Re: PROBLEM: HIDRAW: /dev/hidraw* device does not get removed when unplugged

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On Wed, 11 Aug 2010, Alan Ott wrote:

> Hello,
> 
> I'm having a bit of trouble with hidraw (with a USB device) and device
> removal. When I remove a device and re-attach it, the original device does not
> get removed, and another node is added to /dev.
> 
> At boot:
>     no /dev/hidraw devices exist
> 
> attach a device:
>     /dev/hidraw0 exists
> 
> detach the device:
>     /dev/hidraw0 remains
> 
> re-attach the device:
>     /dev/hidraw0 exists (defunct)
>     /dev/hidraw1 exists
> 
> This is with 2.6.35+ from git, revision 3d30701b58970425e1d, updated about 30
> minutes ago.
> 
> Aug 11 11:04:15 ato kernel: [  109.554287] ------------[ cut here
> ]------------
> Aug 11 11:04:15 ato kernel: [  109.554300] WARNING: at lib/kobject.c:595
> kobject_put+0x50/0x60()
> Aug 11 11:04:15 ato kernel: [  109.554306] Hardware name: GA-MA770T-UD3P
> Aug 11 11:04:15 ato kernel: [  109.554311] kobject: '(null)'
> (ffff880244a49898): is not initialized, yet kobject_put() is being called.
> Aug 11 11:04:15 ato kernel: [  109.554317] Modules linked in: usbhid hid
> binfmt_misc fbcon tileblit font bitblit softcursor snd_hda_codec_nvhdmi
> nouveau snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep
> snd_pcm_oss ttm drm_kms_helper snd_mixer_oss snd_pcm drm snd_seq_dummy
> snd_seq_oss snd_seq_midi snd_rawmidi ppdev parport_pc snd_seq_midi_event
> snd_seq psmouse lp snd_timer parport i2c_algo_bit edac_core video edac_mce_amd
> i2c_piix4 snd_seq_device serio_raw snd soundcore snd_page_alloc output
> ohci1394 floppy pata_atiixp ieee1394 ahci libahci r8169 mii
> Aug 11 11:04:15 ato kernel: [  109.554399] Pid: 29, comm: khubd Not tainted
> 2.6.35+ #19
> Aug 11 11:04:15 ato kernel: [  109.554404] Call Trace:
> Aug 11 11:04:15 ato kernel: [  109.554416]  [<ffffffff8105de1f>]
> warn_slowpath_common+0x7f/0xc0
> Aug 11 11:04:15 ato kernel: [  109.554425]  [<ffffffff8105df16>]
> warn_slowpath_fmt+0x46/0x50
> Aug 11 11:04:15 ato kernel: [  109.554434]  [<ffffffff812a47c0>]
> kobject_put+0x50/0x60
> Aug 11 11:04:15 ato kernel: [  109.554442]  [<ffffffff8135c6b7>]
> put_device+0x17/0x20
> Aug 11 11:04:15 ato kernel: [  109.554455]  [<ffffffffa0238998>]
> hid_destroy_device+0x48/0x60 [hid]
> Aug 11 11:04:15 ato kernel: [  109.554466]  [<ffffffffa00f2aeb>]
> usbhid_disconnect+0x2b/0x50 [usbhid]
> Aug 11 11:04:15 ato kernel: [  109.554477]  [<ffffffff813d620a>]
> usb_unbind_interface+0x5a/0x1a0
> Aug 11 11:04:15 ato kernel: [  109.554487]  [<ffffffff81360645>]
> __device_release_driver+0x75/0xe0
> Aug 11 11:04:15 ato kernel: [  109.554495]  [<ffffffff813607ad>]
> device_release_driver+0x2d/0x40
> Aug 11 11:04:15 ato kernel: [  109.554503]  [<ffffffff8135f79e>]
> bus_remove_device+0xae/0xf0
> Aug 11 11:04:15 ato kernel: [  109.554510]  [<ffffffff8135d437>]
> device_del+0x127/0x1d0
> Aug 11 11:04:15 ato kernel: [  109.554519]  [<ffffffff813d2b88>]
> usb_disable_device+0xa8/0x130
