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Date:	Thu, 19 Jun 2014 14:45:07 +0200
From:	Konrad Zapalowicz <bergo.torino@...il.com>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	"Nikula, Jani" <jani.nikula@...ux.intel.com>,
	Dave Airlie <airlied@...ux.ie>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/i915: Fix unnoticed failure of init_ring_common()

On 06/19, Daniel Vetter wrote:
> On Thu, Jun 19, 2014 at 12:38 AM, Konrad Zapalowicz
> <bergo.torino@...il.com> wrote:
> > This commit add check for return value of init_ring_common() in the
> > init_render_ring(). Now, when failure is detected the error code is
> > propagated to the caller layer instead of being ignored.
> >
> > I believe that this fix will have a positive impact on the oops that
> > I hit recently and which starts when init_ring_common() fails:
> >
> >     [drm:init_ring_common] *ERROR* render ring initialization failed
> >              ctl 0001f001 head 0000000c tail 00000000 start 003eb000
> >     BUG: unable to handle kernel NULL pointer dereference at 0000006c
> >     IP: [<f8ca1679>] i915_gem_obj_to_ggtt+0x9/0x40 [i915]
> >
> > Signed-off-by: Konrad Zapalowicz <bergo.torino@...il.com>
> 
> Do you have the full Oops somewhere?

Here you go, the Oops plus some usefull data:
  1. Oops
  2. lspci -vv
  3. uname -a
  4. Oops analysis

