BUG in i8xx_enable_fbc: unable to handle kernel paging request

BUG in i8xx_enable_fbc: unable to handle kernel paging request

[Thiemo Nagel]

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Hello,

I hope this goes to the correct mailing list:

I've observed a freeze today in i8xx_enable_fbc(), module i915 with 
vanilla Linux 2.6.32.5 running on my Eee PC 1000HG.  Kernel log and 
config is attached.

Strangely, this happend just the instant I was going out of scope of 
wifi hotspot.  Could be coincidence...

If you need some more information, just ask.

Cheers!

Thiemo Nagel

[-- Attachment #2: kern.log --]
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[37213.532161] No probe response from AP 00:03:52:af:ae:d3 after 500ms, disconnecting.
[37214.659548] ath5k phy1: noise floor calibration timeout (2437MHz)
[37214.730866] ath5k phy1: failed to wakeup the MAC Chip
[37215.020565] ath5k 0000:01:00.0: PCI INT A disabled
[37271.867837] BUG: unable to handle kernel paging request at 1b05083a
[37271.867864] IP: [<f8395032>] i8xx_enable_fbc+0xba/0x12e [i915]
[37271.867917] *pde = 00000000 
[37271.867929] Oops: 0002 [#1] PREEMPT SMP 
[37271.867947] last sysfs file: /sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda6/stat
[37271.867961] Modules linked in: ufs ntfs vfat msdos fat ext4 jbd2 ext2 usblp ath5k mac80211 ath nfs lockd nfs_acl auth_rpcgss sunrpc ppp_deflate zlib_deflate bsd_comp ppp_async crc_ccitt ppp_generic slhc i915 drm_kms_helper drm i2c_algo_bit sco bnep rfcomm l2cap crc16 bluetooth acpi_cpufreq cpufreq_conservative cpufreq_powersave cpufreq_userspace cpufreq_stats binfmt_misc fuse loop snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_timer uvcvideo snd_seq_device videodev option snd v4l1_compat usbserial eeepc_laptop rtc_cmos soundcore intel_agp usb_storage uhci_hcd rtc_core atl1e rng_core psmouse pci_hotplug evdev ehci_hcd rtc_lib battery ac snd_page_alloc agpgart button processor sha256_generic dm_c
 rypt dm_mod sd_mod thermal fan ata_generic ata_piix libata
[37271.868023] 
[37271.868023] Pid: 2783, comm: Xorg Not tainted (2.6.32.5 #9) 1000HG
[37271.868023] EIP: 0060:[<f8395032>] EFLAGS: 00213282 CPU: 0
[37271.868023] EIP is at i8xx_enable_fbc+0xba/0x12e [i915]
[37271.868023] EAX: f71bf800 EBX: fffffff7 ECX: 00000000 EDX: f660cc00
[37271.868023] ESI: f6a43800 EDI: 00000001 EBP: ef54fe70 ESP: ef54fe4c
[37271.868023]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[37271.868023] Process Xorg (pid: 2783, ti=ef54e000 task=f6b1a3a0 task.ti=ef54e000)
[37271.868023] Stack:
[37271.868023]  f838c444 f71bf800 ef533000 f71bf82c f660cc00 00000001 ef54fe84 0000005f
[37271.868023] <0> 400c645f ef54ff10 f817f7c2 f6af5240 f71bf800 f838c3af 0000010c 00000001
[37271.868023] <0> 00000001 f6b1a3a0 ef54ff34 c1053aac ffffffff 00000000 0000011c f6b1a870
[37271.868023] Call Trace:
[37271.868023]  [<f838c444>] ? i915_gem_set_domain_ioctl+0x95/0x11f [i915]
[37271.868023]  [<f817f7c2>] ? drm_ioctl+0x209/0x289 [drm]
[37271.868023]  [<f838c3af>] ? i915_gem_set_domain_ioctl+0x0/0x11f [i915]
[37271.868023]  [<c1053aac>] ? __lock_acquire+0xbdd/0xbec
[37271.868023]  [<c128371b>] ? _spin_unlock_irq+0x22/0x4a
[37271.868023]  [<c1053cdc>] ? lock_release_non_nested+0x84/0x1db
[37271.868023]  [<c105262b>] ? trace_hardirqs_on_caller+0xee/0x12f
[37271.868023]  [<c10c08e9>] ? vfs_ioctl+0x4e/0x67
[37271.868023]  [<c10c0e66>] ? do_vfs_ioctl+0x4c0/0x4fb
[37271.868023]  [<c109d338>] ? might_fault+0x6e/0x88
[37271.868023]  [<c10c0ee1>] ? sys_ioctl+0x40/0x5a
[37271.868023]  [<c1002fa4>] ? sysenter_do_call+0x12/0x32
[37271.868023] Code: fa c4 33 00 00 75 ec 31 d2 83 7d e0 00 0f 95 c2 8b 4d f0 83 79 44 00 74 03 83 ca 02 8b 43 08 05 14 32 00 00 89 10 8b 97 ec 00 00 <00> 8b 43 08 05 1b 32 00 00 89 10 8b 83 d0 01 00 00 0f b6 d0 c1 
[37271.868023] EIP: [<f8395032>] i8xx_enable_fbc+0xba/0x12e [i915] SS:ESP 0068:ef54fe4c
[37271.868023] CR2: 000000001b05083a
[37271.869239] ---[ end trace b5a54e5afe0b579f ]---
[37330.495914] pci 0000:01:00.0: reg 10 64bit mmio: [0x000000-0x00ffff]
[37330.497880] ath5k 0000:01:00.0: enabling device (0000 -> 0002)
[37330.497943] ath5k 0000:01:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
[37330.498120] ath5k 0000:01:00.0: setting latency timer to 64
[37330.498427] ath5k 0000:01:00.0: registered as 'phy2'
[37331.020574] ath: EEPROM regdomain: 0x60
[37331.020588] ath: EEPROM indicates we should expect a direct regpair map
[37331.020602] ath: Country alpha2 being used: 00
[37331.020609] ath: Regpair used: 0x60
[37331.022552] phy2: Selected rate control algorithm 'minstrel'
[37331.033416] Registered led device: ath5k-phy2::rx
[37331.035734] Registered led device: ath5k-phy2::tx
[37331.035761] ath5k phy2: Atheros AR2425 chip found (MAC: 0xe2, PHY: 0x70)
[37331.960650] ath5k 0000:01:00.0: PCI INT A disabled
[37406.537743] SysRq : Keyboard mode set to system default
[37408.373714] SysRq : Emergency Remount R/O

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