I still reported this bug 6 Weeks ago... and i checked it know with the current kernel 4.5.0-rc5. The bug is yet not fixed. A unplug of an USB 1.0 OHCI controller express card will result in a kernel crash. The express card is attached via thunderbolt and a sonnet express card to thunderbolt adapter. The computer hangs after the unplug, only a power down fix the situation. This is the kernel log of a kernel 4.4 via netconsole: pciehp 0000:06:03.0:pcie24: Card not present on Slot(3) pciehp 0000:06:03.0:pcie24: slot(3): Link Down event pciehp 0000:06:03.0:pcie24: Link Down event ignored on slot(3): already powering off ehci-pci 0000:0b:00.2: HC died; cleaning up ehci-pci 0000:0b:00.2: remove, state 4 usb usb5: USB disconnect, device number 1 pciehp 0000:00:1c.4:pcie04: Card not present on Slot(4) pciehp 0000:00:1c.4:pcie04: slot(4): Link Down event ehci-pci 0000:0b:00.2: USB bus 5 deregistered ohci-pci 0000:0b:00.1: HC died; cleaning up ohci-pci 0000:0b:00.1: remove, state 4 usb usb7: USB disconnect, device number 1 pciehp 0000:00:1c.4:pcie04: Link Down event ignored on slot(4): already powering off ohci-pci 0000:0b:00.1: USB bus 7 deregistered ohci-pci 0000:0b:00.0: HC died; cleaning up ohci-pci 0000:0b:00.0: remove, state 4 usb usb6: USB disconnect, device number 1 ------------[ cut here ]------------ kernel BUG at drivers/iommu/intel-iommu.c:3592! invalid opcode: 0000 [#1] PREEMPT SMP Modules linked in: ohci_pci ohci_hcd binfmt_misc netconsole configfs bbswitch(O) iwlmvm iwlwifi vboxnetadp(O) vboxnetflt(O) vboxdrv(O) nvidia(PO) vhost_net tun vhost kvm_intel kvm irqbypass dell_smm_hwmon [last unloaded: netconsole] CPU: 0 PID: 4857 Comm: kworker/0:3 Tainted: P O 4.4.0- gentoo #1 Hardware name: Dell Inc. XPS 2720/05R2TK , BIOS A12 09/21/2015 Workqueue: pciehp-3 pciehp_power_thread task: ffff8804070a2300 ti: ffff8803e4658000 task.ti: ffff8803e4658000 RIP: 0010:[<ffffffff8061edf4>] [<ffffffff8061edf4>] intel_unmap+0x1c4/0x1d0 RSP: 0018:ffff8803e465bb98 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8804225fb098 RCX: 00000000ffffc000 RDX: 0000000000000000 RSI: 00000000ffffc000 RDI: ffff8804225fb098 RBP: ffff8803e465bbd0 R08: 0000000000000000 R09: 0000000000000000 R10: ffff88046cc000c0 R11: 0000000000000000 R12: 00000000ffffffff R13: 00000000ffffc000 R14: ffff880468caa400 R15: ffffe8ffffc13800 FS: 0000000000000000(0000) GS:ffff88047f200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2515680324 CR3: 000000000120a000 CR4: 00000000001406f0 Stack: ffff8804101e4a78 ffff8803e465bbf0 ffffea000f915840 00000000ffffffff ffffffff812a3ec0 ffff880468caa400 ffffe8ffffc13800 ffff8803e465bbf0 ffffffff8061ee8a ffff88045e68f000 ffff8804225fb098 ffff8803e465bc28 Call Trace: [<ffffffff8061ee8a>] intel_free_coherent+0x5a/0xa0 [<ffffffffa0ad4d04>] ohci_stop+0x144/0x1c0 [ohci_hcd] [<ffffffff807e1fb4>] usb_remove_hcd+0xe4/0x1a0 [<ffffffff807f2203>] usb_hcd_pci_remove+0x63/0x130 [<ffffffff80573e79>] pci_device_remove+0x39/0xc0 [<ffffffff80714f46>] __device_release_driver+0x96/0x130 [<ffffffff80715003>] device_release_driver+0x23/0x30 [<ffffffff8056d84a>] pci_stop_bus_device+0x8a/0xa0 [<ffffffff8056d7f1>] pci_stop_bus_device+0x31/0xa0 [<ffffffff8056d7f1>] pci_stop_bus_device+0x31/0xa0 [<ffffffff8056d7f1>] pci_stop_bus_device+0x31/0xa0 [<ffffffff8056d962>] pci_stop_and_remove_bus_device+0x12/0x20 [<ffffffff80585f0b>] pciehp_unconfigure_device+0x9b/0x180 [<ffffffff80585a23>] pciehp_disable_slot+0x43/0xb0 [<ffffffff80585b1d>] pciehp_power_thread+0x8d/0xb0 [<ffffffff8028aa54>] process_one_work+0x144/0x3c0 [<ffffffff8028ad1b>] worker_thread+0x4b/0x440 [<ffffffff8028acd0>] ? process_one_work+0x3c0/0x3c0 [<ffffffff8028acd0>] ? process_one_work+0x3c0/0x3c0 [<ffffffff80290269>] kthread+0xc9/0xe0 [<ffffffff802901a0>] ? kthread_create_on_node+0x180/0x180 [<ffffffff80b4db2f>] ret_from_fork+0x3f/0x70 [<ffffffff802901a0>] ? kthread_create_on_node+0x180/0x180 Code: f9 48 89 de e8 fe cd ff ff 4c 89 e6 4c 89 f7 e8 23 92 ff ff 4c 89 ef e8 0b cf ff ff 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b e8 45 cf ff ff e9 f3 fe ff ff 0f 1f 44 00 00 55 48 8b 76 RIP [<ffffffff8061edf4>] intel_unmap+0x1c4/0x1d0 RSP <ffff8803e465bb98> ---[ end trace ad0596f59dc3d9e0 ]--- BUG: unable to handle kernel paging request at ffffffffffffffd8 IP: [<ffffffff80290881>] kthread_data+0x11/0x20 PGD 120b067 PUD 120d067 PMD 0 Oops: 0000 [#2] PREEMPT SMP Modules linked in: ohci_pci ohci_hcd binfmt_misc netconsole configfs bbswitch(O) iwlmvm iwlwifi vboxnetadp(O) vboxnetflt(O) vboxdrv(O) nvidia(PO) vhost_net tun vhost kvm_intel kvm irqbypass dell_smm_hwmon [last unloaded: netconsole] CPU: 0 PID: 4857 Comm: kworker/0:3 Tainted: P D O 4.4.0- gentoo #1 Hardware name: Dell Inc. XPS 2720/05R2TK , BIOS A12 09/21/2015 task: ffff8804070a2300 ti: ffff8803e4658000 task.ti: ffff8803e4658000 RIP: 0010:[<ffffffff80290881>] [<ffffffff80290881>] kthread_data+0x11/0x20 RSP: 0018:ffff8803e465b878 EFLAGS: 00010002 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814bd980 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8804070a2300 RBP: ffff8803e465b888 R08: 0000000000000000 R09: ffff880468dfe901 R10: 0000000000002800 R11: 000000000000001a R12: 0000000000000000 R13: 00000000000154c0 R14: ffff8804070a2300 R15: ffff88047f2154c0 FS: 0000000000000000(0000) GS:ffff88047f200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000028 CR3: 000000000120a000 CR4: 00000000001406f0 Stack: ffffffff8028b8c1 ffff88047f2154c0 ffff8803e465b8e8 ffffffff80b49c5a ffff8803e465b8a8 ffffffff00000000 ffff8804070a2300 ffffffff80275bb8 0000000000000000 ffff8803e465c000 ffff8803e465b930 ffff8803e465b498 Call Trace: [<ffffffff8028b8c1>] ? wq_worker_sleeping+0x11/0x90 [<ffffffff80b49c5a>] __schedule+0x60a/0xaa0 [<ffffffff80275bb8>] ? release_task+0x308/0x3e0 [<ffffffff80b4a12c>] schedule+0x3c/0x90 [<ffffffff80277242>] do_exit+0x702/0xa90 [<ffffffff80207989>] oops_end+0x89/0xc0 [<ffffffff80207beb>] die+0x4b/0x70 [<ffffffff80204e94>] do_trap+0xb4/0x150 [<ffffffff80204fa7>] do_error_trap+0x77/0xe0 [<ffffffff8061edf4>] ? intel_unmap+0x1c4/0x1d0 [<ffffffff80619eb6>] ? qi_submit_sync+0x2d6/0x3e0 [<ffffffff80205700>] do_invalid_op+0x20/0x30 [<ffffffff80b4f188>] invalid_op+0x18/0x20 [<ffffffff8061edf4>] ? intel_unmap+0x1c4/0x1d0 [<ffffffff8061ec51>] ? intel_unmap+0x21/0x1d0 [<ffffffff8061ee8a>] intel_free_coherent+0x5a/0xa0 [<ffffffffa0ad4d04>] ohci_stop+0x144/0x1c0 [ohci_hcd] [<ffffffff807e1fb4>] usb_remove_hcd+0xe4/0x1a0 [<ffffffff807f2203>] usb_hcd_pci_remove+0x63/0x130 [<ffffffff80573e79>] pci_device_remove+0x39/0xc0 [<ffffffff80714f46>] __device_release_driver+0x96/0x130 [<ffffffff80715003>] device_release_driver+0x23/0x30 [<ffffffff8056d84a>] pci_stop_bus_device+0x8a/0xa0 [<ffffffff8056d7f1>] pci_stop_bus_device+0x31/0xa0 [<ffffffff8056d7f1>] pci_stop_bus_device+0x31/0xa0 [<ffffffff8056d7f1>] pci_stop_bus_device+0x31/0xa0 [<ffffffff8056d962>] pci_stop_and_remove_bus_device+0x12/0x20 [<ffffffff80585f0b>] pciehp_unconfigure_device+0x9b/0x180 [<ffffffff80585a23>] pciehp_disable_slot+0x43/0xb0 [<ffffffff80585b1d>] pciehp_power_thread+0x8d/0xb0 [<ffffffff8028aa54>] process_one_work+0x144/0x3c0 [<ffffffff8028ad1b>] worker_thread+0x4b/0x440 [<ffffffff8028acd0>] ? process_one_work+0x3c0/0x3c0 [<ffffffff8028acd0>] ? process_one_work+0x3c0/0x3c0 [<ffffffff80290269>] kthread+0xc9/0xe0 [<ffffffff802901a0>] ? kthread_create_on_node+0x180/0x180 [<ffffffff80b4db2f>] ret_from_fork+0x3f/0x70 [<ffffffff802901a0>] ? kthread_create_on_node+0x180/0x180 Code: 02 00 00 00 e8 a1 fd ff ff 5d c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
