WARNING in intel_uncore.c:125 gen6_gt_check_fifodbg.isra.9+0x38/0x50 [i915]() during suspend

[Seth Arnold]

I spotted the following warning in my dmesg:

[110593.204346] PM: Syncing filesystems ... done.
[110593.324940] PM: Preparing system for mem sleep
[110593.325213] Freezing user space processes ... (elapsed 0.001 seconds) done.
[110593.327069] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
[110593.328343] PM: Entering mem sleep
[110593.328383] Suspending console(s) (use no_console_suspend to debug)
[110593.456710] sd 1:0:0:0: [sdb] Synchronizing SCSI cache
[110593.456767] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[110593.456828] sd 1:0:0:0: [sdb] Stopping disk
[110593.456829] sd 0:0:0:0: [sda] Stopping disk
[110593.692664] ------------[ cut here ]------------
[110593.692693] WARNING: CPU: 2 PID: 11019 at /build/buildd/linux-3.13.0/drivers/gpu/drm/i915/intel_uncore.c:125 gen6_gt_check_fifodbg.isra.9+0x38/0x50 [i915]()
[110593.692693] MMIO read or write has been dropped ffffffff
[110593.692710] Modules linked in: overlayfs hid_generic usbhid hid ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp bridge stp llc ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables ctr ccm rfcomm bnep binfmt_misc joydev dm_crypt snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec dm_multipath scsi_dh snd_hwdep snd_pcm snd_page_alloc intel_rapl x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm snd_seq_midi snd_seq_midi_event snd_rawmidi crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core arc4 thinkpad_acpi videodev nvram psmouse btusb iwldvm snd_seq serio_raw bluetooth mac80211 iwlwifi snd_seq_device snd_timer snd cfg80211 soundcore mac_hid mei_me mei lpc_ich parport_pc ppdev coretemp lp parport btrfs xor raid6_pq libcrc32c i915 ahci libahci e1000e sdhci_pci i2c_algo_bit sdhci ptp pps_core drm_kms_helper drm wmi video
[110593.692721] CPU: 2 PID: 11019 Comm: kworker/u16:14 Not tainted 3.13.0-23-generic #45-Ubuntu
[110593.692722] Hardware name: LENOVO 2359CTO/2359CTO, BIOS G4ET62WW (2.04 ) 09/13/2012
[110593.692731] Workqueue: i915 gen6_force_wake_work [i915]
[110593.692733] 0000000000000009 ffff88007ff95d38 ffffffff81715384 ffff88007ff95d80
[110593.692735] ffff88007ff95d70 ffffffff810676bd ffff880402084020 ffff880402084028
[110593.692736] 0000000000000246 0000000000000000 0000000000000200 ffff88007ff95dd0
[110593.692736] Call Trace:
[110593.692740] [<ffffffff81715384>] dump_stack+0x45/0x56
[110593.692743] [<ffffffff810676bd>] warn_slowpath_common+0x7d/0xa0
[110593.692744] [<ffffffff8106772c>] warn_slowpath_fmt+0x4c/0x50
[110593.692753] [<ffffffffa0174de8>] gen6_gt_check_fifodbg.isra.9+0x38/0x50 [i915]
[110593.692761] [<ffffffffa0174e8b>] __gen6_gt_force_wake_mt_put+0x2b/0x30 [i915]
[110593.692769] [<ffffffffa0174bb7>] gen6_force_wake_work+0x37/0x50 [i915]
[110593.692771] [<ffffffff81083892>] process_one_work+0x182/0x450
[110593.692773] [<ffffffff81084631>] worker_thread+0x121/0x410
[110593.692774] [<ffffffff81084510>] ? rescuer_thread+0x3e0/0x3e0
[110593.692776] [<ffffffff8108b302>] kthread+0xd2/0xf0
[110593.692777] [<ffffffff8108b230>] ? kthread_create_on_node+0x1d0/0x1d0
[110593.692779] [<ffffffff81725cbc>] ret_from_fork+0x7c/0xb0
[110593.692780] [<ffffffff8108b230>] ? kthread_create_on_node+0x1d0/0x1d0
[110593.692781] ---[ end trace c249140958e3daff ]---
[110594.849092] PM: suspend of devices complete after 1520.212 msecs
[110594.849224] PM: late suspend of devices complete after 0.130 msecs
[110594.865134] ehci-pci 0000:00:1d.0: System wakeup enabled by ACPI
[110594.881219] ehci-pci 0000:00:1a.0: System wakeup enabled by ACPI
[110594.897052] e1000e 0000:00:19.0: System wakeup enabled by ACPI
[110594.929056] xhci_hcd 0000:00:14.0: System wakeup enabled by ACPI
[110594.945076] PM: noirq suspend of devices complete after 95.824 msecs
[110594.945675] ACPI: Preparing to enter system sleep state S3
[110594.948655] PM: Saving platform NVS memory
[110594.949281] Disabling non-boot CPUs ...
[110594.950463] kvm: disabling virtualization on CPU1
[110595.053029] smpboot: CPU 1 is now offline
[110595.054450] kvm: disabling virtualization on CPU2
[110595.157055] smpboot: CPU 2 is now offline
[110595.158455] kvm: disabling virtualization on CPU3
[110595.261077] smpboot: CPU 3 is now offline
[110595.263291] ACPI: Low-level resume complete
[110595.263355] PM: Restoring platform NVS memory
[110595.264044] Enabling non-boot CPUs ...
[110595.264109] x86: Booting SMP configuration:
[110595.264110] smpboot: Booting Node 0 Processor 1 APIC 0x1
[110595.275357] kvm: enabling virtualization on CPU1
[110595.335652] CPU1 is up
[110595.335692] smpboot: Booting Node 0 Processor 2 APIC 0x2
[110595.346935] kvm: enabling virtualization on CPU2
[110595.387668] CPU2 is up
[110595.387712] smpboot: Booting Node 0 Processor 3 APIC 0x3
[110595.398961] kvm: enabling virtualization on CPU3
[110595.439688] CPU3 is up
[110595.442662] ACPI: Waking up from system sleep state S3

