Description of problem:
Unknown - system in normal use.

Additional info:
reporter:       libreport-2.2.1
BUG: unable to handle kernel paging request at ffffc90413300ffc
IP: [<ffffffffa010d6e8>] radeon_ring_backup+0xc8/0x160 [radeon]
PGD 42f00f067 PUD 0 
Oops: 0000 [#1] SMP 
Modules linked in: ip6t_rpfilter ip6t_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw bnep max6650 it87 hwmon_vid fuse vfat fat iTCO_wdt gpio_ich iTCO_vendor_support mxm_wmi x86_pkg_temp_thermal coretemp kvm_intel snd_hda_codec_hdmi joydev snd_hda_codec_realtek snd_hda_intel snd_usb_audio kvm crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel uvcvideo snd_usbmidi_lib snd_rawmidi snd_hda_codec videobuf2_vmalloc videobuf2_memops videobuf2_core arc4 microcode sb_edac ath9k serio_raw edac_core ath9k_common ath9k_hw ath mac80211 snd_hwdep snd_seq snd_seq_device ath3k snd_pcm btusb videodev bluetooth cfg80211 media snd_page_alloc snd_timer rfkill lpc_ich i2c_i801 snd mfd_core soundcore e1000e wmi mei_me ptp pps_core mei ioatdma shpchp dca nfsd auth_rpcgss nfs_acl lockd sunrpc usb_storage raid1 radeon i2c_algo_bit drm_kms_helper firewire_ohci ttm firewire_core drm crc_itu_t i2c_core
CPU: 0 PID: 1287 Comm: Xorg Not tainted 3.12.10-300.fc20.x86_64 #1
Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./X79-UD5, BIOS F12 07/05/2012
task: ffff8804254f8000 ti: ffff88041713e000 task.ti: ffff88041713e000
RIP: 0010:[<ffffffffa010d6e8>]  [<ffffffffa010d6e8>] radeon_ring_backup+0xc8/0x160 [radeon]
RSP: 0018:ffff88041713fca8  EFLAGS: 00010246
RAX: ffff8803a32a0000 RBX: ffff8804257b12a0 RCX: 0000000000000000
RDX: ffffc90013301000 RSI: 0000000000000000 RDI: ffffc90413300ffc
RBP: ffff88041713fcd8 R08: 000000000001a384 R09: 0000000000000000
R10: ffff88043fbe7d80 R11: 0000000000000000 R12: 00000000ffffffff
R13: ffff8804257b1278 R14: 00000000000068e1 R15: ffff88041713fd20
FS:  00007f7d448979c0(0000) GS:ffff88043fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90413300ffc CR3: 000000041c501000 CR4: 00000000000407f0
Stack:
 ffff88041713fcc0 ffff8804257b0000 ffff8804257b12a0 0000000000000000
 0000000000000000 ffff88041713fd20 ffff88041713fd78 ffffffffa00de3c7
 ffff8804257b12a0 000000001713fd00 ffff8804257b0a50 ffff8804257b0018
Call Trace:
 [<ffffffffa00de3c7>] radeon_gpu_reset+0xa7/0x240 [radeon]
 [<ffffffffa000c7f5>] ? ttm_bo_wait+0x175/0x180 [ttm]
 [<ffffffffa010b60e>] radeon_gem_handle_lockup.part.6+0xe/0x20 [radeon]
 [<ffffffffa010c0e8>] radeon_gem_wait_idle_ioctl+0x98/0xf0 [radeon]
 [<ffffffffa0025c32>] drm_ioctl+0x502/0x630 [drm]
 [<ffffffff811af7b2>] ? do_readv_writev+0x172/0x230
 [<ffffffff8130bbe4>] ? timerqueue_del+0x24/0x70
 [<ffffffff811c100d>] do_vfs_ioctl+0x2dd/0x4b0
 [<ffffffff811c1261>] SyS_ioctl+0x81/0xa0
 [<ffffffff81676ea9>] system_call_fastpath+0x16/0x1b
Code: 48 85 c0 49 89 07 74 7b 41 8d 56 ff 31 c9 4c 8d 04 95 04 00 00 00 eb 06 0f 1f 00 49 8b 07 48 8b 53 08 41 8d 74 24 01 4a 8d 3c a2 <8b> 3f 89 3c 08 23 73 64 48 83 c1 04 4c 39 c1 41 89 f4 75 dc 4c 
RIP  [<ffffffffa010d6e8>] radeon_ring_backup+0xc8/0x160 [radeon]
 RSP <ffff88041713fca8>
CR2: ffffc90413300ffc