bug report cxusb oops

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hi

using the experimental version of the media stack and i get this

[   80.606898] dvb-usb: found a 'DViCO FusionHDTV DVB-T NANO2 w/o firmware' in cold state, will try to load a firmware [   80.620010] dvb-usb: downloading firmware from file 'dvb-usb-bluebird-02.fw'
[   80.656195] usbcore: registered new interface driver dvb_usb_cxusb
[   80.688792] usb 3-1: USB disconnect, device number 2
[   80.688826] BUG: unable to handle kernel paging request at 0000000000002db8
[   80.688830] PGD 0 P4D 0
[   80.688834] Oops: 0000 [#1] PREEMPT SMP PTI
[   80.688838] CPU: 2 PID: 26 Comm: kworker/2:0 Tainted: G           OE     4.18.0-10-lowlatency #11-Ubuntu [   80.688840] Hardware name: Hewlett-Packard HP EliteBook 8460p/161C, BIOS 68SCF Ver. F.67 02/13/2018
[   80.688846] Workqueue: usb_hub_wq hub_event
[   80.688852] RIP: 0010:cxusb_disconnect+0x18/0x70 [dvb_usb_cxusb]
[   80.688853] Code: 85 c0 75 e7 31 c0 48 c7 02 00 00 00 00 5d c3 0f 1f 00 66 66 66 66 90 55 48 89 e5 41 55 41 54 49 89 fc 53 48 8b 87 c8 00 00 00 <4c> 8b a8 b8 2d 00 00 49 8b 5d 10 48 85 db 74 18 48 8b 83 a8 00 00
[   80.688885] RSP: 0018:ffffa44f00d97b68 EFLAGS: 00010246
[   80.688888] RAX: 0000000000000000 RBX: ffff98db2dad3030 RCX: 0000000000000000 [   80.688890] RDX: 0000000000000000 RSI: ffff98db2dad3000 RDI: ffff98db2dad3000 [   80.688891] RBP: ffffa44f00d97b80 R08: 0000000000000000 R09: ffffffff95335b00 [   80.688893] R10: ffff98db2ef01660 R11: 0000000000000001 R12: ffff98db2dad3000 [   80.688895] R13: ffffffffc10530a8 R14: ffff98db307d7000 R15: ffff98db307d70a0 [   80.688898] FS:  0000000000000000(0000) GS:ffff98db3dc80000(0000) knlGS:0000000000000000
[   80.688900] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   80.688902] CR2: 0000000000002db8 CR3: 000000010ae0a001 CR4: 00000000000606e0
[   80.688904] Call Trace:
[   80.688911]  usb_unbind_interface+0x7a/0x280
[   80.688916]  device_release_driver_internal+0x18c/0x260
[   80.688919]  device_release_driver+0x12/0x20
[   80.688922]  bus_remove_device+0xec/0x160
[   80.688925]  device_del+0x13b/0x350
[   80.688928]  ? __dev_printk+0x44/0x70
[   80.688932]  usb_disable_device+0x9f/0x270
[   80.688935]  usb_disconnect+0xca/0x2c0
[   80.688938]  hub_port_connect+0x85/0xa70
[   80.688941]  port_event+0x45b/0x6d0
[   80.688945]  hub_event+0x14f/0x3b0
[   80.688951]  process_one_work+0x208/0x3f0
[   80.688954]  worker_thread+0x34/0x3f0
[   80.688958]  kthread+0x120/0x140
[   80.688961]  ? rescuer_thread+0x390/0x390
[   80.688964]  ? kthread_create_worker_on_cpu+0x70/0x70
[   80.688967]  ret_from_fork+0x35/0x40
[   80.688970] Modules linked in: dvb_usb_cxusb(OE) dib0070(OE) dvb_usb(OE) dvb_core(OE) rc_core(OE) rfcomm rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache ccm bnep snd_hda_codec_hdmi snd_hda_codec_idt hp_wmi snd_hda_codec_generic snd_hda_intel snd_hda_codec arc4 sparse_keymap iwldvm mac80211 intel_rapl x86_pkg_temp_thermal intel_powerclamp uvcvideo(OE) videobuf2_vmalloc(OE) videobuf2_memops(OE) videobuf2_v4l2(OE) coretemp wmi_bmof videobuf2_common(OE) videodev(OE) snd_hda_core snd_hwdep media(OE) kvm irqbypass crct10dif_pclmul crc32_pclmul btusb ghash_clmulni_intel btrtl iwlwifi pcbc snd_pcm aesni_intel joydev btbcm input_leds snd_seq_midi snd_seq_midi_event btintel aes_x86_64 crypto_simd cryptd bluetooth glue_helper intel_cstate i915 ecdh_generic intel_rapl_perf hp_accel drm_kms_helper drm [   80.689018]  lis3lv02d snd_rawmidi serio_raw mei_me i2c_algo_bit fb_sys_fops syscopyarea sysfillrect cfg80211 wmi tpm_infineon snd_seq snd_seq_device snd_timer mei sysimgblt input_polldev snd soundcore video mac_hid sch_fq_codel cuse parport_pc ppdev lp parport sunrpc ip_tables x_tables autofs4 gpio_ich ahci psmouse libahci lpc_ich firewire_ohci sdhci_pci e1000e firewire_core cqhci sdhci crc_itu_t
[   80.689047] CR2: 0000000000002db8
[   80.689050] ---[ end trace b4ada9b289256086 ]---
[   80.689054] RIP: 0010:cxusb_disconnect+0x18/0x70 [dvb_usb_cxusb]
[   80.689056] Code: 85 c0 75 e7 31 c0 48 c7 02 00 00 00 00 5d c3 0f 1f 00 66 66 66 66 90 55 48 89 e5 41 55 41 54 49 89 fc 53 48 8b 87 c8 00 00 00 <4c> 8b a8 b8 2d 00 00 49 8b 5d 10 48 85 db 74 18 48 8b 83 a8 00 00
[   80.689090] RSP: 0018:ffffa44f00d97b68 EFLAGS: 00010246
[   80.689092] RAX: 0000000000000000 RBX: ffff98db2dad3030 RCX: 0000000000000000 [   80.689093] RDX: 0000000000000000 RSI: ffff98db2dad3000 RDI: ffff98db2dad3000 [   80.689095] RBP: ffffa44f00d97b80 R08: 0000000000000000 R09: ffffffff95335b00 [   80.689097] R10: ffff98db2ef01660 R11: 0000000000000001 R12: ffff98db2dad3000 [   80.689098] R13: ffffffffc10530a8 R14: ffff98db307d7000 R15: ffff98db307d70a0 [   80.689101] FS:  0000000000000000(0000) GS:ffff98db3dc80000(0000) knlGS:0000000000000000
[   80.689103] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   80.689105] CR2: 0000000000002db8 CR3: 000000010ae0a001 CR4: 00000000000606e0




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