[Bug 96476] KVM switch cause a Oops and input devices loss

Arnaud Quette aquette.dev at gmail.com
Mon Mar 26 14:14:59 UTC 2007 

Public bug reported:

Binary package hint: linux-image-2.6-amd64-generic

having an USB KVM (mine is a Avocent SwitchView USB, 4 ports)

- boot the system,
- get an ssh access to monitor the log,
- switch to another box, using the KVM

there you are:
linux-amd64 kernel: [ 2094.596780] CR2: 0000000000000120
Mar 26 16:09:25 linux-amd64 kernel: [ 1954.313681]  <6>usb 1-5: USB disconnect, address 8
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596449] PGD 400d067 PUD 45ec067 PMD 0 
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596455] CPU 0 
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596456] Modules linked in: binfmt_misc rfcomm l2cap bluetooth ppdev powernow_k8 cpufreq_ondemand cpufreq_powersave cpufreq_conservative cpufreq_stats freq_table cpufreq_userspace sony_acpi pcc_acpi tc1100_wmi dev_acpi container button sbs video i2c_ec dock ac asus_acpi battery backlight af_packet parport_pc lp parport fuse snd_hda_intel snd_hda_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device psmouse snd soundcore pcspkr serio_raw i2c_nforce2 snd_page_alloc k8temp shpchp pci_hotplug i2c_core ipv6 tsdev joydev evdev ext3 jbd mbcache sg sr_mod cdrom sd_mod generic ata_generic usbhid hid b44 mii sata_nv libata scsi_mod ehci_hcd ohci_hcd usbcore thermal processor fan fbcon tileblit font bitblit softcursor vesafb cfbcopyarea cfbimgblt cfbfillrect capability commoncap
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596502] Pid: 2055, comm: khubd Not tainted 2.6.20-9-generic #2
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596505] RIP: 0010:[class_device_remove_attrs+11/80]  [class_device_remove_attrs+11/80] class_device_remove_attrs+0xb/0x50
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596510] RSP: 0018:ffff81001b87bc40  EFLAGS: 00010282
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596513] RAX: 00000000fffffffe RBX: ffff810019dab580 RCX: ffffffff880636d0
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596517] RDX: ffff810019cf5800 RSI: 485355fc89495441 RDI: ffff810019dab580
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596519] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596522] R10: 0000000000000001 R11: ffffffff80230640 R12: ffff810019dab580
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596524] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596528] FS:  00002b1992b236f0(0000) GS:ffffffff80543000(0000) knlGS:0000000000000000
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596530] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596533] CR2: 0000000000000120 CR3: 0000000018f65000 CR4: 00000000000006e0
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596536] Process khubd (pid: 2055, threadinfo ffff81001b87a000, task ffff81000130c820)
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596538] Stack:  ffff810019dab580 ffff810019dab580 ffff810019dab590 ffffffff803a4e7b
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596545]  ffff81001bd2e280 ffff810019dab580 ffff810019cf5800 0000000000000002
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596549]  0000000000000002 ffff810019cf5888 ffff81001a2f9ca0 ffffffff803a4ec9
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596553] Call Trace:
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596559]  [class_device_del+299/368] class_device_del+0x12b/0x170
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596566]  [class_device_unregister+9/32] class_device_unregister+0x9/0x20
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596587]  [_end+128074410/2130539984] :usbcore:usbdev_notify+0x8a/0xa0
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596592]  [complete+64/96] complete+0x40/0x60
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596597]  [notifier_call_chain+38/64] notifier_call_chain+0x26/0x40
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596604]  [blocking_notifier_call_chain+63/112] blocking_notifier_call_chain+0x3f/0x70
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596619]  [_end+128081236/2130539984] :usbcore:usb_notify_remove_device+0x24/0x40
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596632]  [_end+128081337/2130539984] :usbcore:generic_disconnect+0x9/0x30
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596644]  [_end+128051157/2130539984] :usbcore:usb_unbind_device+0x15/0x20
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596648]  [__device_release_driver+145/192] __device_release_driver+0x91/0xc0
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596653]  [device_release_driver+56/96] device_release_driver+0x38/0x60
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596658]  [bus_remove_device+137/176] bus_remove_device+0x89/0xb0
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596664]  [device_del+418/544] device_del+0x1a2/0x220
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596677]  [_end+128027922/2130539984] :usbcore:usb_disconnect+0xc2/0x150
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596693]  [_end+128031946/2130539984] :usbcore:hub_thread+0x43a/0xcd0
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596699]  [thread_return+0/255] thread_return+0x0/0xff
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596708]  [autoremove_wake_function+0/48] autoremove_wake_function+0x0/0x30
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596724]  [_end+128030864/2130539984] :usbcore:hub_thread+0x0/0xcd0
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596727]  [keventd_create_kthread+0/144] keventd_create_kthread+0x0/0x90
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596733]  [kthread+217/288] kthread+0xd9/0x120
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596738]  [__call_usermodehelper+0/128] __call_usermodehelper+0x0/0x80
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596745]  [child_rip+10/18] child_rip+0xa/0x12
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596749]  [keventd_create_kthread+0/144] keventd_create_kthread+0x0/0x90
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596758]  [kthread+0/288] kthread+0x0/0x120
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596762]  [child_rip+0/18] child_rip+0x0/0x12
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596766] 
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596767] 
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596768] Code: 48 8b b5 20 01 00 00 48 85 f6 74 27 48 83 3e 00 74 21 bb 28 
Mar 26 16:09:25 linux-amd64 kernel: [ 2094.596779]  RSP <ffff81001b87bc40>

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
KVM switch cause a Oops and input devices loss
https://launchpad.net/bugs/96476

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