It's a reproducible bug.
When creating a ppp dialup connection a second time there is a lockdep annotation:
[ 1477.716936] PPP generic driver version 2.4.2
[ 1477.738035] BUG: sleeping function called from invalid context at
mm/slub.c:1719
[ 1477.738046] in_atomic(): 1, irqs_disabled(): 0, pid: 5057, name: pppd
[ 1477.738053] 3 locks held by pppd/5057:
[ 1477.738058] #0: (rfcomm_mutex){+.+.+.}, at: [<fa5dd2a1>]
rfcomm_dlc_open+0x28/0x2d6 [rfcomm]
[ 1477.738083] #1: (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.+.}, at:
[<fa53f4f8>] l2cap_sock_connect+0x62/0x2c6 [l2cap]
[ 1477.738105] #2: (&hdev->lock){+...+.}, at: [<fa53f5b4>]
l2cap_sock_connect+0x11e/0x2c6 [l2cap]
[ 1477.738129] Pid: 5057, comm: pppd Not tainted 2.6.31-08939-gdb8abec-dirty #21
[ 1477.738135] Call Trace:
[ 1477.738148] [<c1042a2b>] ? __debug_show_held_locks+0x1e/0x20
[ 1477.738160] [<c10212a1>] __might_sleep+0xc9/0xce
[ 1477.738171] [<c1078b62>] __kmalloc+0x6d/0xfb
[ 1477.738181] [<c119e739>] ? kzalloc+0xb/0xd
[ 1477.738190] [<c119e739>] kzalloc+0xb/0xd
[ 1477.738199] [<c119ef1a>] device_private_init+0x15/0x3d
[ 1477.738209] [<c11a0e1b>] dev_set_drvdata+0x18/0x26
[ 1477.738233] [<f88f9a1b>] hci_conn_init_sysfs+0x3d/0xc7 [bluetooth]
[ 1477.738253] [<f88f61b3>] hci_conn_add+0x1c0/0x1d5 [bluetooth]
[ 1477.738271] [<f88f6360>] hci_connect+0x71/0x17d [bluetooth]
[ 1477.738285] [<fa53f62c>] l2cap_sock_connect+0x196/0x2c6 [l2cap]
[ 1477.738298] [<c1246e3d>] kernel_connect+0xd/0x12
[ 1477.738311] [<fa5dd3c3>] rfcomm_dlc_open+0x14a/0x2d6 [rfcomm]
[ 1477.738326] [<fa5df0fa>] ? rfcomm_tty_open+0x73/0x227 [rfcomm]
[ 1477.738341] [<fa5df130>] rfcomm_tty_open+0xa9/0x227 [rfcomm]
[ 1477.738352] [<c1022e3f>] ? default_wake_function+0x0/0xd
[ 1477.738363] [<c1180c79>] tty_open+0x29e/0x399
[ 1477.738374] [<c107e9bd>] chrdev_open+0x13f/0x156
[ 1477.738384] [<c107b0d3>] __dentry_open+0x11b/0x20f
[ 1477.738394] [<c107b261>] nameidata_to_filp+0x2c/0x43
[ 1477.738403] [<c107e87e>] ? chrdev_open+0x0/0x156
[ 1477.738414] [<c1084e9e>] do_filp_open+0x3c6/0x70a
[ 1477.738426] [<c108d3e4>] ? alloc_fd+0xc8/0xd2
[ 1477.738436] [<c108d3e4>] ? alloc_fd+0xc8/0xd2
[ 1477.738446] [<c107aebc>] do_sys_open+0x4a/0xe7
[ 1477.738456] [<c1002acc>] ? restore_all_notrace+0x0/0x18
[ 1477.738466] [<c107af9b>] sys_open+0x1e/0x26
[ 1477.738475] [<c1002a18>] sysenter_do_call+0x12/0x36
[ 1484.844933] PPP BSD Compression module registered
[ 1484.870946] PPP Deflate Compression module registered
[ 4335.008503] CE: hpet increasing min_delta_ns to 15000 nsec
[ 7605.540870] INFO: trying to register non-static key.
