On remove usb rtl8192su (r8712u module) wifi card - kernel error (kde screen corrupt and comp stop working)

[unicorp99]

On remove usb rtl8192su (r8712u module) wifi card - kernel error (screen corrupt with dump error and notebook stop working)

linux-image-3.2.0-23-generic-pae
error also on network-manager stop

usb wifi stick - Trendnet TEW-646UBH
NOTEBOOK Q330-JS Core i3

error list from 3.2.0 ubuntu kernel:

Apr 19 08:48:37 book kernel: [ 122.830849] usb 2-1.1: USB disconnect, device number 4
Apr 19 08:48:37 book kernel: [ 123.033517] ------------[ cut here ]------------
Apr 19 08:48:37 book kernel: [ 123.033530] WARNING: at /build/buildd/linux-3.2.0/mm/vmalloc.c:1438 __vunmap+0x40/0x50()
Apr 19 08:48:37 book kernel: [ 123.033534] Hardware name: Q330
Apr 19 08:48:37 book kernel: [ 123.033537] Trying to vfree() bad address (c1837d40)
Apr 19 08:48:37 book kernel: [ 123.033541] Modules linked in: r8712u(C) pci_stub vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) dm_crypt joydev snd_hda_codec_hdmi snd_hda_codec_realtek snd
_hda_intel snd_hda_codec snd_hwdep uvcvideo snd_pcm videodev snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq nvidia(P) snd_timer snd_seq_device arc4 bnep ath9k rfcomm mac80211 bluetooth at
h9k_common ath9k_hw parport_pc snd ath mei(C) ppdev soundcore cfg80211 psmouse snd_page_alloc serio_raw intel_ips mac_hid coretemp lp parport usbhid hid i915 drm_kms_helper sky2 drm i2c_algo_b
it video
Apr 19 08:48:37 book kernel: [ 123.033612] Pid: 31, comm: khubd Tainted: P C O 3.2.0-23-generic-pae #36-Ubuntu
Apr 19 08:48:37 book kernel: [ 123.033616] Call Trace:
Apr 19 08:48:37 book kernel: [ 123.033625] [<c105a512>] warn_slowpath_common+0x72/0xa0
Apr 19 08:48:37 book kernel: [ 123.033630] [<c1123550>] ? __vunmap+0x40/0x50
Apr 19 08:48:37 book kernel: [ 123.033634] [<c1123550>] ? __vunmap+0x40/0x50
Apr 19 08:48:37 book kernel: [ 123.033639] [<c105a5e3>] warn_slowpath_fmt+0x33/0x40
Apr 19 08:48:37 book kernel: [ 123.033643] [<c1123550>] __vunmap+0x40/0x50
Apr 19 08:48:37 book kernel: [ 123.033647] [<c1123589>] vunmap+0x29/0x30
Apr 19 08:48:37 book kernel: [ 123.033653] [<c138f3f4>] firmware_free_data+0x14/0x60
Apr 19 08:48:37 book kernel: [ 123.033657] [<c138f47e>] release_firmware+0x3e/0x50
Apr 19 08:48:37 book kernel: [ 123.033670] [<f93bebd5>] netdev_close+0x65/0xb0 [r8712u]
Apr 19 08:48:37 book kernel: [ 123.033675] [<c14a8209>] __dev_close_many+0x69/0xb0
Apr 19 08:48:37 book kernel: [ 123.033683] [<c1036458>] ? default_spin_lock_flags+0x8/0x10
Apr 19 08:48:37 book kernel: [ 123.033687] [<c14a82fe>] dev_close_many+0x6e/0xc0
Apr 19 08:48:37 book kernel: [ 123.033692] [<c14a83f7>] rollback_registered_many+0xa7/0x1c0
Apr 19 08:48:37 book kernel: [ 123.033698] [<c1079d70>] ? add_wait_queue+0x50/0x50
Apr 19 08:48:37 book kernel: [ 123.033702] [<c14a8594>] rollback_registered+0x24/0x40
Apr 19 08:48:37 book kernel: [ 123.033707] [<c14a98bf>] unregister_netdevice_queue+0x4f/0xb0
