Created attachment 91355 [details] the wireshark caputred packet when run above python code import xcb from xcb import randr con = xcb.connect() ran = con(randr.key) ver = ran.QueryVersion(1, 3).reply() root = con.get_setup().roots[0].root ran.GetScreenInfo(root).reply() this will panic: Traceback (most recent call last): File "a.py", line 11, in <module> ran.GetScreenInfo(root).reply() File "/usr/lib/python2.7/dist-packages/xcb/randr.py", line 101, in __init__ self.rates = xcb.List(parent, offset, (self.nInfo - self.nSizes), RefreshRates, -1) File "/usr/lib/python2.7/dist-packages/xcb/randr.py", line 56, in __init__ (self.nRates,) = unpack_from('H', parent, offset) struct.error: unpack_from requires a buffer of at least 2 bytes because the xserver reply an malformed package, seems caused by this commit https://bugs.freedesktop.org/show_bug.cgi?id=21861#c4
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