reproducible with 3.13.0-40-generic
Ubuntu 3.13.0-40.69~precise1-generic 3.13.11.10

Dec  5 16:49:56 ubuntu kernel: [   21.340139] [drm] AST 2300 detected
Dec  5 16:49:56 ubuntu kernel: [   21.340183] [drm] dram 1632000000 1 16 
00800000
Dec  5 16:49:56 ubuntu kernel: [   21.340211] [TTM] Zone  kernel: Available 
graphics memory: 65964816 kiB
Dec  5 16:49:56 ubuntu kernel: [   21.340211] [TTM] Zone   dma32: Available 
graphics memory: 2097152 kiB
Dec  5 16:49:56 ubuntu kernel: [   21.340212] [TTM] Initializing pool allocator
Dec  5 16:49:56 ubuntu kernel: [   21.340214] [TTM] Initializing DMA pool 
allocator
Dec  5 16:49:56 ubuntu kernel: [   21.354338] checking generic (c7000000 
130000) vs hw (c7000000 800000)
Dec  5 16:49:56 ubuntu kernel: [   21.354339] fb: conflicting fb hw usage 
astdrmfb vs VESA VGA - removing generic driver
Dec  5 16:49:56 ubuntu kernel: [   21.394467] Console: switching to colour 
dummy device 80x25
Dec  5 16:49:56 ubuntu kernel: [   21.394513] BUG: unable to handle kernel NULL 
pointer dereference at 0000000000000138
Dec  5 16:49:56 ubuntu kernel: [   21.394517] IP: [<ffffffff8147abd4>] 
con_set_unimap+0x34/0x2a0
Dec  5 16:49:56 ubuntu kernel: [   21.394518] PGD 10267e2067 PUD 1025232067 PMD 
0 
Dec  5 16:49:56 ubuntu kernel: [   21.394519] Oops: 0000 [#1] SMP 
Dec  5 16:49:56 ubuntu kernel: [   21.394527] Modules linked in: ast(+) ttm 
drm_kms_helper drm gpio_ich sysimgblt sysfillrect syscopyarea shpchp lpc_ich 
wmi joydev ipmi_si parport_pc ppdev mac_hid acpi_pad lp parport hid_generic 
usbhid hid mpt2sas igb dca ahci scsi_transport_sas i2c_algo_bit raid_class ptp 
libahci pps_core
Dec  5 16:49:56 ubuntu kernel: [   21.394528] CPU: 4 PID: 1649 Comm: setfont 
Not tainted 3.13.0-40-generic #69~precise1-Ubuntu
Dec  5 16:49:56 ubuntu kernel: [   21.394529] Hardware name: Quanta Computer 
Inc T41S-2U/S2S, BIOS S2S_3A14          09/19/2014
Dec  5 16:49:56 ubuntu kernel: [   21.394529] task: ffff88202467c800 ti: 
ffff8820270da000 task.ti: ffff8820270da000
Dec  5 16:49:56 ubuntu kernel: [   21.394531] RIP: 0010:[<ffffffff8147abd4>]  
[<ffffffff8147abd4>] con_set_unimap+0x34/0x2a0
Dec  5 16:49:56 ubuntu kernel: [   21.394531] RSP: 0018:ffff8820270dbd18  
EFLAGS: 00010246
Dec  5 16:49:56 ubuntu kernel: [   21.394532] RAX: ffff8820262a8308 RBX: 
0000000000004b67 RCX: 0000000000000000
Dec  5 16:49:56 ubuntu kernel: [   21.394532] RDX: ffff8820262a8000 RSI: 
0000000000000296 RDI: 0000000000000000
Dec  5 16:49:56 ubuntu kernel: [   21.394533] RBP: ffff8820270dbd98 R08: 
ffff8820270da000 R09: 0000000000000001
Dec  5 16:49:56 ubuntu kernel: [   21.394533] R10: 0000000000000020 R11: 
0000000000000000 R12: 00000000ffffffff
Dec  5 16:49:56 ubuntu kernel: [   21.394533] R13: 00000000021f9b10 R14: 
0000000000000001 R15: 0000000000000000
Dec  5 16:49:56 ubuntu kernel: [   21.394534] FS:  00007f9209142700(0000) 
GS:ffff88103fc80000(0000) knlGS:0000000000000000
Dec  5 16:49:56 ubuntu kernel: [   21.394534] CS:  0010 DS: 0000 ES: 0000 CR0: 
0000000080050033
Dec  5 16:49:56 ubuntu kernel: [   21.394535] CR2: 0000000000000138 CR3: 
000000101f230000 CR4: 00000000001407e0
Dec  5 16:49:56 ubuntu kernel: [   21.394535] Stack:
Dec  5 16:49:56 ubuntu kernel: [   21.394537]  0000000000000286 
0000000000000000 ffff8820270dbd58 ffffffff8132657b
Dec  5 16:49:56 ubuntu kernel: [   21.394539]  ffff88202467c800 
00000000fffffdfd ffff8820262a8000 0000000000000001
Dec  5 16:49:56 ubuntu kernel: [   21.394540]  02e18820270dbd68 
ffff8820262a8000 ffff8820270dbd88 0000000000004b67
Dec  5 16:49:56 ubuntu kernel: [   21.394540] Call Trace:
Dec  5 16:49:56 ubuntu kernel: [   21.394545]  [<ffffffff8132657b>] ? 
apparmor_capable+0x2b/0x110
Dec  5 16:49:56 ubuntu kernel: [   21.394547]  [<ffffffff8147485d>] 
vt_ioctl+0xfdd/0x11d0
Dec  5 16:49:56 ubuntu kernel: [   21.394551]  [<ffffffff81184f83>] ? 
handle_mm_fault+0xb3/0x160
Dec  5 16:49:56 ubuntu kernel: [   21.394554]  [<ffffffff81467e98>] 
tty_ioctl+0x298/0x8f0
Dec  5 16:49:56 ubuntu kernel: [   21.394556]  [<ffffffff811894c0>] ? 
remove_vma+0x80/0xb0
Dec  5 16:49:56 ubuntu kernel: [   21.394558]  [<ffffffff811dd415>] 
do_vfs_ioctl+0x75/0x2c0
Dec  5 16:49:56 ubuntu kernel: [   21.394559]  [<ffffffff811dd6f1>] 
SyS_ioctl+0x91/0xb0
Dec  5 16:49:56 ubuntu kernel: [   21.394560]  [<ffffffff8118b839>] ? 
vm_munmap+0x59/0x70
Dec  5 16:49:56 ubuntu kernel: [   21.394563]  [<ffffffff8176bcad>] 
system_call_fastpath+0x1a/0x1f

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https://bugs.launchpad.net/bugs/1296660

Title:
  Kernel oops: fb: conflicting fb hw usage astdrmfb vs VESA VGA (unable
  to handle kernel NULL pointer dereference / con_set_unimap+0x32

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