Additional info:
reporter:       libreport-2.1.12
BUG: soft lockup - CPU#4 stuck for 23s! [Xorg:599]
Modules linked in: tcp_lp rfcomm ipt_MASQUERADE xt_CHECKSUM tun 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 fuse arc4 iwldvm mac80211 x86_pkg_temp_thermal coretemp snd_hda_codec_hdmi kvm_intel kvm crc32_pclmul crc32c_intel snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_page_alloc snd_timer mei_me uvcvideo sdhci_pci videobuf2_vmalloc sdhci videobuf2_memops videobuf2_core snd videodev alx media iTCO_wdt ghash_clmulni_intel iwlwifi joydev mmc_core iTCO_vendor_support jmb38x_ms mei lpc_ich btusb bluetooth soundcore cfg80211 i2c_i801 memstick mdio mfd_core ideapad_laptop microcode serio_raw sparse_keymap rfkill shpchp mperf nfsd auth_rpcgss nfs_acl lockd sunrpc nouveau i2c_algo_bit drm_kms_helper ttm mxm_wmi drm i2c_core video wmi
CPU: 4 PID: 599 Comm: Xorg Not tainted 3.11.10-301.fc20.x86_64 #1
Hardware name: LENOVO 20193/INVALID, BIOS 6BCN34WW(V1.05) 11/29/2012
task: ffff88043a4887a0 ti: ffff88043ad0c000 task.ti: ffff88043ad0c000
RIP: 0010:[<ffffffff8130dd82>]  [<ffffffff8130dd82>] ioread32+0x42/0x50
RSP: 0018:ffff88043ad0dc58  EFLAGS: 00000292
RAX: 00000000bad0ac0a RBX: ffffffff81537207 RCX: ffff880385743700
RDX: 00000000bad0acb8 RSI: ffffc9000df0e488 RDI: ffffc9000df0e488
RBP: ffff88043ad0dc60 R08: 0000000001ca7af8 R09: 0000000000010002
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88045ed16f60
R13: ffff880386c07c00 R14: ffffffff815349fb R15: ffffffff8118dc3e
FS:  00007f8cc7b8d9c0(0000) GS:ffff88045ed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8cc66ad000 CR3: 000000043ac96000 CR4: 00000000001407e0
Stack:
 ffffffffa00f2485 ffff88043ad0dca0 ffffffffa011c446 00000010000003ff
 ffff88043ad0de18 ffff880445ddfb40 0000000000000000 ffff88043ae16000
 ffff88042d64f0c0 ffff88043ad0ddb8 ffffffffa0122c26 000186a000000040
Call Trace:
 [<ffffffffa00f2485>] ? _nouveau_fifo_channel_rd32+0x15/0x20 [nouveau]
 [<ffffffffa011c446>] nouveau_dma_wait+0x2b6/0x600 [nouveau]
 [<ffffffffa0122c26>] nouveau_gem_ioctl_pushbuf+0x4f6/0x1260 [nouveau]
 [<ffffffffa0036122>] drm_ioctl+0x512/0x640 [drm]
 [<ffffffff811bac7d>] do_vfs_ioctl+0x2dd/0x4b0
 [<ffffffff811baed1>] SyS_ioctl+0x81/0xa0
 [<ffffffff816533d9>] system_call_fastpath+0x16/0x1b
Code: 66 0f 1f 84 00 00 00 00 00 55 48 c7 c6 d9 da a2 81 48 89 e5 e8 f0 fe ff ff b8 ff ff ff ff 5d c3 66 0f 1f 84 00 00 00 00 00 8b 07 <c3> 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 48 81 fe ff ff 03 00