Bug#575905: backtrace of xvfb segfault

["Bernhard R. Link" <brlink@debian.org>]

The following backtrace is from
it://anongit.freedesktop.org/xorg/xserver compiled on lenny
(and on i386 and not sid on sparc as my original report),
but I hope it is the same bug:

(gdb) bt full
#0  0xf7cd83b3 in strlen () from /lib/i686/cmov/libc.so.6
No symbol table info available.
#1  0x080b5b7a in SizeDeviceInfo (dev=0x81b0f68) at xiquerydevice.c:204
No locals.
#2  0x080b5d4d in ProcXIQueryDevice (client=0x819bcf0) at xiquerydevice.c:98
        rep = {repType = 0 '\0', RepType = 16 '\020', sequenceNumber = 0, length = 0, 
  num_devices = 0, pad0 = 0, pad1 = 0, pad2 = 135998160, pad3 = 5, pad4 = 8, pad5 = 1}
        dev = (DeviceIntPtr) 0x81b0f68
        rc = <value optimized out>
        i = 5
        len = 2428
        info = <value optimized out>
        skip = (Bool *) 0x819e160
#3  0x080aa543 in ProcIDispatch (client=0x819bed8) at extinit.c:418
No locals.
#4  0x08100aed in Dispatch () at dispatch.c:439
        result = <value optimized out>
        client = (ClientPtr) 0x819bcf0
        nready = 0
        start_tick = 420
#5  0x080ef9fd in main (argc=2, argv=0xffffb064, envp=Cannot access memory at address 0x8
) at main.c:286
        i = 1
        alwaysCheckForInput = {0, 1}

And the dev of frame 1 is:
$3 = {public = {devicePrivate = 0x0, processInputProc = 0x80bd350 <ProcessOtherEvent>, 
    realInputProc = 0x80bd350 <ProcessOtherEvent>, 
    enqueueInputProc = 0x810fe60 <EnqueueEvent>, on = 1}, next = 0x81b1220, startup = 1, 
  deviceProc = 0x8064f20 <vfbMouseProc>, inited = 1, enabled = 1, coreEvents = 1, 
  deviceGrab = {grabTime = {months = 0, milliseconds = 507943791}, fromPassiveGrab = 0, 
    implicitGrab = 0, activeGrab = {next = 0x0, resource = 0, device = 0x0, window = 0x0, 
      ownerEvents = 0, keyboardMode = 0, pointerMode = 0, grabtype = GRABTYPE_CORE, 
      type = 0 '\0', modifiersDetail = {exact = 0, pMask = 0x0}, modifierDevice = 0x0, 
      detail = {exact = 0, pMask = 0x0}, confineTo = 0x0, cursor = 0x0, eventMask = 0, 
      deviceMask = 0, xi2mask = {"\000\000" <repeats 42 times>}}, grab = 0x0, 
    activatingKey = 0 '\0', ActivateGrab = 0x810fa70 <ActivateKeyboardGrab>, 
    DeactivateGrab = 0x810f7f0 <DeactivateKeyboardGrab>, sync = {frozen = 0, state = 0, 
      other = 0x0, event = 0x0}}, type = 0, xinput_type = 0, name = 0x0, id = 6, 
  key = 0x0, valuator = 0x81b1a60, button = 0x81b1508, focus = 0x0, proximity = 0x0, 
  absolute = 0x0, kbdfeed = 0x0, ptrfeed = 0x81b2a80, intfeed = 0x0, stringfeed = 0x0, 
  bell = 0x0, leds = 0x0, xkb_interest = 0x0, config_info = 0x0, devPrivates = 0x81b26e8, 
  nPrivates = 0, unwrapProc = 0, spriteInfo = 0x81b1210, u = {master = 0x81c2cd0, 
    lastSlave = 0x81c2cd0}, last = {valuators = {0 <repeats 36 times>}, remainder = {
      0 <repeats 36 times>}, numValuators = 2, slave = 0x0}, properties = {
    properties = 0x81b2a38, handlers = 0x81b2a68}}

I.e. it is trying strlen on dev.name which is NULL.

Hope that helps,
	Bernhard R. Link