Apr 19 08:48:37 book kernel: [ 123.033712] [<c15a6b88>] ? mutex_lock+0x18/0x40
Apr 19 08:48:37 book kernel: [ 123.033716] [<c14a99f9>] unregister_netdev+0x19/0x30
Apr 19 08:48:37 book kernel: [ 123.033727] [<f93bea64>] r871xu_dev_remove+0x54/0xd0 [r8712u]
Apr 19 08:48:37 book kernel: [ 123.033732] [<c1414ffc>] usb_unbind_interface+0x3c/0x140
Apr 19 08:48:37 book kernel: [ 123.033740] [<c138407b>] __device_release_driver+0x5b/0xb0
Apr 19 08:48:37 book kernel: [ 123.033745] [<c13840f4>] device_release_driver+0x24/0x40
Apr 19 08:48:37 book kernel: [ 123.033749] [<c1383c6a>] bus_remove_device+0x5a/0x80
Apr 19 08:48:37 book kernel: [ 123.033754] [<c1381987>] device_del+0xe7/0x150
Apr 19 08:48:37 book kernel: [ 123.033758] [<c1413061>] usb_disable_device+0x91/0x1a0
Apr 19 08:48:37 book kernel: [ 123.033765] [<c140cc52>] usb_disconnect+0x92/0x120
Apr 19 08:48:37 book kernel: [ 123.033770] [<c140d91a>] hub_port_connect_change+0x8a/0x640
Apr 19 08:48:37 book kernel: [ 123.033774] [<c14126ab>] ? usb_control_msg+0xdb/0x100
Apr 19 08:48:37 book kernel: [ 123.033778] [<c1409dd0>] ? clear_port_feature+0x50/0x60
Apr 19 08:48:37 book kernel: [ 123.033783] [<c140e2fd>] hub_events+0x42d/0x560
Apr 19 08:48:37 book kernel: [ 123.033788] [<c1079e6d>] ? finish_wait+0x4d/0x70
Apr 19 08:48:37 book kernel: [ 123.033792] [<c140e430>] ? hub_events+0x560/0x560
Apr 19 08:48:37 book kernel: [ 123.033796] [<c140e455>] hub_thread+0x25/0x140
Apr 19 08:48:37 book kernel: [ 123.033801] [<c1079d70>] ? add_wait_queue+0x50/0x50
Apr 19 08:48:37 book kernel: [ 123.033805] [<c107956d>] kthread+0x6d/0x80
Apr 19 08:48:37 book kernel: [ 123.033810] [<c1079500>] ? flush_kthread_worker+0x80/0x80
Apr 19 08:48:37 book kernel: [ 123.033817] [<c15af6be>] kernel_thread_helper+0x6/0x10
Apr 19 08:48:37 book kernel: [ 123.033820] ---[ end trace 207334237ca2d11b ]---
Apr 19 08:48:37 book kernel: [ 123.033830] BUG: unable to handle kernel paging request at c15bf4ce
Apr 19 08:48:37 book kernel: [ 123.033898] IP: [<c10fceeb>] __free_pages+0xb/0x40
Apr 19 08:48:37 book kernel: [ 123.033948] *pdpt = 0000000001938001 *pde = 0000000031b25063 *pte = 80000000015bf161
Apr 19 08:48:37 book kernel: [ 123.034024] Oops: 0003 [#1] SMP
Apr 19 08:48:37 book kernel: [ 123.034060] Modules linked in: r8712u(C) pci_stub vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) dm_crypt joydev snd_hda_codec_hdmi snd_hda_codec_realtek snd
_hda_intel snd_hda_codec snd_hwdep uvcvideo snd_pcm videodev snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq nvidia(P) snd_timer snd_seq_device arc4 bnep ath9k rfcomm mac80211 bluetooth at
h9k_common ath9k_hw parport_pc snd ath mei(C) ppdev soundcore cfg80211 psmouse snd_page_alloc serio_raw intel_ips mac_hid coretemp lp parport usbhid hid i915 drm_kms_helper sky2 drm i2c_algo_b
it video
Apr 19 08:48:37 book kernel: [ 123.034587]
Apr 19 08:48:37 book kernel: [ 123.034603] Pid: 31, comm: khubd Tainted: P WC O 3.2.0-23-generic-pae #36-Ubuntu SAMSUNG ELECTRONICS CO., LTD. Q330 /Q330

