] [c00810c0] vfs_ioctl+0x44/0xa8 [ef2c3ee0] [c0081520] do_vfs_ioctl+0x3fc/0x440 [ef2c3f10] [c00815a4] sys_ioctl+0x40/0x70 [ef2c3f40] [c000fcf0] ret_from_syscall+0x0/0x38 --- Exception: c01 at 0xff6a37c LR = 0xffecd58 Instruction dump: 7c0004ac b01c0000 72e02000 3b9c0008 41820008 839d00bc 813d00a0 7f03c378 81290034 7d2903a6 4e800421 7c0004ac 0c000000 4c00012c 5417043e ---[ end trace 61ff5e5c97ddf707 ]--- Seems to be caused by line 471 in fs_enet_main: 0xc0196d84 is in fs_enet_interrupt (drivers/net/fs_enet/fs_enet-main.c:473). 468 if (fpi->use_napi) 469 int_clr_events &= ~fep->ev_napi_rx; 470 471 (*fep->ops->clear_int_events)(dev, int_clr_events); 472 473 if (int_events & fep->ev_err) 474 (*fep->ops->ev_error)(dev, int_events); 475 476 if (int_events & fep->ev_rx) { 477 if (!fpi->use_napi) (gdb)