Additional info:
reporter:       libreport-2.2.3
BUG: soft lockup - CPU#2 stuck for 22s! [kworker/2:0:1996]
Modules linked in: fuse nf_conntrack_netbios_ns nf_conntrack_broadcast ccm 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 btusb arc4 bluetooth iwldvm mac80211 x86_pkg_temp_thermal snd_hda_codec_realtek coretemp kvm_intel snd_hda_codec_generic kvm snd_hda_intel snd_hda_controller snd_hda_codec sdhci_pci iTCO_wdt uvcvideo sdhci videobuf2_vmalloc mmc_core iTCO_vendor_support iwlwifi snd_hwdep tpm_tis cfg80211 videobuf2_memops videobuf2_core joydev
tpm snd_seq snd_seq_device i2c_i801 snd_pcm shpchp e1000e ptp snd_timer thinkpad_acpi pps_core serio_raw videodev mei_me media mei lpc_ich snd mfd_core rfkill microcode soundcore nfsd auth_rpcgss nfs_acl lockd sunrpc dm_crypt nouveau i915 mxm_wmi crct10dif_pclmul ttm crc32_pclmul crc32c_intel i2c_algo_bit drm_kms_helper ghash_clmulni_intel drm firewire_ohci firewire_core crc_itu_t i2c_core wmi video
CPU: 2 PID: 1996 Comm: kworker/2:0 Not tainted 3.15.6-200.fc20.x86_64 #1
Hardware name: LENOVO 2436CTO/2436CTO, BIOS G5ET98WW (2.58 ) 04/01/2014
Workqueue: pm pm_runtime_work
task: ffff88080f73cf00 ti: ffff880804318000 task.ti: ffff880804318000
RIP: 0010:[<ffffffff81362682>]  [<ffffffff81362682>] ioread32+0x42/0x50
RSP: 0018:ffff88080431ba00  EFLAGS: 00000296
RAX: 00000000ffffffff RBX: 00000000ffffffff RCX: 00000000ffffffff
RDX: ffff880812534400 RSI: 0000000077359400 RDI: ffffc90018b02634
RBP: ffff88080431ba40 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 000000000000000f R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000000f
FS:  0000000000000000(0000) GS:ffff88083e280000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6b9cd59000 CR3: 0000000001c11000 CR4: 00000000001407e0
Stack:
ffffffffa02543e4 0000000077359400 ffffffffffffffff ffff88080f6d6b40
ffff88080dd28000 ffff88080fa7af80 ffff88080f534100 0000000000000210
ffff88080431ba80 ffffffffa026dfad 00000001000002d2 ffff88080f6d6b40
Call Trace:
[<ffffffffa02543e4>] ? nouveau_timer_wait_eq+0x64/0xd0 [nouveau]
[<ffffffffa026dfad>] nve0_fifo_context_detach+0x9d/0x180 [nouveau]
[<ffffffffa021173d>] nouveau_engctx_fini+0x6d/0xf0 [nouveau]
[<ffffffffa0211862>] _nouveau_engctx_fini+0x12/0x20 [nouveau]
[<ffffffffa0213e26>] nouveau_object_dec+0x106/0x290 [nouveau]
[<ffffffffa0213e84>] nouveau_object_dec+0x164/0x290 [nouveau]
[<ffffffffa021282a>] nouveau_handle_fini+0x1fa/0x2a0 [nouveau]
[<ffffffffa02126ec>] nouveau_handle_fini+0xbc/0x2a0 [nouveau]
[<ffffffffa02126ec>] nouveau_handle_fini+0xbc/0x2a0 [nouveau]
[<ffffffffa02126ec>] nouveau_handle_fini+0xbc/0x2a0 [nouveau]
[<ffffffffa02111e2>] nouveau_client_fini+0x62/0xb0 [nouveau]
[<ffffffffa0294f48>] nouveau_do_suspend+0x238/0x2b0 [nouveau]
[<ffffffffa0295a01>] nouveau_pmops_runtime_suspend+0x61/0xf0 [nouveau]
[<ffffffff8138e701>] pci_pm_runtime_suspend+0x61/0x140
[<ffffffff81466cc1>] __rpm_callback+0x31/0x80
[<ffffffff81466d34>] rpm_callback+0x24/0x80
[<ffffffff81466eb1>] rpm_suspend+0x121/0x630
[<ffffffff8146847a>] pm_runtime_work+0x7a/0xb0
[<ffffffff810a4af6>] process_one_work+0x176/0x430
[<ffffffff810a578b>] worker_thread+0x11b/0x3a0
[<ffffffff810a5670>] ? rescuer_thread+0x3b0/0x3b0
[<ffffffff810ac528>] kthread+0xd8/0xf0
[<ffffffff810ac450>] ? insert_kthread_work+0x40/0x40
[<ffffffff816ff43c>] ret_from_fork+0x7c/0xb0
[<ffffffff810ac450>] ? insert_kthread_work+0x40/0x40
Code: 66 0f 1f 84 00 00 00 00 00 55 48 c7 c6 3a 0a a5 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