Apr 19 08:48:37 book kernel: [ 123.034748] EIP: 0060:[<c10fceeb>] EFLAGS: 00010206 CPU: 2
Apr 19 08:48:37 book kernel: [ 123.034800] EIP is at __free_pages+0xb/0x40
Apr 19 08:48:37 book kernel: [ 123.034839] EAX: c15bf4be EBX: 00000005 ECX: b9e0c114 EDX: 00000000
Apr 19 08:48:37 book kernel: [ 123.034896] ESI: f64953d0 EDI: f7723df4 EBP: f7723d60 ESP: f7723d60
Apr 19 08:48:37 book kernel: [ 123.034953] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Apr 19 08:48:37 book kernel: [ 123.035002] Process khubd (pid: 31, ti=f7722000 task=f75d4bc0 task.ti=f7722000)
Apr 19 08:48:37 book kernel: [ 123.035068] Stack:
Apr 19 08:48:37 book kernel: [ 123.035087] f7723d70 c138f41d f64953d0 f68d0480 f7723d7c c138f47e f68d0000 f7723d90
Apr 19 08:48:37 book kernel: [ 123.035169] f93bebd5 f7723d9c f68d0000 f7723df4 f7723dac c14a8209 f7723da0 f7723da4
Apr 19 08:48:37 book kernel: [ 123.035250] c1036458 f68d0000 f7723df4 f7723dcc c14a82fe f7723db8 f7723db8 f7723db8
Apr 19 08:48:37 book kernel: [ 123.035332] Call Trace:
Apr 19 08:48:37 book kernel: [ 123.035356] [<c138f41d>] firmware_free_data+0x3d/0x60
Apr 19 08:48:37 book kernel: [ 123.035405] [<c138f47e>] release_firmware+0x3e/0x50
Apr 19 08:48:37 book kernel: [ 123.035467] [<f93bebd5>] netdev_close+0x65/0xb0 [r8712u]
Apr 19 08:48:37 book kernel: [ 123.035547] [<c14a8209>] __dev_close_many+0x69/0xb0
Apr 19 08:48:37 book kernel: [ 123.035622] [<c1036458>] ? default_spin_lock_flags+0x8/0x10
Apr 19 08:48:37 book kernel: [ 123.035707] [<c14a82fe>] dev_close_many+0x6e/0xc0
Apr 19 08:48:37 book kernel: [ 123.035778] [<c14a83f7>] rollback_registered_many+0xa7/0x1c0
Apr 19 08:48:37 book kernel: [ 123.035865] [<c1079d70>] ? add_wait_queue+0x50/0x50
Apr 19 08:48:37 book kernel: [ 123.035938] [<c14a8594>] rollback_registered+0x24/0x40
Apr 19 08:48:37 book kernel: [ 123.036016] [<c14a98bf>] unregister_netdevice_queue+0x4f/0xb0
Apr 19 08:48:37 book kernel: [ 123.036102] [<c15a6b88>] ? mutex_lock+0x18/0x40
Apr 19 08:48:37 book kernel: [ 123.036170] [<c14a99f9>] unregister_netdev+0x19/0x30
