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I am seeing nouveau consistently crashing @ nouveau_object_decf on
logging out. On trying to restart the display manager, it hangs

[29140.815287] nouveau E[     I2C][0000:01:00.0] AUXCH(1): begin idle timeout 0xffffffff
[29140.816398] nouveau E[     I2C][0000:01:00.0] AUXCH(1): begin idle timeout 0xffffffff
[29140.817495] nouveau E[     I2C][0000:01:00.0] AUXCH(3): begin idle timeout 0xffffffff
[29140.819535] nouveau E[     I2C][0000:01:00.0] AUXCH(3): begin idle timeout 0xffffffff
[29140.821547] nouveau E[     I2C][0000:01:00.0] AUXCH(2): begin idle timeout 0xffffffff
[29140.823558] nouveau E[     I2C][0000:01:00.0] AUXCH(2): begin idle timeout 0xffffffff
[29264.387025] BUG: unable to handle kernel NULL pointer dereference at           (null)
[29264.387062] IP: [<          (null)>]           (null)
[29264.387081] PGD 0
[29264.387090] Oops: 0010 [#1] SMP
[29264.387105] Modules linked in: snd_hda_codec_hdmi intel_powerclamp coretemp lib80211_crypt_tkip kvm_intel kvm crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd joydev applesmc input_polldev snd_hda_codec_cirrus parport_pc ppdev uvcvideo snd_hda_intel wl(POF) microcode snd_hda_codec videobuf2_vmalloc videobuf2_memops snd_hwdep videobuf2_core snd_seq_midi bnep snd_seq_midi_event rfcomm videodev snd_rawmidi snd_pcm bluetooth bcm5974 snd_seq snd_page_alloc lib80211 lpc_ich cfg80211 mei_me mei snd_seq_device snd_timer snd apple_gmux soundcore apple_bl mac_hid binfmt_misc nls_iso8859_1 lp parport hid_apple nouveau mxm_wmi hid_generic i915 wmi sdhci_pci tg3 ttm ahci i2c_algo_bit sdhci usbhid drm_kms_helper libahci ptp hid drm pps_core video [last unloaded: btusb]
[29264.387428] CPU: 3 PID: 1337 Comm: Xorg Tainted: PF       W  O 3.10.2-031002-generic #201307212216
[29264.387460] Hardware name: Apple Inc. MacBookPro10,1/Mac-C3EC7CD22292981F, BIOS MBP101.88Z.00EE.B03.1212211437 12/21/2012
[29264.387498] task: ffff880452ea5dc0 ti: ffff8804570c2000 task.ti: ffff8804570c2000
[29264.387524] RIP: 0010:[<0000000000000000>]  [<          (null)>]           (null)
[29264.387551] RSP: 0018:ffff8804570c3af0  EFLAGS: 00010246
[29264.387570] RAX: ffffffffa02c0020 RBX: ffff88045717eb00 RCX: 00000000e0000000
[29264.387595] RDX: 0000000000000005 RSI: 0000000000000000 RDI: ffff88045717eb00
[29264.387620] RBP: ffff8804570c3b08 R08: 0000000000000000 R09: 00000000ffffffff
[29264.387645] R10: ffffffffa021cb37 R11: 0000000000000002 R12: 0000000000000001
[29264.387671] R13: 0000000000000000 R14: ffff880458354688 R15: 0000000000000000
[29264.387696] FS:  0000000000000000(0000) GS:ffff88046f2c0000(0000) knlGS:0000000000000000
[29264.387725] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[29264.387745] CR2: 0000000000000000 CR3: 0000000002c0d000 CR4: 00000000001407e0
[29264.387770] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[29264.387795] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[29264.387819] Stack:
[29264.387827]  ffffffffa01fb83a 0000000000000000 ffff88045717eb00 ffff8804570c3b38
[29264.387857]  ffffffffa01fb7dd ffff880458354670 ffff880458354670 0000000000000000
[29264.387885]  ffff880458354660 ffff8804570c3b98 ffffffffa01fa0db ffffffffa02b3c31
[29264.387913] Call Trace:
[29264.387939]  [<ffffffffa01fb83a>] ? nouveau_object_decf+0x3a/0xd0 [nouveau]
[29264.387972]  [<ffffffffa01fb7dd>] nouveau_object_dec+0x6d/0x90 [nouveau]
[29264.388005]  [<ffffffffa01fa0db>] nouveau_handle_fini+0x13b/0x2b0 [nouveau]
[29264.388039]  [<ffffffffa01f8221>] nouveau_client_fini+0x61/0xa0 [nouveau]
[29264.388081]  [<ffffffffa0271adf>] nouveau_cli_destroy+0x2f/0x50 [nouveau]
[29264.388119]  [<ffffffffa0271b99>] nouveau_drm_postclose+0x19/0x20 [nouveau]
[29264.388152]  [<ffffffffa001a0b0>] drm_release+0x340/0x520 [drm]
[29264.388176]  [<ffffffff811a1e9a>] __fput+0xba/0x240
[29264.388195]  [<ffffffff811a202e>] ____fput+0xe/0x10
[29264.388215]  [<ffffffff8107cda8>] task_work_run+0xc8/0xf0
[29264.388235]  [<ffffffff8105f6ae>] do_exit+0x19e/0x480
[29264.388256]  [<ffffffff810b919f>] ? __unqueue_futex+0x3f/0x80
[29264.388278]  [<ffffffff8106c4db>] ? __dequeue_signal+0x6b/0xb0
[29264.388299]  [<ffffffff8105fa24>] do_group_exit+0x44/0xa0
[29264.388320]  [<ffffffff8106f621>] get_signal_to_deliver+0x231/0x480
[29264.388345]  [<ffffffff81013bc7>] do_signal+0x47/0x140
[29264.388366]  [<ffffffff8109350c>] ? account_user_time+0x9c/0xb0
[29264.388387]  [<ffffffff81093b34>] ? vtime_account_user+0x74/0x90
[29264.388410]  [<ffffffff81013d48>] do_notify_resume+0x88/0xc0
[29264.388433]  [<ffffffff8172231a>] int_signal+0x12/0x17
[29264.388451] Code:  Bad RIP value.
[29264.388467] RIP  [<          (null)>]           (null)
[29264.388487]  RSP <ffff8804570c3af0>
[29264.388499] CR2: 0000000000000000
[29264.388525] ---[ end trace 4ca6bffe89780c0c ]---
[29264.388543] Fixing recursive fault but reboot is needed!

