USB modem cannot be used if removed then reattached

[أحمد المحمودي (Ahmed El-Mahmoudy)]

The problem is produced as follows:
* Attach the USB modem to the laptop
* Connect to the internet using the modem
* Disconnect from the internet
* Remove USB modem
* Attach USB modem

It doesn't get detected by the system, and I get kernel oops,

[26528.139666] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[26528.139753] IP: [<ffffffffa05e062f>] usb_wwan_write+0x12f/0x2e0 [usb_wwan]
[26528.139809] PGD 658b4067 PUD 65e7b067 PMD 0
[26528.139844] Oops: 0000 [#1] SMP
[26528.139871] Modules linked in: ctr ccm ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables ppp_deflate bsd_comp ppp_async crc_ccitt cryptoloop nls_utf8 isofs pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) cuse huawei_cdc_ncm cdc_wdm cdc_ncm usbnet option usb_wwan mii usbserial rfcomm bnep nfsd auth_rpcgss nfs_acl binfmt_misc nfs lockd sunrpc fscache btusb bluetooth snd_hda_codec_hdmi snd_hda_codec_idt usb_storage gpio_ich dell_wmi sparse_keymap dell_laptop dcdbas arc4 coretemp kvm_intel snd_hda_intel kvm snd_hda_codec snd_hwdep snd_pcm pcmcia snd_page_alloc pcspkr snd_seq_midi snd_seq_midi_event snd_rawmidi joydev b43 serio_raw bcma mac80211 snd_seq cfg80211 snd_seq_device snd_timer yenta_socket pcmcia_rsrc pcmcia_core lpc_ich snd soundcore mac_hid wmi parport_pc ppdev lp parport i915 video drm_kms_helper drm i2c_algo_bit hid_generic usbhid hid psmouse firewire_ohci tg3 sdhci_pci ahci sdhci libahci firewire_core crc_itu_t ptp pps_core ssb
[26528.142710] CPU: 0 PID: 938 Comm: ModemManager Tainted: GF O 3.13.0-29-generic #53-Ubuntu
[26528.143497] Hardware name: Dell Inc. Latitude E5500 /0DW634, BIOS A11 04/15/2009
[26528.143497] task: ffff8800753147d0 ti: ffff880065a02000 task.ti: ffff880065a02000
[26528.143497] RIP: 0010:[<ffffffffa05e062f>] [<ffffffffa05e062f>] usb_wwan_write+0x12f/0x2e0 [usb_wwan]
[26528.143497] RSP: 0018:ffff880065a03d58 EFLAGS: 00010283
[26528.143497] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000001
[26528.143497] RDX: 0000000000000000 RSI: 0000000000220020 RDI: 0000000000000202
[26528.143497] RBP: ffff880065a03dd0 R08: 0000000000000000 R09: 0000000000000000
[26528.143497] R10: ffff88007a401500 R11: 0000000000000293 R12: 0000000000001000
[26528.143497] R13: 0000000000000000 R14: 0000000000000000 R15: ffff880064eb3500
[26528.143497] FS: 00007fddcb75a840(0000) GS:ffff88007d000000(0000) knlGS:0000000000000000
[26528.143497] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[26528.143497] CR2: 0000000000000068 CR3: 0000000065892000 CR4: 00000000000007f0
[26528.143497] Stack:
[26528.143497] ffff8800069762e8 ffff880064eb3500 000000018144d209 ffff880064eb3590
[26528.143497] dead000000100100 ffff880006976000 00001c0465e6aa28 ffff880065e68000
[26528.143497] ffff880064eb3580 ffff88004ee492e0 ffff88004ebdbc00 ffff880006976000
[26528.143497] Call Trace:
[26528.143497] [<ffffffffa06ed96d>] serial_write+0x4d/0xb0 [usbserial]
[26528.143497] [<ffffffff81448e7d>] n_tty_write+0x32d/0x500
[26528.143497] [<ffffffff8109a7a0>] ? wake_up_state+0x20/0x20
[26528.143497] [<ffffffff81445808>] tty_write+0x148/0x2a0
[26528.143497] [<ffffffff81448b50>] ? process_echoes+0x70/0x70
[26528.143497] [<ffffffff811bc814>] vfs_write+0xb4/0x1f0
[26528.143497] [<ffffffff811bd249>] SyS_write+0x49/0xa0
[26528.143497] [<ffffffff8172adff>] tracesys+0xe1/0xe6
[26528.143497] Code: 04 0f 85 28 01 00 00 48 8b 45 b0 48 8b 00 48 8b 78 10 e8 55 4b f6 e0 85 c0 0f 88 bd 00 00 00 81 fb 00 10 00 00 41 bc 00 10 00 00 <49> 8b 7d 68 44 0f 4e e3 48 8b 75 c0 49 63 c4 48 89 c2 48 89 45
[26528.143497] RIP [<ffffffffa05e062f>] usb_wwan_write+0x12f/0x2e0 [usb_wwan]
[26528.143497] RSP <ffff880065a03d58>
[26528.143497] CR2: 0000000000000068
[26528.212077] ---[ end trace 8b88787e2b327dca ]---
[26528.238437] option1 ttyUSB0: option_instat_callback: error -108
[26528.238629] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[26528.238651] option 2-1:1.0: device disconnected
[26528.240035] option1 ttyUSB1: option_instat_callback: error -108

