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[Bug 1566726] Re: System freeze after update to 3.16.0-69-generic [NULL pointer reference in radeon_fence_ref]


Kamal's build resolves the problem on one of our machines, I'll test the
other one once the package is in proposed.

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  System freeze after update to 3.16.0-69-generic [NULL pointer
  reference in radeon_fence_ref]

Status in linux package in Ubuntu:
  In Progress
Status in linux-lts-utopic package in Ubuntu:
  Fix Committed

Bug description:
  So far I've seen this happen on 2 systems today. On one only X froze, the other one panicked.
  Booting into 3.16.0-67 is the workaround for now

  ProblemType: KernelOops
  Annotation: Your system might become unstable now and might need to be restarted.
  Date: Wed Apr  6 09:57:21 2016
  Failure: oops
   BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
   IP: [<ffffffffc03b23ed>] radeon_fence_ref+0xd/0x50 [radeon]
   PGD 0
   Oops: 0002 [#1] SMP
   Modules linked in: xt_nat xt_tcpudp veth xt_conntrack ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter ip_tables x_tables nf_nat nf_conntrack bridge stp llc aufs arc4 md4 pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) rfcomm bnep bluetooth 6lowpan_iphc nls_utf8 cifs binfmt_misc fscache snd_hda_codec_via snd_hda_codec_generic radeon snd_hda_codec_hdmi snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep joydev snd_pcm snd_seq_midi ttm snd_seq_midi_event drm_kms_helper drm snd_rawmidi snd_seq i2c_algo_bit snd_seq_device kvm snd_timer snd ppdev serio_raw soundcore shpchp lp edac_core edac_mce_amd i2c_nforce2 mac_hid parport_pc asus_atk0110 k10temp parport hid_cherry hid_generic usbhid pata_acpi hid psmouse sata_nv forcedeth pata_amd
   CPU: 1 PID: 1543 Comm: Xorg Tainted: G           OE 3.16.0-69-generic #89~14.04.1-Ubuntu
   Hardware name: System manufacturer System Product Name/M4N68T-M-V2, BIOS 0501    08/03/2010
   task: ffff8800b9b45bb0 ti: ffff8800b9e28000 task.ti: ffff8800b9e28000
   RIP: 0010:[<ffffffffc03b23ed>]  [<ffffffffc03b23ed>] radeon_fence_ref+0xd/0x50 [radeon]
   RSP: 0018:ffff8800b9e2bad0  EFLAGS: 00010286
   RAX: 0000000000000000 RBX: ffff880035cf55f8 RCX: ffff880035cf4000
   RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000
   RBP: ffff8800b9e2bbd0 R08: ffff880035cf4d08 R09: ffff880035cf4000
   R10: 0000000000000000 R11: ffff8800b9e2bde8 R12: ffff880035cf5550
   R13: ffff8800b9e2bba8 R14: ffff8800b9e2bb78 R15: 0000000000000020
   FS:  00007f6e2ab398c0(0000) GS:ffff8801bfc40000(0000) knlGS:0000000000000000
   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
   CR2: 0000000000000008 CR3: 00000000b8192000 CR4: 00000000000007e0
    ffffffffc0414ad4 ffff8800b9b45bb0 ffff8800b9b45bb0 ffff880035cf4000
    ffff8800b9e2bca8 0000edc0b9e2bb90 0000000000000000 0020000000000100
    000000000004a8e0 ffff8800b9e2bb78 0000000000000000 0000000000000000
   Call Trace:
    [<ffffffffc0414ad4>] ? radeon_sa_bo_new+0x2b4/0x4f0 [radeon]
    [<ffffffff8118fc68>] ? insert_pfn.isra.61+0x48/0xa0
    [<ffffffffc03c7f43>] radeon_ib_get+0x33/0xe0 [radeon]
    [<ffffffffc03ca67b>] radeon_cs_ioctl+0x14b/0x770 [radeon]
    [<ffffffffc02be9ec>] drm_ioctl+0x1ec/0x660 [drm]
    [<ffffffff8105bfbc>] ? __do_page_fault+0x20c/0x560
    [<ffffffffc039604b>] radeon_drm_ioctl+0x4b/0x80 [radeon]
    [<ffffffff811e8d80>] do_vfs_ioctl+0x2e0/0x4c0
    [<ffffffff811e8fe1>] SyS_ioctl+0x81/0xa0
    [<ffffffff8177258d>] system_call_fastpath+0x1a/0x1f
   Code: dc 48 8b 3b 89 c1 44 89 e2 48 c7 c6 70 66 4a c0 31 c0 e8 d7 75 10 c1 eb c2 0f 1f 44 00 00 66 66 66 66 90 48 89 f8 ba 01 00 00 00 <f0> 0f c1 57 08 83 c2 01 83 fa 01 7e 01 c3 80 3d 5e 8b 11 00 00
   RIP  [<ffffffffc03b23ed>] radeon_fence_ref+0xd/0x50 [radeon]
    RSP <ffff8800b9e2bad0>
   CR2: 0000000000000008
   ---[ end trace 4dfa7ee83f5a67e2 ]---

