XLoadQueryFont() not returning with recent xserver master

[Jeremy Huddleston Sequoia]

Using current master plus the various patches I submitted to the list last night, I'm able to launch the server fairly reliably under ASan again, but some clients are getting wedged.  Most notably, xterm gets stuck waiting for a reply from XLoadQueryFont().  Looking at the state of the server threads, it looks fine.  It's processing other requests just fine from other clients.

Has anyone noticed anything odd like this or have some hunch as to where I might start looking other than to do yet another bisect? =/

  Thread 0x344e96           DispatchQueue 1           1000 samples (1-1000)     priority 31 (base 31)
  1000  start + 52 (xterm + 6312) [0x10d3bf8a8]
    1000  main + 3752 (xterm + 146228) [0x10d3e1b34]
      1000  spawnXTerm + 977 (xterm + 148776) [0x10d3e2528]
        1000  VTInit + 22 (xterm + 68248) [0x10d3cea98]
          1000  XtRealizeWidget + 135 (libXt.6.dylib + 84572) [0x10d4ffa5c]
            1000  RealizeWidget + 871 (libXt.6.dylib + 85805) [0x10d4fff2d]
              1000  RealizeWidget + 365 (libXt.6.dylib + 85299) [0x10d4ffd33]
                1000  VTRealize + 324 (xterm + 82404) [0x10d3d21e4]
                  1000  SetVTFont + 335 (xterm + 121728) [0x10d3dbb80]
                    1000  xtermLoadFont + 514 (xterm + 114081) [0x10d3d9da1]
                      1000  xtermOpenFont + 86 (xterm + 112342) [0x10d3d96d6]
                        1000  XLoadQueryFont + 311 (libX11.6.dylib + 29419) [0x10d54f2eb]
                          1000  _XQueryFont + 163 (libX11.6.dylib + 32127) [0x10d54fd7f]
                            1000  _XReply + 279 (libX11.6.dylib + 143484) [0x10d56b07c]
                              1000  xcb_wait_for_reply + 103 (libxcb.1.dylib + 8247) [0x10d711037]
                                1000  wait_for_reply + 251 (libxcb.1.dylib + 8521) [0x10d711149]
                                  1000  _xcb_conn_wait + 466 (libxcb.1.dylib + 4166) [0x10d710046]
                                    1000  _xcb_in_read + 1051 (libxcb.1.dylib + 12750) [0x10d7121ce]
                                      1000  __select + 10 (libsystem_kernel.dylib + 106318) [0x7fffc5e2df4e]
                                       *1000  _sleep_continue + 0 (kernel.development + 7459248) [0xffffff800091d1b0]


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