Apr 19 08:48:37 book kernel: [ 123.036254] [<f93bea64>] r871xu_dev_remove+0x54/0xd0 [r8712u]
Apr 19 08:48:37 book kernel: [ 123.036340] [<c1414ffc>] usb_unbind_interface+0x3c/0x140
Apr 19 08:48:37 book kernel: [ 123.036421] [<c138407b>] __device_release_driver+0x5b/0xb0
Apr 19 08:48:37 book kernel: [ 123.040294] [<c13840f4>] device_release_driver+0x24/0x40
Apr 19 08:48:37 book kernel: [ 123.044157] [<c1383c6a>] bus_remove_device+0x5a/0x80
Apr 19 08:48:37 book kernel: [ 123.048007] [<c1381987>] device_del+0xe7/0x150
Apr 19 08:48:37 book kernel: [ 123.051794] [<c1413061>] usb_disable_device+0x91/0x1a0
Apr 19 08:48:37 book kernel: [ 123.055591] [<c140cc52>] usb_disconnect+0x92/0x120
Apr 19 08:48:37 book kernel: [ 123.059643] [<c140d91a>] hub_port_connect_change+0x8a/0x640
Apr 19 08:48:37 book kernel: [ 123.063442] [<c14126ab>] ? usb_control_msg+0xdb/0x100
Apr 19 08:48:37 book kernel: [ 123.067247] [<c1409dd0>] ? clear_port_feature+0x50/0x60
Apr 19 08:48:37 book kernel: [ 123.071053] [<c140e2fd>] hub_events+0x42d/0x560
Apr 19 08:48:37 book kernel: [ 123.074825] [<c1079e6d>] ? finish_wait+0x4d/0x70
Apr 19 08:48:37 book kernel: [ 123.078593] [<c140e430>] ? hub_events+0x560/0x560
Apr 19 08:48:37 book kernel: [ 123.082310] [<c140e455>] hub_thread+0x25/0x140
Apr 19 08:48:37 book kernel: [ 123.085976] [<c1079d70>] ? add_wait_queue+0x50/0x50
Apr 19 08:48:37 book kernel: [ 123.089615] [<c107956d>] kthread+0x6d/0x80
Apr 19 08:48:37 book kernel: [ 123.093177] [<c1079500>] ? flush_kthread_worker+0x80/0x80
Apr 19 08:48:37 book kernel: [ 123.096632] [<c15af6be>] kernel_thread_helper+0x6/0x10
Apr 19 08:48:37 book kernel: [ 123.099933] Code: ff ff 31 c9 89 da c7 04 24 04 00 00 00 e8 2e f5 ff ff eb 8e 8d b6 00 00 00 00 8d bf 00 00 00 00 55 89 e5 3e 8d 74 26 00 8b 48 10 <f0> ff 48 10
 0f 94 c1 84 c9 74 09 85 d2 74 0e e8 b1 fd ff ff 5d
Apr 19 08:48:37 book kernel: [ 123.106929] EIP: [<c10fceeb>] __free_pages+0xb/0x40 SS:ESP 0068:f7723d60
Apr 19 08:48:37 book kernel: [ 123.110377] CR2: 00000000c15bf4ce
Apr 19 08:48:37 book kernel: [ 123.137763] ---[ end trace 207334237ca2d11c ]---

