[Regression][3.4-rc3][intel-dri] MMIO read or write has been dropped ffffffff

Sat Apr 21 12:24:06 PDT 2012

On sobota, 21 kwietnia 2012 o 15:13:52 Daniel Vetter wrote:
> 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

After resume I do not see any problems. This error I noticed by accident: 
because I look to the logs in test kernels regularly.

Regards
-- 
Maciej Rutecki
http://www.mrutecki.pl