Xorg crashed with SIGSEGV in GetClientsForDelivery()

[matanya]

ProblemType: Crash
Date: Thu Jun 21 12:41:58 2012
DistroRelease: Ubuntu 12.04
ExecutablePath: /usr/bin/Xorg
ExecutableTimestamp: 1336434722
ProcCmdline: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none
ProcCwd: /etc/X11

SegvAnalysis:Segfault happened at: 0x7f48b182e558 <GetClientsForDelivery+152>: mov 0xc0(%rsi),%rax
PC (0x7f48b182e558) ok
source "0xc0(%rsi)" (0x000000c0) not located in a known VMA region (needed readable region)!
destination "%rax" ok

SegvReason:reading NULL VMA

stacktrace:#0 GetClientsForDelivery (clients=0x7fff45732708, filter=64, events=0x7f48b25e25b0, win=0x0, dev=0x7f48b2bb0e00) at ../../dix/events.c:2107
        inputMasks = <optimized out>
#1 GetClientsForDelivery (dev=0x7f48b2bb0e00, dev@entry=<error reading variable: Cannot access memory at address 0x7fff45732608>, win=0x0, events=0x7f48b25e25b0, filter=64, clients=<optimized out>) at ../../dix/events.c:2098
        rc = 0
StacktraceTop:
GetClientsForDelivery (clients=0x7fff45732708, filter=64, events=0x7f48b25e25b0, win=0x0, dev=0x7f48b2bb0e00) at ../../dix/events.c:2107
GetClientsForDelivery (dev=0x7f48b2bb0e00, dev@entry=<error reading variable: Cannot access memory at address 0x7fff45732608>, win=0x0, events=0x7f48b25e25b0, filter=64, clients=<optimized out>) at ../../dix/events.c:2098

[matanya (matmo)]

ThreadStacktrace:
Thread 1 (Thread 0x7f48b17ad880 (LWP 1169)):
#0 GetClientsForDelivery (clients=0x7fff45732708, filter=64, events=0x7f48b25e25b0, win=0x0, dev=0x7f48b2bb0e00) at ../../dix/events.c:2107
        inputMasks = <optimized out>
#1 GetClientsForDelivery (dev=0x7f48b2bb0e00, win=0x0, events=0x7f48b25e25b0, filter=64, clients=<optimized out>) at ../../dix/events.c:2098
        rc = 0

Linux 3.2.0-25-generic x86_64

xserver-xorg-core 2:1.11.4-0ubuntu10.2

[matanya (matmo)]

 Backtrace:
 [ 24212.636] 0: /usr/bin/X (xorg_backtrace+0x26) [0x7fb0d91aa866]
 [ 24212.636] 1: /usr/bin/X (0x7fb0d9022000+0x18c70a) [0x7fb0d91ae70a]
 [ 24212.636] 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7fb0d8348000+0xfcb0) [0x7fb0d8357cb0]
 [ 24212.636] 3: /usr/bin/X (0x7fb0d9022000+0x55558) [0x7fb0d9077558]
 [ 24212.636] 4: /usr/bin/X (DeliverRawEvent+0xad) [0x7fb0d907f5ed]
 [ 24212.636] 5: /usr/bin/X (0x7fb0d9022000+0x11efe9) [0x7fb0d9140fe9]
 [ 24212.636] 6: /usr/bin/X (0x7fb0d9022000+0x149eb1) [0x7fb0d916beb1]
 [ 24212.636] 7: /usr/bin/X (mieqProcessDeviceEvent+0x1e1) [0x7fb0d918b391]
 [ 24212.636] 8: /usr/bin/X (0x7fb0d9022000+0x4620d) [0x7fb0d906820d]
 [ 24212.636] 9: /usr/bin/X (DisableDevice+0x88) [0x7fb0d9069908]
 [ 24212.636] 10: /usr/bin/X (RemoveDevice+0x218) [0x7fb0d9069d48]
 [ 24212.636] 11: /usr/bin/X (DeleteInputDeviceRequest+0x41) [0x7fb0d90c1dc1]
 [ 24212.636] 12: /usr/bin/X (0x7fb0d9022000+0x43d5c) [0x7fb0d9065d5c]
 [ 24212.636] 13: /usr/bin/X (0x7fb0d9022000+0x44301) [0x7fb0d9066301]
 [ 24212.636] 14: /usr/bin/X (0x7fb0d9022000+0x3d71c) [0x7fb0d905f71c]
 [ 24212.636] 15: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xed) [0x7fb0d71dd76d]
 [ 24212.636] 16: /usr/bin/X (0x7fb0d9022000+0x3d99d) [0x7fb0d905f99d]
 [ 24212.636] Segmentation fault at address 0xc0
 [ 24212.636]
 Caught signal 11 (Segmentation fault). Server aborting