1. The Oops:

Jun 17 21:06:11 t400 kernel: [   12.136049] [drm:init_ring_common] *ERROR* render ring initialization failed ctl 0001f001 head 0000000c tail 00000000 start 003eb000
Jun 17 21:06:11 t400 kernel: [   12.136081] BUG: unable to handle kernel NULL pointer dereference at 0000006c
Jun 17 21:06:11 t400 kernel: [   12.136086] IP: [<f8ca1679>] i915_gem_obj_to_ggtt+0x9/0x40 [i915]
Jun 17 21:06:11 t400 kernel: [   12.136118] *pdpt = 0000000033158001 *pde = 0000000000000000 
Jun 17 21:06:11 t400 kernel: [   12.136123] Oops: 0000 [#1] SMP 
Jun 17 21:06:11 t400 kernel: [   12.136127] Modules linked in: mac80211(E) i915(E+) snd_hda_codec_conexant(E) snd_hda_codec_generic(E) snd_hda_intel(E) snd_hda_controller(E) intel_gtt(E) snd_hda_codec(E) iwlwifi(E) i2c_algo_bit(E) snd_hwdep(E) uvcvideo(E) thinkpad_acpi(E) drm_kms_helper(E) snd_pcm(E) pcmcia(E) nvram(E) videobuf2_vmalloc(E) videobuf2_memops(E) videobuf2_core(E) drm(E) psmouse(E) videodev(E) snd_seq_midi(E) snd_seq_midi_event(E) snd_rawmidi(E) snd_seq(E) cfg80211(E) yenta_socket(E) snd_timer(E) pcmcia_rsrc(E) serio_raw(E) snd_seq_device(E) pcmcia_core(E) snd(E) pl2303(E) lpc_ich(E) ppdev(E) usb_storage(E) soundcore(E) usbserial(E) wmi(E) video(E) tpm_tis(E) parport_pc(E) lp(E) parport(E) firewire_ohci(E) firewire_core(E) crc_itu_t(E) ahci(E) libahci(E) e1000e(E) ptp(E) pps_core(E)
Jun 17 21:06:11 t400 kernel: [   12.136187] CPU: 1 PID: 570 Comm: modprobe Tainted: G            E 3.15.0 #6
Jun 17 21:06:11 t400 kernel: [   12.136191] Hardware name: LENOVO 6475FA4/6475FA4, BIOS 7UET79WW (3.09 ) 10/13/2009
Jun 17 21:06:11 t400 kernel: [   12.136195] task: f3141b60 ti: f316a000 task.ti: f316a000
Jun 17 21:06:11 t400 kernel: [   12.136199] EIP: 0060:[<f8ca1679>] EFLAGS: 00010282 CPU: 1
Jun 17 21:06:11 t400 kernel: [   12.136223] EIP is at i915_gem_obj_to_ggtt+0x9/0x40 [i915]
Jun 17 21:06:11 t400 kernel: [   12.136227] EAX: 00000000 EBX: 00000004 ECX: f2e6c000 EDX: fffffffb
Jun 17 21:06:11 t400 kernel: [   12.136230] ESI: f2e6d174 EDI: 00000000 EBP: f316bb50 ESP: f316bb4c
Jun 17 21:06:11 t400 kernel: [   12.136234]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Jun 17 21:06:11 t400 kernel: [   12.136239] CR0: 8005003b CR2: 0000006c CR3: 33157000 CR4: 000407f0
Jun 17 21:06:11 t400 kernel: [   12.136243] Stack:
Jun 17 21:06:11 t400 kernel: [   12.136245]  00000004 f316bb68 f8ca16c5 f316bb80 00000004 f2e6d174 f2e794c0 f316bb80
Jun 17 21:06:11 t400 kernel: [   12.136254]  f8c9473e f2e6c000 f2e6c000 f32e5800 fffffffb f316bba0 f8c9ea49 00000000
Jun 17 21:06:11 t400 kernel: [   12.136263]  00000000 f32e5838 f32e5800 00000000 f2e6c000 f316bca4 f8cf63a4 f8cf3c70
Jun 17 21:06:11 t400 kernel: [   12.136271] Call Trace:
Jun 17 21:06:11 t400 kernel: [   12.136297]  [<f8ca16c5>] i915_gem_object_ggtt_unpin+0x15/0x90 [i915]
Jun 17 21:06:11 t400 kernel: [   12.136323]  [<f8c9473e>] i915_gem_context_fini+0x7e/0x130 [i915]
Jun 17 21:06:11 t400 kernel: [   12.136349]  [<f8c9ea49>] i915_gem_init+0x69/0x1a0 [i915]
Jun 17 21:06:11 t400 kernel: [   12.136381]  [<f8cf63a4>] i915_driver_load+0xa54/0xe50 [i915]
Jun 17 21:06:11 t400 kernel: [   12.136411]  [<f8cf3c70>] ? i915_dma_init+0x2e0/0x2e0 [i915]
Jun 17 21:06:11 t400 kernel: [   12.136419]  [<c12ed1da>] ? kobject_uevent_env+0xfa/0x510
Jun 17 21:06:11 t400 kernel: [   12.136424]  [<c12ed1da>] ? kobject_uevent_env+0xfa/0x510
Jun 17 21:06:11 t400 kernel: [   12.136429]  [<c12ed050>] ? add_uevent_var+0xd0/0xd0
Jun 17 21:06:11 t400 kernel: [   12.136435]  [<c13d11b4>] ? get_device+0x14/0x30
Jun 17 21:06:11 t400 kernel: [   12.136440]  [<c13d5a92>] ? klist_class_dev_get+0x12/0x20
Jun 17 21:06:11 t400 kernel: [   12.136447]  [<c15f34c5>] ? klist_node_init+0x35/0x50
Jun 17 21:06:11 t400 kernel: [   12.136452]  [<c15f35a0>] ? klist_add_tail+0x20/0x50
Jun 17 21:06:11 t400 kernel: [   12.136457]  [<c13d1204>] ? put_device+0x14/0x20
Jun 17 21:06:11 t400 kernel: [   12.136462]  [<c13d27d7>] ? device_add+0x167/0x530
Jun 17 21:06:11 t400 kernel: [   12.136468]  [<c12ec522>] ? kobject_set_name_vargs+0x42/0x60
Jun 17 21:06:11 t400 kernel: [   12.136485]  [<f89ed12e>] drm_dev_register+0x9e/0xf0 [drm]
Jun 17 21:06:11 t400 kernel: [   12.136499]  [<f89eee2f>] drm_get_pci_dev+0x6f/0x1e0 [drm]
Jun 17 21:06:11 t400 kernel: [   12.136521]  [<f8c7f325>] i915_pci_probe+0x35/0x60 [i915]
Jun 17 21:06:11 t400 kernel: [   12.136528]  [<c131f489>] pci_device_probe+0x79/0xc0
Jun 17 21:06:11 t400 kernel: [   12.136534]  [<c11c3cd5>] ? sysfs_create_link+0x25/0x40
Jun 17 21:06:11 t400 kernel: [   12.136540]  [<c13d4f04>] driver_probe_device+0x64/0x200
Jun 17 21:06:11 t400 kernel: [   12.136545]  [<c131f3ce>] ? pci_match_device+0x9e/0xb0
Jun 17 21:06:11 t400 kernel: [   12.136550]  [<c13d5131>] __driver_attach+0x91/0xa0
Jun 17 21:06:11 t400 kernel: [   12.136555]  [<c13d50a0>] ? driver_probe_device+0x200/0x200
Jun 17 21:06:11 t400 kernel: [   12.136559]  [<c13d3752>] bus_for_each_dev+0x42/0x80
Jun 17 21:06:11 t400 kernel: [   12.136564]  [<c13d4a8e>] driver_attach+0x1e/0x20
Jun 17 21:06:11 t400 kernel: [   12.136569]  [<c13d50a0>] ? driver_probe_device+0x200/0x200
Jun 17 21:06:11 t400 kernel: [   12.136575]  [<c13d4714>] bus_add_driver+0xd4/0x1d0
Jun 17 21:06:11 t400 kernel: [   12.136580]  [<c13d5719>] driver_register+0x59/0xe0
Jun 17 21:06:11 t400 kernel: [   12.136585]  [<c131e8d3>] __pci_register_driver+0x33/0x40
Jun 17 21:06:11 t400 kernel: [   12.136590]  [<f8b7c000>] ? 0xf8b7bfff
Jun 17 21:06:11 t400 kernel: [   12.136603]  [<f89ef08d>] drm_pci_init+0xed/0x110 [drm]
Jun 17 21:06:11 t400 kernel: [   12.136609]  [<f8b7c000>] ? 0xf8b7bfff
Jun 17 21:06:11 t400 kernel: [   12.136630]  [<f8b7c062>] i915_init+0x62/0x64 [i915]
Jun 17 21:06:11 t400 kernel: [   12.136636]  [<c100048a>] do_one_initcall+0xda/0x120
Jun 17 21:06:11 t400 kernel: [   12.136641]  [<f8b7c000>] ? 0xf8b7bfff
Jun 17 21:06:11 t400 kernel: [   12.136646]  [<c103652f>] ? set_memory_nx+0x5f/0x70
Jun 17 21:06:11 t400 kernel: [   12.136653]  [<c15f7fbb>] ? set_section_ro_nx+0x54/0x59
Jun 17 21:06:11 t400 kernel: [   12.136659]  [<c10ae4bb>] load_module+0x1adb/0x21b0
Jun 17 21:06:11 t400 kernel: [   12.136667]  [<c160475a>] ? error_code+0x5a/0x60
Jun 17 21:06:11 t400 kernel: [   12.136672]  [<c10aec13>] SyS_init_module+0x83/0xb0
Jun 17 21:06:11 t400 kernel: [   12.136680]  [<c160b84c>] sysenter_do_call+0x12/0x22
Jun 17 21:06:11 t400 kernel: [   12.136684] Code: f8 e8 ec de 39 c8 e9 36 ff ff ff 66 ba 6d 09 b8 e0 8c d0 f8 e8 d9 de 39 c8 e9 ff fe ff ff 8d 74 26 00 55 89 e5 53 66 66 66 66 90 <8b> 50 6c 8d 48 6c 39 ca 74 1a 8b 40 08 8d 4a cc 8b 58 1c 31 c0
Jun 17 21:06:11 t400 kernel: [   12.136725] EIP: [<f8ca1679>] i915_gem_obj_to_ggtt+0x9/0x40 [i915] SS:ESP 0068:f316bb4c
Jun 17 21:06:11 t400 kernel: [   12.136752] CR2: 000000000000006c
Jun 17 21:06:11 t400 kernel: [   12.136757] ---[ end trace 3fff41670168a98f ]---