> Aug 11 11:04:15 ato kernel: [  109.554527]  [<ffffffff813cbe65>]
> usb_disconnect+0x95/0x130
> Aug 11 11:04:15 ato kernel: [  109.554535]  [<ffffffff813cd51d>]
> hub_thread+0x48d/0x1210
> Aug 11 11:04:15 ato kernel: [  109.554544]  [<ffffffff8105771b>] ?
> dequeue_task_fair+0x8b/0x90
> Aug 11 11:04:15 ato kernel: [  109.554555]  [<ffffffff8107e490>] ?
> autoremove_wake_function+0x0/0x40
> Aug 11 11:04:15 ato kernel: [  109.554563]  [<ffffffff813cd090>] ?
> hub_thread+0x0/0x1210
> Aug 11 11:04:15 ato kernel: [  109.554571]  [<ffffffff8107df36>]
> kthread+0x96/0xa0
> Aug 11 11:04:15 ato kernel: [  109.554580]  [<ffffffff8100be64>]
> kernel_thread_helper+0x4/0x10
> Aug 11 11:04:15 ato kernel: [  109.554588]  [<ffffffff8107dea0>] ?
> kthread+0x0/0xa0
> Aug 11 11:04:15 ato kernel: [  109.554595]  [<ffffffff8100be60>] ?
> kernel_thread_helper+0x0/0x10
> Aug 11 11:04:15 ato kernel: [  109.554601] ---[ end trace 212263bbb326ec69
> ]---
> Aug 11 11:04:21 ato kernel: [  116.450553] usb 1-5.4: new full speed USB
> device using ehci_hcd and address 7
> Aug 11 11:04:22 ato kernel: [  116.576230] generic-usb 0003:04D8:003F.0002:
> hiddev0,hidraw1: USB HID v1.11 Device [Microchip Technology Inc. Simple HID
> Device Demo] on usb-0000:00:12.2-5.4/input0
> Aug 11 11:04:23 ato kernel: [  117.746427] usb 1-5.4: USB disconnect, address
> 7
> Aug 11 11:04:23 ato kernel: [  117.746500] ------------[ cut here
> ]------------
> 
> 
> lan@ato:~/work/linux-2.6$ scripts/ver_linux
> If some fields are empty or look unusual you may have an old version.
> Compare to the current minimal requirements in Documentation/Changes.
> 
> Linux ato 2.6.35+ #19 SMP Wed Aug 11 10:53:49 EDT 2010 x86_64 GNU/Linux
> 
> Gnu C                  4.4.3
> Gnu make               3.81
> binutils               2.20.1
> util-linux             2.17.2
> mount                  support
> module-init-tools      3.11.1
> e2fsprogs              1.41.11
> pcmciautils            014
> Linux C Library        2.11.1
> Dynamic linker (ldd)   2.11.1
> Procps                 3.2.8
> Net-tools              1.60
> Kbd                    1.15
> Sh-utils               7.4
> wireless-tools         30
> Modules Loaded         usbhid hid binfmt_misc fbcon tileblit font bitblit
> softcursor snd_hda_codec_nvhdmi nouveau snd_hda_codec_realtek snd_hda_intel
> snd_hda_codec snd_hwdep snd_pcm_oss ttm drm_kms_helper snd_mixer_oss snd_pcm
> drm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi ppdev parport_pc
> snd_seq_midi_event snd_seq psmouse lp snd_timer parport i2c_algo_bit edac_core
> video edac_mce_amd i2c_piix4 snd_seq_device serio_raw snd soundcore
> snd_page_alloc output ohci1394 floppy pata_atiixp ieee1394 ahci libahci r8169
> mii

This looks very similar to http://lkml.org/lkml/2010/8/10/373

I have not yet root-caused this, but I am not aware of any recent changes 
in usb-hid that might be causing that, so I suspect some change in USB 
core. But will have to investigate.

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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