Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751134AbWCKPJw (ORCPT ); Sat, 11 Mar 2006 10:09:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751140AbWCKPJw (ORCPT ); Sat, 11 Mar 2006 10:09:52 -0500 Received: from mail.deathmatch.net ([216.200.85.210]:60336 "EHLO mail.deathmatch.net") by vger.kernel.org with ESMTP id S1751134AbWCKPJv (ORCPT ); Sat, 11 Mar 2006 10:09:51 -0500 Date: Sat, 11 Mar 2006 10:09:08 -0500 From: Bob Copeland To: Paul Fulghum Cc: paulus@samba.org, Linux Kernel list Subject: Re: 2.6.16-rc5 pppd oops on disconnects Message-ID: <20060311150908.GA4872@hash.localnet> References: <1142011340.3220.4.camel@amdx2.microgate.com> <1142018709.26063.5.camel@amdx2.microgate.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1142018709.26063.5.camel@amdx2.microgate.com> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2984 Lines: 55 On Fri, Mar 10, 2006 at 01:25:09PM -0600, Paul Fulghum wrote: > The i_sem to i_mutex change started in the 2.6.16 series. > Running against 2.6.15 would be interesting. Being able > to repeat every time is a plus. I'm not that familiar > with the sysfs stuff, but the slab poisoning is pretty > damning. The dentry was released and then accessed. > > I looked at cdc_acm for disconnect and close and > did not see any problems (such as trying to call > tty_unregister_device twice for a device). Well, back to at least 2.6.15-rc7 I get a similar oops so this looks old and unrelated to the mutex changes. I don't believe it triggers without CONFIG_DEBUG_SLAB. Also won't oops without something (ppp) using the device at the time of disconnect. Unable to handle kernel paging request at virtual address 6b6b6bdb printing eip: c0176da6 *pde = 00000000 Oops: 0002 [#1] Modules linked in: ppp_deflate zlib_deflate bsd_comp ppp_async crc_ccitt ppp_generic slhc cdc_acm i915 binfmt_misc parport_pc lp parport video thermal processor fan button battery ac af_packet nls_iso8859_1 nls_cp437 vfat fat dm_mod fuse usb_storage ide_cd sr_mod scsi_mod cdrom i810 drm eth1394 pcmcia crc32 ipw2100 tg3 ieee80211 ieee80211_crypt joydev 8250_pci 8250 serial_core evdev snd_intel8x0 snd_intel8x0m yenta_socket rsrc_nonstatic pcmcia_core ohci1394 ieee1394 snd_ac97_codec snd_ac97_bus ehci_hcd uhci_hcd intel_agp agpgart usbcore unix CPU: 0 EIP: 0060:[] Not tainted VLI EFLAGS: 00210202 (2.6.15-rc7) EIP is at sysfs_hash_and_remove+0x2a/0x100 eax: 00200246 ebx: 6b6b6b6b ecx: 00000063 edx: cdea3c1c esi: cefe68d4 edi: cf608c60 ebp: cf608ccc esp: ce1fbe50 ds: 007b es: 007b ss: 0068 Process pppd (pid: 4128, threadinfo=ce1fa000 task=cef61540) Stack: c0288916 00000063 6b6b6b6b c64182d0 cefe68d4 cf608c60 cf608ccc c01e9f5f ced938a0 cefe68d4 cedb611c c02a0f11 c64182d0 00000000 c64182d0 ce970e40 00000000 00000000 c01e9fbf c64182d0 ccf14d68 d03e246e c64182d0 0a600000 Call Trace: [] class_device_del+0x94/0xe9 [] class_device_unregister+0xb/0x16 [] acm_tty_unregister+0x16/0x54 [cdc_acm] [] acm_tty_close+0x87/0x96 [cdc_acm] [] release_dev+0x1b1/0x5dc [] __group_send_sig_info+0x5d/0x69 [] sys_kill+0x4e/0x55 [] tty_release+0x9/0xd [] __fput+0x9f/0x12c [] filp_close+0x4e/0x57 [] sys_close+0x56/0x63 [] syscall_call+0x7/0xb Code: c3 55 57 56 53 51 8b 44 24 18 8b 40 50 89 04 24 8b 44 24 18 8b 58 08 85 db 0f 84 dc 00 00 00 6a 63 68 16 89 28 c0 e8 32 d0 f9 ff 4b 70 0f 88 cd 00 00 00 8b 44 24 08 8b 68 0c 58 5a 83 ed 04 -- Bob Copeland %% www.bobcopeland.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/