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Date: Fri, 1 Nov 2013 14:17:59 +0100 (CET)
From: Fabio Rossi <rossi.f@inwind.it>
Reply-To: Fabio Rossi <rossi.f@inwind.it>
To: linux-wireless@vger.kernel.org, linux-bluetooth@vger.kernel.org
Subject: BUG in rfcomm_sock_getsockopt+0x128/0x200
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I'm using the latest wireless-testing.git and I have found a problem, I get the 
following kernel trace:

BUG: unable to handle kernel paging request at 
00000009dd50350a                                                                                                                     
IP: [<ffffffff815b6768>] 
rfcomm_sock_getsockopt+0x128/0x200                                                                                                                         
PGD 
0                                                                                                                                                                               
Oops: 0000 [#1] SMP 
Modules linked in: vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) fglrx(PO) 
ath5k ath mac80211 cfg80211
CPU: 2 PID: 1475 Comm: bluetoothd Tainted: P           O 3.12.0-rc5-wl #4
Hardware name: System manufacturer System Product Name/P6T DELUXE V2, BIOS 
1202    12/22/2010
task: ffff88032e9ce360 ti: ffff880330654000 task.ti: ffff880330654000
RIP: 0010:[<ffffffff815b6768>]  [<ffffffff815b6768>] 
rfcomm_sock_getsockopt+0x128/0x200
RSP: 0018:ffff880330655ed8  EFLAGS: 00010246
RAX: 00000009dd503502 RBX: 0000000000000003 RCX: 00007fff7b30e298
RDX: 0000000000000003 RSI: 0000000000000012 RDI: ffff8800bad88f00
RBP: ffff880330655f28 R08: 00007fff7b30e29c R09: ffff8803306734d8
R10: 00007fff7b30e298 R11: 0000000000000202 R12: ffff8800ba83ec00
R13: 00007fff7b30e298 R14: 0000000000000003 R15: 00007fff7b30e29c
FS:  00007f31c1d9d700(0000) GS:ffff88033fc80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000009dd50350a CR3: 000000033048a000 CR4: 00000000000007e0
Stack:
 ffff880330655f28 ffffffff815b5e2f ffff880330655f18 0002ffff81107bb6
 0000000600000000 ffff8800bad88f00 0000000000000012 00007fff7b30e298
 0000000000000003 00007fff7b30e29c ffff880330655f78 ffffffff814c6260
Call Trace:
 [<ffffffff815b5e2f>] ? rfcomm_sock_setsockopt+0x5f/0x190
 [<ffffffff814c6260>] SyS_getsockopt+0x60/0xb0
 [<ffffffff815e5ba2>] system_call_fastpath+0x16/0x1b
Code: 02 00 00 00 0f 47 d0 4c 89 ef e8 94 f0 cc ff 83 f8 01 19 c9 f7 d1 83 e1 
f2 e9 4b ff ff ff 0f 1f 44 00 00 49 8b 84 24 70 02 00 00 <4c> 8b 70 08 4c 89 c0 
e8 4c f6 cc ff 85 c0 49 89 d7 b9 f2 ff ff 
RIP  [<ffffffff815b6768>] rfcomm_sock_getsockopt+0x128/0x200
 RSP <ffff880330655ed8>
CR2: 00000009dd50350a
---[ end trace 6e62d73375e99d69 ]---

After bisecting the problem I found the following bad commit:

commit 94a86df01082557e2de45865e538d7fb6c46231c
Author: Marcel Holtmann <marcel@holtmann.org>
Date:   Sun Oct 13 10:34:02 2013 -0700

    Bluetooth: Store RFCOMM address information in its own socket structure
    
    The address information of RFCOMM sockets should be stored in its
    own socket structure. Trying to generalize them is not helpful since
    different transports have different address types.
    
    Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
    Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

Fabio