* [Bluetooth] recursive locking in l2cap_sock_accept/bt_accept_dequeue
@ 2006-09-17 11:36 Pekka Pietikainen
2006-09-17 12:18 ` Marcel Holtmann
0 siblings, 1 reply; 3+ messages in thread
From: Pekka Pietikainen @ 2006-09-17 11:36 UTC (permalink / raw)
To: marcel; +Cc: netdev
Hiya!
Got this from a 2.6.18rc7-based fedora-devel kernel:
=============================================
[ INFO: possible recursive locking detected ]
2.6.17-1.2647.fc6 #1
---------------------------------------------
sdpd/4955 is trying to acquire lock:
(sk_lock-AF_BLUETOOTH){--..}, at: [<f0cea241>] bt_accept_dequeue+0x26/0xc6 [bluetooth]
but task is already holding lock:
(sk_lock-AF_BLUETOOTH){--..}, at: [<f0b90088>] l2cap_sock_accept+0x41/0x11e [l2cap]
other info that might help us debug this:
1 lock held by sdpd/4955:
#0: (sk_lock-AF_BLUETOOTH){--..}, at: [<f0b90088>] l2cap_sock_accept+0x41/0x11e [l2cap]
stack backtrace:
[<c04051ee>] show_trace_log_lvl+0x58/0x171
[<c0405802>] show_trace+0xd/0x10
[<c040591b>] dump_stack+0x19/0x1b
[<c043b9e1>] __lock_acquire+0x778/0x99c
[<c043c176>] lock_acquire+0x4b/0x6d
[<c05b27e3>] lock_sock+0xac/0xbc
[<f0cea241>] bt_accept_dequeue+0x26/0xc6 [bluetooth]
[<f0b90129>] l2cap_sock_accept+0xe2/0x11e [l2cap]
[<c05b1bd7>] sys_accept+0xd8/0x179
[<c05b1d1f>] sys_socketcall+0xa7/0x186
[<c0403faf>] syscall_call+0x7/0xb
DWARF2 unwinder stuck at syscall_call+0x7/0xb
Leftover inexact backtrace:
[<c0405802>] show_trace+0xd/0x10
[<c040591b>] dump_stack+0x19/0x1b
[<c043b9e1>] __lock_acquire+0x778/0x99c
[<c043c176>] lock_acquire+0x4b/0x6d
[<c05b27e3>] lock_sock+0xac/0xbc
[<f0cea241>] bt_accept_dequeue+0x26/0xc6 [bluetooth]
[<f0b90129>] l2cap_sock_accept+0xe2/0x11e [l2cap]
[<c05b1bd7>] sys_accept+0xd8/0x179
[<c05b1d1f>] sys_socketcall+0xa7/0x186
[<c0403faf>] syscall_call+0x7/0xb
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Bluetooth] recursive locking in l2cap_sock_accept/bt_accept_dequeue
2006-09-17 11:36 [Bluetooth] recursive locking in l2cap_sock_accept/bt_accept_dequeue Pekka Pietikainen
@ 2006-09-17 12:18 ` Marcel Holtmann
2006-09-17 18:32 ` Pekka Pietikainen
0 siblings, 1 reply; 3+ messages in thread
From: Marcel Holtmann @ 2006-09-17 12:18 UTC (permalink / raw)
To: Pekka Pietikainen; +Cc: netdev
Hi Pekka,
> Got this from a 2.6.18rc7-based fedora-devel kernel:
>
> =============================================
> [ INFO: possible recursive locking detected ]
> 2.6.17-1.2647.fc6 #1
> ---------------------------------------------
> sdpd/4955 is trying to acquire lock:
> (sk_lock-AF_BLUETOOTH){--..}, at: [<f0cea241>] bt_accept_dequeue+0x26/0xc6 [bluetooth]
>
> but task is already holding lock:
> (sk_lock-AF_BLUETOOTH){--..}, at: [<f0b90088>] l2cap_sock_accept+0x41/0x11e [l2cap]
>
> other info that might help us debug this:
> 1 lock held by sdpd/4955:
> #0: (sk_lock-AF_BLUETOOTH){--..}, at: [<f0b90088>] l2cap_sock_accept+0x41/0x11e [l2cap]
>
> stack backtrace:
> [<c04051ee>] show_trace_log_lvl+0x58/0x171
> [<c0405802>] show_trace+0xd/0x10
> [<c040591b>] dump_stack+0x19/0x1b
> [<c043b9e1>] __lock_acquire+0x778/0x99c
> [<c043c176>] lock_acquire+0x4b/0x6d
> [<c05b27e3>] lock_sock+0xac/0xbc
> [<f0cea241>] bt_accept_dequeue+0x26/0xc6 [bluetooth]
> [<f0b90129>] l2cap_sock_accept+0xe2/0x11e [l2cap]
> [<c05b1bd7>] sys_accept+0xd8/0x179
> [<c05b1d1f>] sys_socketcall+0xa7/0x186
> [<c0403faf>] syscall_call+0x7/0xb
> DWARF2 unwinder stuck at syscall_call+0x7/0xb
> Leftover inexact backtrace:
> [<c0405802>] show_trace+0xd/0x10
> [<c040591b>] dump_stack+0x19/0x1b
> [<c043b9e1>] __lock_acquire+0x778/0x99c
> [<c043c176>] lock_acquire+0x4b/0x6d
> [<c05b27e3>] lock_sock+0xac/0xbc
> [<f0cea241>] bt_accept_dequeue+0x26/0xc6 [bluetooth]
> [<f0b90129>] l2cap_sock_accept+0xe2/0x11e [l2cap]
> [<c05b1bd7>] sys_accept+0xd8/0x179
> [<c05b1d1f>] sys_socketcall+0xa7/0x186
> [<c0403faf>] syscall_call+0x7/0xb
what where you doing when this happened?
Regards
Marcel
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Bluetooth] recursive locking in l2cap_sock_accept/bt_accept_dequeue
2006-09-17 12:18 ` Marcel Holtmann
@ 2006-09-17 18:32 ` Pekka Pietikainen
0 siblings, 0 replies; 3+ messages in thread
From: Pekka Pietikainen @ 2006-09-17 18:32 UTC (permalink / raw)
To: Marcel Holtmann; +Cc: netdev
On Sun, Sep 17, 2006 at 02:18:26PM +0200, Marcel Holtmann wrote:
> Hi Pekka,
>
> > Got this from a 2.6.18rc7-based fedora-devel kernel:
> >
> > =============================================
> > [ INFO: possible recursive locking detected ]
> > 2.6.17-1.2647.fc6 #1
> > sdpd/4955 is trying to acquire lock:
> > (sk_lock-AF_BLUETOOTH){--..}, at: [<f0cea241>] bt_accept_dequeue+0x26/0xc6 [bluetooth]
>
> what where you doing when this happened?
Hiya
Hmn. Plugged my USB BT dongle in, started gnome-obex-server and sent a few
pictures from my cellphone to the box, nothing fancy.. Bluetooth daemons
running obviously at this time...
^ permalink raw reply [flat|nested] 3+ messages in thread
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2006-09-17 11:36 [Bluetooth] recursive locking in l2cap_sock_accept/bt_accept_dequeue Pekka Pietikainen
2006-09-17 12:18 ` Marcel Holtmann
2006-09-17 18:32 ` Pekka Pietikainen
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