this patch fixes it: https://git.kernel.org/cgit/linux/kernel/git/stable/linux- stable.git/commit/drivers/staging/comedi?id=52ef9e7cb317fcb7f8b63f1bec7271e40341ce98
however as I said before I would recommend applying all patches up to the current stable kernel because we did quite a lot of cleanup work. I'm happy to test any patched kernels. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1281298 Title: kernel oops when unplugging usbdux Status in “linux” package in Ubuntu: Triaged Bug description: This is a bug which has been fixed upstream: https://git.kernel.org/cgit/linux/kernel/git/stable/linux- stable.git/commit/drivers/staging/comedi?id=52ef9e7cb317fcb7f8b63f1bec7271e40341ce98 [ 594.994904] Call Trace: [ 594.994920] [<ffffffff81709bd5>] dump_stack+0x45/0x56 [ 594.994931] [<ffffffff8106450d>] warn_slowpath_common+0x7d/0xa0 [ 594.994938] [<ffffffff8106457c>] warn_slowpath_fmt+0x4c/0x50 [ 594.994946] [<ffffffff8122eade>] ? sysfs_get_dirent_ns+0x4e/0x70 [ 594.994953] [<ffffffff8122fdb6>] sysfs_remove_group+0xc6/0xd0 [ 594.994961] [<ffffffff81489d33>] dpm_sysfs_remove+0x43/0x50 [ 594.994970] [<ffffffff8147f765>] device_del+0x45/0x1c0 [ 594.994976] [<ffffffff8147f8fe>] device_unregister+0x1e/0x60 [ 594.994982] [<ffffffff8147f9bc>] device_destroy+0x3c/0x50 [ 594.994999] [<ffffffffa042e525>] comedi_free_subdevice_minor+0x75/0xa0 [comedi] [ 594.995011] [<ffffffffa042ef68>] comedi_device_detach+0x48/0x160 [comedi] [ 594.995020] [<ffffffffa042b2b3>] comedi_device_cleanup+0x33/0x90 [comedi] [ 594.995029] [<ffffffffa042b346>] comedi_free_board_dev+0x36/0x50 [comedi] [ 594.995038] [<ffffffffa042e3b0>] comedi_release_hardware_device+0x80/0x90 [comedi] [ 594.995048] [<ffffffffa042ea63>] comedi_auto_unconfig+0x13/0x20 [comedi] [ 594.995059] [<ffffffffa0430112>] comedi_usb_auto_unconfig+0x12/0x20 [comedi] [ 594.995067] [<ffffffff81536bb4>] usb_unbind_interface+0x64/0x1c0 [ 594.995075] [<ffffffff8148347f>] __device_release_driver+0x7f/0xf0 [ 594.995081] [<ffffffff81483513>] device_release_driver+0x23/0x30 [ 594.995087] [<ffffffff81482d98>] bus_remove_device+0x108/0x180 [ 594.995093] [<ffffffff8147f849>] device_del+0x129/0x1c0 [ 594.995100] [<ffffffff81534590>] usb_disable_device+0xb0/0x290 [ 594.995108] [<ffffffff8152914d>] usb_disconnect+0xad/0x200 [ 594.995115] [<ffffffff8152bb95>] hub_port_connect_change+0xd5/0xb50 [ 594.995121] [<ffffffff81532f94>] ? usb_control_msg+0xd4/0x110 [ 594.995128] [<ffffffff8152cad4>] hub_events+0x4c4/0xa20 [ 594.995135] [<ffffffff8152d065>] hub_thread+0x35/0x160 [ 594.995144] [<ffffffff810a8940>] ? prepare_to_wait_event+0x100/0x100 [ 594.995151] [<ffffffff8152d030>] ? hub_events+0xa20/0xa20 [ 594.995159] [<ffffffff810880f2>] kthread+0xd2/0xf0 [ 594.995165] [<ffffffff81088020>] ? kthread_create_on_node+0x190/0x190 [ 594.995174] [<ffffffff8171a4fc>] ret_from_fork+0x7c/0xb0 [ 594.995181] [<ffffffff81088020>] ? kthread_create_on_node+0x190/0x190 [ 594.995186] ---[ end trace 45b9c5978e289ccb ]--- It would be probably very benefical to commit all bug fixes from the latest linux stable for the comedi branch. In order to get this moved to the normal driver tree loads of tidying up has happend last year which inevitably has lead to new bugs which we sorted in Jan and are now in the latest stable kernel. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-8-generic 3.13.0-8.28 ProcVersionSignature: Ubuntu 3.13.0-8.28-generic 3.13.2 Uname: Linux 3.13.0-8-generic x86_64 ApportVersion: 2.13.2-0ubuntu4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: bp1 1405 F.... pulseaudio /dev/snd/controlC0: bp1 1405 F.... pulseaudio Date: Mon Feb 17 21:03:38 2014 HibernationDevice: RESUME=UUID=b6911a72-ca8c-451f-980b-5f16df4e94f3 InstallationDate: Installed on 2013-12-09 (69 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20131209) IwConfig: eth0 no wireless extensions. lo no wireless extensions. MachineType: Dell Inc. Dimension 9100 ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-8-generic root=UUID=781db715-a195-4dda-b877-9f7c87a81821 ro RelatedPackageVersions: linux-restricted-modules-3.13.0-8-generic N/A linux-backports-modules-3.13.0-8-generic N/A linux-firmware 1.124 RfKill: SourcePackage: linux StagingDrivers: usbduxsigma comedi comedi_fc UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/25/2005 dmi.bios.vendor: Dell Inc. dmi.bios.version: A01 dmi.board.name: 0X8582 dmi.board.vendor: Dell Inc. dmi.chassis.type: 7 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA01:bd05/25/2005:svnDellInc.:pnDimension9100:pvr:rvnDellInc.:rn0X8582:rvr:cvnDellInc.:ct7:cvr: dmi.product.name: Dimension 9100 dmi.sys.vendor: Dell Inc. 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