Xorg freeze - general protection fault with fglrx on 4.2 kernel

X won't start with fglrx or fglrx-updates on Wily.

[ 27.388442] fglrx: module license 'Proprietary. (C) 2002 - ATI Technologies, Starnberg, GERMANY' taints kernel.
[ 27.388449] Disabling lock debugging due to kernel taint
[ 27.416878] fglrx: module verification failed: signature and/or required key missing - tainting kernel
[ 27.460461] <6>[fglrx] Maximum main memory to use for locked dma buffers: 3790 MBytes.
[ 27.460701] <6>[fglrx] vendor: 1002 device: 679a revision: 0 count: 1
[ 27.461101] <6>[fglrx] ioport: bar 4, base 0xa000, size: 0x100
[ 27.461364] ACPI: PCI Interrupt Link [APC3] enabled at IRQ 18
[ 27.461612] general protection fault: 0000 [#1] SMP
[ 27.461724] Modules linked in: fglrx(POE+) snd_hda_codec_hdmi snd_hda_intel snd_hda_codec input_leds snd_hda_core amd64_edac_mod(+) edac_core snd_hwdep serio_raw k8temp(+) edac_mce_amd amd_iommu_v2 snd_intel8x0(+) snd_ac97_codec shpchp ac97_bus snd_mpu401_uart snd_pcm i2c_nforce2 ns558 snd_seq_midi snd_seq_midi_event snd_rawmidi 8250_fintek mac_hid snd_seq snd_seq_device snd_timer asus_atk0110 snd gameport soundcore parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq hid_generic usbhid hid pata_acpi forcedeth pata_amd sata_nv floppy
[ 27.463451] CPU: 1 PID: 278 Comm: systemd-udevd Tainted: P OE 4.2.0-14-generic #16-Ubuntu
[ 27.463494] Hardware name: System manufacturer System Product Name/A8N-E, BIOS ASUS A8N-E ACPI BIOS Revision 1013 04/07/2006
[ 27.463537] task: ffff8800bfabb200 ti: ffff88013a0b4000 task.ti: ffff88013a0b4000
[ 27.463578] RIP: 0010:[<ffffffffc037ac91>] [<ffffffffc037ac91>] firegl_trace+0x61/0x1e0 [fglrx]
[ 27.463925] RSP: 0018:ffff88013a0b7aa8 EFLAGS: 00010282
[ 27.463964] RAX: 0000000000000001 RBX: ffff88013a0b7b87 RCX: 00000000000012cf
[ 27.464006] RDX: ffffffffc0577430 RSI: ffffffffc037ac91 RDI: 0000000000000004
[ 27.464012] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffffc05e04f0
[ 27.464012] R10: ffff8800b9326000 R11: ffffffffc0385bf0 R12: 000000000000000d
[ 27.464012] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffffc05e04f0
[ 27.464012] FS: 00007f2db918f8c0(0000) GS:ffff88013fd00000(0000) knlGS:0000000000000000
[ 27.464012] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 27.464012] CR2: 00007f2db91ad000 CR3: 000000013a0a9000 CR4: 00000000000006e0
[ 27.464012] Stack:
[ 27.464012] 000012cf00000092 ffffffffc0577430 0000000000000096 0000000000000096
[ 27.464012] ffff88013a0b7b08 ffffffff8168e1dc ffff88013a513400 0000000000000004
[ 27.464012] ffff88013a513400 ffff88013a0b7b96 0000000000000286 ffffffff811cfa83
[ 27.464012] Call Trace:
[ 27.464012] [<ffffffff8168e1dc>] ? pci_conf1_read+0xbc/0x100
[ 27.464012] [<ffffffff811cfa83>] ? __kmalloc+0xa3/0x250
[ 27.464012] [<ffffffffc0341013>] ? KCL_MEM_SmallBufferAlloc+0x13/0x20 [fglrx]
[ 27.464012] [<ffffffffc0346cae>] ? KCL_STR_Memcpy+0xe/0x10 [fglrx]
[ 27.464012] [<ffffffffc03e6866>] ? asyncIOInit+0xa6/0xe0 [fglrx]
[ 27.464012] [<ffffffffc0385bf0>] ? asyncioSvcInitContext+0x30/0x30 [fglrx]
[ 27.464012] [<ffffffffc0385c30>] ? asyncioSvcInstallFn+0x40/0x40 [fglrx]
[ 27.464012] [<ffffffff817a5355>] ? klist_next+0x25/0x100
[ 27.464012] [<ffffffffc0385cb0>] ? asyncioSvcRemoveFn+0x80/0x80 [fglrx]
[ 27.464012] [<ffffffffc0342b03>] ? KAS_Initialize+0x113/0x1b0 [fglrx]
[ 27.464012] [<ffffffffc03526c2>] ? firegl_init+0xe2/0xf0 [fglrx]
[ 27.464012] [<ffffffffc0364e80>] ? firegl_find_interrupt_by_sourceid+0x50/0x50 [fglrx]
[ 27.464012] [<ffffffffc0364ea0>] ? IRQMGR_CallbackWrapper+0x20/0x20 [fglrx]
[ 27.464012] [<ffffffffc101227e>] ? firegl_init_module+0x27e/0x1000 [fglrx]
[ 27.464012] [<ffffffffc1012000>] ? 0xffffffffc1012000
[ 27.468510] [<ffffffff81002123>] ? do_one_initcall+0xb3/0x200
[ 27.468510] [<ffffffff817b3da2>] ? preempt_schedule_common+0x22/0x40
[ 27.468510] [<ffffffff817b3ddc>] ? _cond_resched+0x1c/0x30
[ 27.468510] [<ffffffff811ceff9>] ? kmem_cache_alloc_trace+0x89/0x1f0
[ 27.468510] [<ffffffff817aea5d>] ? do_init_module+0x28/0x1e7
[ 27.468510] [<ffffffff817aea95>] ? do_init_module+0x60/0x1e7
[ 27.468510] [<ffffffff810f9956>] ? load_module+0x1676/0x1c10
[ 27.468510] [<ffffffff810f5c60>] ? __symbol_put+0x40/0x40
[ 27.468510] [<ffffffff810fa0fa>] ? SyS_finit_module+0x9a/0xc0
[ 27.468510] [<ffffffff817b77b2>] ? entry_SYSCALL_64_fastpath+0x16/0x75
[ 27.468510] Code: df 00 00 00 48 89 54 24 08 89 4c 24 04 ff e6 0f 29 7b f1 0f 29 73 e1 0f 29 6b d1 0f 29 63 c1 0f 29 5b b1 0f 29 53 a1 0f 29 4b 91 <0f> 29 43 81 e8 26 9a fc ff 48 89 c7 e8 5e ae fd ff 44 89 e1 c1
[ 27.469827] RIP [<ffffffffc037ac91>] firegl_trace+0x61/0x1e0 [fglrx]
[ 27.469827] RSP <ffff88013a0b7aa8>
[ 27.471417] ---[ end trace 8a2116025344bc47 ]---