on 3.3.2 last kernel (hand compile from sources from kernel.org) error list:

Apr 19 08:37:20 book kernel: [74034.345960] usb 2-1.1: USB disconnect, device number 5
Apr 19 08:37:20 book kernel: [74034.549942] ------------[ cut here ]------------
Apr 19 08:37:20 book kernel: [74034.549958] WARNING: at mm/vmalloc.c:1463 __vunmap+0xa0/0xe0()
Apr 19 08:37:20 book kernel: [74034.549963] Hardware name: Q330
Apr 19 08:37:20 book kernel: [74034.549967] Trying to vfree() bad address (c1819960)
Apr 19 08:37:20 book kernel: [74034.549972] Modules linked in: r8712u(C) dm_crypt joydev snd_hda_codec_hdmi ath9k_htc snd_hda_codec_realtek uvcvideo videobuf2_core videodev videobuf2_vmalloc v
ideobuf2_memops snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi arc4 snd_rawmidi ath9k mac80211 ath9k_common psmouse serio_raw ath9k_hw snd_seq_midi_event snd_seq bnep snd_timer snd
_seq_device rfcomm snd bluetooth parport_pc intel_ips ath ppdev cfg80211 soundcore snd_page_alloc mei(C) mac_hid coretemp lp parport usbhid hid i915 drm_kms_helper drm i2c_algo_bit sky2 video
Apr 19 08:37:20 book kernel: [74034.550061] Pid: 30, comm: khubd Tainted: G C 3.3.2-new #1
Apr 19 08:37:20 book kernel: [74034.550066] Call Trace:
Apr 19 08:37:20 book kernel: [74034.550077] [<c1041802>] warn_slowpath_common+0x72/0xa0
Apr 19 08:37:20 book kernel: [74034.550085] [<c1123660>] ? __vunmap+0xa0/0xe0
Apr 19 08:37:20 book kernel: [74034.550090] [<c1123660>] ? __vunmap+0xa0/0xe0
Apr 19 08:37:20 book kernel: [74034.550097] [<c10418d3>] warn_slowpath_fmt+0x33/0x40
Apr 19 08:37:20 book kernel: [74034.550103] [<c1123660>] __vunmap+0xa0/0xe0
Apr 19 08:37:20 book kernel: [74034.550109] [<c11236c9>] vunmap+0x29/0x30
Apr 19 08:37:20 book kernel: [74034.550120] [<c138ea74>] firmware_free_data+0x14/0x60
Apr 19 08:37:20 book kernel: [74034.550127] [<c138eafe>] release_firmware+0x3e/0x50
Apr 19 08:37:20 book kernel: [74034.550145] [<f93b15d5>] netdev_close+0x65/0xb0 [r8712u]
Apr 19 08:37:20 book kernel: [74034.550156] [<c14a8c09>] __dev_close_many+0x69/0xb0
Apr 19 08:37:20 book kernel: [74034.550163] [<c14a8cfe>] dev_close_many+0x6e/0xc0
Apr 19 08:37:20 book Apr 19 08:38:05 book kernel: imklog 5.8.6, log source = /proc/kmsg started.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-23-generic-pae 3.2.0-23.36
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic-pae 3.2.14
Uname: Linux 3.2.0-23-generic-pae i686
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu5
Architecture: i386
ArecordDevices:
 Home directory /home/user not ours.
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269VB Analog [ALC269VB Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: user 1920 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfc900000 irq 45'
   Mixer name : 'Intel IbexPeak HDMI'
   Components : 'HDA:10ec0269,144dc557,00100100 HDA:80862804,80860101,00100000'
   Controls : 25
   Simple ctrls : 12
Date: Thu Apr 19 08:52:38 2012
MachineType: SAMSUNG ELECTRONICS CO., LTD. Q330
ProcEnviron:
 LANGUAGE=
 TERM=xterm
 PATH=(custom, no user)
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic-pae root=UUID=571849f8-42f0-4361-8ab7-5c5fd0c4533c ro quiet splash vt.handoff=7
PulseList:
 Error: command ['pacmd', 'list'] failed with exit code 1: Home directory /home/user not ours.
 No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-23-generic-pae N/A
 linux-backports-modules-3.2.0-23-generic-pae N/A
 linux-firmware 1.79
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
StagingDrivers: r8712u mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/12/2010
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 05UU.M001.20101012.WZW
dmi.board.asset.tag: Tag 12345
dmi.board.name: Q330
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr05UU.M001.20101012.WZW:bd10/12/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnQ330:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnQ330:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: Q330
dmi.product.version: Not Applicable
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

[Joseph Salisbury (jsalisbury)]

Do you know if this issue happened in a previous version of Ubuntu, or is this a new issue?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.4kernel[1] (Not a kernel in the daily directory). Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag(Only that one tag, please leave the other tags). This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text.

