I finally managed to get a core dump and a better stacktrace: (gdb) bt full #0 XIGetDeviceProperty (dev=0x7f962cfb5760, property=<optimized out>, value=0x7fff8ba11458) at ../../Xi/xiproperty.c:852 handler = <optimized out> prop = 0x7f962cfba920 rc = <optimized out> #1 0x00007f962b69f422 in get_property (dev=<optimized out>, property=304, type=19, offset=<optimized out>, length=<optimized out>, bytes_after=0x7fff8ba11528, type_return=0x7fff8ba1152c, format=0x7fff8ba11520, nitems=0x7fff8ba11524, length_return=0x7fff8ba1151c, data=0x7fff8ba11510, delete=<optimized out>, client=<optimized out>) at ../../Xi/xiproperty.c:290 n = <optimized out> len = <optimized out> ind = <optimized out> rc = <optimized out> prop = <optimized out> prop_value = <optimized out> #2 0x00007f962b69fa2a in get_property (data=0x7fff8ba11510, length_return=0x7fff8ba1151c, nitems=0x7fff8ba11524, format=0x7fff8ba11520, type_return=0x7fff8ba1152c, bytes_after=0x7fff8ba11528, length=1, offset=0, delete=0 '\000', type=19, property=304, dev=0x7f962cfb5760, client=<optimized out>) at ../../Xi/xiproperty.c:272 No locals. #3 ProcXGetDeviceProperty (client=0x7f962d488420) at ../../Xi/xiproperty.c:991 stuff = 0x7f962d488800 dev = 0x7f962cfb5760 length = <optimized out> rc = <optimized out> format = <optimized out> nitems = <optimized out> bytes_after = <optimized out> data = <optimized out> type = <optimized out> reply = {repType = 200 '\310', RepType = 141 '\215', sequenceNumber = 11159, length = 32662, propertyType = 727490564, bytesAfter = 32662, nItems = 731368368, format = 150 '\226', deviceid = 127 '\177', pad1 = 0, pad2 = 731352512, pad3 = 32662} #4 0x00007f962b5c58a1 in Dispatch () at ../../dix/dispatch.c:442 clientReady = 0x7f962cee9470 result = <optimized out> client = 0x7f962d488420 nready = 0 icheck = 0x7f962b97cbd0 start_tick = 117780 #5 0x00007f962b5b47ba in main (argc=9, argv=<optimized out>, envp=<optimized out>) at ../../dix/main.c:287 i = <optimized out> alwaysCheckForInput = {0, 1} (gdb)
The device in question seems to be the touchpad: (gdb) p dev->name $1 = 0x7f962cfb64b0 "SynPS/2 Synaptics TouchPad" (gdb) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1026777 Title: Xorg segfault: kicks out to login screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1026777/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs