Hi Joseph - in the past few days created a script to show a pop up when I get any kernel oopses and that is what caused me to raise the bug. However, checking my logs the earliest occurrence I have is from April 21 with same kernel version (3.13.0-24-generic):


Apr 21 18:10:09 faire kernel: [ 5637.053582] PM: Syncing filesystems ... done.
Apr 21 18:10:09 faire kernel: [ 5637.058987] PM: Preparing system for mem sleep
Apr 21 18:10:09 faire kernel: [ 5637.059271] mmc0: card b368 removed
Apr 21 18:25:39 faire kernel: [ 5637.061398] Freezing user space processes ... (elapsed 0.001 seconds) done.
Apr 21 18:25:39 faire kernel: [ 5637.063221] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
Apr 21 18:25:39 faire kernel: [ 5637.064492] PM: Entering mem sleep
Apr 21 18:25:39 faire kernel: [ 5637.064569] Suspending console(s) (use no_console_suspend to debug)
Apr 21 18:25:39 faire kernel: [ 5637.205560] sd 1:0:0:0: [sdb] Synchronizing SCSI cache
Apr 21 18:25:39 faire kernel: [ 5637.205608] sd 1:0:0:0: [sdb] Stopping disk
Apr 21 18:25:39 faire kernel: [ 5637.205617] sd 0:0:0:0: [sda] Synchronizing SCSI cache
Apr 21 18:25:39 faire kernel: [ 5637.207564] sd 0:0:0:0: [sda] Stopping disk
Apr 21 18:25:39 faire kernel: [ 5637.431859] ------------[ cut here ]------------
Apr 21 18:25:39 faire kernel: [ 5637.431894] WARNING: CPU: 1 PID: 11523 at /build/buildd/linux-3.13.0/drivers/gpu/drm/i915/intel_uncore.c:125 gen6_gt_check_fifodbg.isra.9+0x38/0x50 [i915]()
Apr 21 18:25:39 faire kernel: [ 5637.431895] MMIO read or write has been dropped ffffffff
Apr 21 18:25:39 faire kernel: [ 5637.431918] Modules linked in: snd_seq_dummy snd_hrtimer ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 cuse nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables deflate ctr twofish_generic twofish_avx_x86_64 twofish_x86_64_3way twofish_x86_64 twofish_common camellia_generic camellia_aesni_avx2 camellia_aesni_avx_x86_64 camellia_x86_64 serpent_avx2 serpent_avx_x86_64 serpent_sse2_x86_64 xts serpent_generic blowfish_generic blowfish_x86_64 blowfish_common joydev cast5_avx_x86_64 cast5_generic cast_common des_generic cmac xcbc rmd160 crypto_null af_key xfrm_algo arc4 intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp uvcvideo videobuf2_vmalloc kvm_intel videobuf2_memops videobuf2_core videodev iwlmvm kvm mac80211 thinkpad_acpi nvram snd_seq_midi psmouse snd_seq_midi_event snd_rawmidi serio_raw snd_hda_codec_hdmi snd_hda_codec_realtek iwlwifi snd_hda_intel snd_hda_codec snd_seq snd_hwdep lpc_ich rtsx_pci_ms memstick cfg80211 btusb bluetooth mei_me mei snd_pcm snd_seq_device snd_page_alloc snd_timer snd parport_pc soundcore mac_hid ppdev intel_smartconnect lp parport binfmt_misc nls_iso8859_1 dm_crypt hid_generic usbhid hid mmc_block rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd e1000e ahci libahci ptp rtsx_pci i915 pps_core wmi i2c_algo_bit video drm_kms_helper drm