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: xorg 1:7.7+7ubuntu4
ProcVersionSignature: Ubuntu 4.2.0-14.16-generic 4.2.2
Uname: Linux 4.2.0-14-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.19-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Tue Oct 6 10:14:22 2015
DistUpgraded: 2015-10-05 18:28:39,309 DEBUG enabling apt cron job
DistroCodename: wily
DistroVariant: ubuntu
DkmsStatus:
 fglrx-updates-core, 15.201, 4.2.0-14-generic, x86_64: installed
 virtualbox, 5.0.4, 3.19.0-30-generic, x86_64: installed
 virtualbox, 5.0.4, 4.2.0-14-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GpuHangFrequency: This is the first time
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Tahiti PRO [Radeon HD 7950/8950 OEM / R9 280] [1002:679a] (prog-if 00 [VGA controller])
   Subsystem: XFX Pine Group Inc. Device [1682:3221]
InstallationDate: Installed on 2014-04-10 (544 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326.1)
JournalErrors:
 No journal files were found.
 -- No entries --
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 002: ID 046d:c062 Logitech, Inc. M-UAS144 [LS1 Laser Mouse]
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: System manufacturer System Product Name
ProcEnviron:
 LANGUAGE=en_CA:en
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.2.0-14-generic root=UUID=0d70511b-d11e-418e-9a37-2466c6501fda ro recovery nomodeset rootflags=subvol=@
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to wily on 2015-10-05 (0 days ago)
dmi.bios.date: 04/07/2006
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: ASUS A8N-E ACPI BIOS Revision 1013
dmi.board.name: A8N-E
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: 2.XX
dmi.chassis.asset.tag: 123456789000
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvrASUSA8N-EACPIBIOSRevision1013:bd04/07/2006:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnA8N-E:rvr2.XX:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz N/A
version.fglrx-installer: fglrx-installer N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.0-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.0-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Tue Oct 6 09:39:42 2015
xserver.configfile: default
xserver.devices:

xserver.errors:
 Failed to load module "fbdev" (module does not exist, 0)
 Failed to load module "vesa" (module does not exist, 0)
 Failed to load module "fbdev" (module does not exist, 0)
 Failed to load module "vesa" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.17.2-1ubuntu9