Re: USB Disconnect BUG with RT Kernels (linux-2.6.23-rt1)

Re: USB Disconnect BUG with RT Kernels (linux-2.6.23-rt1)

[Jiri Kosina]

On Mon, 22 Oct 2007, Esben Stien wrote:

>  [<c0319a64>] input_unregister_device+0x67/0xfc
>  [<c032a139>] hidinput_disconnect+0x2e/0x47
>  [<c032d697>] hid_disconnect+0x76/0xce
>  [<c02fd799>] usb_unbind_interface+0x2d/0x6e
>  [<c02b7ba4>] __device_release_driver+0x71/0x8e
>  [<c02b7c65>] device_release_driver+0x18/0x21
>  [<c02b76f3>] bus_remove_device+0x70/0x80
>  [<c02b5ddf>] device_del+0x1bb/0x22f
>  [<c02fb4f1>] usb_disable_device+0x5c/0xbb
>  [<c02f807d>] usb_disconnect+0x7a/0xd3
>  [<c02f85a9>] hub_thread+0x30f/0x9ea
>  [<c010d79a>] update_stats_wait_end+0x9b/0xbe
>  [<c03c4c32>] __schedule+0x27e/0x36d
>  [<c01214e5>] autoremove_wake_function+0x0/0x35
>  [<c02f829a>] hub_thread+0x0/0x9ea
>  [<c012142e>] kthread+0x36/0x5c
>  [<c01213f8>] kthread+0x0/0x5c
>  [<c0102913>] kernel_thread_helper+0x7/0x10
>  =======================
> Code: e8 3c c5 ff ff 8b 5e 64 eb 1b 8d 83 08 04 00 00 b9 06 00 02 00 ba 1d 00 00 00 e8 d7 fc e3 ff 8b 9b 10 04 00 00 81 eb 10 04 00 00 <8b> 83 10 04 00 00 0f 18 00 90 8d 93 10 04 00 00 8d 46 64 39 c2 
> EIP: [<c031c3d9>] evdev_disconnect+0x5b/0x96 SS:ESP 0068:c1e07e84

Please try the latest git. Dmitry has pushed patches that implement proper 
locking in input layer, which are very likely going to fix the bug you are 
seeing.

Namely commits 8006479, 6addb1d and 464b241, so please try to reproduce 
with any kernel that has them.

Thanks,

-- 
Jiri Kosina

USB Disconnect BUG with RT Kernels (linux-2.6.23-rt1)

[Esben Stien]

I also saw this in 2.6.22-rt9. When I disconnect a USB device the
whole USB system goes down and I'm not able to insert any other USB
device until I reboot.

This happens every time. I'm on a P4.

usb 1-1.3: USB disconnect, address 11
BUG: unable to handle kernel paging request at virtual address 00100100
 printing eip:
c031c3d9
*pde = 00000000
stopped custom tracer.
Oops: 0000 [#1]
PREEMPT 
Modules linked in: snd_seq_midi snd_rtctimer rtc radeon snd_hdsp snd_rawmidi firmware_class snd_hwdep
CPU:    0
EIP:    0060:[<c031c3d9>]    Not tainted VLI
EFLAGS: 00010206   (2.6.23-rt1 #1)
EIP is at evdev_disconnect+0x5b/0x96
eax: 00000000   ebx: 000ffcf0   ecx: 00000073   edx: c1e03450
esi: f7540000   edi: f754006c   ebp: f7bb9800   esp: c1e07e84
ds: 007b   es: 007b   fs: 0000  gs: 0000  ss: 0068  preempt:00000001
Process khubd (pid: 82, ti=c1e06000 task=c1e03450 task.ti=c1e06000)
Stack: f7f1d400 f7ea4000 f7ea47f4 f7ea7000 c0319a64 00000000 f7ea6000 f7ea7000 
       f7bb9800 f6ac3b00 f7ea7c58 c032a139 f7ea601c f7ea6000 f7ea7000 c032d697 
       f7bb9800 f7bb981c c04afd40 f66f3858 c02fd799 f7bb981c c04afd88 00000000 
Call Trace:
 [<c0319a64>] input_unregister_device+0x67/0xfc
 [<c032a139>] hidinput_disconnect+0x2e/0x47
 [<c032d697>] hid_disconnect+0x76/0xce
 [<c02fd799>] usb_unbind_interface+0x2d/0x6e
 [<c02b7ba4>] __device_release_driver+0x71/0x8e
 [<c02b7c65>] device_release_driver+0x18/0x21
 [<c02b76f3>] bus_remove_device+0x70/0x80
 [<c02b5ddf>] device_del+0x1bb/0x22f
 [<c02fb4f1>] usb_disable_device+0x5c/0xbb
 [<c02f807d>] usb_disconnect+0x7a/0xd3
 [<c02f85a9>] hub_thread+0x30f/0x9ea
 [<c010d79a>] update_stats_wait_end+0x9b/0xbe
 [<c03c4c32>] __schedule+0x27e/0x36d
 [<c01214e5>] autoremove_wake_function+0x0/0x35
 [<c02f829a>] hub_thread+0x0/0x9ea
 [<c012142e>] kthread+0x36/0x5c
 [<c01213f8>] kthread+0x0/0x5c
 [<c0102913>] kernel_thread_helper+0x7/0x10
 =======================
Code: e8 3c c5 ff ff 8b 5e 64 eb 1b 8d 83 08 04 00 00 b9 06 00 02 00 ba 1d 00 00 00 e8 d7 fc e3 ff 8b 9b 10 04 00 00 81 eb 10 04 00 00 <8b> 83 10 04 00 00 0f 18 00 90 8d 93 10 04 00 00 8d 46 64 39 c2 
EIP: [<c031c3d9>] evdev_disconnect+0x5b/0x96 SS:ESP 0068:c1e07e84

-- 
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