Greg: You may already be aware of this, and it may already be fixed. But in case you aren't and it isn't, read on...
As of gregkh-all-2.6.21-rc5 there's a bug in the device-class code. It shows up when you rmmod all the USB host controller drivers. Here's what happened to me: [ 78.686853] ehci_hcd 0000:00:1d.7: remove, state 4 [ 78.686916] ehci_hcd 0000:00:1d.7: roothub graceful disconnect [ 78.686992] usb usb1: USB disconnect, address 1 [ 78.687053] usb usb1: unregistering device [ 78.687238] usb usb1: usb_disable_device nuking all URBs [ 78.687311] usb usb1: unregistering interface 1-0:1.0 [ 78.688011] usb_endpoint usbdev1.1_ep81: ep_device_release called for usbdev1.1_ep81 [ 78.688871] usb 1-0:1.0: uevent [ 78.689041] usb 1-0:1.0: uevent [ 78.690020] usb_endpoint usbdev1.1_ep00: ep_device_release called for usbdev1.1_ep00 [ 78.690878] BUG: unable to handle kernel paging request at virtual address 6b6b6b6b [ 78.690982] printing eip: [ 78.691030] c0193b05 [ 78.691076] *pde = 00000000 [ 78.691127] Oops: 0000 [#1] [ 78.691175] PREEMPT SMP [ 78.691291] last sysfs file: /devices/pnp0/00:00/id [ 78.691344] Modules linked in: thermal processor fan container button battery ac evdev pcspkr e100 ehci_hcd mii usbcore [ 78.691901] CPU: 0 [ 78.691902] EIP: 0060:[<c0193b05>] Not tainted VLI [ 78.691904] EFLAGS: 00010202 (2.6.21-rc5 #1) [ 78.692057] EIP is at __sysfs_remove_dir+0x13/0xff [ 78.692109] eax: 6b6b6b6b ebx: cecf34e8 ecx: 00000003 edx: 00000001 [ 78.692164] esi: 00000000 edi: 6b6b6b6b ebp: cd10dd94 esp: cd10dd7c [ 78.692219] ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068 [ 78.692274] Process rmmod (pid: 4414, ti=cd10c000 task=c13dca90 task.ti=cd10c000) [ 78.692328] Stack: c01cd8b8 cecf32e4 00000000 cecf34e8 00000000 cf4610f8 cd10dda0 c0193c09 [ 78.692705] cecf34e8 cd10ddac c01cd926 cecf34e8 cd10ddbc c021e03d cef939dc d08418cb [ 78.693081] cd10ddc4 c021e710 cd10ddcc d08418db cd10ddec c01ce4e4 cecf36b8 cd10dde0 [ 78.693458] Call Trace: [ 78.693547] [<c0105016>] show_trace_log_lvl+0x1a/0x2f [ 78.693638] [<c01050c8>] show_stack_log_lvl+0x9d/0xa5 [ 78.693725] [<c01052bd>] show_registers+0x1ed/0x32c [ 78.693814] [<c0105519>] die+0x11d/0x21e [ 78.693899] [<c0119cc6>] do_page_fault+0x443/0x515 [ 78.693988] [<c02a0014>] error_code+0x7c/0x84 [ 78.694078] [<c0193c09>] sysfs_remove_dir+0xe/0x18 [ 78.694166] [<c01cd926>] kobject_del+0xf/0x19 [ 78.694255] [<c021e03d>] class_unregister+0x5c/0x67 [ 78.694345] [<c021e710>] class_destroy+0x13/0x15 [ 78.694432] [<d08418db>] release_endpoint_class+0x10/0x38 [usbcore] [ 78.694547] [<c01ce4e4>] kref_put+0x79/0x89 [ 78.694634] [<d084185e>] destroy_endpoint_class+0x16/0x18 [usbcore] [ 78.694739] [<d08418c3>] usb_remove_ep_files+0x63/0x6b [usbcore] [ 78.694842] [<d084128e>] usb_remove_sysfs_dev_files+0x12/0x6e [usbcore] [ 78.694947] [<d08447d5>] generic_disconnect+0x25/0x28 [usbcore] [ 78.695052] [<d083e48b>] usb_unbind_device+0xf/0x13 [usbcore] [ 78.695154] [<c021cfd2>] __device_release_driver+0x74/0x90 [ 78.695244] [<c021d3a4>] device_release_driver+0x30/0x47 [ 78.695332] [<c021c926>] bus_remove_device+0x73/0x82 [ 78.695420] [<c021af4c>] device_del+0x23b/0x2b2 [ 78.695508] [<d0838946>] usb_disconnect+0xe9/0x15c [usbcore] [ 78.695609] [<d083ab20>] usb_remove_hcd+0xa5/0xfa [usbcore] [ 78.695710] [<d0844c3f>] usb_hcd_pci_remove+0x18/0x6a [usbcore] [ 78.695815] [<c01d7cd4>] pci_device_remove+0x19/0x39 [ 78.695907] [<c021cfd2>] __device_release_driver+0x74/0x90 [ 78.695995] [<c021d460>] driver_detach+0xa5/0xe3 [ 78.696082] [<c021cb10>] bus_remove_driver+0x5d/0x79 [ 78.696170] [<c021d59e>] driver_unregister+0xb/0x18 [ 78.696258] [<c01d7e3b>] pci_unregister_driver+0x10/0x5f [ 78.696346] [<d0828e2d>] ehci_hcd_cleanup+0xd/0xf [ehci_hcd] [ 78.696440] [<c0141e03>] sys_delete_module+0x185/0x1ae [ 78.696530] [<c0103fe4>] sysenter_past_esp+0x5d/0x99 [ 78.697531] ======================= [ 78.697580] Code: 05 8c 00 00 00 e8 85 a8 10 00 89 f8 e8 7a ea fd ff 58 5a 5b 5e 5f 5d c3 55 89 e5 57 56 53 83 ec 0c 89 c7 85 c0 0f 84 e4 00 00 00 <83> 38 00 75 04 0f 0b eb fe 90 ff 00 8b 40 28 05 8c 00 00 00 e8 [ 78.699920] EIP: [<c0193b05>] __sysfs_remove_dir+0x13/0xff SS:ESP 0068:cd10dd7c Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