  Package: linux-image-3.16.0-69-generic 3.16.0-69.89~14.04.1
  SourcePackage: linux
  Tags: kernel-oops
  Uname: Linux 3.16.0-69-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
   adduser 3.113+nmu3ubuntu3
   apt-utils 1.0.1ubuntu2.11
   base-passwd 3.5.33
   busybox-initramfs 1:1.21.0-1ubuntu1
   coreutils 8.21-1ubuntu5.4
   cpio 2.11+dfsg-1ubuntu1.2
   dbus 1.6.18-0ubuntu4.3
   debconf 1.5.51ubuntu2
   debconf-i18n 1.5.51ubuntu2
   debianutils 4.4
   dmsetup 2:1.02.77-6ubuntu2
   dpkg 1.17.5ubuntu5.5
   e2fslibs 1.42.9-3ubuntu1.3
   e2fsprogs 1.42.9-3ubuntu1.3
   findutils 4.4.2-7
   gcc-4.8-base 4.8.4-2ubuntu1~14.04.1
   gcc-4.9-base 4.9.3-0ubuntu4
   grub-common 2.02~beta2-9ubuntu1.7
   grub-gfxpayload-lists 0.6
   grub-pc 2.02~beta2-9ubuntu1.7
   grub-pc-bin 2.02~beta2-9ubuntu1.7
   grub2-common 2.02~beta2-9ubuntu1.7
   initramfs-tools 0.103ubuntu4.3
   initramfs-tools-bin 0.103ubuntu4.3
   initscripts 2.88dsf-41ubuntu6.3
   insserv 1.14.0-5ubuntu2
   iproute2 3.12.0-2ubuntu1
   isc-dhcp-client 4.2.4-7ubuntu12.4
   isc-dhcp-common 4.2.4-7ubuntu12.4
   klibc-utils 2.0.3-0ubuntu1
   kmod 15-0ubuntu6
   libacl1 2.2.52-1
   libapparmor1 2.8.95~2430-0ubuntu5.3
   libapt-inst1.5 1.0.1ubuntu2.11
   libapt-pkg4.12 1.0.1ubuntu2.11
   libattr1 1:2.4.47-1ubuntu1
   libaudit-common 1:2.3.2-2ubuntu1
   libaudit1 1:2.3.2-2ubuntu1
   libblkid1 2.20.1-5.1ubuntu20.7
   libbz2-1.0 1.0.6-5
   libc6 2.19-0ubuntu6.7
   libcap2 1:2.24-0ubuntu2
   libcgmanager0 0.24-0ubuntu7.5
   libcomerr2 1.42.9-3ubuntu1.3
   libdb5.3 5.3.28-3ubuntu3
   libdbus-1-3 1.6.18-0ubuntu4.3
   libdebconfclient0 0.187ubuntu1
   libdevmapper1.02.1 2:1.02.77-6ubuntu2
   libdrm2 2.4.64-1~ubuntu14.04.1
   libexpat1 2.1.0-4ubuntu1.1
   libfreetype6 2.5.2-1ubuntu2.5
   libfuse2 2.9.2-4ubuntu4.14.04.1
   libgcc1 1:4.9.3-0ubuntu4
   libgpm2 1.20.4-6.1
   libjson-c2 0.11-4+deb.sury.org~trusty+2 [origin: LP-PPA-ondrej-php5-5.6]
   libjson0 0.11-4+deb.sury.org~trusty+2 [origin: LP-PPA-ondrej-php5-5.6]
   libklibc 2.0.3-0ubuntu1
   libkmod2 15-0ubuntu6
   liblocale-gettext-perl 1.05-7build3
   liblzma5 5.1.1alpha+20120614-2ubuntu2
