I rather suddenly got a NULL pointer dereference yesterday, running 3.10.9. Curiously, the same re-occurred on my next boot (shutdown, cold poweron), around when udev was loading modules. After this, I shutdown again, and turned the PSU switch off for a few seconds - at the next boot, the problem stopped. [613257.292304] BUG: unable to handle kernel NULL pointer dereference at (null) [613257.292337] IP: [<ffffffffa030035e>] hub_quiesce+0x4e/0xb0 [usbcore] [613257.292363] PGD 411313067 PUD 411380067 PMD 0 [613257.292386] Oops: 0000 [#1] PREEMPT SMP [613257.292405] Modules linked in: usb_storage fuse netconsole configfs cfq_iosched bridge stp llc ipv6 cdc_acm ftdi_sio cp210x usbserial hid_generic usbhid hid evdev coretemp hwmon mperf 8250_pci intel_powerclamp 8250 serial_core xhci_hcd ehci_pci ehci_hcd i915 video drm_kms_helper drm i2c_algo_bit ata_generic usbcore i2c_i801 kvm_intel kvm psmouse firewire_ohci firewire_core usb_common tpm_tis crc_itu_t tpm tpm_bios pata_acpi snd_hda_codec_hdmi snd_hda_codec_realtek e1000e 8139too rtc_cmos mii ptp pps_core snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_page_alloc snd_timer snd button [613257.292748] CPU: 0 PID: 1284 Comm: khubd Tainted: G W 3.10.9- gentoo #1 [613257.292767] Hardware name: /DQ67SW, BIOS SWQ6710H.86A.0062.2012.0418.1112 04/18/2012 [613257.292792] task: ffff880429abf060 ti: ffff880426024000 task.ti: ffff880426024000 [613257.292813] RIP: 0010:[<ffffffffa030035e>] [<ffffffffa030035e>] hub_quiesce+0x4e/0xb0 [usbcore] [613257.292843] RSP: 0000:ffff880426025828 EFLAGS: 00010246 [613257.292859] RAX: ffff8800b86273c0 RBX: ffff8803fb069400 RCX: 0000000000000006 [613257.292878] RDX: 0000000000000000 RSI: 000000007fffffff RDI: 0000000000000000 [613257.292898] RBP: ffff880426025848 R08: 0000000000000000 R09: 0000000000000000 [613257.292917] R10: 00000000000006a6 R11: 0000000000000000 R12: ffff8804020cc000 [613257.292936] R13: 0000000000000000 R14: ffff8803b6736430 R15: 0000000000000096 [613257.292956] FS: 0000000000000000(0000) GS:ffff88043e200000(0000) knlGS:0000000000000000 [613257.292977] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [613257.292993] CR2: 0000000000000000 CR3: 0000000409a08000 CR4: 00000000000407f0 [613257.293012] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [613257.293032] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [613257.293051] Stack: [613257.293057] ffff880426025848 ffff8803fb069400 ffff8804020cc088 ffff8803b6736400 [613257.293089] ffff880426025878 ffffffffa0300679 ffff8803fb069400 ffff8803b6736400 [613257.293121] ffff8804020cc000 ffff880428dc2000 ffff880426025918 ffffffffa0302fa1 [613257.293152] Call Trace: [613257.293164] [<ffffffffa0300679>] hub_disconnect+0x79/0x140 [usbcore] [613257.293184] [<ffffffffa0302fa1>] hub_probe+0x301/0x820 [usbcore] [613257.293204] [<ffffffffa030b361>] usb_probe_interface+0x1a1/0x290 [usbcore] [613257.293226] [<ffffffff81300756>] driver_probe_device+0x76/0x240 [613257.293243] [<ffffffff81300a0b>] __device_attach+0x4b/0x60 [613257.293259] [<ffffffff813009c0>] ? __driver_attach+0xa0/0xa0 [613257.293276] [<ffffffff812feb64>] bus_for_each_drv+0x54/0x90 [613257.293292] [<ffffffff813006a8>] device_attach+0x98/0xb0 [613257.293308] [<ffffffff812ffba8>] bus_probe_device+0x98/0xc0 [613257.293324] [<ffffffff812fdfa4>] device_add+0x5b4/0x670 [613257.293341] [<ffffffffa02fe09b>] ? usb_set_device_state+0xab/0x180 [usbcore] [613257.293363] [<ffffffffa0309655>] usb_set_configuration+0x5f5/0x810 [usbcore] [613257.293385] [<ffffffffa0313132>] generic_probe+0x32/0x90 [usbcore] [613257.293405] [<ffffffffa030b47d>] usb_probe_device+0x2d/0x60 [usbcore] [613257.293423] [<ffffffff81300756>] driver_probe_device+0x76/0x240 [613257.293439] [<ffffffff81300a0b>] __device_attach+0x4b/0x60 [613257.293455] [<ffffffff813009c0>] ? __driver_attach+0xa0/0xa0 [613257.293471] [<ffffffff812feb64>] bus_for_each_drv+0x54/0x90 [613257.293487] [<ffffffff813006a8>] device_attach+0x98/0xb0 [613257.293503] [<ffffffff812ffba8>] bus_probe_device+0x98/0xc0 [613257.293518] [<ffffffff812fdfa4>] device_add+0x5b4/0x670 [613257.293535] [<ffffffffa0300917>] usb_new_device+0x1d7/0x370 [usbcore] [613257.293555] [<ffffffffa0301cac>] hub_thread+0x69c/0x1420 [usbcore] [613257.293573] [<ffffffff81059f10>] ? abort_exclusive_wait+0xb0/0xb0 [613257.293592] [<ffffffffa0301610>] ? hub_port_debounce+0xe0/0xe0 [usbcore] [613257.293611] [<ffffffff8105959b>] kthread+0xbb/0xc0 [613257.293625] [<ffffffff81430000>] ? generic_processor_info+0x75/0x18a [613257.293643] [<ffffffff810594e0>] ? kthread_freezable_should_stop+0x70/0x70 [613257.293662] [<ffffffff8143c2ec>] ret_from_fork+0x7c/0xb0 [613257.293677] [<ffffffff810594e0>] ? kthread_freezable_should_stop+0x70/0x70 [613257.293697] Code: 80 8b f0 00 00 00 02 41 83 fd 02 74 37 45 8b ac 24 78 04 00 00 45 85 ed 7e 2a 45 31 ed 48 8b 83 10 02 00 00 49 63 d5 48 8b 3c d0 <48> 83 3f 00 74 05 e8 07 fe ff ff 41 83 c5 01 45 39 ac 24 78 04 [613257.293956] RIP [<ffffffffa030035e>] hub_quiesce+0x4e/0xb0 [usbcore] [613257.293979] RSP <ffff880426025828> [613257.293988] CR2: 0000000000000000 [613257.301183] ---[ end trace 3347bc36b4bf0c05 ]--- [613258.409850] usb 4-1.5: reset full-speed USB device number 5 using ehci-pci -- 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