2. lspci -vv

00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
	Subsystem: Lenovo Device 20e0
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
	Latency: 0
	Capabilities: <access denied>

00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
	Subsystem: Lenovo Device 20e4
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 49
	Region 0: Memory at f4400000 (64-bit, non-prefetchable) [size=4M]
	Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
	Region 4: I/O ports at 1800 [size=8]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: <access denied>
	Kernel driver in use: i915

00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
	Subsystem: Lenovo Device 20e4
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Region 0: Memory at f4200000 (64-bit, non-prefetchable) [size=1M]
	Capabilities: <access denied>

00:03.0 Communication controller: Intel Corporation Mobile 4 Series Chipset MEI Controller (rev 07)
	Subsystem: Lenovo Device 20e6
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx+
	Latency: 0
	Interrupt: pin A routed to IRQ 11
	Region 0: Memory at fc326800 (64-bit, non-prefetchable) [size=16]
	Capabilities: <access denied>

00:03.3 Serial controller: Intel Corporation Mobile 4 Series Chipset AMT SOL Redirection (rev 07) (prog-if 02 [16550])
	Subsystem: Lenovo Device 20ec
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 17
	Region 0: I/O ports at 1830 [size=8]
	Region 1: Memory at fc324000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: <access denied>
	Kernel driver in use: serial

00:19.0 Ethernet controller: Intel Corporation 82567LM Gigabit Network Connection (rev 03)
	Subsystem: Lenovo Device 20ee
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 48
	Region 0: Memory at fc100000 (32-bit, non-prefetchable) [size=128K]
	Region 1: Memory at fc325000 (32-bit, non-prefetchable) [size=4K]
	Region 2: I/O ports at 1840 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: e1000e

00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03) (prog-if 00 [UHCI])
	Subsystem: Lenovo Device 20f0
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 20
	Region 4: I/O ports at 1860 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: uhci_hcd

00:1a.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03) (prog-if 00 [UHCI])
	Subsystem: Lenovo Device 20f0
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 21
	Region 4: I/O ports at 1880 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: uhci_hcd

00:1a.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03) (prog-if 00 [UHCI])
	Subsystem: Lenovo Device 20f0
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin C routed to IRQ 22
	Region 4: I/O ports at 18a0 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: uhci_hcd

00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03) (prog-if 20 [EHCI])
	Subsystem: Lenovo Device 20f1
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin D routed to IRQ 23
	Region 0: Memory at fc326c00 (32-bit, non-prefetchable) [size=1K]
	Capabilities: <access denied>
	Kernel driver in use: ehci-pci

00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
	Subsystem: Lenovo Device 20f2
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin B routed to IRQ 45
	Region 0: Memory at fc320000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: snd_hda_intel

00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
	I/O behind bridge: 00009000-00009fff
	Memory behind bridge: c0000000-c01fffff
	Prefetchable memory behind bridge: 00000000c0200000-00000000c03fffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
	I/O behind bridge: 0000a000-0000afff
	Memory behind bridge: f4300000-f43fffff
	Prefetchable memory behind bridge: 00000000c0400000-00000000c05fffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 (rev 03) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Bus: primary=00, secondary=04, subordinate=04, sec-latency=0
	I/O behind bridge: 00002000-00002fff
	Memory behind bridge: fc000000-fc0fffff
	Prefetchable memory behind bridge: 00000000c0600000-00000000c08fffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

00:1c.3 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 4 (rev 03) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Bus: primary=00, secondary=05, subordinate=0c, sec-latency=0
	I/O behind bridge: 00003000-00003fff
	Memory behind bridge: f8000000-f9ffffff
	Prefetchable memory behind bridge: 00000000f4000000-00000000f40fffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

00:1c.4 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5 (rev 03) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Bus: primary=00, secondary=0d, subordinate=14, sec-latency=0
	I/O behind bridge: 00004000-00004fff
	Memory behind bridge: fa000000-fbffffff
	Prefetchable memory behind bridge: 00000000f4100000-00000000f41fffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03) (prog-if 00 [UHCI])
	Subsystem: Lenovo Device 20f0
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 16
	Region 4: I/O ports at 18c0 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: uhci_hcd

00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03) (prog-if 00 [UHCI])
	Subsystem: Lenovo Device 20f0
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 17
	Region 4: I/O ports at 18e0 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: uhci_hcd

00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03) (prog-if 00 [UHCI])
	Subsystem: Lenovo Device 20f0
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin C routed to IRQ 18
	Region 4: I/O ports at 1c00 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: uhci_hcd

00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03) (prog-if 20 [EHCI])
	Subsystem: Lenovo Device 20f1
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin D routed to IRQ 19
	Region 0: Memory at fc327000 (32-bit, non-prefetchable) [size=1K]
	Capabilities: <access denied>
	Kernel driver in use: ehci-pci

00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93) (prog-if 01 [Subtractive decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Bus: primary=00, secondary=15, subordinate=18, sec-latency=32
	I/O behind bridge: 00005000-00008fff
	Memory behind bridge: f4800000-f7ffffff
	Prefetchable memory behind bridge: 00000000f0000000-00000000f3ffffff
	Secondary status: 66MHz- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>

00:1f.0 ISA bridge: Intel Corporation ICH9M-E LPC Interface Controller (rev 03)
	Subsystem: Lenovo Device 20f5
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Capabilities: <access denied>
	Kernel driver in use: lpc_ich

