Repro (intermittent):  
$ xrandr -q
zsh: segmentation fault (core dumped)  xrandr -q

When xrandr does not crash, it variously returns one of  two results
(note the difference for second screen, DisplayPort-0):

$ xrandr -q                           
Screen 0: minimum 320 x 200, current 4480 x 1440, maximum 16384 x 16384
LVDS connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 
194mm
   1920x1080      60.2*+   40.1  
   1680x1050      60.0  
   1400x1050      60.0  
   1280x1024      59.9  
   1440x900       59.9  
   1280x960       59.9  
   1280x854       59.9  
   1280x800       59.8  
   1280x720       59.9  
   1152x768       59.8  
   1024x768       59.9  
   800x600        59.9  
   848x480        59.7  
   720x480        59.7  
   640x480        59.4  
DisplayPort-0 connected 2560x1440+1920+0 (normal left inverted right x axis y 
axis) 0mm x 0mm
   1024x768       60.0  
   800x600        60.3     56.2  
   848x480        60.0  
   640x480        59.9  
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)
  2560x1440 (0x2e2)  241.5MHz
        h: width  2560 start 2608 end 2640 total 2720 skew    0 clock   88.8KHz
        v: height 1440 start 1443 end 1448 total 1481           clock   60.0Hz

$ xrandr -q  
Screen 0: minimum 320 x 200, current 4480 x 1440, maximum 16384 x 16384
LVDS connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 
194mm
   1920x1080      60.2*+   40.1  
   1680x1050      60.0  
   1400x1050      60.0  
   1280x1024      59.9  
   1440x900       59.9  
   1280x960       59.9  
   1280x854       59.9  
   1280x800       59.8  
   1280x720       59.9  
   1152x768       59.8  
   1024x768       59.9  
   800x600        59.9  
   848x480        59.7  
   720x480        59.7  
   640x480        59.4  
DisplayPort-0 connected 2560x1440+1920+0 (normal left inverted right x axis y 
axis) 597mm x 336mm
   2560x1440      60.0*+
   1920x1200      59.9  
   1920x1080      60.0     60.0     50.0     59.9     24.0     24.0  
   1920x1080i     60.1     50.0     60.0  
   1600x1200      60.0  
   1680x1050      60.0  
   1280x1024      75.0     60.0  
   1280x800       59.8  
   1152x864       75.0  
   1280x720       60.0     50.0     59.9  
   1440x576i      50.1  
   1024x768       75.1     60.0  
   1440x480i      60.1     60.1  
   800x600        75.0     60.3  
   720x576        50.0  
   720x480        60.0     59.9  
   640x480        75.0     60.0     59.9  
   720x400        70.1  
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)

$ uname -a
Linux Ubu14Msw4-M4800 3.13.0-39-generic #66-Ubuntu SMP Tue Oct 28 13:30:27 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux
Ubuntu 14.04.1 LTS

$ dmesg | tail
[  226.671770] xrandr[2361]: segfault at 38 ip 00000000004027ae sp 
00007fff63eb7e60 error 4 in xrandr[400000+d000]
[ 1566.312068] [drm:si_dpm_set_power_state] *ERROR* si_set_sw_state failed
[ 1978.902140] xrandr[4990]: segfault at 38 ip 0000000000402829 sp 
00007fff51114720 error 4 in xrandr[400000+d000]
[ 2206.271566] xrandr[5890]: segfault at 38 ip 0000000000402829 sp 
00007fff2af7c580 error 4 in xrandr[400000+d000]
[ 2568.830335] xrandr[6049]: segfault at 38 ip 0000000000402829 sp 
00007fffd3919610 error 4 in xrandr[400000+d000]
[ 2572.286594] xrandr[6054]: segfault at 38 ip 0000000000402829 sp 
00007fffae5b4460 error 4 in xrandr[400000+d000]
[ 2580.897760] xrandr[6067]: segfault at 10 ip 0000000000402ee6 sp 
00007fff96869490 error 4 in xrandr[400000+d000]
[ 2587.574203] xrandr[6094]: segfault at 38 ip 0000000000402829 sp 
00007fff29572620 error 4 in xrandr[400000+d000]
[ 3001.398366] xrandr[6462]: segfault at 38 ip 0000000000402829 sp 
00007fff5dc471f0 error 4 in xrandr[400000+d000]
[ 3109.594677] xrandr[6565]: segfault at 38 ip 0000000000402829 sp 
00007fff534df710 error 4 in xrandr[400000+d000]

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to x11-xserver-utils in Ubuntu.
https://bugs.launchpad.net/bugs/1340716

Title:
  segfault at 8 ip 08051738 sp bf97f4e0 error 4 in xrandr[8048000+c000]

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