   libmount1 2.20.1-5.1ubuntu20.7
   libncurses5 5.9+20140118-1ubuntu1
   libncursesw5 5.9+20140118-1ubuntu1
   libnih-dbus1 1.0.3-4ubuntu25
   libnih1 1.0.3-4ubuntu25
   libpam-modules 1.1.8-1ubuntu2.2
   libpam-modules-bin 1.1.8-1ubuntu2.2
   libpam-runtime 1.1.8-1ubuntu2.2
   libpam-systemd 204-5ubuntu20.18
   libpam0g 1.1.8-1ubuntu2.2
   libpcre3 1:8.31-2ubuntu2.2
   libplymouth2 0.8.8-0ubuntu17.1
   libpng12-0 1.2.50-1ubuntu2.14.04.2
   libprocps3 1:3.3.9-1ubuntu2.2
   libselinux1 2.2.2-1ubuntu0.1
   libsemanage-common 2.2-1
   libsemanage1 2.2-1
   libsepol1 2.2-1ubuntu0.1
   libslang2 2.2.4-15ubuntu1
   libss2 1.42.9-3ubuntu1.3
   libstdc++6 4.8.4-2ubuntu1~14.04.1
   libsystemd-daemon0 204-5ubuntu20.18
   libsystemd-login0 204-5ubuntu20.18
   libtext-charwidth-perl 0.04-7build3
   libtext-iconv-perl 1.7-5build2
   libtext-wrapi18n-perl 0.06-7
   libtinfo5 5.9+20140118-1ubuntu1
   libudev1 204-5ubuntu20.18
   libustr-1.0-1 1.0.4-3ubuntu2
   libuuid1 2.20.1-5.1ubuntu20.7
   libxtables10 1.4.21-1ubuntu1
   lsb-base 4.1+Debian11ubuntu6
   makedev 2.3.1-93ubuntu1
   module-init-tools 15-0ubuntu6
   mount 2.20.1-5.1ubuntu20.7
   mountall 2.53
   multiarch-support 2.19-0ubuntu6.7
   netbase 5.2
   os-prober 1.63ubuntu1.1
   passwd 1:
   perl-base 5.18.2-2ubuntu1.1
   plymouth 0.8.8-0ubuntu17.1
   plymouth-theme-ubuntu-text 0.8.8-0ubuntu17.1
   procps 1:3.3.9-1ubuntu2.2
   psmisc 22.20-1ubuntu2
   sensible-utils 0.0.9
   systemd-services 204-5ubuntu20.18
   sysv-rc 2.88dsf-41ubuntu6.3
   sysvinit-utils 2.88dsf-41ubuntu6.3
   tar 1.27.1-1
   tzdata 2016c-0ubuntu0.14.04
   ucf 3.0027+nmu1
   udev 204-5ubuntu20.18
   upstart 1.12.1-0ubuntu4.2
   util-linux 2.20.1-5.1ubuntu20.7
   uuid-runtime 2.20.1-5.1ubuntu20.7
   zlib1g 1:1.2.8.dfsg-1ubuntu1
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2015-10-19 (169 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 3.16.0-69.89~14.04.1-generic 3.16.7-ckt25
  Title: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
  UpgradeStatus: No upgrade log present (probably fresh install)
  _MarkForUpload: True

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