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-23-generic 3.13.0-23.45
ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
Uname: Linux 3.13.0-23-generic x86_64
ApportVersion: 2.14.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: sarnold 2876 F.... pulseaudio
CurrentDesktop: Unity
Date: Fri Apr 18 11:30:08 2014
HibernationDevice: RESUME=UUID=81b2976f-2830-4449-9dae-e1d44a43fa78
InstallationDate: Installed on 2012-10-18 (547 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
MachineType: LENOVO 2359CTO
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-23-generic root=UUID=7b8c2e1b-d2e6-47d9-9030-c078e9701a1d ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-23-generic N/A
 linux-backports-modules-3.13.0-23-generic N/A
 linux-firmware 1.127
SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-04-12 (6 days ago)
dmi.bios.date: 09/13/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: G4ET62WW (2.04 )
dmi.board.asset.tag: Not Available
dmi.board.name: 2359CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrG4ET62WW(2.04):bd09/13/2012:svnLENOVO:pn2359CTO:pvrThinkPadT530:rvnLENOVO:rn2359CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2359CTO
dmi.product.version: ThinkPad T530
dmi.sys.vendor: LENOVO

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.15 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.15-rc1-trusty/

[Seth Arnold (seth-arnold)]

I just updated to 3.13.0-24-generic and didn't see this warning after a single suspend/resume cycle. If we're lucky this has already been addressed.

Thanks

[Seth Arnold (seth-arnold)]

And again, no more instances of this warning in my dmesg when resuming this morning. I suspect this has already been handled.

Thanks

[penalvch (penalvch)]

Seth Arnold, this bug report is being closed due to your last comment https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1309684/comments/4 regarding this being fixed with an update. Thank you again for taking the time to report this bug and helping to make Ubuntu better. Please submit any future bugs you may find.