[Bluez-devel] recursive locking on pairing: 2.6.18-rc4

[Bluez-devel] recursive locking on pairing: 2.6.18-rc4

[sean]

I'm trying to pair my nokia 770 with my desktop which is 
running fc6t2, kernel-2.6.18-rc4. bluez-libs-3.0. Using a 
zonet usb dongle.

The 770 returns a "no services" message. On the desktop, 
/var/log/messages:

Aug 22 15:41:57 localhost hcid[24880]: pin_code_request 
(sba=00:02:72:C4:26:F1, dba=00:12:37:46:DB:31)
Aug 22 15:41:57 localhost hcid[24880]: link_key_notify 
(sba=00:02:72:C4:26:F1, dba=00:12:37:46:DB:31)
Aug 22 15:41:59 localhost kernel:
Aug 22 15:41:59 localhost kernel: 
=============================================
Aug 22 15:41:59 localhost kernel: [ INFO: possible recursive 
locking detected ]
Aug 22 15:41:59 localhost kernel: 2.6.17-1.2573.fc6 #1
Aug 22 15:41:59 localhost kernel: 
---------------------------------------------
Aug 22 15:41:59 localhost kernel: sdpd/24884 is trying to 
acquire lock:
Aug 22 15:41:59 localhost kernel: 
(sk_lock-AF_BLUETOOTH){--..}, at: [<ffffffff885622b8>] 
bt_accept_dequeue+0x37/0xfa [bluetooth]
Aug 22 15:41:59 localhost kernel:
Aug 22 15:41:59 localhost kernel: but task is already 
holding lock:
Aug 22 15:41:59 localhost kernel: 
(sk_lock-AF_BLUETOOTH){--..}, at: [<ffffffff88584464>] 
l2cap_sock_accept+0x52/0x162 [l2cap]
Aug 22 15:41:59 localhost kernel:
Aug 22 15:41:59 localhost kernel: other info that might help 
us debug this:
Aug 22 15:41:59 localhost kernel: 1 lock held by sdpd/24884:
Aug 22 15:41:59 localhost kernel:  #0: 
(sk_lock-AF_BLUETOOTH){--..}, at: [<ffffffff88584464>] 
l2cap_sock_accept+0x52/0x162 [l2cap]
Aug 22 15:41:59 localhost kernel:
Aug 22 15:41:59 localhost kernel: stack backtrace:
Aug 22 15:41:59 localhost kernel:
Aug 22 15:41:59 localhost kernel: Call Trace:
Aug 22 15:41:59 localhost kernel:  [<ffffffff8026e8fd>] 
show_trace+0xae/0x319
Aug 22 15:41:59 localhost kernel:  [<ffffffff8026eb7d>] 
dump_stack+0x15/0x17
Aug 22 15:41:59 localhost kernel:  [<ffffffff802a8278>] 
__lock_acquire+0x135/0xa64
Aug 22 15:41:59 localhost kernel:  [<ffffffff802a914a>] 
lock_acquire+0x4b/0x69
Aug 22 15:41:59 localhost kernel:  [<ffffffff802360ca>] 
lock_sock+0xd5/0xe7
Aug 22 15:41:59 localhost kernel:  [<ffffffff885622b8>] 
:bluetooth:bt_accept_dequeue+0x37/0xfa
Aug 22 15:41:59 localhost kernel:  [<ffffffff88584528>] 
:l2cap:l2cap_sock_accept+0x116/0x162
Aug 22 15:41:59 localhost kernel:  [<ffffffff8041f9cd>] 
sys_accept+0x102/0x1af
Aug 22 15:41:59 localhost kernel:  [<ffffffff8026058e>] 
system_call+0x7e/0x83
Aug 22 15:41:59 localhost kernel: DWARF2 unwinder stuck at 
system_call+0x7e/0x83
Aug 22 15:41:59 localhost kernel: Leftover inexact backtrace:
Aug 22 15:41:59 localhost kernel:

sean


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Re: [Bluez-devel] recursive locking on pairing: 2.6.18-rc4

[Johan Hedberg]

Hi sean,

On Tue, Aug 22, 2006, sean wrote:
> I'm trying to pair my nokia 770 with my desktop which is 
> running fc6t2, kernel-2.6.18-rc4. bluez-libs-3.0. Using a 
> zonet usb dongle.
> 
> The 770 returns a "no services" message. On the desktop, 
> /var/log/messages:

I can't say anything about the desktop side problems, but the reason you 
get "no services" is that the 770 will only pair with devices that have 
either a Dial-up Networking (DUN) or OBEX File Transfer profile service 
records (or both) in its SDP server. So if you e.g. do a "sdptool add 
DUN" and "sdptool add FTP" on the desktop side you shouldn't get that 
error message.

Johan

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Re: [Bluez-devel] recursive locking on pairing: 2.6.18-rc4

[sean]

Johan Hedberg wrote:
> Hi sean,
> 
> On Tue, Aug 22, 2006, sean wrote:
> 
>>I'm trying to pair my nokia 770 with my desktop which is 
>>running fc6t2, kernel-2.6.18-rc4. bluez-libs-3.0. Using a 
>>zonet usb dongle.
>>
>>The 770 returns a "no services" message. On the desktop, 
>>/var/log/messages:
> 
> 
> I can't say anything about the desktop side problems, but the reason you 
> get "no services" is that the 770 will only pair with devices that have 
> either a Dial-up Networking (DUN) or OBEX File Transfer profile service 
> records (or both) in its SDP server. So if you e.g. do a "sdptool add 
> DUN" and "sdptool add FTP" on the desktop side you shouldn't get that 
> error message.
> 
> Johan
> 

That was it. Once I sdptool add FTP , pairing succeeded, 
without any kernel error messages.

sean


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