This time I got the following usb_modeswitch error, then when I removed/reattached the modem I got the kernel oops:

[26402.536135] usb 2-1: new high-speed USB device number 16 using ehci-pci
[26403.068210] usb 2-1: device not accepting address 16, error -71
[26403.180050] usb 2-1: new high-speed USB device number 17 using ehci-pci
[26403.304270] usb 2-1: device descriptor read/64, error -71
[26403.944211] usb 2-1: device not accepting address 17, error -71
[26404.060139] usb 2-1: new high-speed USB device number 18 using ehci-pci
[26404.085496] usb 2-1: New USB device found, idVendor=12d1, idProduct=14fe
[26404.085502] usb 2-1: New USB device strings: Mfr=2, Product=1, SerialNumber=0
[26404.085506] usb 2-1: Product: HUAWEI Mobile
[26404.085509] usb 2-1: Manufacturer: HUAWEI
[26404.089629] usb 2-1: can't set config #1, error -71
[26405.500961] usb_modeswitch[22889]: segfault at 10 ip 00000000004023ad sp 00007fffb2fbdc70 error 4 in usb_modeswitch[400000+c000]

Also, when I decide to poweroff/reboot the laptop it doesn't completely turn off, and the plymouth animation goes forever, I just have to keep pressing the power button to force it to turn off.

I have attached the while dmesg of this session.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: usb-modeswitch 2.1.1+repack0-1ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: GNOME
Date: Sat Jun 14 17:23:11 2014
InstallationDate: Installed on 2011-07-23 (1056 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
SourcePackage: usb-modeswitch
UpgradeStatus: Upgraded to trusty on 2014-03-04 (102 days ago)

[Lars Melin (larsm17)]

This is not an usb_modeswitch problem, it is a usb core or hub driver problem.
It causes a device connect/disconnect/connect/disconnect loop not only for the 3G modem but also for the Samsung Android device:

[ 7387.580579] usb 2-3: USB disconnect, device number 6
[ 7387.860066] usb 2-3: new high-speed USB device number 7 using ehci-pci
[ 7387.993516] usb 2-3: New USB device found, idVendor=04e8, idProduct=6860
[ 7387.993524] usb 2-3: New USB device strings: Mfr=2, Product=3, SerialNumber=4
.
.
.
[14103.048295] usb 2-3: USB disconnect, device number 13
[14106.560123] usb 2-4: new high-speed USB device number 14 using ehci-pci
[14106.693349] usb 2-4: New USB device found, idVendor=04e8, idProduct=6860
[14106.693356] usb 2-4: New USB device strings: Mfr=2, Product=3, SerialNumber=4

[Rolf Leggewie (r0lf)]

reassigning to the kernel for further triage

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1330076

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]