Re: [Regression][3.4-rc3][intel-dri] MMIO read or write has beendropped ffffffff

From: Daniel Vetter
Date: Sat Apr 21 2012 - 09:12:52 EST

On Sat, Apr 21, 2012 at 03:03:07PM +0200, Daniel Vetter wrote:
> On Sat, Apr 21, 2012 at 07:39:08AM +0200, Maciej Rutecki wrote:
> > Bad kernel: 3.4-rc3
> > Last known good: 3.3
> >
> > Subsystem: dri-intel (guess)
> >
> > Steps to reproduce:
> > 1. Suspend to ram
> > 2. Resume
> >
> > After resume laptop works ok, but in dmesg I found:
> > [ 164.098113] ------------[ cut here ]------------
> > [ 164.098124] WARNING: at drivers/gpu/drm/i915/i915_drv.c:398
> > gen6_gt_check_fifodbg.isra.6+0x31/0x43()
> > [ 164.098126] Hardware name: 1141ALG
> > [ 164.098128] MMIO read or write has been dropped ffffffff
> > [ 164.098129] Modules linked in: xt_tcpudp xt_limit xt_state iptable_filter
> > nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack ip_tables x_tables bnep rfcomm
> > bluetooth uinput fuse loop sha256_generic aes_x86_64 aes_generic cbc dm_crypt
> > dm_mod uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev
> > usbhid hid media snd_hda_codec_hdmi snd_hda_codec_conexant arc4 iwlwifi
> > mac80211 thinkpad_acpi cfg80211 coretemp nvram snd_hda_intel snd_hda_codec
> > snd_hwdep snd_pcm snd_page_alloc snd_seq ehci_hcd sdhci_pci crc32c_intel
> > iTCO_wdt iTCO_vendor_support ghash_clmulni_intel snd_seq_device cryptd
> > snd_timer microcode snd acpi_cpufreq mperf usbcore psmouse sdhci r8169
> > mmc_core mii ac rfkill i2c_i801 soundcore mei(C) serio_raw pcspkr thermal
> > battery power_supply wmi usb_common evdev processor
> > [ 164.098188] Pid: 4684, comm: kworker/u:9 Tainted: G C 3.4.0-rc3
> > #1
> > [ 164.098189] Call Trace:
> > [ 164.098197] [<ffffffff8103aa3c>] warn_slowpath_common+0x7e/0x96
> > [ 164.098200] [<ffffffff8103aae8>] warn_slowpath_fmt+0x41/0x43
> > [ 164.098203] [<ffffffff812cbec7>] gen6_gt_check_fifodbg.isra.6+0x31/0x43
> > [ 164.098207] [<ffffffff812cc13b>] __gen6_gt_force_wake_put+0x19/0x1b
> > [ 164.098210] [<ffffffff812cc3cf>] i915_read32+0x66/0x9d
> > [ 164.098213] [<ffffffff812ce4fa>] i915_update_gfx_val+0x61/0xb9
> > [ 164.098218] [<ffffffff812e989f>] intel_idle_update+0x47/0x18d
> > [ 164.098222] [<ffffffff810520d7>] process_one_work+0x1b5/0x340
> > [ 164.098225] [<ffffffff8105203a>] ? process_one_work+0x118/0x340
> > [ 164.098228] [<ffffffff812e9858>] ? intel_disable_plane+0x60/0x60
> > [ 164.098231] [<ffffffff81052c63>] worker_thread+0xce/0x152
> > [ 164.098234] [<ffffffff81052b95>] ? manage_workers.isra.22+0x16a/0x16a
> > [ 164.098237] [<ffffffff810567c6>] kthread+0xa1/0xa9
> > [ 164.098242] [<ffffffff81080ea1>] ? trace_hardirqs_on+0xd/0xf
> > [ 164.098246] [<ffffffff8145d374>] kernel_thread_helper+0x4/0x10
> > [ 164.098250] [<ffffffff81456970>] ? retint_restore_args+0x13/0x13
> > [ 164.098253] [<ffffffff81056725>] ? __init_kthread_worker+0x55/0x55
> > [ 164.098256] [<ffffffff8145d370>] ? gs_change+0x13/0x13
> > [ 164.098257] ---[ end trace 97bd0b679d161c3e ]---
> > [ 164.098827] ------------[ cut here ]------------
> > [ 164.098830] WARNING: at drivers/gpu/drm/i915/i915_drv.c:398
> > gen6_gt_check_fifodbg.isra.6+0x31/0x43()
