(gdb) fr 1
#1  0x0806ced5 in _IL_GCHandle_GCValidate (_thread=0x816ff80, handle=82) at lib_gc.c:375
375             table = GetGCHandleTable(_thread);
(gdb) print* _thread
$1 = {process = 0x0, nextThread = 0x0, prevThread = 0x0, supportThread = 0x0, stackBase = 0x0, stackLimit = 0x0, pc = 0x0,
  exceptHeight = 0x0, frame = 0x0, stackTop = 0x0, method = 0x404ee858, thrownException = 0x0, aborting = 0,
  managedSafePointFlags = 0, clrThread = 0x0, isFinalizerThread = 0, freeMonitor = 0x0, freeMonitorCount = 0,
  frameStack = 0x0, numFrames = 0, maxFrames = 0, threadStaticSlots = 0x0, threadStaticSlotsUsed = 0,
  runningManagedCode = 0, currentException = 0x0, threadAbortException = 0x0, abortHandlerEndPC = 0x0,
  abortHandlerFrame = 0, prevContext = 0x0}
(gdb)