new message from apport-gtk:
BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff8159c882>] __mutex_lock_slowpath+0xd2/0x190 Call Trace: [<ffffffff812b869b>] ? cpumask_any_but+0x2b/0x40 [<ffffffff8159c2a3>] mutex_lock+0x23/0x50 [<ffffffff81365349>] fb_release+0x29/0x70 [<ffffffff8115340f>] __fput+0xdf/0x1f0 [<ffffffff81153545>] fput+0x25/0x30 [<ffffffff8114fafd>] filp_close+0x5d/0x90 [<ffffffff8114fbe7>] sys_close+0xb7/0x120 [<ffffffff8100a0f2>] system_call_fastpath+0x16/0x1b Code: 00 4c 8d 6b 04 4c 8d 7b 08 41 be ff ff ff ff 4c 89 ef e8 a2 11 00 00 48 8b 43 10 48 8d 55 b0 48 89 53 10 4c 89 7d b0 48 89 45 b8 <48> 89 10 44 89 f0 4c 89 65 c0 87 03 83 f8 01 75 24 eb 2c 0f 1f
new message from apport-gtk:
BUG: unable to handle kernel NULL pointer dereference at (null) 882>] __mutex_ lock_slowpath+ 0xd2/0x190 869b>] ? cpumask_ any_but+ 0x2b/0x40 c2a3>] mutex_lock+ 0x23/0x50 5349>] fb_release+ 0x29/0x70 340f>] __fput+0xdf/0x1f0 3545>] fput+0x25/0x30 fafd>] filp_close+ 0x5d/0x90 fbe7>] sys_close+ 0xb7/0x120 a0f2>] system_ call_fastpath+ 0x16/0x1b
IP: [<ffffffff8159c
Call Trace:
[<ffffffff812b
[<ffffffff8159
[<ffffffff8136
[<ffffffff8115
[<ffffffff8115
[<ffffffff8114
[<ffffffff8114
[<ffffffff8100
Code: 00 4c 8d 6b 04 4c 8d 7b 08 41 be ff ff ff ff 4c 89 ef e8 a2 11 00 00 48 8b 43 10 48 8d 55 b0 48 89 53 10 4c 89 7d b0 48 89 45 b8 <48> 89 10 44 89 f0 4c 89 65 c0 87 03 83 f8 01 75 24 eb 2c 0f 1f