BUG: soft lockup - CPU#0 stuck for 23s! [Xorg:1295]
Modules linked in: uas joydev hid_lenovo_tpkbd bnep rfcomm bluetooth eeepc_wmi 6lowpan_iphc asus_wmi sparse_keymap intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel fglrx(POE) snd_usb_audio snd_hda_codec_realtek aesni_intel snd_hda_codec_generic snd_usbmidi_lib aes_x86_64 snd_hda_codec_hdmi lrw gf128mul snd_seq_midi glue_helper snd_seq_midi_event ablk_helper cryptd snd_hda_intel serio_raw snd_hda_controller snd_rawmidi snd_hda_codec lpc_ich snd_hwdep parport_serial snd_pcm snd_seq snd_seq_device snd_timer amd_iommu_v2 snd mac_hid mei_me soundcore mei shpchp parport_pc ppdev lp parport hid_generic usbhid hid firewire_ohci mxm_wmi firewire_core r8169 ahci crc_itu_t libahci mii video wmi
CPU: 0 PID: 1295 Comm: Xorg Tainted: P           OE 3.15.0-6-generic #11-Ubuntu
Hardware name: System manufacturer System Product Name/P8Z68-V LX, BIOS 0703 10/21/2011
task: ffff88080efb0000 ti: ffff880811f20000 task.ti: ffff880811f20000
RIP: 0010:[<ffffffffa02dca8c>]  [<ffffffffa02dca8c>] ulReadMmRegisterUlongViaAddr+0xc/0x10 [fglrx]
RSP: 0018:ffff880811f23c18  EFLAGS: 00000286
RAX: 0000000010410310 RBX: 0000000000001b9c RCX: 0000000000008000
RDX: 0000000000001e9c RSI: 0000000000001e9c RDI: ffffc90007e40000
RBP: ffffc900075aa008 R08: 0000000000001b9c R09: ffff88080ef4c806
R10: 0000000000000172 R11: 0000000000000000 R12: 0000000000000172
R13: 0000000000000000 R14: ffffc9000910ce80 R15: ffffc900075aa008
FS:  00007fc5057239c0(0000) GS:ffff88083f400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc507456298 CR3: 000000080d42f000 CR4: 00000000000407f0
Stack:
 ffffffffa0324570 0000000000000172 ffffffffa032308b ffff880811f23cd0
 ffffc900075aa008 0000004100000001 ffff880800000000 0000000000001e9c
 c6090300a0408f64 88080ef4b0150001 88080ef4c804ffff 01ff05000402ffff
Call Trace:
 [<ffffffffa0324570>] ? ProcessTest+0x10/0x80 [fglrx]
 [<ffffffffa032308b>] ? ParseTable+0x12b/0x290 [fglrx]
 [<ffffffffa0407308>] ? PEM_HandleEvent+0x18/0xd0 [fglrx]
 [<ffffffffa02e6fd5>] ? ATOM_ExecuteBIOSTable+0xb5/0x140 [fglrx]
 [<ffffffffa02dbf91>] ? CAIL_ExecuteBIOSTable+0x71/0x80 [fglrx]
 [<ffffffffa02aed98>] ? firegl_cail_mcil_exec_bios_table+0x88/0xe0 [fglrx]
 [<ffffffffa02ac766>] ? firegl_cail_query_asic_info+0x1e6/0x3b0 [fglrx]
 [<ffffffff811b2da9>] ? __kmalloc+0x169/0x260
 [<ffffffffa0294213>] ? KCL_MEM_SmallBufferAlloc+0x13/0x20 [fglrx]
 [<ffffffffa02a34e4>] ? firegl_query_asic_info+0xb4/0x260 [fglrx]
 [<ffffffffa02a3430>] ? firegl_query_mc_range+0xc0/0xc0 [fglrx]
 [<ffffffffa02a300d>] ? firegl_ioctl+0x1ed/0x250 [fglrx]
 [<ffffffffa02911de>] ? ip_firegl_unlocked_ioctl+0xe/0x20 [fglrx]
 [<ffffffff811e4e28>] ? do_vfs_ioctl+0x2c8/0x4a0
 [<ffffffff810a3e94>] ? vtime_account_user+0x54/0x60
 [<ffffffff811e5081>] ? SyS_ioctl+0x81/0xa0
 [<ffffffff8176e33f>] ? tracesys+0xe1/0xe6
Code: 10 4c 8b 64 24 18 4c 8b 6c 24 20 31 f6 48 83 c4 28 e9 09 00 00 00 66 66 90 66 66 90 66 66 90 31 c0 48 85 ff 74 05 89 f2 8b 04 97 <c3> 66 66 90 48 85 ff 74 05 89 f1 89 14 8f c3 66 66 90 66 90 0f