Subject: Re: [BUG net-2.6] bluetooth/rfcomm : sleeping function called from invalid context at mm/slub.c:1719

From: Oliver Hartkopp <[email-masked]>
Date: Fri, 02 Oct 2009 18:04:14 +0200

Dave Young wrote:
> On Fri, Oct 2, 2009 at 2:28 PM, Oliver Hartkopp <[email-masked]> wrote:
>> Hello Marcel,
>>
>> with current net-2.6 tree ...
>>
>> While starting my PPP Bluetooth dialup networking, i got this:
> 
> Hi, oliver
> 
> please try following patch:
> http://patchwork.kernel.org/patch/51326/

Hi Dave,

that fixed it at ppp startup!

Tested-by: Oliver Hartkopp <[email-masked]>

Btw. when shutting down the ppp connection i still get this:

[  361.996887] INFO: trying to register non-static key.
[  361.996897] the code is fine but needs lockdep annotation.
[  361.996902] turning off the locking correctness validator.
[  361.996912] Pid: 0, comm: swapper Not tainted 2.6.31-08939-gdb8abec-dirty #22
[  361.996919] Call Trace:
[  361.996933]  [<c12e4fb2>] ? printk+0xf/0x11
[  361.996947]  [<c1042214>] register_lock_class+0x5a/0x295
[  361.996957]  [<c1043af2>] __lock_acquire+0x9b/0xc03
[  361.996967]  [<c104464b>] ? __lock_acquire+0xbf4/0xc03
[  361.996985]  [<fa59a168>] ? l2cap_get_chan_by_scid+0x35/0x43 [l2cap]
[  361.996995]  [<c104491f>] ? lock_release_non_nested+0x17b/0x1db
[  361.997008]  [<fa59a168>] ? l2cap_get_chan_by_scid+0x35/0x43 [l2cap]
[  361.997018]  [<c10426fd>] ? trace_hardirqs_off+0xb/0xd
[  361.997028]  [<c10446b6>] lock_acquire+0x5c/0x73
[  361.997039]  [<c124cd14>] ? skb_dequeue+0x12/0x4c
[  361.997049]  [<c12e6e23>] _spin_lock_irqsave+0x24/0x34
[  361.997058]  [<c124cd14>] ? skb_dequeue+0x12/0x4c
[  361.997066]  [<c124cd14>] skb_dequeue+0x12/0x4c
[  361.997075]  [<c124d579>] skb_queue_purge+0x14/0x1b
[  361.997088]  [<fa59ce3f>] l2cap_recv_frame+0xe9e/0x129a [l2cap]
[  361.997099]  [<c10421d1>] ? register_lock_class+0x17/0x295
[  361.997110]  [<c104464b>] ? __lock_acquire+0xbf4/0xc03
[  361.997128]  [<c104464b>] ? __lock_acquire+0xbf4/0xc03
[  361.997139]  [<c120de74>] ? uhci_giveback_urb+0xf2/0x162
[  361.997163]  [<f8bb4c45>] ? hci_rx_task+0xfe/0x1f8 [bluetooth]
[  361.997177]  [<fa59d2e4>] l2cap_recv_acldata+0xa9/0x1be [l2cap]
[  361.997190]  [<fa59d23b>] ? l2cap_recv_acldata+0x0/0x1be [l2cap]
[  361.997208]  [<f8bb4c77>] hci_rx_task+0x130/0x1f8 [bluetooth]
[  361.997219]  [<c102a098>] tasklet_action+0x6b/0xb2
[  361.997228]  [<c102a46b>] __do_softirq+0x82/0x101
[  361.997237]  [<c102a515>] do_softirq+0x2b/0x43
[  361.997246]  [<c102a619>] irq_exit+0x35/0x68
[  361.997256]  [<c1004513>] do_IRQ+0x80/0x96
[  361.997265]  [<c10030ae>] common_interrupt+0x2e/0x34
[  361.997275]  [<c104007b>] ? tick_device_uses_broadcast+0x71/0x7c
[  361.997286]  [<c11747a8>] ? acpi_idle_enter_simple+0x103/0x12e
[  361.997296]  [<c1174515>] acpi_idle_enter_bm+0xc3/0x253
[  361.997306]  [<c1238b6f>] cpuidle_idle_call+0x60/0x91
[  361.997315]  [<c1001d44>] cpu_idle+0x49/0x65
[  361.997324]  [<c12e2f0e>] start_secondary+0x190/0x195

Thanks,
Oliver