[ 7605.540879] the code is fine but needs lockdep annotation.
[ 7605.540884] turning off the locking correctness validator.
[ 7605.540894] Pid: 0, comm: swapper Not tainted 2.6.31-08939-gdb8abec-dirty #21
[ 7605.540900] Call Trace:
[ 7605.540915] [<c12e4fb2>] ? printk+0xf/0x11
[ 7605.540928] [<c1042214>] register_lock_class+0x5a/0x295
[ 7605.540939] [<c1043af2>] __lock_acquire+0x9b/0xc03
[ 7605.540949] [<c104464b>] ? __lock_acquire+0xbf4/0xc03
[ 7605.540967] [<fa53b168>] ? l2cap_get_chan_by_scid+0x35/0x43 [l2cap]
[ 7605.540977] [<c104491f>] ? lock_release_non_nested+0x17b/0x1db
[ 7605.540990] [<fa53b168>] ? l2cap_get_chan_by_scid+0x35/0x43 [l2cap]
[ 7605.541001] [<c10426fd>] ? trace_hardirqs_off+0xb/0xd
[ 7605.541010] [<c10446b6>] lock_acquire+0x5c/0x73
[ 7605.541021] [<c124cd14>] ? skb_dequeue+0x12/0x4c
[ 7605.541031] [<c12e6e23>] _spin_lock_irqsave+0x24/0x34
[ 7605.541039] [<c124cd14>] ? skb_dequeue+0x12/0x4c
[ 7605.541048] [<c124cd14>] skb_dequeue+0x12/0x4c
[ 7605.541057] [<c124d579>] skb_queue_purge+0x14/0x1b
[ 7605.541070] [<fa53de3f>] l2cap_recv_frame+0xe9e/0x129a [l2cap]
[ 7605.541080] [<c10421d1>] ? register_lock_class+0x17/0x295
[ 7605.541091] [<c104464b>] ? __lock_acquire+0xbf4/0xc03
[ 7605.541114] [<c104464b>] ? __lock_acquire+0xbf4/0xc03
[ 7605.541125] [<c120de74>] ? uhci_giveback_urb+0xf2/0x162
[ 7605.541148] [<f88f4c45>] ? hci_rx_task+0xfe/0x1f8 [bluetooth]
[ 7605.541162] [<fa53e2e4>] l2cap_recv_acldata+0xa9/0x1be [l2cap]
[ 7605.541174] [<fa53e23b>] ? l2cap_recv_acldata+0x0/0x1be [l2cap]
[ 7605.541193] [<f88f4c77>] hci_rx_task+0x130/0x1f8 [bluetooth]
[ 7605.541204] [<c102a098>] tasklet_action+0x6b/0xb2
[ 7605.541213] [<c102a46b>] __do_softirq+0x82/0x101
[ 7605.541222] [<c102a515>] do_softirq+0x2b/0x43
[ 7605.541231] [<c102a619>] irq_exit+0x35/0x68
[ 7605.541241] [<c1004513>] do_IRQ+0x80/0x96
[ 7605.541250] [<c10030ae>] common_interrupt+0x2e/0x34
[ 7605.541260] [<c104007b>] ? tick_device_uses_broadcast+0x71/0x7c
[ 7605.541271] [<c11747a8>] ? acpi_idle_enter_simple+0x103/0x12e
[ 7605.541281] [<c1174515>] acpi_idle_enter_bm+0xc3/0x253
[ 7605.541291] [<c1238b6f>] cpuidle_idle_call+0x60/0x91
[ 7605.541300] [<c1001d44>] cpu_idle+0x49/0x65
[ 7605.541310] [<c12e2f0e>] start_secondary+0x190/0x195
Oliver Hartkopp wrote:
> Hello Marcel,
>
> with current net-2.6 tree ...
