Xorg crashed with SIGABRT in <unavailable> in ??() (Nexus 7)

[Jean Lucas]

When using multi-touch features such as 4-finger dash open, system goes into intensive stress and after ~10 seconds crashes and restarts Xorg, ending up at GDM. Too much stress freezes input (mouse/touch).

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: xserver-xorg-core 2:1.13.2-0ubuntu2
Uname: Linux 3.1.10-9-nexus7 armv7l
.tmp.unity.support.test.0:

ApportVersion: 2.8-0ubuntu4
Architecture: armhf
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CrashCounter: 1
Date: Fri Feb 15 13:35:00 2013
DistUpgraded: Fresh install
DistroCodename: raring
DistroVariant: ubuntu
ExecutablePath: /usr/bin/Xorg
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:

InstallationDate: Installed on 2013-02-11 (4 days ago)
InstallationMedia: Ubuntu Raring Ringtail (development branch) - armhf (20130209-15:18)
Lspci:

Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MarkForUpload: True
ProcCmdline: /usr/bin/X :0 -core -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none
ProcEnviron:

ProcKernelCmdLine: tegra_wdt.heartbeat=30 tegraid=30.1.3.0.0 mem=1022M@2048M android.commchip=0 vmalloc=128M androidboot.serialno=015d24bc7d5c1006 video=tegrafb no_console_suspend=1 console=none debug_uartport=hsport usbcore.old_scheme_first=1 lp0_vec=8192@0xbddf9000 tegra_fbmem=8195200@0xabe01000 core_edp_mv=0 audio_codec=rt5640 board_info=f41:a00:1:44:2 tegraboot=sdmmc gpt gpt_sector=30535679 androidboot.bootloader=4.13 root=/dev/mmcblk0p9 ro console=tty0 access=m2 quiet splash
ProcModules: zram 8348 4 - Live 0xbf000000 (C)
Signal: 6
SourcePackage: xorg-server
StacktraceTop:
 ?? () from /lib/arm-linux-gnueabihf/libc.so.6
 raise () from /lib/arm-linux-gnueabihf/libc.so.6
 abort () from /lib/arm-linux-gnueabihf/libc.so.6
 OsAbort ()
 ddxGiveUp ()
Title: Xorg crashed with SIGABRT in raise()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

version.compiz: compiz 1:0.9.9~daily13.02.08-0ubuntu1
version.libdrm2: libdrm2 2.4.42-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.2-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.2-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.13.2-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.6-0ubuntu2
xserver.bootTime: Fri Feb 15 13:35:20 2013
xserver.configfile: None
xserver.devices:
 input gpio-keys KEYBOARD, id 6
 input elan-touchscreen TOUCHSCREEN, id 7
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs: Output HDMI-1 LVDS-1
xserver.version: 2:1.13.2-0ubuntu2
xserver.video_driver: tegra

[Apport retracing service (apport)]

Stacktrace:
 #0 <unavailable> in ?? ()
 PC not available
StacktraceSource: #0 <unavailable> in ?? ()
StacktraceTop: <unavailable> in ?? ()
ThreadStacktrace: PC not available

[Bryce Harrington (bryce)]

Unfortunately the stack trace is invalid - perhaps the crash is in the tegra driver and so symbols aren't being shown because it is proprietary closed source code.

The Xorg.0.log.old has one hint:

[ 1219.331] (WW) TEGRA(0): LVDS-1: Error querying display modes: No such device.
[ 1362.827] (WW) TEGRA(0): LVDS-1: Error querying display modes: No such device.
[ 1575.289] (EE)
[ 1575.291] (EE) Backtrace:
[ 1575.296] (EE)
[ 1575.296] (EE) Segmentation fault at address 0x70
[ 1575.298]
Fatal server error:
[ 1575.298] Caught signal 11 (Segmentation fault). Server aborting

Address 0x70 looks like an invalid pointer.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Bryce Harrington (bryce)]

Randomly touching nautilus with four fingers produced a spew of these to Xorg.0.log:

[ 136.919] (EE) BUG: triggered 'if (!(event->device_event.flags & (1 << 5)))'
[ 136.935] (EE) BUG: ../../dix/touch.c:628 in TouchConvertToPointerEvent()
[ 136.936] (EE) Non-emulating touch event
[ 136.937] (EE)

However, the X process isn't crashed or frozen.

Apart from that, I'm not reproducing the crash so far. I'll keep trying for a bit.

Meantime, if anyone else can reproduce the crash, please collect a backtrace manually, or shoot me a core dump.

[Bryce Harrington (bryce)]

That message correlates to this code.

    BUG_WARN_MSG(!(event->device_event.flags & TOUCH_POINTER_EMULATED),
                 "Non-emulating touch event\n");

Not sure what it implies but seems to be "just" a warning.

Other than that, 4-finger tap appears to work fine for me. Any other suggestions for reproducing with the current code?

[bugbot (bugbot)]

We're closing this bug since there has not been a response from the original reporter. However, the issue still exists please feel free to reopen with the requested information. If you're not the original reporter, we'd prefer you file a new bug report.

Some tips:

  * Report X.org bugs via the command: `ubuntu-bug xorg`

  * Test against the latest development Ubuntu. http://cdimage.ubuntu.com/daily-live/
    Bugs marked as affecting the development version tend to get priority attention.

  * The `xdiagnose` utility has functionality for enabling debugging and
    analyzing a few common X problems.

  * Tag your bugs with the Ubuntu versions you have reproduced the issue in.

  * See https://wiki.ubuntu.com/X/Reporting for tips on writing good bug reports.