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: xorg 1:7.7+1ubuntu4
Uname: Linux 3.10.2-031002-generic x86_64
NonfreeKernelModules: wl
.tmp.unity.support.test.0:
 
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Fri Jul 26 14:16:04 2013
DistUpgraded: Fresh install
DistroCodename: raring
DistroVariant: ubuntu
DkmsStatus: bcmwl, 6.30.223.30+bdcom, 3.10.2-031002-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
GpuHangFrequency: Several times a day
GpuHangReproducibility: Yes, I can easily reproduce it
GpuHangStarted: Immediately after installing this version of Ubuntu
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Apple Inc. Device [106b:00f7]
 NVIDIA Corporation GK107M [GeForce GT 650M Mac Edition] [10de:0fd5] (rev ff) (prog-if ff)
InstallationDate: Installed on 2013-07-11 (14 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Apple Inc. MacBookPro10,1
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: ro root=/dev/sda4 initrd=\EFI\Ubuntu\initrd.img-3.10.2-031002-generic
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/21/2012
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP101.88Z.00EE.B03.1212211437
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-C3EC7CD22292981F
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro10,1
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-C3EC7CD22292981F
dmi.modalias: dmi:bvnAppleInc.:bvrMBP101.88Z.00EE.B03.1212211437:bd12/21/2012:svnAppleInc.:pnMacBookPro10,1:pvr1.0:rvnAppleInc.:rnMac-C3EC7CD22292981F:rvrMacBookPro10,1:cvnAppleInc.:ct10:cvrMac-C3EC7CD22292981F:
dmi.product.name: MacBookPro10,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
version.compiz: compiz 1:0.9.9~daily13.06.19~13.04-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.43-0ubuntu1.1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.1.4-0ubuntu0.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.1.4-0ubuntu0.1
version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.6-0ubuntu4.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.7-0ubuntu1
xserver.bootTime: Fri Jul 26 13:58:40 2013
xserver.configfile: default
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
 NOUVEAU(G0): [XvMC] Failed to initialize extension.
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.13.3-0ubuntu6
xserver.video_driver: intel

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Incomplete


** Tags: amd64 apport-bug compiz-0.9 freeze latest-bios-b03 raring ubuntu
-- 
Nouveau crashes at nouveau_object_decf on logout and system hangs on restarting lightdm
https://bugs.launchpad.net/bugs/1205329
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