Apr 21 18:25:39 faire kernel: [ 5637.431943] CPU: 1 PID: 11523 Comm: kworker/u16:8 Not tainted 3.13.0-24-generic #46-Ubuntu
Apr 21 18:25:39 faire kernel: [ 5637.431944] Hardware name: LENOVO 20AQCTO1WW/20AQCTO1WW, BIOS GJET71WW (2.21 ) 02/10/2014
Apr 21 18:25:39 faire kernel: [ 5637.431956] Workqueue: i915 gen6_force_wake_work [i915]
Apr 21 18:25:39 faire kernel: [ 5637.431958]  0000000000000009 ffff8802cccf9d38 ffffffff81715a64 ffff8802cccf9d80
Apr 21 18:25:39 faire kernel: [ 5637.431959]  ffff8802cccf9d70 ffffffff810676bd ffff88003fba0020 ffff88003fba0028
Apr 21 18:25:39 faire kernel: [ 5637.431960]  0000000000000246 0000000000000000 0000000000000200 ffff8802cccf9dd0
Apr 21 18:25:39 faire kernel: [ 5637.431961] Call Trace:
Apr 21 18:25:39 faire kernel: [ 5637.431964]  [<ffffffff81715a64>] dump_stack+0x45/0x56
Apr 21 18:25:39 faire kernel: [ 5637.431966]  [<ffffffff810676bd>] warn_slowpath_common+0x7d/0xa0
Apr 21 18:25:39 faire kernel: [ 5637.431968]  [<ffffffff8106772c>] warn_slowpath_fmt+0x4c/0x50
Apr 21 18:25:39 faire kernel: [ 5637.431979]  [<ffffffffa00fade8>] gen6_gt_check_fifodbg.isra.9+0x38/0x50 [i915]
Apr 21 18:25:39 faire kernel: [ 5637.431988]  [<ffffffffa00fae8b>] __gen6_gt_force_wake_mt_put+0x2b/0x30 [i915]
Apr 21 18:25:39 faire kernel: [ 5637.431996]  [<ffffffffa00fabb7>] gen6_force_wake_work+0x37/0x50 [i915]
Apr 21 18:25:39 faire kernel: [ 5637.431998]  [<ffffffff810838a2>] process_one_work+0x182/0x450
Apr 21 18:25:39 faire kernel: [ 5637.432000]  [<ffffffff81084641>] worker_thread+0x121/0x410
Apr 21 18:25:39 faire kernel: [ 5637.432002]  [<ffffffff81084520>] ? rescuer_thread+0x3e0/0x3e0
Apr 21 18:25:39 faire kernel: [ 5637.432003]  [<ffffffff8108b312>] kthread+0xd2/0xf0
Apr 21 18:25:39 faire kernel: [ 5637.432005]  [<ffffffff8108b240>] ? kthread_create_on_node+0x1d0/0x1d0
Apr 21 18:25:39 faire kernel: [ 5637.432006]  [<ffffffff8172637c>] ret_from_fork+0x7c/0xb0
Apr 21 18:25:39 faire kernel: [ 5637.432007]  [<ffffffff8108b240>] ? kthread_create_on_node+0x1d0/0x1d0
Apr 21 18:25:39 faire kernel: [ 5637.432008] ---[ end trace 849e9663d48306ae ]---
Apr 21 18:25:39 faire kernel: [ 5637.459853] PM: suspend of devices complete after 395.297 msecs
Apr 21 18:25:39 faire kernel: [ 5637.460020] PM: late suspend of devices complete after 0.165 msecs
Apr 21 18:25:39 faire kernel: [ 5637.476038] ehci-pci 0000:00:1d.0: System wakeup enabled by ACPI
Apr 21 18:25:39 faire kernel: [ 5637.491896] e1000e 0000:00:19.0: System wakeup enabled by ACPI
Apr 21 18:25:39 faire kernel: [ 5637.523824] xhci_hcd 0000:00:14.0: System wakeup enabled by ACPI
Apr 21 18:25:39 faire kernel: [ 5637.540061] PM: noirq suspend of devices complete after 80.068 msecs
Apr 21 18:25:39 faire kernel: [ 5637.540435] ACPI: Preparing to enter system sleep state S3
Apr 21 18:25:39 faire kernel: [ 5637.542385] PM: Saving platform NVS memory

Full log attached.