Extract from dmesg: [32499.845341] usb 1-1.6: USB disconnect, device number 6 [32509.001659] usb 1-1.6: new full-speed USB device number 7 using ehci-pci [32509.096558] usb 1-1.6: New USB device found, idVendor=0525, idProduct=a4a2 [32509.096561] usb 1-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [32509.096562] usb 1-1.6: Product: RNDIS/Ethernet Gadget [32509.096563] usb 1-1.6: Manufacturer: Linux 2.6.32-ubi-stab033.19995-pxa with pxa27x_ud [32509.276738] BUG: unable to handle kernel NULL pointer dereference at 0000000000000003 [32509.276761] IP: [] usbnet_generic_cdc_bind+0x171/0x710 [cdc_ether] [32509.276780] PGD 0 [32509.276786] Oops: 0000 [#1] SMP [32509.276795] Modules linked in: cdc_ether(+) usbnet mii cfg80211 nfsv3 nfs_acl rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) binfmt_misc nls_iso8859_1 uas usb_storage intel_rapl x86_pkg_temp_thermal intel_powerclamp input_leds coretemp snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic dcdbas kvm_intel kvm snd_hda_intel snd_hda_codec irqbypass snd_hda_core snd_hwdep crct10dif_pclmul crc32_pclmul snd_pcm aesni_intel snd_seq_midi snd_seq_midi_event aes_x86_64 lrw snd_rawmidi gf128mul glue_helper ablk_helper snd_seq cryptd serio_raw snd_seq_device snd_timer snd mei_me mei soundcore shpchp lpc_ich 8250_fintek mac_hid sunrpc parport_pc ppdev lp parport autofs4 hid_generic usbhid hid i915 i2c_algo_bit drm_kms_helper syscopyarea [32509.276995] sysfillrect sysimgblt e1000e psmouse fb_sys_fops ahci drm libahci ptp pps_core fjes video [32509.277028] CPU: 1 PID: 19768 Comm: systemd-udevd Tainted: G OE 4.4.0-21-generic #37-Ubuntu [32509.277064] Hardware name: Dell Inc. OptiPlex 7020/08WKV3, BIOS A01 08/23/2014 [32509.277092] task: ffff8804097dee00 ti: ffff88000f410000 task.ti: ffff88000f410000 [32509.277109] RIP: 0010:[] [] usbnet_generic_cdc_bind+0x171/0x710 [cdc_ether] [32509.277132] RSP: 0018:ffff88000f4139b8 EFLAGS: 00010292 [32509.277144] RAX: 0000000000000000 RBX: ffff880341de6840 RCX: ffff8800c4cdc692 [32509.277159] RDX: ffff8800c4cdc692 RSI: ffff8800d3fb1400 RDI: ffff8803e9ce5800 [32509.277173] RBP: ffff88000f413a78 R08: ffff8800c4cdc672 R09: ffff88040e003900 [32509.277188] R10: ffff8803dba1f780 R11: 0000000000003b99 R12: ffff8800d3fb1400 [32509.277202] R13: 0000000000000000 R14: ffffffffc06b4068 R15: ffff880341de6938 [32509.277217] FS: 00007f96ef0778c0(0000) GS:ffff88041ea40000(0000) knlGS:0000000000000000 [32509.277234] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [32509.277246] CR2: 0000000000000003 CR3: 0000000098e76000 CR4: 00000000001406e0 [32509.277261] Stack: [32509.277265] ffff880341de62a0 ffff88000f413a08 ffffffff8172272e 0000000000000000 [32509.277283] ffff8800c4cdc672 0000000000000000 0000000000000000 0000000000000000 [32509.277301] 0000000000000000 ffff8800c4cdc692 0000000000000000 ffff8800c4cdc677 [32509.277319] Call Trace: [32509.277329] [] ? __hw_addr_add_ex+0x7e/0xe0 [32509.277342] [] usbnet_cdc_bind+0x19/0x80 [cdc_ether] [32509.277357] [] usbnet_probe+0x320/0x8c0 [usbnet] [32509.277373] [] usb_probe_interface+0x1bd/0x300 [32509.277386] [] driver_probe_device+0x222/0x4a0 [32509.277399] [] __driver_attach+0x84/0x90 [32509.277412] [] ? driver_probe_device+0x4a0/0x4a0 [32509.277427] [] bus_for_each_dev+0x6c/0xc0 [32509.277440] [] driver_attach+0x1e/0x20 [32509.277452] [] bus_add_driver+0x1eb/0x280 [32509.277465] [] driver_register+0x60/0xe0 [32509.277478] [] usb_register_driver+0x84/0x140 [32509.277491] [] ? 0xffffffffc06b7000 [32509.277503] [] cdc_driver_init+0x1e/0x1000 [cdc_ether] [32509.277519] [] do_one_initcall+0xb3/0x200 [32509.277533] [] ? kmem_cache_alloc_trace+0x183/0x1f0 [32509.277548] [] do_init_module+0x5f/0x1cf [32509.277561] [] load_module+0x1667/0x1c00 [32509.277573] [] ? __symbol_put+0x60/0x60 [32509.277594] [] ? kernel_read+0x50/0x80 [32509.277606] [] SYSC_finit_module+0xb4/0xe0 [32509.277618] [] SyS_finit_module+0xe/0x10 [32509.277630] [] entry_SYSCALL_64_fastpath+0x16/0x71 [32509.277643] Code: ff 48 8b 95 60 ff ff ff 48 8b 85 58 ff ff ff 48 8b 3b 48 89 93 f8 00 00 00 48 8b 55 88 48 89 83 00 01 00 00 48 89 93 08 01 00 00 <0f> b6 70 03 e8 76 0c f5 c0 48 89 83 10 01 00 00 48 8b 83 00 01 [32509.277719] RIP [] usbnet_generic_cdc_bind+0x171/0x710 [cdc_ether] [32509.277736] RSP [32509.277744] CR2: 0000000000000003 [32509.282629] ---[ end trace 5b59b3e9ec2e4364 ]--- [32589.181880] usb 1-1.6: USB disconnect, device number 7