Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 0 PID: 2438 at drivers/gpu/drm/i915/intel_display.c:9713 intel_check_page_flip+0xdb/0xf0 [i915]()
Kicking stuck page flip: queued at 9245, now 9249
Modules linked in: rfcomm fuse xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun ccm ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 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 vfat fat arc4 snd_hda_codec_hdmi intel_rapl uvcvideo videobuf2_vmalloc coretemp snd_hda_codec_via rtl8723be videobuf2_core kvm_intel videobuf2_memops btcoexist snd_soc_rt5640 snd_hda_codec_generic v4l2_common rtl8723_common rtl_pci snd_intel_sst_acpi snd_intel_sst_core snd_soc_sst_mfld_platform rtlwifi snd_soc_rl6231 videodev
 kvm snd_soc_core media snd_hda_intel snd_compress mac80211 snd_hda_controller iTCO_wdt crct10dif_pclmul cfg80211 snd_hda_codec iTCO_vendor_support crc32_pclmul crc32c_intel snd_hwdep snd_seq btusb bluetooth ghash_clmulni_intel snd_seq_device rtsx_pci_ms memstick joydev snd_pcm regmap_i2c snd_timer snd soundcore serio_raw rfkill_gpio wmi i2c_hid rfkill mei_txe snd_soc_sst_acpi dw_dmac i2c_designware_platform dw_dmac_core mei lpc_ich shpchp i2c_i801 i2c_designware_core iosf_mbi nfsd auth_rpcgss nfs_acl lockd grace sunrpc binfmt_misc i915 i2c_algo_bit drm_kms_helper drm rtsx_pci_sdmmc r8169 mii rtsx_pci mfd_core sdhci_acpi sdhci mmc_core video
CPU: 0 PID: 2438 Comm: Socket Thread Not tainted 3.19.4-200.fc21.x86_64 #1
Hardware name: GIGABYTE Q21/Q21, BIOS 1.03.09RGI4 09/01/2014
 0000000000000000 000000006de73a06 ffff88023fc03ce8 ffffffff8176e845
 0000000000000000 ffff88023fc03d40 ffff88023fc03d28 ffffffff8109bc1a
 ffff88023fc03d28 ffff880235e34000 ffff88023397c000 0000000000000000
Call Trace:
 <IRQ>  [<ffffffff8176e845>] dump_stack+0x45/0x57
 [<ffffffff8109bc1a>] warn_slowpath_common+0x8a/0xc0
 [<ffffffff8109bca5>] warn_slowpath_fmt+0x55/0x70
 [<ffffffffa01974bb>] intel_check_page_flip+0xdb/0xf0 [i915]
 [<ffffffffa0160656>] valleyview_pipestat_irq_handler+0x206/0x210 [i915]
 [<ffffffffa0165e61>] valleyview_irq_handler+0xc1/0x170 [i915]
 [<ffffffff810f2a47>] handle_irq_event_percpu+0x77/0x1a0
 [<ffffffff810f2bab>] handle_irq_event+0x3b/0x60
 [<ffffffff810f5d6e>] handle_edge_irq+0x6e/0x120
 [<ffffffff81017414>] handle_irq+0x74/0x140
 [<ffffffff81777dbf>] do_IRQ+0x4f/0xf0
 [<ffffffff81775bad>] common_interrupt+0x6d/0x6d
 <EOI>  [<ffffffff816aa8e1>] ? tcp_poll+0x61/0x240
 [<ffffffff816aaaa9>] ? tcp_poll+0x229/0x240
 [<ffffffff8163de81>] sock_poll+0x51/0x120
 [<ffffffff812304c2>] do_sys_poll+0x352/0x5d0
 [<ffffffff8122f010>] ? poll_select_copy_remaining+0x150/0x150
 [<ffffffff8123600a>] ? file_update_time+0xaa/0xf0
 [<ffffffff8121c125>] ? __sb_end_write+0x35/0x70
 [<ffffffff81222433>] ? pipe_write+0x393/0x450
 [<ffffffff810d26dc>] ? update_curr+0xdc/0x170
 [<ffffffff8163e93d>] ? SYSC_recvfrom+0x18d/0x1a0
 [<ffffffff810ce527>] ? set_next_entity+0x67/0x80
 [<ffffffff817706da>] ? __schedule+0x2ca/0x850
 [<ffffffff81230867>] SyS_poll+0x97/0x120
 [<ffffffff81775049>] system_call_fastpath+0x12/0x17

Potential duplicate: bug 1207169