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4-rc3-precise/

[unicorp99 (unicorp99)]

I buy usb stick three days age. On early ubuntu version how work - unknown..

Thank for link on 3.4-rc version ubuntu kernel. In 3.4-rc this device TEW-646UBH work NORMALLY, without black screen of death on remove..

Error with "Black scrren of death" only on 3.2 and 3.3 kernel.

In driver R8712u this stick work in minimal mode, not monitor mode (aircrack dump, aircrack mon)...

Wait for front news.

[Fernando (favlibo)]

After googling I've arrieved to this bug. The same happens to me.
I have a Belkin USB WiFi adapter, output from "lsusb":
Bus 002 Device 002: ID 050d:845a Belkin Components F7D2101 802.11n Surf & Share Wireless Adapter v1000 [Realtek RTL8192SU]
It works in previous version of Ubuntu (11.10 - Oneiric), but after distro update the problem of this bug appear.

I've achieved to solve the problem, and just for sharing the things I did was:
1) I tried to update to kernel 3.4-rc4 as Joseph suggested, but it happens the same.
2) I tried to downgrade to kernel 3.0.0-17, the same that Oneiric used, and voilá now it works.

I read, googling, that the driver r8712u (used by Realtek RTL8192SU) is broken in kernels 3.2 and 3.3. And, at least for me, is broken too for version 3.4.

Thank you all.

[Peter Hancock (hancock)]

I can add a little to the information above. I've
Bus 001 Device 003: ID 0bda:8172 Realtek Semiconductor Corp. RTL8191SU 802.11n WLAN Adapter
With vmlinuz-3.2.0-24-generic, kern.log included the following, after (I think, merely) typing "ifconfig":
Apr 29 09:42:17 asparagus kernel: [ 52.248060] WARNING: at /build/buildd/linux-3.2.0/mm/vmalloc.c:1438 __vunmap+0x40/0x50()
Apr 29 09:42:17 asparagus kernel: [ 52.248065] Hardware name:
Apr 29 09:42:17 asparagus kernel: [ 52.248067] Trying to vfree() bad address (3a36303a)
Apr 29 09:42:17 asparagus kernel: [ 52.248071] Modules linked in: bnep rfcomm bluetooth binfmt_misc dm_crypt snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi sn
d_seq_midi_event snd_seq ppdev snd_timer snd_seq_device snd parport_pc soundcore snd_page_alloc r8712u(C) mac_hid lp parport usbhid hid vesafb 3c59x floppy
Apr 29 09:42:17 asparagus kernel: [ 52.248129] Pid: 1790, comm: ifconfig Tainted: G C 3.2.0-24-generic #37-Ubuntu

.. and a call trace (I can supply if needed). The part implicating the dongle seemed to be:
Apr 29 09:42:17 asparagus kernel: [ 52.248381] EIP is at firmware_free_data+0x30/0x60

In general 3.2.0-24 was subject to hangs/freezes when trying to anything involving the network (like reporting a bug).

I then booted vmlinuz-3.0.0-17-generic, the last kernel under 11.10, and it (continued to) work fine. I then tried
a couple of recent upstream kernels, the last being 3.4.0-999-generic #201205060405. They both worked
fine, so far as the dongle was concerned. But both these seemed to have serious ext4 bugs (to do with
ext4_mb_generate_buddy, brought on using rsync). So, devil vs. deep blue sea.
(I cannot explain why Fernando had problems with 3.4-rc.)

By the way, the link: http://www.kernel.org/doc/local/git-quick.html#bisect
at https://wiki.ubuntu.com/Kernel/Bugs appears to be broken.

[Launchpad Janitor (janitor)]

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