Hi,
running a loop like this:
while true; do lsusb; done
and plugging my mtk phone in, the stack below happened.
Version: Linux c3po 4.2.0-18-generic #22-Ubuntu SMP Fri Nov 6 18:25:50
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Full dmesg: https://dl.dropboxusercontent.com/u/21820416/usb-crash.dmesg
Rgds,
Chris
[16323.481289] usb 5-3: USB disconnect, device number 5
[16602.047146] usb 9-3: new full-speed USB device number 5 using ohci-pci
[16602.215677] usb 9-3: config 1 has an invalid descriptor of length 0,
skipping remainder of the config
[16602.215682] usb 9-3: config 1 has 1 interface, different from the
descriptor's value: 2
[16602.215687] usb 9-3: New USB device found, idVendor=0e8d, idProduct=0003
[16602.215689] usb 9-3: New USB device strings: Mfr=0, Product=0,
SerialNumber=0
[16602.312280] BUG: unable to handle kernel NULL pointer dereference at
0000000000000008
[16602.312384] IP: [<ffffffffc08eb5e6>] acm_probe+0x186/0x1230 [cdc_acm]
[16602.312464] PGD 0
[16602.312489] Oops: 0000 [#1] SMP
[16602.312531] Modules linked in: cdc_acm(+) nfsv3 rpcsec_gss_krb5 nfsv4
nfs fscache rfcomm xt_addrtype xt_conntrack ipt_MASQUERADE
nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4
nf_nat_ipv4 iptable_filter ip_tables x_tables nf_nat nf_conntrack bridge
stp llc dm_thin_pool dm_persistent_data dm_bio_prison dm_bufio libcrc32c
pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) binfmt_misc
vboxdrv(OE) bnep btusb btrtl btbcm btintel bluetooth input_leds joydev
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi kvm_amd
kvm snd_hda_intel edac_core snd_hda_codec snd_hda_core serio_raw
snd_seq_midi k10temp snd_seq_midi_event snd_hwdep edac_mce_amd
snd_rawmidi snd_pcm i2c_piix4 snd_seq snd_seq_device snd_timer
asus_atk0110 8250_fintek snd mac_hid soundcore shpchp nfsd hwmon_vid
[16602.313551] auth_rpcgss msr nfs_acl parport_pc lockd grace ppdev
sunrpc lp parport autofs4 raid10 raid456 async_raid6_recov async_memcpy
async_pq async_xor async_tx xor raid6_pq raid1 multipath linear raid0
uas usb_storage pata_acpi hid_generic usbhid hid amdkfd amd_iommu_v2
radeon firewire_ohci psmouse i2c_algo_bit ttm r8169 firewire_core mii
drm_kms_helper crc_itu_t ahci drm libahci pata_jmicron wmi
[16602.314040] CPU: 1 PID: 9808 Comm: systemd-udevd Tainted: G
OE 4.2.0-18-generic #22-Ubuntu
[16602.314155] Hardware name: System manufacturer System Product
Name/M4A89GTD-PRO/USB3, BIOS 2301 07/18/2011
[16602.314277] task: ffff88021181f080 ti: ffff880212e78000 task.ti:
ffff880212e78000
[16602.314367] RIP: 0010:[<ffffffffc08eb5e6>] [<ffffffffc08eb5e6>]
acm_probe+0x186/0x1230 [cdc_acm]
[16602.314478] RSP: 0018:ffff880212e7b9f8 EFLAGS: 00010246
[16602.314543] RAX: 0000000000000000 RBX: ffff880214422000 RCX:
ffff8801c5550400
[16602.314629] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
0000000000000001
[16602.314715] RBP: ffff880212e7bab8 R08: ffff8802131ca1f8 R09:
0000000000000000
[16602.314802] R10: ffffea0000093600 R11: 0000000000000020 R12:
ffff880214422000
[16602.314888] R13: ffffffffc08f0108 R14: ffff88010269cf72 R15:
0000000000000013
[16602.314976] FS: 00007f634d0068c0(0000) GS:ffff88021fc40000(0000)
knlGS:00000000f7542940
[16602.315075] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[16602.315144] CR2: 0000000000000008 CR3: 000000012f011000 CR4:
00000000000006e0
[16602.315230] Stack:
[16602.315254] ffff88021181f080 ffffffff81277334 00000000ffffffea
0000000000000000
[16602.315347] ffff880212e7ba58 ffffffff812779ae ffff8802131ca7f8
000000009f186511
[16602.315440] ffff880214422090 ffff880200000010 0000000000000000
ffff880214422140
[16602.315533] Call Trace:
[16602.315566] [<ffffffff81277334>] ? kernfs_link_sibling+0x94/0xc0
[16602.315640] [<ffffffff812779ae>] ? kernfs_add_one+0xee/0x140
[16602.315712] [<ffffffff815e4562>] usb_probe_interface+0x1b2/0x2d0
[16602.315787] [<ffffffff81520b0a>] driver_probe_device+0x21a/0x490
[16602.315861] [<ffffffff81520e10>] __driver_attach+0x90/0xa0
[16602.315928] [<ffffffff81520d80>] ? driver_probe_device+0x490/0x490
[16602.316005] [<ffffffff8151e6ac>] bus_for_each_dev+0x6c/0xc0
[16602.316074] [<ffffffff815202ae>] driver_attach+0x1e/0x20
[16602.316140] [<ffffffff8151fddb>] bus_add_driver+0x1eb/0x280
[16602.316210] [<ffffffff815216b0>] driver_register+0x60/0xe0
[16602.316277] [<ffffffff815e2e74>] usb_register_driver+0x84/0x140
[16602.316351] [<ffffffffc0863000>] ? 0xffffffffc0863000
[16602.316414] [<ffffffffc08630c3>] acm_init+0xc3/0x1000 [cdc_acm]
[16602.316489] [<ffffffff81002123>] do_one_initcall+0xb3/0x200
[16602.316558] [<ffffffff811c2835>] ? __vunmap+0x95/0xf0
[16602.316622] [<ffffffff811de027>] ? kmem_cache_alloc_trace+0x187/0x1f0
[16602.316702] [<ffffffff817e66c8>] ? do_init_module+0x28/0x1e7
[16602.316772] [<ffffffff817e6700>] do_init_module+0x60/0x1e7
[16602.316840] [<ffffffff81102876>] load_module+0x1676/0x1c10
[16602.316907] [<ffffffff810fe9c0>] ? __symbol_put+0x60/0x60
[16602.316975] [<ffffffff81202f80>] ? kernel_read+0x50/0x80
[16602.317041] [<ffffffff81103069>] SyS_finit_module+0xb9/0xf0
[16602.317111] [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
[16602.317189] Code: 0f 84 26 02 00 00 44 39 6d 98 74 0d f6 05 d4 4c 00
00 04 0f 85 24 09 00 00 48 8b 4d b8 48 39 4d c8 0f 84 36 09 00 00 48 8b
45 c8 <48> 8b 40 08 80 78 05 0a 0f 84 7e 02 00 00 48 8b 45 b8 48 8b 40
[16602.317506] RIP [<ffffffffc08eb5e6>] acm_probe+0x186/0x1230 [cdc_acm]
[16602.317590] RSP <ffff880212e7b9f8>
[16602.317631] CR2: 0000000000000008
[16602.351424] ---[ end trace c6faa535f8cd71f5 ]---
[16605.324490] usb 9-3: USB disconnect, device number 5