> > [ 164.098832] Hardware name: 1141ALG
> > [ 164.098833] MMIO read or write has been dropped ffffffff
> > [ 164.098834] Modules linked in: xt_tcpudp xt_limit xt_state iptable_filter
> > nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack ip_tables x_tables bnep rfcomm
> > bluetooth uinput fuse loop sha256_generic aes_x86_64 aes_generic cbc dm_crypt
> > dm_mod uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev
> > usbhid hid media snd_hda_codec_hdmi snd_hda_codec_conexant arc4 iwlwifi
> > mac80211 thinkpad_acpi cfg80211 coretemp nvram snd_hda_intel snd_hda_codec
> > snd_hwdep snd_pcm snd_page_alloc snd_seq ehci_hcd sdhci_pci crc32c_intel
> > iTCO_wdt iTCO_vendor_support ghash_clmulni_intel snd_seq_device cryptd
> > snd_timer microcode snd acpi_cpufreq mperf usbcore psmouse sdhci r8169
> > mmc_core mii ac rfkill i2c_i801 soundcore mei(C) serio_raw pcspkr thermal
> > battery power_supply wmi usb_common evdev processor
> > [ 164.098877] Pid: 4684, comm: kworker/u:9 Tainted: G WC 3.4.0-rc3
> > #1
> > [ 164.098878] Call Trace:
> > [ 164.098881] [<ffffffff8103aa3c>] warn_slowpath_common+0x7e/0x96
> > [ 164.098884] [<ffffffff8103aae8>] warn_slowpath_fmt+0x41/0x43
> > [ 164.098888] [<ffffffff812cbec7>] gen6_gt_check_fifodbg.isra.6+0x31/0x43
> > [ 164.098891] [<ffffffff812cc13b>] __gen6_gt_force_wake_put+0x19/0x1b
> > [ 164.098894] [<ffffffff812cc3cf>] i915_read32+0x66/0x9d
> > [ 164.098896] [<ffffffff812e98f7>] intel_idle_update+0x9f/0x18d
> > [ 164.098899] [<ffffffff810520d7>] process_one_work+0x1b5/0x340
> > [ 164.098902] [<ffffffff8105203a>] ? process_one_work+0x118/0x340
> > [ 164.098904] [<ffffffff812e9858>] ? intel_disable_plane+0x60/0x60
> > [ 164.098907] [<ffffffff81052c63>] worker_thread+0xce/0x152
> > [ 164.098910] [<ffffffff81052b95>] ? manage_workers.isra.22+0x16a/0x16a
> > [ 164.098913] [<ffffffff810567c6>] kthread+0xa1/0xa9
> > [ 164.098916] [<ffffffff81080ea1>] ? trace_hardirqs_on+0xd/0xf
> > [ 164.098918] [<ffffffff8145d374>] kernel_thread_helper+0x4/0x10
> > [ 164.098921] [<ffffffff81456970>] ? retint_restore_args+0x13/0x13
> > [ 164.098925] [<ffffffff81056725>] ? __init_kthread_worker+0x55/0x55
> > [ 164.098927] [<ffffffff8145d370>] ? gs_change+0x13/0x13
> > [ 164.098928] ---[ end trace 97bd0b679d161c3f ]---
> >
> > I found similar report in:
> > https://bugzilla.redhat.com/show_bug.cgi?id=809773
> >
> > Dmesg, config and lspci:
> > http://mrutecki.pl/download/kernel/3.4-rc3/dri_intel/
>
> Can you please take these files and create a bug report at
> bugs.freedesktop.org. Also, is there anything going wrong besides these
> error message while you do a suspend cycle?
>
> I'm asking because we newly added this error message to catch potential
> issues, but without anything else going wrong it's not a regression.

Actually no bug report required, Ben Widawsky already stumbled over this
issue:

https://bugs.freedesktop.org/show_bug.cgi?id=49025

So if you don't see any other bad side-effects than the WARN backtrace, I
guess we don't need another bug report.
-Daniel
--
Daniel Vetter
Mail: daniel@xxxxxxxx
Mobile: +41 (0)79 365 57 48
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