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[Niels <niels@xxxxxxxxxx>]

Public bug reported:

X frequently freezes with "EQ overflowing" message(s) in the logs.
lightdm/X can be stopped and restarted, but never returns to a usable
state until rebooting. Either the screen remains black, or the input
devices remain frozen.

This happens multiple times a day but can not be reliably reproduced.
Frequently, it will happen within minutes after booting up; other times
it seems to happen at times of high load / memory usage. Sometimes the
system remains working for hours, sometimes just for minutes.

The problem occurs both with the xserver-xorg-video-ati and fglrx
drivers from the standard repositories (+ backports, + updates, +
security).

The system remains fully responsive via SSH, with seemingly no dangling
processes after stopping X.

Kernel 3.16.0-31-generic, amd64.
Release utopic.

Graphics card:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Juniper XT [Radeon HD 5770] (prog-if 00 [VGA controller])
        Subsystem: Gigabyte Technology Co., Ltd Device 21f6
        Flags: bus master, fast devsel, latency 0, IRQ 47
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Memory at fbcc0000 (64-bit, non-prefetchable) [size=128K]
        I/O ports at de00 [size=256]
        [virtual] Expansion ROM at fbc00000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
        Capabilities: [150] Advanced Error Reporting
        Kernel driver in use: radeon

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: xserver-xorg-core 2:1.16.0-1ubuntu1.3
ProcVersionSignature: Ubuntu 3.16.0-31.41-generic 3.16.7-ckt5
Uname: Linux 3.16.0-31-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.2
Architecture: amd64
Date: Fri Mar  6 10:38:17 2015
ExecutablePath: /usr/bin/Xorg
ProcEnviron:
 
SourcePackage: xorg-server
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug utopic

** Attachment added: "Xorg.1.log"
   https://bugs.launchpad.net/bugs/1429390/+attachment/4337070/+files/Xorg.1.log

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https://bugs.launchpad.net/bugs/1429390

Title:
  Xorg freezes irrecoverably with "EQ overflowing"

Status in xorg-server package in Ubuntu:
  New

Bug description:
  X frequently freezes with "EQ overflowing" message(s) in the logs.
  lightdm/X can be stopped and restarted, but never returns to a usable
  state until rebooting. Either the screen remains black, or the input
  devices remain frozen.

  This happens multiple times a day but can not be reliably reproduced.
  Frequently, it will happen within minutes after booting up; other
  times it seems to happen at times of high load / memory usage.
  Sometimes the system remains working for hours, sometimes just for
  minutes.

  The problem occurs both with the xserver-xorg-video-ati and fglrx
  drivers from the standard repositories (+ backports, + updates, +
  security).

  The system remains fully responsive via SSH, with seemingly no
  dangling processes after stopping X.

  Kernel 3.16.0-31-generic, amd64.
  Release utopic.

  Graphics card:

  01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Juniper XT [Radeon HD 5770] (prog-if 00 [VGA controller])
          Subsystem: Gigabyte Technology Co., Ltd Device 21f6
          Flags: bus master, fast devsel, latency 0, IRQ 47
          Memory at e0000000 (64-bit, prefetchable) [size=256M]
          Memory at fbcc0000 (64-bit, non-prefetchable) [size=128K]
          I/O ports at de00 [size=256]
          [virtual] Expansion ROM at fbc00000 [disabled] [size=128K]
          Capabilities: [50] Power Management version 3
          Capabilities: [58] Express Legacy Endpoint, MSI 00
          Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
          Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
          Capabilities: [150] Advanced Error Reporting
          Kernel driver in use: radeon

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: xserver-xorg-core 2:1.16.0-1ubuntu1.3
  ProcVersionSignature: Ubuntu 3.16.0-31.41-generic 3.16.7-ckt5
  Uname: Linux 3.16.0-31-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.2
  Architecture: amd64
  Date: Fri Mar  6 10:38:17 2015
  ExecutablePath: /usr/bin/Xorg
  ProcEnviron:
   
  SourcePackage: xorg-server
  UpgradeStatus: No upgrade log present (probably fresh install)

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