00:1f.2 SATA controller: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E) 4 port SATA Controller [AHCI mode] (rev 03) (prog-if 01 [AHCI 1.0])
	Subsystem: Lenovo Device 20f8
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 46
	Region 0: I/O ports at 1c48 [size=8]
	Region 1: I/O ports at 183c [size=4]
	Region 2: I/O ports at 1c40 [size=8]
	Region 3: I/O ports at 1838 [size=4]
	Region 4: I/O ports at 1c20 [size=32]
	Region 5: Memory at fc326000 (32-bit, non-prefetchable) [size=2K]
	Capabilities: <access denied>
	Kernel driver in use: ahci

00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
	Subsystem: Lenovo Device 20f9
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin A routed to IRQ 11
	Region 0: Memory at fc327400 (64-bit, non-prefetchable) [size=256]
	Region 4: I/O ports at 1c60 [size=32]

03:00.0 Network controller: Intel Corporation Ultimate N WiFi Link 5300
	Subsystem: Intel Corporation Device 1011
	Physical Slot: 1
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 47
	Region 0: Memory at f4300000 (64-bit, non-prefetchable) [size=8K]
	Capabilities: <access denied>
	Kernel driver in use: iwlwifi

04:00.0 Memory controller: Intel Corporation Turbo Memory Controller (rev 11)
	Subsystem: Intel Corporation Device 4443
	Physical Slot: 2
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 11
	Region 0: Memory at fc000000 (32-bit, non-prefetchable) [size=1K]
	Region 2: I/O ports at 2000 [size=256]
	[virtual] Expansion ROM at c0600000 [disabled] [size=64K]
	Capabilities: <access denied>

15:00.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev ba)
	Subsystem: Lenovo Device 20c6
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 168, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at f4800000 (32-bit, non-prefetchable) [size=4K]
	Bus: primary=15, secondary=16, subordinate=17, sec-latency=176
	Memory window 0: f0000000-f3ffffff (prefetchable)
	Memory window 1: c4000000-c7ffffff
	I/O window 0: 00005000-000050ff
	I/O window 1: 00005400-000054ff
	BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset- 16bInt+ PostWrite+
	16-bit legacy interface ports at 0001
	Kernel driver in use: yenta_cardbus

15:00.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 04) (prog-if 10 [OHCI])
	Subsystem: Lenovo Device 20c7
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 32 (500ns min, 1000ns max), Cache Line Size: 64 bytes
	Interrupt: pin B routed to IRQ 17
	Region 0: Memory at f4801000 (32-bit, non-prefetchable) [size=2K]
	Capabilities: <access denied>
	Kernel driver in use: firewire_ohci

3. uname

Linux t400 3.15.0 #6 SMP Sat Jun 14 21:07:35 CEST 2014 i686 i686 i686 GNU/Linux

4. Oops analysis

I have spent some time tracing down the source of the Oops. It turned
out that the failure is caused in list_empty() function which is used
by the i915_gem_obj_to_ggtt() function. The decoded code shows:

Code starting with the faulting instruction
===========================================
   0:   8b 50 6c                mov    0x6c(%eax),%edx <--- trapping
   3:   8d 48 6c                lea    0x6c(%eax),%ecx
   6:   39 ca                   cmp    %ecx,%edx
   8:   74 1a                   je     0x24
   a:   8b 40 08                mov    0x8(%eax),%eax
   d:   8d 4a cc                lea    -0x34(%edx),%ecx
  10:   8b 58 1c                mov    0x1c(%eax),%ebx
  13:   31 c0                   xor    %eax,%eax 

Now the 0x6c offset corresponds to the vma_list member of struct
drm_i915_gem_object.

(gdb) print &((struct drm_i915_gem_object *)0)->vma_list
$1 = (struct list_head *) 0x6c <i915_free_hws+92>

So the Oops is because the vma_list has not been initialized. I
suspect, although not 100% sure, that the ringbuffer error has
something to do with it.

/Konrad
 
> > ---
> >  drivers/gpu/drm/i915/intel_ringbuffer.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> > index 279488a..d205b0d 100644
> > --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> > +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> > @@ -604,6 +604,8 @@ static int init_render_ring(struct intel_engine_cs *ring)
> >         struct drm_device *dev = ring->dev;
> >         struct drm_i915_private *dev_priv = dev->dev_private;
> >         int ret = init_ring_common(ring);
> > +       if (ret)
> > +               return ret;
> 
> Yeah, on gen5+ this looks needed.
> -Daniel
> 
> >
> >         /* WaTimedSingleVertexDispatch:cl,bw,ctg,elk,ilk,snb */
> >         if (INTEL_INFO(dev)->gen >= 4 && INTEL_INFO(dev)->gen < 7)
> > --
> > 1.8.1.2
> >
> 
> 
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch
--
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