>
> While starting my PPP Bluetooth dialup networking, i got this:
>
> [ 722.461549] PPP generic driver version 2.4.2
> [ 722.477519] BUG: sleeping function called from invalid context at
> mm/slub.c:1719
> [ 722.477530] in_atomic(): 1, irqs_disabled(): 0, pid: 4677, name: pppd
> [ 722.477537] 3 locks held by pppd/4677:
> [ 722.477542] #0: (rfcomm_mutex){+.+.+.}, at: [<fa5df2a1>]
> rfcomm_dlc_open+0x28/0x2d6 [rfcomm]
> [ 722.477568] #1: (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.+.}, at:
> [<fa5414f8>] l2cap_sock_connect+0x62/0x2c6 [l2cap]
> [ 722.477589] #2: (&hdev->lock){+...+.}, at: [<fa5415b4>]
> l2cap_sock_connect+0x11e/0x2c6 [l2cap]
> [ 722.477613] Pid: 4677, comm: pppd Not tainted 2.6.31-08939-gdb8abec-dirty #21
> [ 722.477619] Call Trace:
> [ 722.477633] [<c1042a2b>] ? __debug_show_held_locks+0x1e/0x20
> [ 722.477644] [<c10212a1>] __might_sleep+0xc9/0xce
> [ 722.477655] [<c1078b62>] __kmalloc+0x6d/0xfb
> [ 722.477666] [<c119e739>] ? kzalloc+0xb/0xd
> [ 722.477674] [<c119e739>] kzalloc+0xb/0xd
> [ 722.477683] [<c119ef1a>] device_private_init+0x15/0x3d
> [ 722.477693] [<c11a0e1b>] dev_set_drvdata+0x18/0x26
> [ 722.477718] [<f8b7ca1b>] hci_conn_init_sysfs+0x3d/0xc7 [bluetooth]
> [ 722.477737] [<f8b791b3>] hci_conn_add+0x1c0/0x1d5 [bluetooth]
> [ 722.477756] [<f8b79360>] hci_connect+0x71/0x17d [bluetooth]
> [ 722.477769] [<fa54162c>] l2cap_sock_connect+0x196/0x2c6 [l2cap]
> [ 722.477782] [<c1246e3d>] kernel_connect+0xd/0x12
> [ 722.477795] [<fa5df3c3>] rfcomm_dlc_open+0x14a/0x2d6 [rfcomm]
> [ 722.477810] [<fa5e10fa>] ? rfcomm_tty_open+0x73/0x227 [rfcomm]
> [ 722.477825] [<fa5e1130>] rfcomm_tty_open+0xa9/0x227 [rfcomm]
> [ 722.477836] [<c1022e3f>] ? default_wake_function+0x0/0xd
> [ 722.477847] [<c1180c79>] tty_open+0x29e/0x399
> [ 722.477858] [<c107e9bd>] chrdev_open+0x13f/0x156
> [ 722.477868] [<c107b0d3>] __dentry_open+0x11b/0x20f
> [ 722.477878] [<c107b261>] nameidata_to_filp+0x2c/0x43
> [ 722.477888] [<c107e87e>] ? chrdev_open+0x0/0x156
> [ 722.477898] [<c1084e9e>] do_filp_open+0x3c6/0x70a
> [ 722.477910] [<c108d3e4>] ? alloc_fd+0xc8/0xd2
> [ 722.477920] [<c108d3e4>] ? alloc_fd+0xc8/0xd2
> [ 722.477930] [<c107aebc>] do_sys_open+0x4a/0xe7
> [ 722.477940] [<c1002acc>] ? restore_all_notrace+0x0/0x18
> [ 722.477950] [<c107af9b>] sys_open+0x1e/0x26
> [ 722.477959] [<c1002a18>] sysenter_do_call+0x12/0x36
> [ 729.658613] PPP BSD Compression module registered
> [ 729.684789] PPP Deflate Compression module registered
>
> Any idea?
>
> Regards,
> Oliver
>
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